Alert archive / Illinois / Flash Flood Watches in 2011
Flash Flood Watch 3, NWS Chicago, IL
NWS Chicago, IL issued this flash flood watch at Jul 23, 2011, 4:15 PM CDT for 10 counties in Illinois; Lake County, Porter County, Indiana. It was in force for 18 hr.
The area
The counties it named.
The facts
- Issued
- Jul 23, 2011, 4:15 PM CDT (21:15 UTC)
- Expired
- Jul 24, 2011, 10:38 AM CDT
- In force
- 18 hr
- Issued by
- NWS Chicago, IL
- Flood severity
- None
Counties Boone County, IL, DeKalb County, IL, DuPage County, IL, Kane County, IL, Kendall County, IL, Lake County, IL, Lee County, IL, McHenry County, IL, Ogle County, IL, Winnebago County, IL, Lake County, IN, Porter County, IN
The radar
The Chicago radar (KLOT), 47 km from the middle of the area, began a volume at 21:15 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
The nearest sounding before it
Lincoln, IL (KILX), launched 12:00Z, 9.3 hours before the alert went out and 200 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 2622 J/kg
- Mixed-layer CIN
- -57 J/kg
- Mixed-layer LCL
- 869 m above ground
- 0-6 km bulk shear
- 22 kt
- 0-1 km storm-relative helicity
- 51 m²/s²
- 0-3 km storm-relative helicity
- 64 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
What forecasters said that day
The local office's own words before this flash flood watch went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Chicago, IL wrote its last area forecast discussion before this flash flood watch went out at Jul 23, 4:10 PM CDT, 5 minutes earlier.
Area forecast discussion, Jul 23, 4:10 PM CDT, 5 minutes before
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</html>Hazardous weather outlook, Jul 23, 11:28 AM CDT, 4 hours 47 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL 1128 AM CDT SAT JUL 23 2011 ILZ003>006-008-010>014-019>023-032-033-039-INZ001-002-010-011-019- 241630- WINNEBAGO-BOONE-MCHENRY-LAKE ILLINOIS-OGLE-LEE-DE KALB-KANE- DUPAGE-COOK-LA SALLE-KENDALL-GRUNDY-WILL-KANKAKEE-LIVINGSTON- IROQUOIS-FORD-LAKE INDIANA-PORTER-NEWTON-JASPER-BENTON- 1128 AM CDT SAT JUL 23 2011 /1228 PM EDT SAT JUL 23 2011/ THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH CENTRAL ILLINOIS... NORTHEAST ILLINOIS AND NORTHWEST INDIANA. .DAY ONE...THIS AFTERNOON AND TONIGHT. WEATHER HAZARDS EXPECTED: THUNDERSTORMS...SOME MAY PRODUCE: HEAVY RAINFALL WITH FLASH FLOODING. FREQUENT LIGHTNING. DAMAGING WINDS IN EXCESS OF 60 MPH. OPPRESSIVE HEAT AND HUMIDITY. AREAS AFFECTED AND TIMING: SHOWERS AND THUNDERSTORMS ARE EXPECTED TO CONTINUE TO MOVE ACROSS NORTHERN ILLINOIS NORTH OF INTERSTATE 80 THROUGH EARLY AFTERNOON. DURING THE AFTERNOON HOURS THERE IS CONSIDERABLE UNCERTAINTY REGARDING ADDITIONAL THUNDERSTORM DEVELOPMENT. IT DOES APPEAR THAT ADDITIONAL THUNDERSTORMS MAY DEVELOP ALONG AND TO THE SOUTH OF THE CURRENT LINE OF THUNDERSTORMS MOVING ACROSS NORTHERN ILLINOIS. IF THIS DOES OCCUR...THIS WOULD AFFECT AREAS ALONG AND SOUTH OF INTERSTATE 80 LATER THIS AFTERNOON...ESPECIALLY IN INDIANA. THE DANGEROUS HEAT AND HUMIDITY WILL CONTINUE...ESPECIALLY SOUTH OF INTERSTATE 80. DISCUSSION: STRONG THUNDERSTORMS PRODUCED VERY HEAVY RAINFALL OVERNIGHT WITH AMOUNTS UP TO 7 INCHES ALREADY OBSERVED AT SOME LOCATIONS OVER THE DES PLAINES RIVER BASIN. LOCATIONS ON THE DES PLAINES RIVER HAVE RAPIDLY REACHED FLOOD STAGE AND WILL CONTINUE TO RISE THIS AFTERNOON. WITH ADDITIONAL PERIODS OF HEAVY RAINFALL POSSIBLE THROUGH SUNDAY AFTERNOON...ADDITIONAL FLASH FLOODING AND SIGNIFICANT RISES ON AREA RIVERS ARE POSSIBLE OVER THE NEXT 24 TO 36 HOURS. THE MOST LIKELY LOCATION FOR FLASH FLOODING WILL BE ALONG AND NORTH OF INTERSTATE 88. HOWEVER...THIS THREAT AREA MAY BEGIN TO SHIFT SOUTH AROUND THE INTERSTATE 80 CORRIDOR LATER THIS AFTERNOON. WITH INCREASING SUNSHINE LATER TODAY...LOCATIONS SOUTH OF INTERSTATE 80 SHOULD SEE TEMPERATURES RISE INTO THE MIDDLE 90S. WITH HIGH HUMIDITY ALREADY IN PLACE...HEAT INDEX VALUES SHOULD REACH 110 TO 115 DEGREES. LOCATIONS ALONG THE INTERSTATE 80 CORRIDOR...AWAY FROM THE CHICAGO METRO AREA...SHOULD SEE TEMPERATURES REACH INTO THE UPPER 80S TO THE LOW 90S. HEAT INDEX VALUES SHOULD REACH BETWEEN 100 AND 105 DEGREES. THE HEAT INDEX OVER THE CHICAGO METRO AREA SHOULD BE BETWEEN 95 AND 100 DEGREES. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY. LOCATIONS SOUTH OF INTERSTATE 80 WILL SEE HEAT INDEX VALUES OF 110 TO 115 DEGREES ON SUNDAY. LOCATIONS ALONG THE INTERSTATE 80 CORRIDOR WILL SEE HEAT INDEX VALUES OF AROUND 105 TO 110 DEGREES ON SUNDAY. THERE WILL BE PERIODIC CHANCES FOR THUNDERSTORMS SUNDAY AND AGAIN WEDNESDAY THROUGH FRIDAY. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE NECESSARY THROUGH TONIGHT...ESPECIALLY FOR FLASH FLOODING. && COMPLETE FORECAST INFORMATION IS AVAILABLE ON THE NWS CHICAGO WEBPAGE: WEATHER.GOV/CHICAGO LMZ740>745-241630- WINTHROP HARBOR TO WILMETTE HARBOR- WILMETTE HARBOR TO NORTHERLY ISLAND- NORTHERLY ISLAND TO CALUMET HARBOR-CALUMET HARBOR TO GARY- GARY TO BURNS HARBOR-BURNS HARBOR TO MICHIGAN CITY- 1128 AM CDT SAT JUL 23 2011 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE ILLINOIS NEARSHORE WATERS OF LAKE MICHIGAN AND THE INDIANA NEARSHORE WATERS OF LAKE MICHIGAN. .DAY ONE...THIS AFTERNOON AND TONIGHT. THERE IS A CHANCE OF STORMS CAUSING WIND GUSTS IN EXCESS OF 35 KNOTS AND FREQUENT LIGHTNING. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY. THERE WILL BE PERIODIC CHANCES FOR THUNDERSTORMS SUNDAY AND AGAIN WEDNESDAY THROUGH FRIDAY. && COMPLETE FORECAST INFORMATION IS AVAILABLE ON THE NWS CHICAGO WEBPAGE: WEATHER.GOV/CHICAGO LMZ080-261-362-364-366-563-565-567-669-671-673-675-777-779-868- 870-872-874-876-878-241630- LAKE MICHIGAN FROM MICHIGAN CITY IN TO ST. JOSEPH MI 5 NM OFFSHORE TO MID LAKE- LAKE MICHIGAN FROM SEUL CHOIX POINT TO ROCK ISLAND PASSAGE 5 NM OFFSHORE TO MID LAKE- LAKE MICHIGAN SOUTH OF A LINE FROM SEUL CHOIX POINT TO THE MACKINAC BRIDGE AND NORTH OF A LINE FROM CHARLEVOIX MI TO SOUTH FOX ISLAND 5 NM OFFSHORE- LAKE MICHIGAN FROM CHARLEVOIX TO POINT BETSIE MI 5 NM OFFSHORE TO MID LAKE- LAKE MICHIGAN FROM POINT BETSIE TO MANISTEE MI 5 NM OFFSHORE TO MID LAKE- LAKE MICHIGAN FROM ROCK ISLAND PASSAGE TO STURGEON BAY WI- LAKE MICHIGAN FROM STURGEON BAY TO TWO RIVERS WI 5 NM OFFSHORE TO MID LAKE- LAKE MICHIGAN FROM TWO RIVERS TO SHEBOYGAN WI 5 NM OFFSHORE TO MID LAKE- LAKE MICHIGAN FROM SHEBOYGAN TO PORT WASHINGTON WI 5 NM OFFSHORE TO MID LAKE- LAKE MICHIGAN FROM PORT WASHINGTON TO NORTH POINT LIGHT WI 5 NM OFFSHORE TO MID LAKE- LAKE MICHIGAN FROM NORTH POINT LIGHT TO WIND POINT WI 5 NM OFFSHORE TO MID LAKE- LAKE MICHIGAN FROM WIND POINT WI TO WINTHROP HARBOR IL 5 NM OFFSHORE TO MID LAKE- LAKE MICHIGAN FROM WINTHROP HARBOR TO WILMETTE HARBOR IL 5 NM OFFSHORE TO MID LAKE- LAKE MICHIGAN FROM WILMETTE HARBOR IL TO MICHIGAN CITY IN 5 NM OFFSHORE TO MID LAKE- LAKE MICHIGAN FROM PENTWATER TO MANISTEE MI 5 NM OFFSHORE TO MID LAKE- LAKE MICHIGAN FROM WHITEHALL TO PENTWATER MI 5 NM OFFSHORE TO MID LAKE- LAKE MICHIGAN FROM GRAND HAVEN TO WHITEHALL MI 5 NM OFFSHORE TO MID LAKE- LAKE MICHIGAN FROM HOLLAND TO GRAND HAVEN MI 5 NM OFFSHORE TO MID LAKE- LAKE MICHIGAN FROM SOUTH HAVEN TO HOLLAND MI 5 NM OFFSHORE TO MID LAKE- LAKE MICHIGAN FROM ST. JOSEPH TO SOUTH HAVEN MI 5 NM OFFSHORE TO MID LAKE- 1128 AM CDT SAT JUL 23 2011 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE OPEN WATERS OF LAKE MICHIGAN. .DAY ONE...THIS AFTERNOON AND TONIGHT. THERE IS A CHANCE OF STORMS CAUSING WIND GUSTS IN EXCESS OF 35 KNOTS AND FREQUENT LIGHTNING. THE STRONGEST STORMS ARE LIKELY OVER THE SOUTHERN PORTIONS OF THE LAKE. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY. THERE WILL BE PERIODIC CHANCES FOR THUNDERSTORMS SUNDAY AND AGAIN TUESDAY NIGHT THROUGH FRIDAY. && COMPLETE FORECAST INFORMATION IS AVAILABLE ON THE NWS CHICAGO WEBPAGE: WEATHER.GOV/CHICAGO KJB
In the hours before
Local storm report, Jul 23, 10:24 AM CDT, 5 hours 51 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
1024 AM CDT SAT JUL 23 2011
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0830 AM HEAVY RAIN 1 SW ARLINGTON HEIGHTS 42.08N 88.00W
07/23/2011 M7.25 INCH COOK IL COCORAHS
24-HOUR TOTAL FROM 830 AM TO 830 AM.
&&
RCLocal storm report, Jul 23, 11:45 AM CDT, 4 hours 30 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
1145 AM CDT SAT JUL 23 2011
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0900 AM HEAVY RAIN ROSELLE 41.98N 88.08W
07/23/2011 M3.35 INCH DUPAGE IL COCORAHS
IN 7 HOURS LEADING UP TO TIME OF REPORT.
&&
RCLocal storm report, Jul 23, 12:13 PM CDT, 4 hours 2 minutes before
PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
1213 PM CDT SAT JUL 23 2011
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
1130 PM HEAVY RAIN NE CARY 42.21N 88.25W
07/22/2011 M4.22 INCH MCHENRY IL COCORAHS
IN 3 HOURS. DELAYED REPORT. BACKYARD FLOODED.
1145 PM HAIL 5 E LOWELL 41.29N 87.32W
07/22/2011 E0.25 INCH LAKE IN LAW ENFORCEMENT
INTERSECTION OF INTERSTATE 65 AND ROUTE 2. FROM INDIANA
STATE POLICE.
1221 AM HAIL FORRESTON 42.13N 89.58W
07/23/2011 E0.25 INCH OGLE IL LAW ENFORCEMENT
PEA HAIL AND 30 TO 40 MPH WINDS. FROM OGLE COUNTY
SHERIFF.
1240 AM TSTM WND GST OHARE AIRPORT 41.98N 87.90W
07/23/2011 M47.00 MPH COOK IL ASOS
1242 AM TSTM WND GST MACHESNEY PARK 42.36N 89.04W
07/23/2011 E50.00 MPH WINNEBAGO IL TRAINED SPOTTER
SMALL BRANCHES DOWN.
1243 AM FLOOD MACHESNEY PARK 42.36N 89.04W
07/23/2011 WINNEBAGO IL TRAINED SPOTTER
STREET FLOODING BEGINNING AT WINDSOR AND ROUTE 251.
1255 AM MARINE TSTM WIND 4 NE CHICAGO 41.92N 87.57W
07/23/2011 E50.00 MPH LMZ741 IL C-MAN STATION
GUST TO 50 MPH AT THE HARRISON DEVER CRIB.
0120 AM MARINE TSTM WIND 4 NE CHICAGO 41.92N 87.57W
07/23/2011 M53.00 MPH LMZ741 IL C-MAN STATION
GUST TO 53 MPH AT THE HARRISON DEVER CRIB.
0130 AM HEAVY RAIN MCHENRY 42.34N 88.29W
07/23/2011 M2.51 INCH MCHENRY IL EMERGENCY MNGR
IN APPROXIMATELY 30 MINUTES. DELAYED REPORT.
0151 AM HEAVY RAIN OHARE AIRPORT 41.98N 87.90W
07/23/2011 M2.34 INCH COOK IL ASOS
MEASURED RAINFALL OF 2.34 INCHES BETWEEN 1251 AM AND 151
AM OBSERVATIONS.
0152 AM HEAVY RAIN WHEELING 42.13N 87.92W
07/23/2011 M3.09 INCH COOK IL ASOS
MEASURED RAINFALL OF 3.09 INCHES ENDING WITH THE 152 AM
OBSERVATION.
0200 AM HEAVY RAIN 2 NW MELROSE PARK 41.92N 87.89W
07/23/2011 M1.84 INCH COOK IL COCORAHS
MEASURED RAINFALL OF 1.84 INCHES BETWEEN 1 AM AND 2 AM.
0220 AM FLASH FLOOD 2 N CHICAGO 41.91N 87.63W
07/23/2011 COOK IL EMERGENCY MNGR
UNDERPASS FROM NORTHBOUND MICHIGAN AVENUE TO LAKE SHORE
DRIVE FLOODED.
0220 AM FLASH FLOOD 1 N CHICAGO 41.89N 87.63W
07/23/2011 COOK IL EMERGENCY MNGR
CARS STUCK ON CHICAGO AVENUE DUE TO FLOODING.
0220 AM FLASH FLOOD 2 NW CHICAGO 41.90N 87.66W
07/23/2011 COOK IL EMERGENCY MNGR
CITY OF CHICAGO OEMC REPORTS OHIO STREET RAMP TO I-94
KENNEDY EXPRESSWAY CLOSED DUE TO FLOODING.
0235 AM HEAVY RAIN 1 E PALATINE 42.11N 88.02W
07/23/2011 M4.64 INCH COOK IL TRAINED SPOTTER
SINCE RAIN BEGAN AROUND MIDNIGHT.
0245 AM HEAVY RAIN NAPERVILLE 41.76N 88.15W
07/23/2011 M1.60 INCH DUPAGE IL TRAINED SPOTTER
1.00 INCHES IN PAST 10 MINUTES.
0245 AM HEAVY RAIN SSE CAROL STREAM 41.91N 88.13W
07/23/2011 M3.20 INCH DUPAGE IL TRAINED SPOTTER
2.36 INCHES IN THE PAST 40 MINUTES.
0245 AM HEAVY RAIN 3 SSE DEERFIELD 42.13N 87.83W
07/23/2011 M3.59 INCH COOK IL EMERGENCY MNGR
RAINFALL FROM 1220 AM THROUGH 245 AM CDT.
0245 AM HEAVY RAIN 1 E PALATINE 42.11N 88.02W
07/23/2011 M3.60 INCH COOK IL COCORAHS
2.99 IN THE HOUR FROM 145 AM TO 245 AM CDT.
0251 AM HEAVY RAIN OHARE AIRPORT 41.98N 87.90W
07/23/2011 M5.53 INCH COOK IL ASOS
MEASURED RAINFALL OF 5.53 INCHES BETWEEN 1251 AM AND 251
AM OBSERVATIONS.
0252 AM HEAVY RAIN WHEELING 42.13N 87.92W
07/23/2011 M4.84 INCH COOK IL ASOS
MEASURED RAINFALL OF 4.84 INCHES ENDING WITH THE 252 AM
OBSERVATION.
0310 AM FLASH FLOOD CHICAGO 41.88N 87.63W
07/23/2011 COOK IL DEPT OF HIGHWAYS
MAJOR FLOODING FORCED CLOSURE OF ALL LANES OF I-94... THE
DAN RYAN EXPRESSWAY...IN BOTH DIRECTIONS AT 87TH STREET
AND NORTHBOUND AT 67TH STREET.
0323 AM HEAVY RAIN GLEN ELLYN 41.87N 88.06W
07/23/2011 M2.84 INCH DUPAGE IL COCORAHS
1 HOUR OF RAIN BETWEEN 223 AM AND 323 AM CDT. NORTH GLEN
ELLYN.
0504 AM HEAVY RAIN ARLINGTON HEIGHTS 42.09N 87.98W
07/23/2011 M5.52 INCH COOK IL TRAINED SPOTTER
RAINFALL SINCE MIDNIGHT MEASURED AT HINTZ ROAD AND
WINDSOR. STORM TOTAL SINCE FRIDAY 6.67 INCHES.
0600 AM HEAVY RAIN ELK GROVE VILLAGE 42.01N 87.99W
07/23/2011 M7.17 INCH COOK IL COCORAHS
24 HOUR TOTAL. 5.95 INCHES FELL OVERNIGHT. MANY
INTERSECTIONS IMPASSABLE DUE TO FLOOD WATERS.
0609 AM HEAVY RAIN HAMMOND 41.62N 87.49W
07/23/2011 M0.75 INCH LAKE IN PUBLIC
RAINFALL OVERNIGHT.
0630 AM HEAVY RAIN 3 SW MIDWAY AIRPORT 41.75N 87.79W
07/23/2011 M2.70 INCH COOK IL CO-OP OBSERVER
24 HOUR TOTAL. 1.90 INCHES FELL SINCE MIDNIGHT.
0700 AM HEAVY RAIN WESTMONT 41.80N 87.97W
07/23/2011 M2.79 INCH DUPAGE IL NWS EMPLOYEE
24-HOUR TOTAL. 2.29 INCHES FELL OVERNIGHT.
0700 AM HEAVY RAIN CRYSTAL LAKE 42.23N 88.33W
07/23/2011 M4.04 INCH MCHENRY IL CO-OP OBSERVER
24-HOUR TOTAL. 2 DAY TOTAL 4.91 INCHES.
0700 AM HEAVY RAIN WOODSTOCK 42.31N 88.44W
07/23/2011 M3.14 INCH MCHENRY IL CO-OP OBSERVER
24-HOUR TOTAL.
0700 AM HEAVY RAIN BARRINGTON 42.15N 88.13W
07/23/2011 M5.72 INCH COOK IL CO-OP OBSERVER
24-HOUR TOTAL AT CRABTREE NATURE CENTER.
0700 AM HEAVY RAIN WHEELING 42.13N 87.92W
07/23/2011 M6.06 INCH COOK IL ASOS
24-HOUR TOTAL AT CHICAGO EXECUTIVE AIRPORT. 3.63 INCHES
FELL BETWEEN 100 AM AND 700 AM.
0700 AM HEAVY RAIN ST. CHARLES 41.92N 88.30W
07/23/2011 M2.46 INCH KANE IL CO-OP OBSERVER
24-HOUR TOTAL. 1.77 INCHES FELL OVERNIGHT.
0700 AM HEAVY RAIN OHARE AIRPORT 41.98N 87.90W
07/23/2011 M8.20 INCH COOK IL ASOS
24-HOUR TOTAL FROM 700 AM 7/22 TO 700 AM 7/23. 6.85
INCHES BETWEEN 100 AM CDT AND 700 AM CDT ON 7/23. 0.06
INCHES FELL JUST BEFORE 100 AM CDT/1200 AM CST AND WILL
BE COUNTED FOR THE DAILY TOTAL ON 7/22.
0700 AM HEAVY RAIN AURORA 41.77N 88.29W
07/23/2011 M1.38 INCH KANE IL TRAINED SPOTTER
24-HOUR TOTAL.
0720 AM HEAVY RAIN MELROSE PARK 41.90N 87.86W
07/23/2011 M4.60 INCH COOK IL LAW ENFORCEMENT
TOTAL SINCE MIDNIGHT MEASURED BY MELROSE PARK PUBLIC
SAFETY.
0725 AM HEAVY RAIN LYONS 41.81N 87.82W
07/23/2011 M2.95 INCH COOK IL PUBLIC
24-HOUR TOTAL. 2.3 INCHES OVERNIGHT.
0738 AM HEAVY RAIN 5 NW POLO 42.04N 89.65W
07/23/2011 M1.99 INCH OGLE IL CO-OP OBSERVER
RAINFALL SINCE FRIDAY NIGHT.
0743 AM HEAVY RAIN WEST CHICAGO 41.89N 88.22W
07/23/2011 M2.64 INCH DUPAGE IL PUBLIC
24-HOUR TOTAL NEAR DUPAGE COUNTY AIRPORT. 1.89 INCHES
FELL OVERNIGHT.
0750 AM HEAVY RAIN 2 WSW ELK GROVE VILLAGE 41.99N 88.03W
07/23/2011 M5.86 INCH DUPAGE IL COCORAHS
24-HOUR TOTAL. 4.73 INCHES RECORDED BETWEEN 100 AM AND
330 AM.
0751 AM HEAVY RAIN ISLAND LAKE 42.28N 88.20W
07/23/2011 M3.71 INCH MCHENRY IL COCORAHS
24-HOUR TOTAL.
0800 AM HEAVY RAIN OAK BROOK 41.84N 87.95W
07/23/2011 M2.86 INCH DUPAGE IL CO-OP OBSERVER
24-HOUR TOTAL. 2.02 INCHES FELL OVERNIGHT.
0830 AM HEAVY RAIN 1 SW ARLINGTON HEIGHTS 42.08N 88.00W
07/23/2011 M7.25 INCH COOK IL COCORAHS
24-HOUR TOTAL FROM 830 AM TO 830 AM.
0900 AM HEAVY RAIN ROSELLE 41.98N 88.08W
07/23/2011 M3.35 INCH DUPAGE IL COCORAHS
IN 7 HOURS LEADING UP TO TIME OF REPORT.
0945 AM HEAVY RAIN NORTHBROOK 42.13N 87.83W
07/23/2011 M4.11 INCH COOK IL EMERGENCY MNGR
SINCE START OF RAIN...1220 AM.
1000 AM HEAVY RAIN INVERNESS 42.12N 88.10W
07/23/2011 M4.14 INCH COOK IL TRAINED SPOTTER
24-HOUR...10 AM TO 10 AM TOTAL.
1100 AM FLASH FLOOD PALATINE 42.11N 88.04W
07/23/2011 COOK IL PUBLIC
MAJOR FLOODING OF DRIVING RANGE AT NORTHWEST HIGHWAY AND
ROUTE 53. CLUB HOUSE IS SURROUNDED BY STANDING WATER.
ALSO APARTMENTS ON THE SOUTHWEST CORNER OF DUNDEE AND
ROUTE 53 ARE FLOODED.
&&
RCLocal storm report, Jul 23, 1:59 PM CDT, 2 hours 16 minutes before
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</html>The office that day
Everything else NWS Chicago, IL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 23, 12:11 AM CDT | Special Weather Statement | LOT | Ogle, Winnebago | 64 min |
| Jul 23, 12:36 AM CDT | Flash Flood Warning | LOT | Boone, Cook, DeKalb, Kane, Lake, McHenry and 2 more | 6 hr |
| Jul 23, 12:41 AM CDT | Severe Thunderstorm Warning | LOT | Boone, DeKalb, Lee, McHenry, Ogle, Winnebago | 64 min |
| Jul 23, 12:53 AM CDT | Severe Thunderstorm Warning | LOT | Cook, DuPage | 54 min |
| Jul 23, 12:58 AM CDT | Special Marine Warning | LOT | 2 hr | |
| Jul 23, 1:19 AM CDT | Flash Flood Warning | LOT | Cook, DuPage | 6 hr |
| Jul 23, 1:50 AM CDT | Special Weather Statement | LOT | DuPage | 55 min |
| Jul 23, 2:37 AM CDT | Flash Flood Warning | LOT | Cook, DuPage, Kane, Kendall, Will | 5 hr |
| Jul 23, 3:00 AM CDT | Special Marine Warning | LOT | 48 min | |
| Jul 23, 3:40 AM CDT | Heat Advisory | LOT | DeKalb, Grundy, Kane, Kendall, LaSalle, Lee and 2 more | 32 hr |
| Jul 23, 5:21 AM CDT | River Flood Warning | LOT | Cook | 38 hr |
| Jul 23, 5:21 AM CDT | River Flood Warning | LOT | Cook | 3 days |
| Jul 23, 6:14 AM CDT | River Flood Advisory | LOT | Will | 9 hr |
| Jul 23, 6:30 AM CDT | Flash Flood Warning | LOT | Boone, Cook, DeKalb, Kane, Lake, Lee and 3 more | 5 hr |
| Jul 23, 7:30 AM CDT | Flash Flood Warning | LOT | Cook, DuPage, Kane, Will | 4 hr |
| Jul 23, 9:37 AM CDT | River Flood Warning | LOT | Kane, McHenry | 11 hr |
| Jul 23, 9:37 AM CDT | River Flood Warning | LOT | Kane, Kendall | 23 hr |
| Jul 23, 11:13 AM CDT | Areal Flood Warning | LOT | Cook, DuPage, Lake | 19 hr |
| Jul 23, 2:46 PM CDT | River Flood Warning | LOT | Will | 43 hr |
| Jul 22, 10:20 PM CDT | Flash Flood Warning | LOT | Jasper, Lake, Newton, Porter | 6 hr |
| Jul 23, 8:09 AM CDT | Rip Current Statement | LOT | Lake, Porter | 6 hr |
| Jul 23, 5:27 PM CDT | Special Weather Statement | LOT | Jasper | 33 min |
| Jul 23, 6:41 PM CDT | Areal Flood Advisory | LOT | Jasper, Newton | 3 hr |
Nearby
Flash Flood Watches in Illinois, 2011Flash Flood Watches in Indiana, 2011Every flash flood watch in 2011
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.