Chicago, IL

Weather Forecast Office

August 10, 2020: Corn Belt Derecho

On August 10, 2020, a large and intense line of thunderstorms known as a "derecho" swept across much of the Midwest, producing wind damage to an area larger than 90,000 square miles. The derecho resulted in $11.5B worth of damage, making it the COSTLIEST known thunderstorm event in modern U.S. history. Peak wind gusts topped 140 mph in Cedar Rapids, Iowa, and at least 26 tornadoes were spawned by the storm. More than 20,000,000 people lived in the damage footprint of the derecho, with at least 1,000,000 customers losing power -- some for more than two weeks. Numerous injuries were counted after the storm, and four people lost their lives.

In the NWS Chicago County Warning Area (CWA), over 160 reports of damaging winds were received and 15 tornadoes were confirmed, including an EF-1 tornado in the Rogers Park community area of Chicago. The derecho stands as one of the most impactful weather events to ever impact the NWS Chicago County Warning Area.

August 10, 2020, Midwest Derecho Story Map

Fast Facts
Storm Reports
Tornadoes
Radar
Photos
Environment
Rainfall
NWS Office Recaps

Fast Facts:

Summary: A well-organized and long-lived complex of storms produced widespread severe wind damage across Iowa, northern Illinois, and northern Indiana during the daytime on Monday, August 10, 2020. Much of this severe wind was significant (75+ mph winds), resulting in many downed trees, several toppled-over semi trucks, and many communities receiving at least some minor structural damage. Within the broader area of severe winds, 15 tornadoes were confirmed across northern Illinois and northwest Indiana.
- Several tornadic circulations developed within the main line of thunderstorms, and these accounted for 13 tornadoes across northern Illinois and northwest Indiana. In addition, a lone supercell that was subsequently absorbed into the main line produced 2 tornadoes in and around the Rockford area, bringing the total number of tornadoes for this event to 15. As of 2025, these 15 tornadoes are a record for a single calendar day in the month of August in the NWS Chicago County Warning Area.
August 10th by the numbers:
- Over 700 reports of severe wind speeds (58+ mph) or wind damage were received from the Nebraska/Iowa border, across Iowa, through northern Illinois, and into northern Indiana. This was a high end, once-a-decade type of event for the area.
- Over 160 of the wind reports were from northern Illinois and northwest Indiana.
- 12 injuries were reported in the NWS Chicago CWA: 5 occurred in Forreston, IL, 1 in Peru, IL, 3 in Matthiessen State Park near Utica, IL, 1 in Lake Villa, IL, 1 in Lake Station, IN, and 1 in Hammond, IN.
- 15 tornadoes were confirmed in the NWS Chicago County Warning Area, which includes portions of northern Illinois and northwest Indiana.
- In total, the derecho produced 26 confirmed tornadoes across Iowa, Illinois, Wisconsin, and Indiana.
- The tornadoes included an EF-1 tornado in Rogers Park (a north-side community area of Chicago) that moved out over Lake Michigan and became a waterspout. This was the first tornado to occur in the city of Chicago since September 3, 2018 (EF-0) and was also the first F-1/EF-1+ tornado in the city of Chicago since an F-2 tornado on March 12, 1976 that clipped the far northwest side of the city, roughly near O'Hare Airport and Edison Park.
Derecho Facts: This complex of storms was known as a derecho.
- A derecho produces a swath of particularly damaging thunderstorm winds (specifically, wind gusts of at least 58 mph along most of its length with several well-separated 75 mph or greater gusts) over an area at least 250 miles long.
- The winds produced by derechos are primarily classified as straight-line winds rather than tornadic.
- Even so, wind speeds in a derecho can exceed 100 mph, which is equivalent to that of an EF-1 tornado but over a vastly larger area than a tornado would impact.
- Tornadoes can also be embedded within derechos and produce concentrated areas of even more intense damage.
- Derechos develop in environments with very warm and moist air at the surface, relatively cooler air aloft, and moderate to strong winds in the upper levels of the troposphere.
- Northern Illinois and northern Indiana have long been known as a corridor of enhanced derecho activity, as shown in the below graphic on the right from a published paper by Guastini & Bosart (2016) titled "Analysis of a Progressive Derecho Climatology and Associated Formation Environments".


Q&A on derechos	Understanding a damaging wind thunderstorm complex	Derecho climatology from 1996-2013 by Guastini and Bosart (2016).

Preparedness: Despite the massive coverage and impressive intensity of the wind damage, there were a limited number of serious injuries. This speaks to the effort of our partners, including fellow meteorologists in the weather enterprise, effectively communicating the threats and action needed to be taken, as well as emergency management and law enforcement for their preparedness efforts beforehand and assistance efforts immediately after. Of course, it also means that many public citizens heeded the threat and the warnings, and communicated them to their family and friends (being a "Force of Nature!"). For more on severe weather preparedness, see here.
The Forecast: Forecast confidence increased markedly Monday morning that severe weather was likely across northern Illinois and northwest Indiana that afternoon. At NWS Chicago, our messaging accordingly increased, and we issued a Situation Report (briefing) for our partners at 9:15 a.m. and held a conference call with them around 12 p.m. The office also issued eight Severe Thunderstorm Warnings and six Tornado Warnings as the derecho moved through the area. Here are some of the forecast products and information put out by the NWS Storm Prediction Center (SPC) and NWS Chicago on the day of the derecho:


SPC Day 1 Severe Thunderstorm Outlook issued at 7:16 a.m., Aug. 10.	NWS Chicago Weather Story graphic issued at 9:00 a.m., Aug. 10.	SPC Day 1 Severe Thunderstorm Outlook issued at 10:57 a.m., Aug. 10.	NWS Chicago Weather Story graphic issued at 11:15 a.m., Aug. 10.
More on the severe weather outlook categories can be found here.


Severe Thunderstorm Watch issued at 11:25 a.m., Aug 10 through 7 p.m. This was a rarely issued Particularly Dangerous Situation Severe Thunderstorm Watch due to the likelihood of widespread significant wind damage.	NWS Chicago Weather Story graphic illustrating forecast timing of severe winds, issued at 12:00 p.m. Aug. 10.

Storm Reports


Regional Storm Reports			Local Storm Reports
For interactive maps of storm reports, visit this web page.

In the NWS Chicago County Warning Area, over 160 reports of damaging winds were received and 15 tornadoes were confirmed, including an EF-1 tornado in the Rogers Park community area of Chicago. Click on the links below for quality-controlled reports of damage produced by the derecho:

Illinois Counties

Winnebago, Boone, McHenry, Lake, Ogle, Lee, DeKalb, Kane, DuPage, Cook, La Salle, Grundy, Kendall, Will, Kankakee, Livingston, Ford, and Iroquois

Northwest Indiana Counties

Lake, Porter, Newton, Jasper, and Benton

Tornadoes:

A total of 15 tornadoes were confirmed across northern Illinois and northwest Indiana in the NWS Chicago County Warning Area.

Full Public Information Statement on the tornadoes

Downloadable KMZ file featuring all tornado paths and wind swaths/damage

Downloadable shapefile featuring all tornado paths and wind swaths/damage

Tornadoes are listed in chronological order:

Tornado #1: Southwest Rockford, IL EF-0
WINNEBAGO COUNTY

Track Map

EF-Scale

Downloadable KMZ file

Downloadable shapefile

Summary:

A very brief tornado touched down near the intersection of Pierpont Ave. and Montague Road and continued northeast through the southwest side of Rockford. The tornado ended near the intersection of Ferguson and Loomis Streets. All damage was to trees along the tornado path.

Tornado #2 - Rockford to Caledonia, IL EF-1
WINNEBAGO/BOONE COUNTY

Track Map

EF-Scale

Downloadable KMZ file

Downloadable shapefile

Summary:

This tornado was associated with the same supercell thunderstorm that produced an initial brief EF-0 tornado on the southwest side of Rockford, but it has been determined these exist as two separate tracks. This tornado developed as the main line of thunderstorms caught up, and eventually merged with, the parent supercell with this path starting near Guilford Road just north of Rockford College before heading northeast. Significant tree damage, consistent with EF-1 wind speeds, occurred in a localized area immediately east of Rock Valley College west of North Perryville Road. The tornado continued northeast, crossing I-90/39, producing sporadic damage before lifting near Caledonia Road.

Tornado #3 - Kirkland, IL EF-0
DEKALB COUNTY

Kirkland Tornado

EF-Scale

Downloadable KMZ file

Downloadable shapefile

Summary:

Drone footage shared with NWS Chicago, as well as satellite imagery, revealed a narrow swath of corn flattened in a convergent pattern. This tornado crossed Buck Road and Pearl Street before lifting in a field east of Myelle Road.

Tornado #4 - Ottawa, IL EF-1
LASALLE COUNTY

Track Map

EF-Scale

Downloadable KMZ file

Downloadable shapefile

Summary:

The tornado started south of Marquette Street west of Michigan Street and progressed eastward. The tornado impacted several businesses, ripping off well-anchored roofing material and snapping a power pole at its base. It was here that the max intensity of the tornado was reached, with peak winds of around 100 mph. The tornado then continued eastward, ripping shingles off roofs of buildings and houses just west of Route 23 and shredding trees. The tornado is believed to have lifted in an inaccessible forested area east of the Fox River. Eyewitnesses indicated the tornado may have had multiple vortices with clear rising and rotating motion of debris.

Tornado #5 - Southeast Marengo, IL EF-1
MCHENRY COUNTY

Track Map

EF-Scale

Downloadable KMZ file

Downloadable shapefile

Summary:

This EF-1 tornado started on Harmony Road immediately southwest of I-90 near the McHenry/DeKalb County line. Tree damage consistent with winds around 95 mph occurred immediately northeast of I-90. The tornado heavily damaged a single family home near Maple Street before heading northeast and lifting near Coral and Dunham Roads.

Tornado #6 - Northwest Elburn, IL EF-1
KANE COUNTY

Track Map

EF-Scale

Downloadable KMZ file

Downloadable shapefile

Summary:

Drone footage shared with NWS Chicago revealed a narrow swath of corn flattened in a convergent pattern. In addition, damage to a barn was noted, with a near complete removal of the gabled roof. This damage is consistent with a tornado with winds of EF-1 intensity.

Tornado #7 - Yorkville to South Plainfield EF-1
KENDALL/WILL COUNTY

Track Map

EF-Scale

Zoomed-in Maps

Downloadable KMZ file

Downloadable shapefile

Summary:

The tornado started on the far south side of Yorkville near Walsh Drive, where a pergola was destroyed, siding was ripped off a house, and parts of a fence and a tree were thrown over a roadway. Eyewitness accounts indicate the debris was lifted and twirled, consistent with a tornado. The tornado then progressed east-southeastward, producing damage to trees along State Route 126 toward Schlapp Road. The most significant damage was found east of Schlapp Road along Wheeler road, where trees were mangled, a farm building was destroyed with debris deposited in a nearby field, and a large grain bin was bent inward. Wood panels were thrown into the ground, leaving scour marks in the grass. Six power poles were snapped along Ridge Road, and a 1000-1500 lb auger was moved about 50 feet. This is where the tornado likely reached peak intensity with winds near 105 mph. The tornado continued southeast into neighborhoods south of Renwick Road, producing mainly tree damage, and ended just before I-55. A swath of damaging winds consistent with speeds of 70 to 80 mph continued into Crest Hill based on prolific tree damage.

Tornado #8 - Wheaton, IL EF-1
DUPAGE COUNTY

Track Map

EF-Scale

Downloadable KMZ file

Downloadable shapefile

Summary:

A very brief tornado touched down near the intersection of Seminary Avenue and Scott Street before moving northeast, where it toppled a roughly 50 foot tall steeple on the north side of the College Church in Wheaton. The tornado then produced minor tree damage before lifting near College Avenue and Howard Street.

Tornado #9 - Lombard/Villa Park, IL EF-1
DUPAGE COUNTY

Track Map

EF-Scale

Downloadable KMZ file

Downloadable shapefile

Summary:

The same storm which produced the brief Wheaton tornado produced another region of tornado damage immediately east of I-355 just east of Lilacia Park in Lombard. This tornado also continued in a northeasterly direction, uprooting trees -- some snapped at the trunk, and causing damage to some houses -- a few of which sustained substantial roof damage. The worst damage occurred near and around the Lombard Common just south of St. Charles Road. Damage eased considerably on the north side of the circulation, with a more gradual drop off in damage to its south. The tornado lifted just northeast of the Jefferson Middle School.

Tornado #10 - Spring Grove, IL to Camp Lake, WI EF-1
LAKE COUNTY

Track Map

EF-Scale

Downloadable KMZ file

Downloadable shapefile

Summary:

This tornado started in northwest Lake County, continued into Wisconsin and through Camp Lake, and appeared to dissipate over the lake in NWS Milwaukee's area of responsibility. Mainly tree damage occurred, with the most significant structural damage occurring in northwestern Lake County.

Tornado #11 - Oak Forest to Midlothian, IL EF-1
COOK COUNTY

Track Map

EF-Scale

Downloadable KMZ file

Downloadable shapefile

Summary:

A tornado touched down just east of South Harlem Avenue in Oak Forest, then moved nearly due east along 151st Street, producing mainly minor tree and structural damage before lifting near the I-57/I-294 interchange in Midlothian. The worst and most concentrated damage then occurred near Midlothian in the region between Cicero Avenue and Pulaski Road. Several large trees and power poles were snapped near their bases in this region, producing damage consistent with an EF-1 tornado. Damage felled consistently in a convergent pattern towards the track centerline. The tornado damage then began to transition to a region of enhanced straight-line winds near the I-57/294 interchange, where the damage became increasingly oriented in an easterly direction. Downed utility poles and snapped trees indicate wind speeds were likely near 90 mph, with the most notable damage centered in and around the Harvey area bounded on the north by Sibley Boulevard and the south by 159th Street. This high degree of wind damage persisted east into the Shabbona Woods Forest Preserve before easing towards Calumet City.

Tornado #12 - Park Forest, IL EF-0
COOK COUNTY

Track Map

EF-Scale

Downloadable KMZ file

Downloadable shapefile

Summary:

A brief tornado touched down very close to the Cook/Will county line near Shabbona Drive. It tracked northeast, where it produced a localized area of tree damage consistent with high-end EF-0 wind speeds. The worst damage was confined to a small area near Marquette and Somonauk Parks, although very little structural damage was noted in this area. The tornado lifted over Schubert's Woods Forest Preserve. Sporadic straight-line wind damage continued east towards State Street east of South Chicago Heights.

Tornado #13 - Lincolnwood to Rogers Park - Chicago, IL EF-1
COOK COUNTY

Track Map

EF-Scale

Downloadable KMZ file

Downloadable shapefile

Summary:

This tornado initially touched down south of the intersection of Crawford and Touhy Avenues in the suburb of Lincolnwood. It then continued moving just north of due east before moving offshore near the Jarvis and Fargo beaches. The most intense damage, consistent with that of a high-end EF-1 tornado, occurred within approximately one mile of the lakefront, as well as near and within Phillip Rogers Park.

Tornado #14 - Grant Park, IL
KANKAKEE COUNTY

Track Map

EF-Scale

Downloadable KMZ file

Downloadable shapefile

Summary:

An EF-0 tornado touched down just northwest of Grant Park along N 11000 E Road and traveled southeast through Grant Park. Considerable tree damage was found along the path. The tornado ended near Lake Metonga.

Tornado #15 - Kentland, IN Area
NEWTON COUNTY

Track Map

EF-Scale

Downloadable KMZ file

Downloadable shapefile

Summary:

This brief EF-0 tornado was on the ground for less than 1 minute and produced minor damage to a metal farm building immediately west of State Highway 41.

The Enhanced Fujita (EF) Scale classifies tornadoes into the following categories:

EF0 Weak 65-85 mph	EF1 Moderate 86-110 mph	EF2 Significant 111-135 mph	EF3 Severe 136-165 mph	EF4 Extreme 166-200 mph	EF5 Catastrophic 200+ mph

Radar:

Loops


Composite radar (highest intensity within the column) of the derecho across northern Illinois courtesy of NWS Milwaukee.	Lowest level radar scans of the derecho across northern Illinois.

Storm-Relative Velocity from KLOT between 3:13 and 3:36 PM CDT with circulation tracks circled and overlaid. The circulations embedded within the line were responsible for the "fingers" of damage across the Chicago Area, within which brief tornadoes were common.

Photos:

Approaching Derecho


Shelf cloud 2 miles west of Mendota, IL courtesy of Heather Friedlein	Shelf cloud near Lisle, IL courtesy of Keith Langosch	Shelf cloud from near Sugar Grove, IL courtesy of Maddie Murphy.

Tornadoes

Ottawa, IL tornado courtesy of Jason Ward.

Storm Damage


Kendall County to Will County tornado - NWS Survey	Kendall County to Will County tornado - NWS Survey	Kendall County to Will County tornado - NWS Survey	Kendall County to Will County tornado - NWS Survey


Elburn, IL, courtesy of Matt Taylor	Midlothian, IL, courtesy of Matt Kooi


Ottawa, IL courtesy of Matthew Spika	Ottawa, IL courtesy of Gilbert Sebenste	Wheaton, IL church steeple damage courtesy of Carrie Vicek-Jodelka


Somonauk, IL courtesy of Bob Waszak	Chicago, Albany Park community area, courtesy of Alex Forgue	Chicago, Rogers Park community area, courtesy of Paul Navarro	Chicago, Dunning community area, courtesy of Twitter follower @Jasong1451


New Lenox, IL courtesy of the Joliet Weather Center	New Lenox, IL courtesy of Dan Casper	Dwight, IL courtesy of Andrew Pritchard

Environment

Aug 10, 9 a.m. 500 mb (~18,000 ft) level, showing a strong short wave and associated 50-70 kt speed maximum moving eastward across the Upper Midwest. This would be a driving force for continued upper support through the thunderstorm complex's lifecycle.

Aug 10, 9 a.m. surface weather map highlighting the very moist air mass ahead of the maturing thunderstorm complex at that time. Note the warm front also slowly moving north. This boundary supported continued low-level warm and moist advection (fuel to the storms), as well as a source for low-level veering profiles near it increasing tornadogenesis potential especially in the toward the IL/WI state line by mid afternoon.

NWS Quad Cities weather balloon launch at 12 p.m. on August 10 that sampled a high amount of instability thanks to exceptionally steep mid-level lapse rates and very high equilibrium levels, ample moisture, and undirectional mid-level flow of sufficient amount for long-lived, organized, forward-propagating storms.


Aug 10, 11 a.m. deep layer wind shear, with values of 40+ kt sufficient for storm organization, and given the unidirectional mid-level wind profile, this also would help support the development of a forward-propagating storm complex.	Aug 10, 11 a.m. surface-based CAPE (instability), with widespread values over 2,500 J/kg indicating a strongly unstable air mass ahead of the incoming thunderstorm complex.	Aug 10, 11 a.m. precipitable water, with an ample moisture reservoir present for the replenishing of moisture into the thunderstorm complex.


Aug 10, 11 a.m. mid-level lapse rates with 8C/km or higher through that layer reflecting the potential for rapidly accelerating updrafts. Combined with sufficient low-level moisture and heating, this indicates explosive convection processes.	Aug 10, 11 a.m. low-level wind shear with values of 20-25 kt (that likely increased further as the complex strengthened) indicating cold pool organization from rain-cooled air. A cold pool allows for stronger storm forward motion and wind momentum given the other ingredients. Also, these values are sufficient enough for tornado potential if defined storm inflow areas that can harness low-level turning were to develop.	Aug 10, 11 a.m. MCS maintenance parameter, which provides probabilistic information combining shear profile data, mid-level lapse rates, instability, and mid and upper level wind flow. High probabilities of 90+ percent for ~200 miles ahead of the maturing storm complex are not surprising given the high values of these input parameters.


NWS Des Moines Doppler Radar Vertical Wind Profile data (separate tab for full resolution)	NWS Quad Cities Doppler Radar Vertical Wind Profile data (separate tab for full resolution)	NWS Chicago/Romeoville Doppler Radar Vertical Wind Profile data (separate tab for full resolution)
These are basically cross-sections of the derecho's wind profile, namely its rear-inflow jet (RIJ), as the system moved from west-to-east over the area. The RIJ is most mature as the system moves over the Quad Cities, with impressive 100+ mph winds immediately off the surface (some realized at the surface). Notice the unidirectional northwest flow of the low-level jet, ideal for momentum transfer of the strongest winds to the surface that was realized with frequent severe wind gusts persisting a half hour in places! Also interesting to note is the wind profile immediately ahead of the front edge of the derecho's front edge (i.e. the wind shift). For the NWS Chicago profile data, there is more low-level shear (~0-1.5 km) in that immediate pre-storm environment which may explain the tendency for more mesovortices and, in turn, corridors of enhanced wind damage and tornadoes in our area vs. further west.

Loop of MRMS regional reflectivity and RAP 0-2 km shear (shaded, barbs, and contours), showing the rapid increase in low-level shear as the derecho moved into northern Illinois. The increase in shear is thought to have influenced the development of mesovortices and efficient tornado production in northern Illinois and northwestern Indiana.

Click image for 14-hour satellite loop of the derecho shared on Twitter.

Rain Reports

Public Information Statement
National Weather Service Chicago IL
1103 PM CDT Tue Aug 11 2020 /1203 AM EDT Wed Aug 12 2020/

...Rainfall from Monday August 10th...

The following are rainfall amounts as measured in the morning by
NWS Cooperative observers and CoCoRaHS observers. Observations are
usually taken at 7 AM.

ILLINOIS                                     Rainfall
  Location (County):                         Amt(inches)

  South Beloit 2SE (Winnebago).................2.66
  Roscoe 2se (Winnebago).......................2.48
  Roscoe 2ESE (Winnebago)......................2.48
  Capron (Boone)...............................2.46
  Rockford 2ENE (Winnebago)....................1.30
  Hebron (McHenry).............................1.22
  Lake Villa 1SSW (Lake).......................1.00
  Woodstock 5nw (McHenry)......................0.98
  Brandon Road Lock & Dam (Will)...............0.94
  Lake Villa 2WSW (Lake).......................0.92
  Gurnee 2W (Lake).............................0.91
  Woodstock 4SW (McHenry)......................0.87
  Oregon (Ogle)................................0.85
  Bull Valley 2WNW (McHenry)...................0.83
  Kingston 2WNW (De Kalb)......................0.82
  New Lenox 3ENE (Will)........................0.75
  Morris 6ESE (Grundy).........................0.75
  McHenry (Stratton Lock & Dam) (McHenry)......0.74
  Winthrop Harbor (Lake).......................0.74
  New Lenox 3E (Will)..........................0.73
  Mokena 1W (Will).............................0.73
  Woodstock 1SSW (McHenry).....................0.73
  Lakemoor 2NW (McHenry).......................0.73
  Channahon 2SSE (Will)........................0.72
  Winthrop Harbor 1SSW (Lake)..................0.72
  Midlothian (Cook)............................0.72
  Carbon Hill 3.1N (Grundy)....................0.71
  Genoa (De Kalb)..............................0.71
  Coal City 4NNW (Grundy)......................0.71
  Beecher 3ENE (Will)..........................0.70
  Glen Ellyn 2SSE (Du Page)....................0.70
  Bourbonnais (Kankakee).......................0.70
  Plainfield 2SSE (Will).......................0.69
  Lake Forest 2NNE (Lake)......................0.69
  Manhattan 2SE (Will).........................0.68
  Round Lake 2WNW (Lake).......................0.68
  Elwood 5NE (Will)............................0.67
  Lockport 1SE (Will)..........................0.66
  Plainfield 3ESE (Will).......................0.66
  Aurora 4SE (Du Page).........................0.66
  Oak Park 2S (Cook)...........................0.66
  Elmhurst 1ESE (Du Page)......................0.64
  Wilmington 6NW (Will)........................0.63
  Naperville 4SSW (Will).......................0.63
  Wilmington 3SE (Will)........................0.63
  Morris 2SSE (Grundy).........................0.63
  Aurora 4SE (Du Page).........................0.63
  La Grange Park 1SSW (Cook)...................0.63
  Crystal Lake 1WSW (McHenry)..................0.62
  La Salle (La Salle)..........................0.62
  Naperville 2SE (Du Page).....................0.62
  Oak Park 1SW (Cook)..........................0.62
  Oak Lawn 2SE (Cook)..........................0.62
  DeKalb (De Kalb).............................0.62
  Joliet 2n (Will).............................0.61
  Crete 3E (Will)..............................0.61
  Plano (Kendall)..............................0.61
  Huntley (McHenry)............................0.59
  Naperville 2ESE (Du Page)....................0.59
  Peru 1ENE (La Salle).........................0.58
  De Kalb 1SW (De Kalb)........................0.58
  Oswego 5SSE (Kendall)........................0.57
  Waukegan (Lake)..............................0.56
  Steward (Lee)................................0.56
  Pontiac (Livingston).........................0.56
  Algonquin 1N (McHenry).......................0.56
  Beecher 3SSE (Will)..........................0.55
  Westmont 1SSW (Du Page)......................0.55
  Oak Forest 1SSE (Cook).......................0.55
  Joliet 3WNW (Will)...........................0.54
  Cary (McHenry)...............................0.54
  Emington 2SSE (Livingston)...................0.54
  Somonauk 2NE (De Kalb).......................0.54
  Naperville 2ESE (Du Page)....................0.53
  Seneca 1NNE (La Salle).......................0.52
  Gilberts (Kane)..............................0.52
  Cortland (De Kalb)...........................0.52
  Glen Ellyn (Du Page).........................0.52
  Lisle Morton Arb (Du Page)...................0.51
  Rockford (Winnebago).........................0.51
  Peru 1SW (La Salle)..........................0.51
  Gibson 3WNW (Ford)...........................0.51
  Elmhurst 2SE (Du Page).......................0.51
  Oak Lawn (Cook)..............................0.51
  Morris (Grundy)..............................0.50
  Elgin (Kane).................................0.50
  Park Forest 1NNE (Cook)......................0.49
  Rogers Park 2SW (Cook).......................0.49
  Chicago Ridge (Cook).........................0.49
  Waukegan 2N (Lake)...........................0.48
  Dixon 3NNW (Lee).............................0.48
  Elgin 2W (Kane)..............................0.48
  Coal City 3N (Grundy)........................0.48
  Homewood (Cook)..............................0.48
  Park Forest (Cook)...........................0.47
  Paw Paw (Lee)................................0.47
  Watseka 6.9WNW (Iroquois)....................0.47
  Morris 5NNW (Grundy).........................0.47
  Naperville 1NW (Du Page).....................0.47
  Westmont (Du Page)...........................0.46
  Mundelein (Lake).............................0.46
  Elgin 2WNW (Kane)............................0.46
  Glencoe (Cook)...............................0.46
  Winnetka 1ESE (Cook).........................0.46
  Aurora (Kane)................................0.46
  Romeoville (Will)............................0.45
  Lake Zurich 1N (Lake)........................0.45
  Riverwoods (Lake)............................0.44
  Ashton (Lee).................................0.44
  Sugar Grove 1NE (Kane).......................0.44
  Buckley (Iroquois)...........................0.44
  Ashkum 5.6E (Iroquois).......................0.44
  Bolingbrook 3NE (Du Page)....................0.44
  Peotone (Will)...............................0.43
  Channahon 1NNE (Will)........................0.43
  Peotone (Will)...............................0.43
  Sugar Grove 1ENE (Kane)......................0.43
  Morris (Grundy)..............................0.43
  Lansing (Cook)...............................0.42
  Mendota (La Salle)...........................0.42
  Geneva 1SSW (Kane)...........................0.42
  Lincolnwood 2E (Cook)........................0.42
  O`hare Airport (Cook)........................0.41
  Mendota (La Salle)...........................0.41
  Mundelein (Lake).............................0.41
  Batavia 1WNW (Kane)..........................0.41
  Batavia 1WSW (Kane)..........................0.40
  Minooka (Grundy).............................0.40
  Elk Grove Village 2WSW (Cook)................0.40
  Lemont (Cook)................................0.40
  Chatsworth (Livingston)......................0.40
  Bannockburn (Lake)...........................0.39
  North Aurora 2NE (Kane)......................0.39
  Geneva 4WSW (Kane)...........................0.39
  Montgomery 1SSE (Kendall)....................0.39
  Lisle (Du Page)..............................0.39
  Highwood 1S (Lake)...........................0.38
  Batavia 2WNW (Kane)..........................0.38
  Lisle 1SE (Du Page)..........................0.38
  Oak Park 1NNE (Cook).........................0.38
  Oak Lawn 1N (Cook)...........................0.38
  Roselle 1ESE (Du Page).......................0.37
  Dwight (Livingston)..........................0.37
  Homer Glen 1ENE (Will).......................0.36
  Pontiac 1SE (Livingston).....................0.36
  North Utica 6N (La Salle)....................0.36
  Libertyville 2ESE (Lake).....................0.36
  Darien (Du Page).............................0.36
  Earlville 5NNE (De Kalb).....................0.36
  Mount Prospect 3NE (Cook)....................0.36
  Batavia (Kane)...............................0.36
  Paxton (Ford)................................0.35
  Ottawa 2N (La Salle).........................0.35
  Lake Bluff 1W (Lake).........................0.35
  St. Charles 6NW (Kane).......................0.35
  St. Charles (Kane)...........................0.35
  Midway Coop (Cook)...........................0.34
  Lisle 1SW (Du Page)..........................0.34
  Palatine 1NNE (Cook).........................0.34
  Lake Zurich (Lake)...........................0.33
  Buffalo Grove 2N (Lake)......................0.33
  Herscher 3E (Kankakee).......................0.33
  Plainfield 5SW (Kendall).....................0.33
  Earlville 3S (La Salle)......................0.33
  Schaumburg (Du Page).........................0.33
  Wheeling (Cook)..............................0.32
  Midway (Cook)................................0.32
  Coal City (Grundy)...........................0.32
  Gibson 6NE (Ford)............................0.32
  Burr Ridge 2SW (Du Page).....................0.32
  Bartlett 1SE (Du Page).......................0.32
  Wheaton 2NNE (Du Page).......................0.31
  Elk Grove Village 1ESE (Cook)................0.31
  Elmwood Park 1ESE (Cook).....................0.31
  West Chicago (Du Page).......................0.31
  Ottawa (La Salle)............................0.30
  Lombard 1NNW (Du Page).......................0.30
  Elmhurst (Du Page)...........................0.30
  Marseilles 5WNW (La Salle)...................0.29
  Arlington Heights 1S (Cook)..................0.28
  Hoffman Estates 5W (Cook)....................0.28
  Lincolnshire 1N (Lake).......................0.27
  Harwood Heights (Cook).......................0.27
  Ottawa 1NW (La Salle)........................0.25
  Palos Park 1SW (Cook)........................0.25
  St Anne (Kankakee)...........................0.24
  Paxton (Ford)................................0.24
  Bridgeview 1NNW (Cook).......................0.24
  Ottawa (La Salle)............................0.23
  Schaumburg 2E (Cook).........................0.23
  Cissna Park 1S (Iroquois)....................0.22
  Park Ridge (Cook)............................0.22
  Cropsey 1NE (Livingston).....................0.21
  Hoffman Estates 2SE (Cook)...................0.21
  Park Ridge 1WNW (Cook).......................0.20
  Streator (Livingston)........................0.18

INDIANA                                      Rainfall
  Location (County):                         Amt(inches)

  Hebron 1NW (Porter)..........................1.34
  Hebron 3SW (Lake)............................1.24
  Remington (Jasper)...........................1.15
  Lakes Of The Four Seasons (Porter)...........0.94
  Wheatfield 5W (Jasper).......................0.94
  Wheatfield 3S (Jasper).......................0.88
  Rensselaer 5NW (Jasper)......................0.84
  Mount Ayr 2NNE (Newton)......................0.80
  Hebron 4NE (Porter)..........................0.74
  Rensselaer (Jasper)..........................0.70
  Rensselaer 2N (Jasper).......................0.69
  De Motte 1NNW (Jasper).......................0.69
  Rensselaer 2SSW (Jasper).....................0.69
  Crown Point (Lake)...........................0.68
  Crown Point 1N (Lake)........................0.67
  Rensselaer 4N (Jasper).......................0.64
  De Motte 1SW (Jasper)........................0.64
  De Motte 6S (Jasper).........................0.64
  De Motte 1SSW (Jasper).......................0.62
  Rensselaer 10NNE (Jasper)....................0.61
  Wheatfield 4WSW (Jasper).....................0.59
  Rensselaer 8ENE (Jasper).....................0.59
  Porter 1S (Porter)...........................0.54
  Valparaiso 4SW (Porter)......................0.50
  Valparaiso 2N (Porter).......................0.49
  Portage 3E (Porter)..........................0.48
  Hammond 1SSW (Lake)..........................0.46
  Valparaiso 2NW (Porter)......................0.43
  Chesterton 1ENE (Porter).....................0.42
  Kentland 2SSE (Newton).......................0.42
  Rensselaer 6SE (Jasper)......................0.41
  Indiana Dunes (Porter).......................0.41
  Schererville 2ESE (Lake).....................0.38
  Hobart 2E (Lake).............................0.37
  Hobart 1SSW (Lake)...........................0.36
  Kentland (Newton)............................0.35
  Chesterton 4E (Porter).......................0.34
  Gary 5ENE (Lake).............................0.33
  Valparaiso 6SSW (Porter).....................0.30
  Schererville 1E (Lake).......................0.29
  Munster 2NNW (Lake)..........................0.27
  Schererville 1E (Lake).......................0.27
  Griffith 1N (Lake)...........................0.26
  St. John (Lake)..............................0.25
  Dyer 1WNW (Lake).............................0.23

Other NWS Office Recaps

Story Map (Multiple NWS Offices)
Central Iowa (NWS Des Moines)
Eastern Iowa and Northwest Illinois (NWS Quad Cities)
Southern Wisconsin (NWS Milwaukee)
Central Illinois (NWS Central Illinois)
Northern Indiana (NWS Northern Indiana)
Central Indiana (NWS Indianapolis)
National Summary (NWS Storm Prediction Center)
NWS Chicago Past Events Page

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Additional recaps can be found on the NWS Chicago Past Events Page

Flooding Threat Along the Gulf Coast, Southern Rockies and High Plains; Cooler Weather in the Central and Eastern U.S.

August 10, 2020: Corn Belt Derecho