Dangerous heat is expected to be in place across portions of California, especially the Central Valley, and across the Interior Northwest into Friday. Heat Advisories will also be in place across the southern Plains into the Lower Mississippi River Valley. Monsoonal showers and thunderstorms may result in flash flooding and debris flows from the Four Corners region and Southwest through Friday. Read More >
Overview
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Severe thunderstorms developed across all of northern and northwest Illinois on the evening of August 9, 2021. An outflow boundary present from morning storms lead to a favorable environment for tornadic development, with several forming from Bureau County to just west of the Chicago metro area. Three tornadoes occurred during the evening damaging corn, soybeans, and several farmsteads near Arlington, IL.
KML Link - All damage points + tornadoes
Surrounding Office Summaries |
West of Princeton, IL (Betsy Rowland) |
Tornadoes:
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Tornado #1 - 2.7 WSW Arlington IL
Track Map  
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Tornado #2 - 4.5 NW Princeton IL
Track Map 
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Tornado #3 - 1.6 SE Van Orin IL
Track Map 
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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 |
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Storm Reports
| Interactive Storm Report Map (IEM) | SPC Storm Reports |
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PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
1112 PM CDT MON AUG 9 2021
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0855 PM TSTM WND DMG 1 WNW KEWANEE 41.25N 89.94W
08/09/2021 HENRY IL EMERGENCY MNGR
POWER POLES DOWN NEAR BAKER PARK GOLF COURSE
AND ANOTHER DOWN NEAR NEW ST AND HIGH ST.
TIME OF THE EVENT WAS ESTIMATED USING RADAR.
0950 PM HAIL 2 SE BISHOP HILL 41.18N 90.09W
08/09/2021 E0.25 INCH HENRY IL EMERGENCY MNGR
0603 PM FUNNEL CLOUD 2 E OHIO 41.56N 89.42W
08/09/2021 BUREAU IL TRAINED SPOTTER
DEFINITE ROTATION.
0606 PM TORNADO 3 W VAN ORIN 41.56N 89.40W
08/09/2021 BUREAU IL TRAINED SPOTTER
BRIEF TOUCHDOWN THEN CAME RIGHT BACK UP.
0709 PM TORNADO 1 W ARLINGTON 41.47N 89.27W
08/09/2021 BUREAU IL TRAINED SPOTTER
RAIN WRAPPED TORNADO.
0724 PM TORNADO 4 NE WYANET 41.40N 89.54W
08/09/2021 BUREAU IL PUBLIC
PICTURE OF TORNADO ON THE GROUND RECEIVED
AROUND 726PM. ON THE GROUND 2 MIN PRIOR TO
PHOTO....HAS SINCE LIFTED.
&&
$$
Rainfall Reports
| Local Rainfall Analysis |
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24 hour precipitation reports (in Inches), for eastern Iowa, northwest and west central Illinois, and northeast Missouri. Reported between 6 AM and 9 AM, Tuesday August 10, 2021. ....IOWA.... Dubuque LD11 1.30 Rickardsville 0.2 W 0.73 Bellevue LD12 0.15 Dubuque #3 7 SW 0.05 Dubuque Arpt 0.02 Asbury 0.4 SW 0.01 Manchester 0.00 Ames US 30 2 SSE 0.00 Anamosa 3 SSW 0.00 Maquoketa 0.00 Muscatine 2N 0.00 Ely 0.5 SE 0.00 Rathbun Reservoir 2 N 0.00 Mt Pleasant 1 SSW 0.00 Beaconsfield 1 NNE 0.00 Oskaloosa AWOS 9 ESE 0.00 Washington 0.00 Oelwein 1E 0.00 Mason City ASOS 6 W 0.00 Davenport 0.9 WNW 0.00 Burlington 6.5 SSW 0.00 Camanche 1.2 W 0.00 Mount Auburn 2.2 NNW 0.00 Central City 6.7 W 0.00 Marengo 0.00 Mason City 1 NNE 0.00 Wapello 0.2 S 0.00 Ainsworth 7.4 N 0.00 Pella 4 N 0.00 Iowa City 0.00 Centerville 0 NE 0.00 Marion 1.7 NNW 0.00 Morning Sun 1.7 E 0.00 Elkader 6SSW 0.00 Cedar Rapids Arpt 0.00 NWS Johnston* 5 NNW 0.00 Le Claire LD14 0.00 Wellman 4.0 E 0.00 Davenport Arpt 0.00 Wapello 5.4 SE 0.00 Ottumwa ASOS 6 NNW 0.00 Oelwein AWOS 0.00 Marengo 3.6 N 0.00 Boone 1 SSW 0.00 Pella AWOS 2 WSW 0.00 Marshalltown 1 NW 0.00 Le Claire 1.8 NNE 0.00 Iowa City Arpt 0.00 Marengo 2.6 SSW 0.00 Donnellson 0.00 Perry 0 W 0.00 Charlotte 1.9 WNW 0.00 Vinton 0.00 Keokuk LD19 0.00 North Liberty 0.7 SSW 0.00 Oskaloosa 1 NNW 0.00 Burlington Arpt 0.00 Hampton 1 N 0.00 Parnell 0.1 SSW 0.00 Waterloo ASOS 5 NW 0.00 Fairfax 4.0 NW 0.00 Monticello 1 E 0.00 Keosauqua 0.00 Sigourney 0.00 Fairfield 0.00 Grinnell AWOS 2 SSW 0.00 Williamsburg 0.00 Marshalltown ASOS 4 N 0.00 West Liberty 0.7 NNW 0.00 Solon 0.3 ESE 0.00 Columbus Jct 2 SSW 0.00 ....ILLINOIS.... Rockford ASOS 2.51 Kewanee 1 E 2.20 Galva 2.7 NE 1.33 Ridott 0.1 NE 1.32 Mundelein 1.30 Freeport 1.30 Woodhull 0.3 ESE 1.21 Princeton 1.1 SE 1.20 Princeton 1.20 Alpha 2.3 N 1.10 Windsor 1.04 Davis 0.5 N 1.01 Freeport 1.7 NW 0.98 New Windsor 2.0 N 0.63 Mendota 2 SE 0.55 Paw Paw 1 E 0.43 Mount Carroll 6.8 NNW 0.43 Lanark 6.0 E 0.40 Elizabeth 0.40 Walnut 5.3 ENE 0.38 Lanark 5.3 N 0.32 Decatur Airport 0.28 Steward 0.27 Winslow 4.3 ESE 0.26 Tuscola 0.25 Ottawa 4 SW 0.20 Peoria ASOS 0.20 Lincoln NWS 0.12 Ogden 0.10 Streator 3 SE 0.08 Bloomington Airport 0.05 Geneseo 2.0 NW 0.01 Mount Carroll 0.01 Rochelle AWOS 0.01 Romeoville 0.00 Aledo 0.00 Quad City Arpt 0.00 Bentley 0.00 La Harpe 0.00 Rock Falls 0.00 Galesburg 0.00 Gladstone LD18 0.00 Fulton LD13 0.00 Augusta 0.00 Moline 0.7 NNE 0.00 New Boston LD17 0.00 Dallas City 3.0 SSE 0.00 Joliet 0.00 Quincy ASOS 0.00 St Anne 0.00 Coal Valley 1.9 SE 0.00 Coal Valley 2.6 E 0.00 Prairie City 2S 0.00 Ill. City LD16 3 WNW 0.00 Moline 2.5 W 0.00 Jacksonville AWOS 0.00 ....MISSOURI.... Chillicothe 2 NW 0.00 Columbia 0.00 Kirksville ASOS 0.00 ....WISCONSIN.... Beloit-College 1.80 Whitewater 1.52 Brodhead 1 SW 1.18 Sullivan-NWS 2 SE 0.80 Madison-ASOS 0.80 Allenton-WWTP .6 NW 0.40 Monroe 1 W 0.33 Viroqua 0.15 La Crosse WFO 0.11 Watertown-AWOS 0.02 Prairie du Chien AWOS 0.00 Steuben 4SE 3 NE 0.00 ....MINNESOTA.... Preston 0.00 |
Environment
SPC EVENT REVIEW PAGE: 08/09/2021
SPC Categorical/Tornado/Hail/Wind Outlooks
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| SPC Categorical Outlook | Tornado Outlook | Wind Outlook | Hail Outlook |
DVN Observed Sounding Analysis
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| 2 PM DAVENPORT, IA SOUNDING | 7 PM DAVENPORT, IA SOUNDING |
SPC Mesoscale Discussions
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| Mesoscale Discussion #1450 | Mesoscale Discussion #1453 | Mesoscale Discussion #1455 |
SPC Convective Watches
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| Tornado Watch #417 |
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