Chicago, IL

Weather Forecast Office

Recap of August 4, 2012 Severe Thunderstorms and Rainfall

Overview and Science

Thunderstorms became well-organized across eastern Iowa by the late morning on August 4th, and would further strengthen into a long-lasting mesoscale convective complex (MCS) that would accelerate eastward through northern Illinois in the afternoon and northern Indiana during the evening.

KDVN and KLOT 0.5° Radar Composite

Courtesy of the NWS in Davenport, IA.

NWS Warnings Issued

Climatology favors the prime time for severe thunderstorm development being the mid-afternoon into the evening hours, while the morning tends to see a minimum of severe activity. The area of storms on the 4th however strengthened during the late morning and early afternoon, being driven by a parent, fast-moving circulation in the mid-levels (10,000-20,000 ft). This can be seen on the early morning water vapor imagery to the right across southeast Nebraska and northeast Kansas, with the red specks indicating lightning strikes in storms developing in advance of the disturbance. This wave was associated with stronger mid-level winds, which has been shown to be a key ingredient in long duration thunderstorm complexes. Below in Fig. 1 is a depiction of these stronger winds at 500 mb. The winds allowed for a substantial increase in deep layer shear, as seen in Fig. 2. This is another key ingredient for thunderstorm organization in any mode, especially large scale complexes. Deep layer shear by 10 am was 40-50 kt within and immediately ahead of the storm complex, which was a marked increase from just a few hours prior.

At the surface, southerly winds had allowed warmth and moisture to be advected north into central and northern Illinois. This had pooled along a warm-frontal boundary from northwest Illinois into east central Illinois, illustrated in Fig. 3 with the very high values of surface theta-e (combination of temperature and moisture). A very unstable and uncapped pre-storm environment was the response, as shown in the Fig. 4 plot of instability. With the mixing and instability being surface-based, this also was a sign strong winds reaching ground level would be probable.

The warmth and moisture ahead of the storms was being continuously advected into the ongoing complex. This was already apparent by 10 am on the storm-relative inflow graphic seen in Fig. 5.

Several of these parameters, namely mid and upper level winds, deep layer shear, and instability are combined into a term called Probability of MCS Maintenance, which is shown in Fig. 6. This was derived from research done in the past decade by multiple scientists on hundreds of these storm complexes. Note the 60% probabilities at that hour in advance of the ongoing storm complex which helped increase meteorologists' confidence that this would evolve eastward and likely gain in intensity.

6:30 am GOES Water Vapor Imagery, Analyzed 500 mb Heights, Observed 500 mb Wind Barbs, and Lightning Strikes

10:30 am Regional Radar Image

Fig. 1: 10 am 500 mb Winds	Fig. 2: 7-10 am Deep Layer Shear Change

Fig 3: 10 am Low-level Warmth and Moisture	Fig 4: 10 am Surface-based Instability

Fig 5: Low-level (0-2km) Storm-Relative Inflow	Fig 6: Probability of MCS Maintenance

Above analyses were done by the 40 km RAP Model with SPC objective enhancements and post-processing. These are available in real-time here.

2:15 pm GOES Visible Satellite Image

This visible satellite image depicts the well-organized thunderstorm complex by the bright, enhanced colder cloud tops. Individual cloud tops can be seen by the bumpy structure, and these cloud tops were 45,000 ft +. There was also ideal mass evacuation aloft depicted in part on this image by the clockwise-turn of the highest, outer periphery clouds, something often needed for a complex to persist for many hours.

Lightning was extremely frequent within this thunderstorm complex, with hourly rates of cloud-to-ground strikes over 10,000 during peak intensity.

Loop of Cloud-to-Ground Lightning Activity from Thunderstorm Complex

Hourly Loop from 11 am - 6 pm

Lightning from the August 4th Complex
Hour	# of Cloud-to-Ground Strikes
11 am-12 pm	~6,800
12pm-1pm	~12,500
1pm-2pm	~13,200
2pm-3pm	~11,800
3pm-4pm	~9,000
4pm-5pm	~8,200
5pm-6pm	~7,200
Total	~68,700

Radar

3:35 pm: KLOT 0.5° Reflectivity	3:35 pm: KLOT 0.5° Velocity

Velocity values on radar were measured in excess of 60 kt within 700 ft of the ground with the area of storms as it approached the far southwest metro of the Chicago area.

4:12 pm: KLOT 0.5° Reflectivity	4:12 pm: KLOT 0.5° Velocity

The thunderstorms intensified as they moved east from the radar with multiple pockets of radar velocities measured in excess of 60 kt within 1,000 ft of the ground. There were several reports of severe winds at the surface in this area.

4:20 pm: TORD FAA Terminal Doppler Weather Radar 0.3° Velocity

This velocity image from the FAA's Terminal Doppler Weather Radar that services the ORD airspace, depicts 50-60 mph winds within 600 ft of the ground in the leading edge of the storms approaching downtown Chicago. This FAA radar data is available to NWS meteorologists in real time.

Storm Reports

Preliminary Storm Reports Map

Yellow plots indicate wind, pink indicate hail, and blue indicate heavy rainfall and/or flash flooding.

National Storm Report Graphic and Listing From August 4th

Text Listing of Local Area Reports:

PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
844 PM CDT SAT AUG 04 2012

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0230 PM     TSTM WND DMG     POLO                    41.98N 89.58W 
08/04/2012                   OGLE               IL   CO-OP OBSERVER  

            BRACHES 6-8 INCHES IN DIAMETER DOWN. 0.88 INCHES OF RAIN.


0230 PM     HEAVY RAIN       3 NNW DIXON             41.89N 89.51W 
08/04/2012  M1.10 INCH       LEE                IL   COCORAHS        

            RAIN FELL IN PAST 25 MINUTES

0250 PM     TSTM WND DMG     OREGON                  42.01N 89.34W 
08/04/2012                   OGLE               IL   LAW ENFORCEMENT 

            NUMEROUS TREES AND POWERLINES DOWNED. TIME ESTIMATED PER 
            RADAR.

0256 PM     TSTM WND DMG     1 S UTICA               41.33N 89.01W 
08/04/2012                   LA SALLE           IL   LAW ENFORCEMENT 

            LARGE TREE DOWNED. TIME ESTIMATED PER RADAR.

0256 PM     TSTM WND GST     3 SE WINNEBAGO          42.24N 89.21W 
08/04/2012  E50.00 MPH       WINNEBAGO          IL   TRAINED SPOTTER 

            HEX ROAD EDWARDSVILLE

0301 PM     TSTM WND GST     MORRIS                  41.37N 88.43W 
08/04/2012  E50.00 MPH       GRUNDY             IL   EMERGENCY MNGR  

            HEAVY RAIN AS WELL

0308 PM     TSTM WND GST     5 SW ROCKFORD           42.22N 89.13W 
08/04/2012  M75.00 MPH       WINNEBAGO          IL   TRAINED SPOTTER 

0311 PM     TSTM WND DMG     5 SSE SHERIDAN          41.46N 88.65W 
08/04/2012                   LA SALLE           IL   LAW ENFORCEMENT 

            LARGE TREEN DOWNED ALONG IL HIGHWAY 71 NEAR THE SMALL 
            TOWN OF NORWAY. TIME ESTIMATED PER RADAR.

0314 PM     TSTM WND DMG     MORRIS                  41.37N 88.43W 
08/04/2012                   GRUNDY             IL   EMERGENCY MNGR  

            TREES DOWN AND TREES ON HOUSES

0315 PM     TSTM WND DMG     LISBON                  41.48N 88.48W 
08/04/2012                   KENDALL            IL   LAW ENFORCEMENT 

            SEVERAL LARGE TREES DOWNED ACROSS THE SOUTHERN PART OF 
            KENDALL COUNTY. TIME ESTIMATED PER RADAR.

0315 PM     TSTM WND GST     3 W WATERMAN            41.77N 88.83W 
08/04/2012  M68.00 MPH       DE KALB            IL   PUBLIC          

            RELAYED VIA FACEBOOK

0315 PM     TSTM WND DMG     MORRIS                  41.37N 88.43W 
08/04/2012                   GRUNDY             IL   TRAINED SPOTTER 

            600 FREEMONT AVENUE. 26 INCH DIAMETER TREE FELL ON HOUSE.
            ONE OTHER TREE SPLIT IN HALF.

0326 PM     TSTM WND GST     ROCKFORD                42.27N 89.06W 
08/04/2012  E50.00 MPH       WINNEBAGO          IL   NWS EMPLOYEE    

            SMALL BRACHES DOWN

0326 PM     HEAVY RAIN       POLO                    41.98N 89.58W 
08/04/2012  M1.25 INCH       OGLE               IL   TRAINED SPOTTER 

            TEMPERATURES DROPPED 22 DEGREES AS IT WENT THROUGH

0327 PM     TSTM WND GST     SOUTH WILMINGTON        41.17N 88.28W 
08/04/2012  E70.00 MPH       GRUNDY             IL   PUBLIC          

            ALSO HEAVY RAIN

0330 PM     TSTM WND DMG     AURORA                  41.77N 88.29W 
08/04/2012                   KANE               IL   TRAINED SPOTTER 

            SEVERAL LARGE PINE TREES SNAPPED. CATON FARM ROAD BETWEEN
            RT 47 AND ASHLEY

0331 PM     HEAVY RAIN       3 W GARDNER             41.19N 88.37W 
08/04/2012  E2.00 INCH       GRUNDY             IL   TRAINED SPOTTER 

            I55 MILE MARKER 227

0331 PM     TSTM WND GST     AURORA                  41.77N 88.29W 
08/04/2012  E70.00 MPH       KANE               IL   TRAINED SPOTTER 

0332 PM     HEAVY RAIN       2 NW COAL CITY          41.31N 88.31W 
08/04/2012  E3.18 INCH       GRUNDY             IL   TRAINED SPOTTER 

0335 PM     TSTM WND DMG     AURORA                  41.77N 88.29W 
08/04/2012                   KANE               IL   TRAINED SPOTTER 

            14 INCH MAPLE TREE FELL ON GARAGE

0348 PM     TSTM WND GST     NEW LENOX               41.52N 87.98W 
08/04/2012  E60.00 MPH       WILL               IL   EMERGENCY MNGR  

0349 PM     TSTM WND GST     ELGIN                   42.04N 88.29W 
08/04/2012  E60.00 MPH       KANE               IL   PUBLIC          

0352 PM     TSTM WND GST     HUNTLEY                 42.17N 88.42W 
08/04/2012  M71.00 MPH       MCHENRY            IL   AMATEUR RADIO   

            RELAYED FROM K7SC

0352 PM     TSTM WND GST     ROMEOVILLE              41.65N 88.09W 
08/04/2012  M55.00 MPH       WILL               IL   OFFICIAL NWS OBS

0352 PM     TSTM WND GST     DUPAGE AIRPORT          41.92N 88.25W 
08/04/2012  M58.00 MPH       DUPAGE             IL   ASOS            

0355 PM     FLASH FLOOD      YORKVILLE               41.64N 88.45W 
08/04/2012                   KENDALL            IL   LAW ENFORCEMENT 

            ONE TO TWO FEET OF WATER COVERING IL HIGHWAY 126. TIME 
            ESTIMATED PER RADAR END TIME OF HEAVIEST RAIN.

0356 PM     TSTM WND DMG     2 W MONEE               41.42N 87.79W 
08/04/2012                   WILL               IL   EMERGENCY MNGR  

            SEVERAL POWER POLES BLOWN OVER NEARLY TO GROUND /NOT 
            SNAPPED/ HARLEM RD 1 MI S OF MANHATTAN-MONEE RD. TIME 
            BASED ON RADAR. 

0356 PM     LIGHTNING        2 SW MONEE              41.40N 87.78W 
08/04/2012                   WILL               IL   EMERGENCY MNGR  

            BARN FIRE DUE TO LIGHTNING STRIKE NEAR HARLEM AVE AND 
            PAULING RD. TIME BASED ON RADAR.

0359 PM     HEAVY RAIN       YORKVILLE               41.64N 88.45W 
08/04/2012  M1.56 INCH       KENDALL            IL   CO-OP OBSERVER  

            RAIN FELL IN LAST 30 MINUTES

0400 PM     TSTM WND GST     MONEE                   41.42N 87.75W 
08/04/2012  E50.00 MPH       WILL               IL   TRAINED SPOTTER 

0400 PM     HAIL             HOFFMAN ESTATES         42.06N 88.14W 
08/04/2012  M1.00 INCH       COOK               IL   TRAINED SPOTTER 

            AT ALGONQUIN AND ROSELLE

0404 PM     TSTM WND GST     ISLAND LAKE             42.28N 88.20W 
08/04/2012  E45.00 MPH       LAKE               IL   PUBLIC          

0405 PM     HEAVY RAIN       PARK FOREST             41.48N 87.69W 
08/04/2012  M0.80 INCH       COOK               IL   TRAINED SPOTTER 

            RAIN FELL IN 30 MINUTES

0405 PM     HEAVY RAIN       2 NNE FRANKFORT         41.52N 87.82W 
08/04/2012  M1.00 INCH       WILL               IL   COCORAHS        

            RAIN IN PAST HOUR

0405 PM     TSTM WND GST     SOUTH BARRINGTON        42.09N 88.15W 
08/04/2012  E70.00 MPH       COOK               IL   PUBLIC          

            AT INTERSECTION OF ALGONQUIN AND BARRINGTON RDS.

0406 PM     TSTM WND GST     TINLEY PARK             41.57N 87.80W 
08/04/2012  U80.00 MPH       COOK               IL   TRAINED SPOTTER 

            AT THE AMPHITHEATRE

0410 PM     HEAVY RAIN       ELBURN                  41.89N 88.47W 
08/04/2012  M1.25 INCH       KANE               IL   COCORAHS        

            RAIN FELL IN 30 MINUTES. PONDING IN LOW LYING GRASS AREAS


0410 PM     HEAVY RAIN       3 WNW ALSIP             41.69N 87.79W 
08/04/2012  M1.00 INCH       COOK               IL   TRAINED SPOTTER 

            FELL IN PAST 35 MINUTES

0415 PM     TSTM WND DMG     MATTESON                41.51N 87.74W 
08/04/2012                   COOK               IL   PUBLIC          

            AT I-57 AND US 30, 4 INCH DIAMETER TREES SNAPPED AND 
            DEBRIS IN ROAD

0415 PM     TSTM WND GST     MIDWAY AIRPORT          41.78N 87.75W 
08/04/2012  M55.00 MPH       COOK               IL   ASOS            

0415 PM     TSTM WND GST     BROADVIEW               41.86N 87.86W 
08/04/2012  E50.00 MPH       COOK               IL   PUBLIC          

0415 PM     TSTM WND GST     OHARE AIRPORT           41.98N 87.90W 
08/04/2012  M53.00 MPH       COOK               IL   ASOS            

0415 PM     HEAVY RAIN       6 SE CHICAGO HEIGHTS    41.45N 87.57W 
08/04/2012  M0.79 INCH       WILL               IL   COCORAHS        

            FELL IN PAST 15 MINUTES

0417 PM     HEAVY RAIN       6 NNW JOLIET            41.60N 88.15W 
08/04/2012  M1.28 INCH       WILL               IL   TRAINED SPOTTER 

            FELL IN PAST 35 MINUTES

0417 PM     TSTM WND GST     HICKORY HILLS           41.72N 87.83W 
08/04/2012  M57.00 MPH       COOK               IL   TRAINED SPOTTER 

            87TH AND ROBERTS RD

0420 PM     TSTM WND GST     3 SW MIDWAY AIRPORT     41.75N 87.79W 
08/04/2012  M60.00 MPH       COOK               IL   CO-OP OBSERVER  

0423 PM     TSTM WND GST     GARY                    41.60N 87.34W 
08/04/2012  M61.00 MPH       LAKE               IN   ASOS            

0429 PM     TSTM WND DMG     LAKEVIEW                41.94N 87.65W 
08/04/2012                   COOK               IL   NWS EMPLOYEE    

            NUMEROUS LARGE TREES SNAPPED AND UPROOTED. TIME ESTIMATED
            PER RADAR.

0430 PM     TSTM WND DMG     S BEECHER               41.35N 87.61W 
08/04/2012                   WILL               IL   TRAINED SPOTTER 

            POWER LINES DOWN

0440 PM     TSTM WND GST     1 NNW HOMETOWN          41.75N 87.74W 
08/04/2012  U80.00 MPH       COOK               IL   TRAINED SPOTTER 

            MINOR FLOODING AROUND CICERO AVE AND 85TH.

0440 PM     TSTM WND GST     4 NE CHICAGO            41.92N 87.57W 
08/04/2012  M60.00 MPH       LMZ741             IL   C-MAN STATION   

0440 PM     TSTM WND GST     3 NE NORTH CHICAGO      42.35N 87.81W 
08/04/2012  M50.00 MPH       LMZ740             IL   C-MAN STATION   

0444 PM     TSTM WND GST     GRIFFITH                41.52N 87.42W 
08/04/2012  M70.00 MPH       LAKE               IN   TRAINED SPOTTER 

            RIDGE AND CLINE

0445 PM     HEAVY RAIN       2 NNW BURNHAM           41.66N 87.55W 
08/04/2012  M0.91 INCH       COOK               IL   TRAINED SPOTTER 

            RAIN FELL IN PAST 30 MINUTES

0445 PM     HEAVY RAIN       3 NE LINCOLN HILLS      41.50N 87.07W 
08/04/2012  M1.34 INCH       PORTER             IN   COCORAHS        

            PAST 30 MINUTES

0450 PM     HEAVY RAIN       3 SW MIDWAY AIRPORT     41.75N 87.79W 
08/04/2012  M1.43 INCH       COOK               IL   CO-OP OBSERVER  

0453 PM     TSTM WND GST     VALPARAISO              41.48N 87.05W 
08/04/2012  M59.00 MPH       PORTER             IN   ASOS            

0457 PM     LIGHTNING        VALPARAISO              41.48N 87.05W 
08/04/2012                   PORTER             IN   EMERGENCY MNGR  

            2 HOUSE FIRES DUE TO LIGHTNING

0500 PM     HEAVY RAIN       4 WSW BOONE GROVE       41.33N 87.19W 
08/04/2012  M0.85 INCH       PORTER             IN   COCORAHS        

            FELL IN PAST 15 MINUTES

0505 PM     TSTM WND GST     4 NE BEVERLY SHORES     41.73N 86.92W 
08/04/2012  M51.00 MPH       LMZ745             IN   C-MAN STATION   

0505 PM     HEAVY RAIN       4 NW MONTROSE HARBOR    42.00N 87.70W 
08/04/2012  E0.81 INCH       COOK               IL   COCORAHS        

            FELL IN PAST 30 MINUTES

0523 PM     TSTM WND DMG     SCHERERVILLE            41.49N 87.45W 
08/04/2012                   LAKE               IN   TRAINED SPOTTER 

            INTERSECTION OF RT 30 AND BURR. AT 14 INCH DIAMETER TREE 
            WHICH WAS 25 FEET TALL FELL ON HOUSE NEXT TO IT.

0552 PM     HEAVY RAIN       3 NW ALSIP              41.70N 87.78W 
08/04/2012  M2.10 INCH       COOK               IL   COCORAHS        

            RAIN IN PAST HOUR


&&

$$

Photos

Developing Shelf Cloud Indicative of Strong Winds 2W Winnebago	Large Maple Tree Downed in Aurora

Image courtesy of Skywarn Storm Spotter Eric LaPier	Image Courtesy of Paul Kluber

Trees Downed in Gould Park in Morris	Communications Tower Downed on Far Northeast Side of Morris

Image courtesy of Grundy County EMA	Image Courtesy of Grundy County EMA

Large Tree Branch Blown 25 ft from Parent Tree in Wilson Park Neighborhood of the Northwest Side of Chicago

Image courtesy of Skywarn Storm Spotter Mike Renkosiak

Rainfall Reports

Local Area Rainfall

From NWS Cooperative Observers, updated hourly 7-11 am

Illinois Rainfall	Indiana Rainfall

From NWS Cooperative Observers, updated around 10 am	From various official and unofficial sources, updated around 10 am

PUBLIC INFORMATION STATEMENT
NATIONAL WEATHER SERVICE CHICAGO IL
1018 AM CDT SUN AUG 05 2012

...MORNING RAINFALL ROUNDUP...

   THE FOLLOWING ARE RAIN AMOUNTS FOR THE PREVIOUS 24-HOURS
   AS MEASURED IN THE MORNING BY NWS COOPERATIVE OBSERVERS
   AND COCORAHS OBSERVERS.
   OBSERVATIONS ARE USUALLY TAKEN BETWEEN 6 AND 8 AM.

   24-HOUR RAINFALL AMOUNTS
       FOR SUNDAY(08/05/12)...


ILLINOIS                                       RAIN
  LOCATION (COUNTY):                           FALL (IN)

  SUBLETTE (LEE)...............................2.11
  PAW PAW (LEE)................................2.05
  MENDOTA 1N (LA SALLE)........................1.83
  MORRIS 5NNW (GRUNDY).........................1.77
  YORKVILLE 1NE (KENDALL)......................1.76
  AURORA (KANE)................................1.75
  YORKVILLE 1W (KENDALL).......................1.74
  SUGAR GROVE 1ENE (KANE)......................1.68
  SUGAR GROVE 1NE (KANE).......................1.65
  AMBOY (LEE)..................................1.62
  YORKVILLE 2SE (KENDALL)......................1.61
  NEWARK (KENDALL).............................1.58
  AURORA (KANE)................................1.55
  STEWARD (LEE)................................1.52
  MIDWAY 3SW (COOK)............................1.43
  DOWNERS GROVE 2SE (DU PAGE)..................1.40
  BURR RIDGE 2SW (DU PAGE).....................1.40
  DIXON 3NNW (LEE).............................1.37
  HOMER GLEN 1ENE (WILL).......................1.37
  MENDOTA 2SE (LA SALLE).......................1.31
  MILFORD (IROQUOIS)...........................1.30
  COUNTRYSIDE 1ENE (COOK)......................1.25
  MENDOTA (LA SALLE)...........................1.25
  YORKVILLE 2SSE (KENDALL).....................1.24
  LA SALLE (LA SALLE)..........................1.21
  ORLAND HILLS 1S (COOK).......................1.20
  AURORA 4NE (DU PAGE).........................1.20
  ST ANNE (KANKAKEE)...........................1.20
  MONTGOMERY 1SSE (KENDALL)....................1.18
  ST. CHARLES 6NW (KANE).......................1.15
  ORLAND HILLS 1SE (COOK)......................1.14
  ORLAND PARK 5WNW (WILL)......................1.12
  DIXON 2SW (LEE)..............................1.11
  DRESDEN LOCK/DAM (GRUNDY)....................1.10
  CHICAGO RIDGE (COOK).........................1.10
  ELBURN (KANE)................................1.09
  GENEVA 2WSW (KANE)...........................1.05
  PERU 1SW (LA SALLE)..........................1.05
  NAPERVILLE 4SSW (WILL).......................1.05
  OAK LAWN 2SE (COOK)..........................1.04
  WORTH (COOK).................................1.02
  ELGIN 1WSW (KANE)............................1.02
  ELBURN (KANE)................................1.02
  MIDWAY (COOK)................................1.02
  GENEVA 1WNW (KANE)...........................1.01
  OAK LAWN 1N (COOK)...........................1.00
  FLOSSMOOR (COOK).............................1.00
  GLEN ELLYN 2SSE (DU PAGE)....................1.00
  BATAVIA (KANE)...............................0.98
  SHERIDAN (LA SALLE)..........................0.97
  ROMEOVILLE (WILL)............................0.95
  COUNTRYSIDE 1NNE (COOK)......................0.94
  MANHATTAN 2SE (WILL).........................0.94
  ELGIN (KANE).................................0.92
  ELGIN 1S (KANE)..............................0.92
  EARLVILLE 8SSE (LA SALLE)....................0.92
  DARIEN 1NNE (DU PAGE)........................0.91
  ELGIN (KANE).................................0.90
  ELBURN 3NNE (KANE)...........................0.90
  BATAVIA 1WNW (KANE)..........................0.90
  COAL CITY (GRUNDY)...........................0.89
  MANHATTAN 5ENE (WILL)........................0.89
  CHANNAHON (WILL).............................0.88
  HOMER GLEN 4WNW (WILL).......................0.88
  PLAINFIELD 1SW (WILL)........................0.88
  PARK FOREST (COOK)...........................0.88
  MANHATTAN (WILL).............................0.87
  CHICAGO 5NE (COOK)...........................0.85
  SHERIDAN 3SSE (LA SALLE).....................0.85
  CRETE 3E (WILL)..............................0.85
  OAK LAWN (COOK)..............................0.84
  PARK FOREST 1NNE (COOK)......................0.84
  LINCOLNWOOD 2E (COOK)........................0.84
  CHANNAHON 2SSE (WILL)........................0.81
  CHICAGO 6ESE (COOK)..........................0.78
  PLAINFIELD 5SW (KENDALL).....................0.78
  ROCHELLE (OGLE)..............................0.77
  NAPERVILLE 3ESE (DU PAGE)....................0.76
  BYRON 3N (OGLE)..............................0.76
  PERU (LA SALLE)..............................0.76
  BARRINGTON (LAKE)............................0.75
  WILMINGTON 6NW (WILL)........................0.75
  HOFFMAN ESTATES 5W (COOK)....................0.74
  ST CHARLES 7NW (KANE)........................0.74
  NEW LENOX 4SE (WILL).........................0.73
  OAK PARK 2S (COOK)...........................0.70
  BUCKLEY (IROQUOIS)...........................0.69
  PECATONICA 2S (WINNEBAGO)....................0.69
  MORRIS 1SW (GRUNDY)..........................0.68
  CHANNAHON 1NNE (WILL)........................0.68
  OAK PARK 1NNE (COOK).........................0.67
  CHICAGO 6NNE (COOK)..........................0.66
  CHATSWORTH (LIVINGSTON)......................0.65
  OAK PARK 1NE (COOK)..........................0.65
  CHATSWORTH (LIVINGSTON)......................0.65
  OAK BROOK (DU PAGE)..........................0.64
  BOLINGBROOK 3NE (DU PAGE)....................0.63
  EVANSTON 1SSE (COOK).........................0.62
  GENEVA 1N (KANE).............................0.62
  MALTA (DE KALB)..............................0.61
  ELGIN 2W (KANE)..............................0.60
  AURORA 4SE (DU PAGE).........................0.59
  SENECA 1NE (LA SALLE)........................0.59
  WHEATON (DU PAGE)............................0.57
  LOCKPORT 1SE (WILL)..........................0.54
  WEST CHICAGO (DU PAGE).......................0.53
  RAVENSWOOD MANOR (COOK)......................0.53
  MORRIS 6ESE (GRUNDY).........................0.53
  MARSEILLES (LA SALLE)........................0.53
  GLEN ELLYN (DU PAGE).........................0.52
  LA GRANGE PARK 1SSW (COOK)...................0.51
  HARWOOD HEIGHTS 2NNE (COOK)..................0.49
  JOLIET (WILL)................................0.48
  PAXTON (FORD)................................0.48
  COAL CITY 4NNW (GRUNDY)......................0.47
  MARSEILLES 6WNW (LA SALLE)...................0.46
  DE KALB (DE KALB)............................0.45
  DE KALB 1W (DE KALB).........................0.45
  CAROL STREAM (DU PAGE).......................0.45
  WILMINGTON 3SE (WILL)........................0.45
  ROCKFORD 1NW (WINNEBAGO).....................0.45
  ROCKFORD (WINNEBAGO).........................0.45
  MARSEILLES 3NW (LA SALLE)....................0.44
  CHEBANSE (KANKAKEE)..........................0.43
  BARTLETT 1SSE (DU PAGE)......................0.42
  PEOTONE (WILL)...............................0.42
  ROCKFORD 2ENE (WINNEBAGO)....................0.42
  PEOTONE (WILL)...............................0.41
  PIPER CITY (FORD)............................0.41
  PEOTONE (WILL)...............................0.41
  FAIRBURY (LIVINGSTON)........................0.40
  LOMBARD 1NNW (DU PAGE).......................0.40
  ELMHURST (DU PAGE)...........................0.39
  WINFIELD (DU PAGE)...........................0.39
  OAK PARK 1SW (COOK)..........................0.37
  PEOTONE (WILL)...............................0.37
  OHARE (COOK).................................0.37
  OTTAWA 2N (LA SALLE).........................0.36
  KANKAKEE (KANKAKEE)..........................0.35
  SHELDON 3NE (IROQUOIS).......................0.35
  WEST CHICAGO 3N (DU PAGE)....................0.34
  NAPERVILLE 1NW (DU PAGE).....................0.34
  MOMENCE 3NE (KANKAKEE).......................0.34
  KANKAKEE 3SE (KANKAKEE)......................0.34
  DWIGHT (LIVINGSTON)..........................0.33
  INVERNESS 2S (COOK)..........................0.33
  PARK RIDGE (COOK)............................0.33
  OTTAWA 1NW (LA SALLE)........................0.32
  EMINGTON 2SSE (LIVINGSTON)...................0.32
  BELVIDERE (BOONE)............................0.31
  GENOA (DE KALB)..............................0.31
  ROCKFORD 4NW (WINNEBAGO).....................0.31
  GRANT PARK 6ENE (KANKAKEE)...................0.30
  ROCKFORD 3NE (WINNEBAGO).....................0.30
  BONFIELD 4NNE (KANKAKEE).....................0.29
  SCHAUMBURG 2SW (COOK)........................0.28
  ELK GROVE VILLAGE 2WSW (COOK)................0.27
  BRACEVILLE (GRUNDY)..........................0.26
  SYCAMORE 2NNE (DE KALB)......................0.25
  ROCKTON 1ESE (WINNEBAGO).....................0.25
  CORTLAND (DE KALB)...........................0.24
  WATSEKA 5W (IROQUOIS)........................0.24
  BONFIELD 2NW (KANKAKEE)......................0.24
  ALGONQUIN 1N (MCHENRY).......................0.24
  ELK GROVE VILLAGE 1ESE (COOK)................0.23
  BOURBONNAIS (KANKAKEE).......................0.22
  GLENCOE (COOK)...............................0.21
  BONFIELD 4WSW (KANKAKEE).....................0.21
  ALGONQUIN 1ENE (MCHENRY).....................0.20
  PONTIAC 1SE (LIVINGSTON).....................0.19
  ROSCOE 2ESE (WINNEBAGO)......................0.19
  ROSCOE 2SE (WINNEBAGO).......................0.19
  BOTANIC GARDENS (COOK).......................0.17
  BEACH PARK 1W (LAKE).........................0.13
  ZION (LAKE)..................................0.13
  CHENOA 4NNW (LIVINGSTON).....................0.13
  HUNTLEY 4W (MCHENRY).........................0.13
  OTTAWA (LA SALLE)............................0.13
  WINTHROP HARBOR (LAKE).......................0.12
  SCHAUMBURG  2E (COOK)........................0.11
  MOUNT PROSPECT 3NE (COOK)....................0.10
  BULL VALLEY 2WNW (MCHENRY)...................0.10
  HARVARD (MCHENRY)............................0.10
  WOODSTOCK 5NW (MCHENRY)......................0.10
  GURNEE 2NE (LAKE)............................0.09
  WAUKEGAN 2N (LAKE)...........................0.09
  WINTHROP HARBOR 1SSW (LAKE)..................0.09
  HARVARD 1S (MCHENRY).........................0.08
  WONDER LAKE 1WNW (MCHENRY)...................0.07
  MCHENRY (MCHENRY)............................0.07
  WHEELING (COOK)..............................0.07
  WAUKEGAN (LAKE)..............................0.07
  BUFFALO GROVE 2N (LAKE)......................0.06
  HAWTHORN WOODS 1N (LAKE).....................0.06
  HEBRON 1WNW (MCHENRY)........................0.06
  RIVERWOODS (LAKE)............................0.05
  STREATOR (LIVINGSTON)........................0.05
  LINCOLNSHIRE 1N (LAKE).......................0.03
  LAKEMOOR 2SE (LAKE)..........................0.03
  MUNDELEIN (LAKE).............................0.03
  WAUCONDA (LAKE)..............................0.03
  MUNDELEIN (LAKE).............................0.02

INDIANA                                        RAIN
  LOCATION (COUNTY):                           FALL (IN)

  RENSSELAER 10NNE (JASPER)....................1.68
  FAIR OAKS 6SW (NEWTON).......................1.68
  VALPARAISO 1NNW (PORTER).....................1.62
  VALPARAISO 2N (PORTER).......................1.55
  VALPARAISO 1SE (PORTER)......................1.49
  VALPARAISO 2NW (PORTER)......................1.49
  WHEATFIELD 3S (JASPER).......................1.42
  VALPARAISO 7WSW (PORTER).....................1.27
  VALPARAISO 5NNE (PORTER).....................1.26
  VALPARAISO 5NNE (PORTER).....................1.26
  DE MOTTE 3SE (JASPER)........................1.25
  MOUNT AYR 2NNE (NEWTON)......................1.21
  EARL PARK 2SSE (BENTON)......................1.20
  RENSSELAER 5NW (JASPER)......................1.18
  RENSSELAER (JASPER)..........................1.16
  WHEATFIELD 6NW (JASPER)......................1.10
  MOROCCO (NEWTON).............................1.10
  VALPARAISO 6S (PORTER).......................1.09
  VALPARAISO 2ESE (PORTER).....................1.09
  DE MOTTE 1NNW (JASPER).......................1.01
  WHEATFIELD 2ENE (JASPER).....................1.00
  DE MOTTE 1SSW (JASPER).......................0.97
  HEBRON 1NW (PORTER)..........................0.97
  HEBRON 4NE (PORTER)..........................0.96
  RENSSELAER 2SSW (JASPER).....................0.93
  VALPARAISO 6SW (PORTER)......................0.93
  DE MOTTE 4SW (JASPER)........................0.92
  DE MOTTE 6S (JASPER).........................0.90
  VALPARAISO 6NW (PORTER)......................0.88
  RENSSELAER 4N (JASPER).......................0.84
  VALPARAISO 6WSW (PORTER).....................0.78
  CROWN POINT 1N (LAKE)........................0.74
  ST. JOHN (LAKE)..............................0.74
  CROWN POINT 8E (PORTER)......................0.70
  LAKES OF THE FOUR SEASONS (PORTER)...........0.68
  HIGHLAND 1S (LAKE)...........................0.66
  PORTER 1S (PORTER)...........................0.66
  LOWELL (LAKE)................................0.60
  LAKE VILLAGE 2W (NEWTON).....................0.57
  VALPARAISO (PORTER)..........................0.57
  CROWN POINT 2WSW (LAKE)......................0.55
  PORTER 1S (PORTER)...........................0.55
  PORTAGE 3E (PORTER)..........................0.55
  LAKES OF THE FOUR SEASONS 1WSW (LAKE)........0.48
  KENTLAND 2SSE (NEWTON).......................0.48
  KENTLAND (NEWTON)............................0.45
  REMINGTON (JASPER)...........................0.45
  HAMMOND 3SW (LAKE)...........................0.33
  RENSSELAER 8ENE (JASPER).....................0.29
  REMINGTON (JASPER)...........................0.27

$$

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