Alert archive / Illinois / Flash Flood Warnings in 2009

Flash Flood Warning 21, NWS Chicago, IL

June 19, 20095 counties in Illinois

NWS Chicago, IL issued this flash flood warning at Jun 19, 2009, 6:00 PM CDT for 5 counties in Illinois. It was in force for 6 hr. 9 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued
Jun 19, 2009, 6:00 PM CDT (23:00 UTC)
Expired
Jun 19, 2009, 11:34 PM CDT
In force
6 hr
Issued by
NWS Chicago, IL
Area
Storm-based polygon
Flood severity
None

Counties Cook County, IL, DuPage County, IL, Kane County, IL, Lake County, IL, McHenry County, IL

The radar

The Chicago radar (KLOT), 63 km from the middle of the area, began a volume at 23:01 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.

What was reported inside it

TimeReportWhereRemark
Jun 19, 6:20 PM CDTFLASH FLOODGurnee, ILGRAND AVE AT SKOKIE HWY CLOSED DUE TO FLOODING
Jun 19, 6:40 PM CDTHEAVY RAIN 2Woodstock, ILMESURED IN LAST HOUR.
Jun 19, 6:57 PM CDTFLASH FLOOD1 Se Ohare Airport, ILN MANNHEIM RD BETWEEN I190 AND IRVING PARK RD CLOSED DUE TO FLOODING...SOUTHBOUND TRAFFIC BEING DIVERTED THROUGH OHARE AIRPORT
Jun 19, 6:57 PM CDTFLASH FLOODBartlett, ILHWY 59 AT BARTLETT RD BLOCKED DUE TO FLOODING
Jun 19, 6:57 PM CDTFLASH FLOODMount Prospect, ILELMHURST RD BETWEEN DEMPSTER ST AND W OAKTON ST CLOSED DUE TO FLOODING
Jun 19, 7:00 PM CDTHEAVY RAIN 1.133 W Grayslake, ILMEASURED IN LAST HOUR.
Jun 19, 7:32 PM CDTFLASH FLOODVernon Hills, ILNUMEROUS STREETS FLOODED. WATER DEPTH 6-8 INCHES.
Jun 19, 8:00 PM CDTHEAVY RAIN 2.881 N Evanston, IL2.88 INCHES SO FAR WITH 1.00 INCH IN PAST 45 MINUTES. COCORAHS OBSERVER
Jun 19, 8:17 PM CDTHEAVY RAIN 2.011 W Gurnee, IL2.01 INCHES IN THE PAST TWO HOURS. SOME STREET FLOODING.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 11.0 hours before the alert went out and 215 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.

Skew-T log-pSkew-T log-p diagram, Davenport, at 12:00Z on 2009-06-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2575 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Davenport, at 12:00Z on 2009-06-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 73 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
2575 J/kg
Mixed-layer CIN
-76 J/kg
Mixed-layer LCL
810 m above ground
0-6 km bulk shear
50 kt
0-1 km storm-relative helicity
73 m²/s²
0-3 km storm-relative helicity
167 m²/s²
Significant tornado parameter
1.9
Supercell composite
10.9

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
WGUS53 KLOT 192300
FFWLOT
ILC031-043-089-097-111-200500-
/O.NEW.KLOT.FF.W.0021.090619T2300Z-090620T0500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
600 PM CDT FRI JUN 19 2009

THE NATIONAL WEATHER SERVICE IN CHICAGO HAS ISSUED A

* FLASH FLOOD WARNING FOR...

  NORTHERN COOK COUNTY IN NORTHEAST ILLINOIS...
  DUPAGE COUNTY IN NORTHEAST ILLINOIS...
  KANE COUNTY IN NORTHEAST ILLINOIS...
  LAKE COUNTY IN NORTHEAST ILLINOIS...
  MCHENRY COUNTY IN NORTHEAST ILLINOIS...

* UNTIL MIDNIGHT CDT SATURDAY...

* AT 558 PM CDT...VERY HEAVY RAIN WAS REPORTED FROM A THUNDERSTORM
  OVER THE WARNED AREA.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO SKOKIE...
  ELGIN...WILMETTE HARBOR...WOODSTOCK...WONDER LAKE...WINTHROP
  HARBOR...WILMETTE...WHEELING...WAUKEGAN...WAUCONDA...WADSWORTH...
  VERNON HILLS...RICHMOND...PRAIRIE GROVE... PALATINE...             
  NORTHFIELD...NORTHBROOK...NORTH CHICAGO... MCHENRY...              
  MARENGO...LONG GROVE...LINDENHURST...LINCOLNSHIRE...
  LIBERTYVILLE...LAKEWOOD...LAKEMOOR...LAKE ZURICH...LAKE FOREST...
  HUNTLEY...HIGHLAND PARK...HEBRON...HARVARD...HAMPSHIRE...GURNEE...
  GRAYSLAKE...GLENVIEW...GLENCOE...GILBERTS...FOX LAKE...
  CARPENTERSVILLE...BUFFALO GROVE...BARRINGTON...ARLINGTON HEIGHTS...
  ANTIOCH AND ALGONQUIN

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING.
PEOPLE ALONG CREEKS AND STREAMS SHOULD TAKE IMMEDIATE ACTION TO
PROTECT LIFE AND PROPERTY. DO NOT DRIVE ACROSS FLOODED ROADS.

REPORT FLOODING TO THE NEAREST LAW ENFORCEMENT AGENCY FOR RELAY TO
THE NATIONAL WEATHER SERVICE FORECAST OFFICE IN CHICAGO.

HEAVY RAIN WILL RESULT IN FLOODING OF ROADS...VIADUCTS...
UNDERPASSES...CREEKS AND DRAINAGE AREAS. DO NOT DRIVE INTO FLOODED
AREAS AND KEEP CHILDREN AWAY FROM FLOOD WATERS.

&&

LAT...LON 4239 8780 4232 8783 4224 8781 4211 8773
      4206 8766 4185 8761 4175 8754 4174 8860
      4216 8859 4216 8871 4249 8870 4249 8779

$$

BRUMER
6 follow-up statements
000 
WGUS53 KLOT 192304 CCA
FFWLOT
ILC031-043-089-097-111-200500-
/O.COR.KLOT.FF.W.0021.090619T2300Z-090620T0500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING...CORRECTED
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
600 PM CDT FRI JUN 19 2009

THE NATIONAL WEATHER SERVICE IN CHICAGO HAS ISSUED A

* FLASH FLOOD WARNING FOR...

  NORTHERN COOK COUNTY IN NORTHEAST ILLINOIS...
  DUPAGE COUNTY IN NORTHEAST ILLINOIS...
  KANE COUNTY IN NORTHEAST ILLINOIS...
  LAKE COUNTY IN NORTHEAST ILLINOIS...
  MCHENRY COUNTY IN NORTHEAST ILLINOIS...

* UNTIL MIDNIGHT CDT SATURDAY...

* AT 558 PM CDT...ANOTHER AREA OF STORMS IS MOVING INTO NORTHEAST 
ILLINOIS AND WILL ADD ADDITIONAL RAINFALL TO AREAS ALREADY INUNDATED 
WITH RAIN FROM THIS MORNINGS STORMS. THIS FLASH FLOOD WARNING 
REPLACES THE FLOOD ADVISORY ALREADY IN EFFECT THROUGH 800 PM CDT.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO SKOKIE...
  ELGIN...WILMETTE HARBOR...WOODSTOCK...WONDER LAKE...WINTHROP
  HARBOR...WILMETTE...WHEELING...WAUKEGAN...WAUCONDA...WADSWORTH...
  VERNON HILLS...RICHMOND...PRAIRIE GROVE... PALATINE...             
  NORTHFIELD...NORTHBROOK...NORTH CHICAGO... MCHENRY...              
  MARENGO...LONG GROVE...LINDENHURST...LINCOLNSHIRE...
  LIBERTYVILLE...LAKEWOOD...LAKEMOOR...LAKE ZURICH...LAKE FOREST...
  HUNTLEY...HIGHLAND PARK...HEBRON...HARVARD...HAMPSHIRE...GURNEE...
  GRAYSLAKE...GLENVIEW...GLENCOE...GILBERTS...FOX LAKE...
  CARPENTERSVILLE...BUFFALO GROVE...BARRINGTON...ARLINGTON HEIGHTS...
  ANTIOCH AND ALGONQUIN

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING.
PEOPLE ALONG CREEKS AND STREAMS SHOULD TAKE IMMEDIATE ACTION TO
PROTECT LIFE AND PROPERTY. DO NOT DRIVE ACROSS FLOODED ROADS.

REPORT FLOODING TO THE NEAREST LAW ENFORCEMENT AGENCY FOR RELAY TO
THE NATIONAL WEATHER SERVICE FORECAST OFFICE IN CHICAGO.

HEAVY RAIN WILL RESULT IN FLOODING OF ROADS...VIADUCTS...
UNDERPASSES...CREEKS AND DRAINAGE AREAS. DO NOT DRIVE INTO FLOODED
AREAS AND KEEP CHILDREN AWAY FROM FLOOD WATERS.

&&

LAT...LON 4239 8780 4232 8783 4224 8781 4211 8773
      4206 8766 4185 8761 4175 8754 4174 8860
      4216 8859 4216 8871 4249 8870 4249 8779

$$

BRUMER
000 
WGUS73 KLOT 200005
FFSLOT

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
705 PM CDT FRI JUN 19 2009

ILC031-043-089-097-111-200500-
/O.CON.KLOT.FF.W.0021.000000T0000Z-090620T0500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MCHENRY IL-LAKE IL-COOK IL-KANE IL-DUPAGE IL-
705 PM CDT FRI JUN 19 2009

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL MIDNIGHT CDT FOR
DUPAGE...KANE...NORTHERN COOK...LAKE AND MCHENRY COUNTIES...

AT 658 PM CDT...NATIONAL WEATHER SERVICE RADAR CONTINUED TO INDICATE
AREAS OF THUNDERSTORMS PRODUCING HEAVY RAIN MOVING THROUGH THE 
WARNED AREA. WITH SATURATED GROUND FROM EARLIER RAINS ALONG WITH 
THESE NEW DELUGES...FLASH FLOODING WILL BE A CERTAINTY IN MANY PARTS 
OF NORTHEAST ILLINOIS. NEW RAINFALL AMOUNTS OF AT LEAST 1 TO 2 INCHES
CAN BE EXPECTED WITH THESE STORMS.

REPORT FLOODING TO THE NEAREST LAW ENFORCEMENT AGENCY FOR RELAY TO
THE NATIONAL WEATHER SERVICE FORECAST OFFICE IN CHICAGO.

DO NOT LET CHILDREN PLAY IN FLOOD SWOLLEN CREEKS...STREAMS...DRAINAGE
DITCHES...CULVERTS...OR RETENTION PONDS WHERE POWERFUL CURRENTS MAY
EXIST.

HEAVY RAIN WILL RESULT IN FLOODING OF ROADS...VIADUCTS...
UNDERPASSES...CREEKS AND DRAINAGE AREAS. DO NOT DRIVE INTO FLOODED
AREAS AND KEEP CHILDREN AWAY FROM FLOOD WATERS.

LAT...LON 4239 8780 4232 8783 4224 8781 4211 8773
      4206 8766 4185 8761 4175 8754 4174 8860
      4216 8859 4216 8871 4249 8870 4249 8779

$$
000 
WGUS73 KLOT 200102
FFSLOT

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
802 PM CDT FRI JUN 19 2009

ILC031-043-089-097-111-200500-
/O.CON.KLOT.FF.W.0021.000000T0000Z-090620T0500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MCHENRY IL-LAKE IL-COOK IL-KANE IL-DUPAGE IL-
802 PM CDT FRI JUN 19 2009

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL MIDNIGHT CDT FOR
DUPAGE...KANE...NORTHERN COOK...LAKE AND MCHENRY COUNTIES...

AT 757 PM CDT...THE LAST OF THE HEAVIER RAINS IS MOVING THROUGH 
NORTHEAST ILLINOIS. MOST OF THE RAINS...RESULTING IN SOME OF THE 
WORST FLOODING...OCCURRED IN MCHENRY AND LAKE COUNTIES. AN INCH OR 
LESS FELL ACROSS DUPAGE AND COOK COUNTIES...ADDING TO ONGOING 
FLOODING OR SLOWING THE RECEDING OF EARLIER FLOOD WATERS. AN END TO 
THE RAIN SHOULD OCCUR ACROSS NORTHEAST ILLINOIS BY 830 PM. HOWEVER 
IT WILL TAKE HOURS FOR FLOOD WATERS TO RECEDE EVEN AFTER THE RAIN 
ENDS.

REPORT FLOODING TO THE NEAREST LAW ENFORCEMENT AGENCY FOR RELAY TO
THE NATIONAL WEATHER SERVICE FORECAST OFFICE IN CHICAGO.

DO NOT LET CHILDREN PLAY IN FLOOD SWOLLEN CREEKS...STREAMS...DRAINAGE
DITCHES...CULVERTS...OR RETENTION PONDS WHERE POWERFUL CURRENTS MAY
EXIST.

LAT...LON 4239 8780 4232 8783 4224 8781 4211 8773
      4206 8766 4185 8761 4175 8754 4174 8860
      4216 8859 4216 8871 4249 8870 4249 8779

$$

BRUMER
000 
WGUS73 KLOT 200157
FFSLOT

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
857 PM CDT FRI JUN 19 2009

ILC031-043-089-097-111-200500-
/O.CON.KLOT.FF.W.0021.000000T0000Z-090620T0500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MCHENRY IL-LAKE IL-COOK IL-KANE IL-DUPAGE IL-
857 PM CDT FRI JUN 19 2009

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL MIDNIGHT CDT FOR
DUPAGE...KANE...NORTHERN COOK...LAKE AND MCHENRY COUNTIES...

AT 856 PM CDT...SIGNIFICANT RAIN HAS ENDED ACROSS NORTHEAST 
ILLINOIS. HOWEVER IT WILL BE SEVERAL HOURS BEFORE FLOOD WATERS 
RECEDE.

UNTIL THEN...BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS MORE 
DIFFICULT TO SEE WATER ON THE ROAD OR JUDGE HOW DEEP IT IS.

REPORT FLOODING TO THE NEAREST LAW ENFORCEMENT AGENCY FOR RELAY TO
THE NATIONAL WEATHER SERVICE FORECAST OFFICE IN ROMEOVILLE.

LAT...LON 4239 8780 4232 8783 4224 8781 4211 8773
      4206 8766 4185 8761 4175 8754 4174 8860
      4216 8859 4216 8871 4249 8870 4249 8779

$$

BRUMER
000 
WGUS73 KLOT 200257
FFSLOT

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
957 PM CDT FRI JUN 19 2009

ILC031-043-089-097-111-200500-
/O.CON.KLOT.FF.W.0021.000000T0000Z-090620T0500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MCHENRY IL-LAKE IL-COOK IL-KANE IL-DUPAGE IL-
957 PM CDT FRI JUN 19 2009

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL MIDNIGHT CDT FOR
DUPAGE...KANE...NORTHERN COOK...LAKE AND MCHENRY COUNTIES...

THUNDERSTORMS WHICH PRODUCED HEAVY RAINFALL ACROSS NORTHEAST 
ILLINOIS EARLIER THIS EVENING HAVE MOVED TO THE EAST AND OUT OF THE 
AREA. HOWEVER...RUNOFF FROM EARLIER HEAVY RAINFALL WILL CONTINUE TO 
PRODUCE FLOODING ACROSS NORTHEAST ILLINOIS FOR THE NEXT SEVERAL 
HOURS.

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS MORE DIFFICULT TO SEE
WATER ON THE ROAD OR JUDGE HOW DEEP IT IS.

LAT...LON 4239 8780 4232 8783 4224 8781 4211 8773
      4206 8766 4185 8761 4175 8754 4174 8860
      4216 8859 4216 8871 4249 8870 4249 8779

$$

RATZER
000 
WGUS73 KLOT 200434
FFSLOT

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
1134 PM CDT FRI JUN 19 2009

ILC031-043-089-097-111-200442-
/O.CAN.KLOT.FF.W.0021.000000T0000Z-090620T0500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MCHENRY IL-LAKE IL-COOK IL-KANE IL-DUPAGE IL-
1134 PM CDT FRI JUN 19 2009

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR DUPAGE...KANE...
NORTHERN COOK...LAKE AND MCHENRY COUNTIES...

HEAVY RAIN HAS ENDED AND THE THREAT OF FLASH FLOODING HAS 
DIMINISHED. HOWEVER...FLOODING OF CREEKS...SMALL STREAMS...AND LOW 
LYING AREAS WILL CONTINUE OVERNIGHT. AN AREAL FLOOD WARNING IS NOW 
IN EFFECT FOR PART OF NORTH CENTRAL AND NORTHEAST ILLINOIS UNTIL 930 
AM. 

LAT...LON 4239 8780 4232 8783 4224 8781 4211 8773
      4206 8766 4185 8761 4175 8754 4174 8860
      4216 8859 4216 8871 4249 8870 4249 8779

$$

ALLSOPP

The office that day

Everything else NWS Chicago, IL issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 19, 1:13 AM CDTSpecial Marine WarningLOT2 hr
Jun 19, 1:27 AM CDTSevere Thunderstorm WarningLOTBoone, Lake, McHenry, Winnebago63 min
Jun 19, 2:02 AM CDTSpecial Marine WarningLOT118 min
Jun 19, 4:42 AM CDTSpecial Marine WarningLOT77 min
Jun 19, 4:48 AM CDTSevere Thunderstorm WarningLOTCook, Lake24 min
Jun 19, 7:49 AM CDTSevere Thunderstorm WarningLOTBoone, McHenry, Winnebago45 min
Jun 19, 8:01 AM CDTSpecial Marine WarningLOT89 min
Jun 19, 8:31 AM CDTSevere Thunderstorm WarningLOTBoone, McHenry47 min
Jun 19, 8:55 AM CDTTornado WarningLOTKane, McHenry22 min
Jun 19, 9:17 AM CDTFlash Flood WarningLOTBoone, DeKalb, Kane, McHenry, Ogle, Winnebago4 hr
Jun 19, 9:31 AM CDTSpecial Marine WarningLOT119 min
Jun 19, 9:35 AM CDTSevere Thunderstorm WarningLOTBoone, Ogle, Winnebago70 min
Jun 19, 9:46 AM CDTSevere Thunderstorm WarningLOTCook, Lake29 min
Jun 19, 10:01 AM CDTSevere Thunderstorm WarningLOTDuPage, Kane42 min
Jun 19, 10:03 AM CDTFlash Flood WarningLOTCook, DuPage, Lake4 hr
Jun 19, 10:04 AM CDTRiver Flood WarningLOTLake9 days
Jun 19, 10:10 AM CDTRiver Flood AdvisoryLOTCook2 hr
Jun 19, 10:12 AM CDTSevere Thunderstorm WarningLOTDeKalb, Lee, Ogle63 min
Jun 19, 10:28 AM CDTSevere Thunderstorm WarningLOTCook, DuPage47 min
Jun 19, 10:57 AM CDTSpecial Marine WarningLOT115 min
Jun 19, 11:07 AM CDTSevere Thunderstorm WarningLOTCook, Kane, Lake, McHenry53 min
Jun 19, 11:23 AM CDTSevere Thunderstorm WarningLOTCook, DeKalb, DuPage, Kane67 min
Jun 19, 11:29 AM CDTSpecial Marine WarningLOT80 min
Jun 19, 12:25 PM CDTSevere Thunderstorm WarningLOTCook, DuPage50 min
Jun 19, 12:27 PM CDTRiver Flood WarningLOTCook8 days
Jun 19, 1:08 PM CDTFlash Flood WatchLOTBoone, DeKalb, DuPage, Ford, Grundy, Iroquois and 10 more8 hr
Jun 19, 2:13 PM CDTRiver Flood WarningLOTCook53 hr
Jun 19, 2:41 PM CDTSpecial Marine WarningLOT53 min
Jun 19, 4:35 PM CDTRiver Flood AdvisoryLOTBoone4 days
Jun 19, 5:36 PM CDTFlash Flood WarningLOTBoone, DeKalb, Lee, Ogle, Winnebago6 hr
Jun 19, 5:46 PM CDTTornado WarningLOTBoone29 min
Jun 19, 5:49 PM CDTSevere Thunderstorm WarningLOTDeKalb, Ford, Grundy, Kane, Kendall, LaSalle and 2 more41 min
Jun 19, 6:00 PM CDTSevere Thunderstorm WarningLOTFord, Iroquois, Livingston32 min
Jun 19, 6:03 PM CDTSpecial Marine WarningLOT87 min
Jun 19, 6:05 PM CDTSevere Thunderstorm WarningLOTLake55 min
Jun 19, 6:12 PM CDTSevere Thunderstorm WarningLOTBoone, DeKalb, Lee, Ogle, Winnebago63 min
Jun 19, 6:16 PM CDTTornado WarningLOTFord, Iroquois35 min
Jun 19, 6:23 PM CDTSpecial Marine WarningLOT112 min
Jun 19, 6:23 PM CDTSevere Thunderstorm WarningLOTCook, DeKalb, DuPage, Ford, Grundy, Iroquois and 7 more52 min
Jun 19, 6:28 PM CDTSevere Thunderstorm WarningLOTBoone, Lake, McHenry29 min
Jun 19, 6:38 PM CDTSevere Thunderstorm WarningLOTDeKalb, Grundy, Kendall, LaSalle, Lee, Livingston67 min
Jun 19, 6:56 PM CDTSevere Thunderstorm WarningLOTCook, DuPage, Iroquois, Kankakee, Will94 min
Jun 19, 6:56 PM CDTSevere Thunderstorm WarningLOTBoone, Cook, DeKalb, DuPage, Kane, Lake and 1 more43 min

Nearby

Flash Flood Warnings in Illinois, 2009Every flash flood warning in 2009

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.