Alert archive / Illinois / Flash Flood Warnings in 2009
Flash Flood Warning 21, NWS St. Louis, MO
NWS St. Louis, MO issued this flash flood warning at May 25, 2009, 11:55 AM CDT for Madison County, Illinois. It was in force for 5 hr. 6 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
- May 25, 2009, 11:55 AM CDT (16:55 UTC)
- Expired
- May 25, 2009, 5:12 PM CDT
- In force
- 5 hr
- Issued by
- NWS St. Louis, MO
- Area
- Storm-based polygon
- Flood severity
- None
County Madison County, IL
The radar
The St Louis radar (KLSX), 73 km from the middle of the area, began a volume at 16:57 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
| Time | Report | Where | Remark |
|---|---|---|---|
| May 25, 12:11 PM CDT | HEAVY RAIN 2 | Glen Carbon, IL | TOTAL SO FAR...NO FLOODING OBSERVED AT TIME OF CALL |
| May 25, 2:12 PM CDT | FLOOD | Edwardsville, IL | REPORTED DRAINAGE DITCHES OVERFLOWING...STANDING WATER IN FIELDS...AND AN AVERAGE OF 3 INCHES OF WATER ON ROADWAYS |
| May 25, 2:27 PM CDT | HEAVY RAIN 4 | Edwardsville, IL | TOTAL SINCE MIDNIGHT...CREEKS OBSERVED TO BE OVERFLOWING...MINOR ROAD FLOODING |
| May 25, 2:29 PM CDT | FLOOD | Edwardsville, IL | MADISON COUNTY S.O. RELAYED SEVERAL REPORTS AROUND EDWARDSVILLE AND POINTS NORTH OF WATER FLOWING OVER COUNTY AND SECONDARY ROADS...NO ROADS CLOSED IN THE COUNTY AT THIS TIME DUE TO FLOODING |
| May 25, 2:37 PM CDT | FLOOD | Edwardsville, IL | REPORTED 6 TO 8 INCHES OF WATER FLOWING ACROSS ROADS...WATER STILL RISING |
| May 25, 3:11 PM CDT | FLOOD | Edwardsville, IL | SOME ROADS NEAR DOWNTOWN EDWARDSVILLE ARE IMPASSABLE... 12+ INCHES OF WATER IN LOW SPOTS |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Lincoln, IL (KILX), launched 12:00Z, 4.9 hours before the alert went out and 179 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1131 m above ground
- 0-6 km bulk shear
- 20 kt
- 0-1 km storm-relative helicity
- 42 m²/s²
- 0-3 km storm-relative helicity
- 89 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 WGUS53 KLSX 251655 FFWLSX ILC119-252300- /O.NEW.KLSX.FF.W.0021.090525T1655Z-090525T2300Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE ST LOUIS MO 1155 AM CDT MON MAY 25 2009 THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A * FLASH FLOOD WARNING FOR... CENTRAL MADISON COUNTY IN SOUTHWEST ILLINOIS * UNTIL 600 PM CDT MONDAY * AT 1149 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED SLOW MOVING THUNDERSTORMS WITH VERY HEAVY RAINFALL ACROSS THE WARNED AREA. RADAR ESTIMATES IN EXCESS OF 3 INCHES WERE OBSERVED IN A SMALL AREA JUST EAST OF EDWARDSVILLE. THE CAHOKIA CREEK BASIN HAS BEEN HIT ESPECIALLY HARD. PEOPLE SHOULD EXPECT FLASH FLOODING ALONG CAHOKIA CREEK AND ITS TRIBUTARIES THIS AFTERNOON. * RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE... BETHALTO...EDWARDSVILLE...GLEN CARBON...MARYVILLE...PONTOON BEACH...TROY...WOOD RIVER...ALHAMBRA...CARPENTER...DORSEY... HARTFORD...LIVINGSTON...MARINE...PRAIRIETOWN...ROXANA...AND WORDEN. PRECAUTIONARY/PREPAREDNESS ACTIONS... EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL CREEKS AND STREAMS...URBAN AREAS...HIGHWAYS...STREETS AND UNDERPASSES AS WELL AS OTHER DRAINAGE AREAS AND LOW LYING SPOTS. FLOODING IS OCCURRING OR IS IMMINENT. MOST FLOOD RELATED DEATHS OCCUR IN AUTOMOBILES. DO NOT ATTEMPT TO CROSS WATER COVERED BRIDGES... DIPS...OR LOW WATER CROSSINGS. NEVER TRY TO CROSS A FLOWING STREAM... EVEN A SMALL ONE...ON FOOT OR IN A VEHICLE. TO REPORT FLOODING...HAVE THE NEAREST LAW ENFORCEMENT AGENCY RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST OFFICE IN ST LOUIS. && LAT...LON 3899 8974 3872 8971 3871 9010 3900 9010 $$ CARNEY
2 follow-up statements
000 WGUS73 KLSX 252023 FFSLSX FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE ST LOUIS MO 323 PM CDT MON MAY 25 2009 ILC119-252300- /O.CON.KLSX.FF.W.0021.000000T0000Z-090525T2300Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ MADISON IL- 323 PM CDT MON MAY 25 2009 ...FLASH FLOOD WARNING REMAINS IN EFFECT FOR CENTRAL MADISON COUNTY UNTIL 600 PM CDT... AT 307 PM CDT...DOPPLER RADAR INDICATED THUNDERSTORMS WITH VERY HEAVY RAINFALL ACROSS THE WARNED AREA. DOPPLER RADAR ESTIMATED 2 TO 5 INCHES HAS FALLEN ACROSS THE WARNED ARE SINCE LATE THIS MORNING. THESE ESTIMATES HAVE BEEN VERIFIED BY SPOTTER REPORTS OF 2 TO 4 INCHES. LOCAL LAW ENFORCEMENT REPORTS MANY COUNTY AND SECONDARY ROADS IN AND AROUND THE EDWARDSVILLE ARE AND POINTS NORTHWARD HAVE WATER FLOWING OVER THE ROADWAYS. OTHER REPORTS INDICATE URBAN FLOODING IN PARTS OF EDWARDSVILLE WITH IN EXCESS OF A FOOT OF STANDING WATER NEAR THE DOWNTOWN AREA. SLOW MOVING THUNDERSTORMS ARE PRODUCING VERY HEAVY RAINFALL IN THE WARNED AREA. RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...BETHALTO...EDWARDSVILLE...GLEN CARBON...MARYVILLE...PONTOON BEACH...TROY...WOOD RIVER...ALHAMBRA...CARPENTER...DORSEY... HARTFORD...LIVINGSTON...MARINE...PRAIRIETOWN...ROXANA AND WORDEN. PRECAUTIONARY/PREPAREDNESS ACTIONS... THE CAHOKIA CREEK BASIN CONTINUES TO BE AFFECTED BY THE HEAVY RAINFALL. A GAGE ON CAHOKIA CREEK NEAR EDWARDSVILLE INDICATES THE WATER LEVEL HAS RISEN 15 FEET SINCE THIS MORNING AND IS STILL RISING. ANYBODY ALONG CAHOKIA CREEK OR ITS TRIBUTARIES SHOULD PAY SPECIAL ATTENTION THIS SITUATION FOR THE REST OF THE DAY. DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS SAFELY. DO NOT UNDERESTIMATE THE POWER OF FLOOD WATERS. ONLY A FEW INCHES OF RAPIDLY FLOWING WATER CAN QUICKLY CARRY AWAY YOUR VEHICLE. REPORT FLOODING TO THE NEAREST LAW ENFORCEMENT AGENCY SO THAT THEY MAY TAKE APPROPRIATE ACTION TO CLOSE FLOODED ROADWAYS. THEY WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE IN ST LOUIS. && LAT...LON 3899 8974 3872 8971 3871 9010 3900 9010 $$ MILLER
000 WGUS73 KLSX 252212 FFSLSX FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE ST LOUIS MO 512 PM CDT MON MAY 25 2009 ILC119-252225- /O.CAN.KLSX.FF.W.0021.000000T0000Z-090525T2300Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ MADISON IL- 512 PM CDT MON MAY 25 2009 ...THE FLASH FLOOD WARNING THAT WAS IN EFFECT FOR CENTRAL MADISON COUNTY IS CANCELLED... THE HEAVIEST RAIN PRODUCING THUNDERSTORMS HAVE EXITED THE WARNED AREA REDUCING THE RISK FOR FLASH FLOODING...HOWEVER RUNOFF FROM THE EARLIER RAINFALL WILL CONTINUE THROUGH THE EVENING. IF FLOODING IS OBSERVED...PLEASE REPORT IT TO YOUR LOCAL LAW ENFORCEMENT AGENCY. LAT...LON 3899 8974 3872 8971 3871 9010 3900 9010 $$ MILLER
The office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 25, 11:00 AM CDT | Areal Flood Advisory | LSX | Madison | 6 hr |
| May 25, 1:38 PM CDT | Tornado Warning | LSX | Macoupin | 37 min |
| May 25, 2:16 PM CDT | Tornado Warning | LSX | Madison | 29 min |
| May 25, 3:06 PM CDT | Flash Flood Warning | LSX | Macoupin | 6 hr |
| May 25, 3:34 PM CDT | Areal Flood Advisory | LSX | Bond, Fayette, Montgomery | 6 hr |
| May 25, 5:00 PM CDT | Areal Flood Warning | LSX | Madison | 6 hr |
| May 25, 5:09 PM CDT | Areal Flood Warning | LSX | Madison | 6 hr |
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.