Alert archive / Illinois / Flash Flood Warnings in 2012
Flash Flood Warning 21, NWS St. Louis, MO
NWS St. Louis, MO issued this flash flood warning at May 20, 2012, 5:06 PM CDT for Marion County, Illinois. It was in force for 4 hr. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- May 20, 2012, 5:06 PM CDT (22:06 UTC)
- Expired
- May 20, 2012, 9:00 PM CDT
- In force
- 4 hr
- Issued by
- NWS St. Louis, MO
- Area
- Storm-based polygon
- Flood severity
- None
County Marion County, IL
The radar
The Evansville,IN radar (KVWX), 115 km from the middle of the area, began a volume at 22:06 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, 10.1 hours before the alert went out and 174 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
- 616 J/kg
- Mixed-layer CIN
- -119 J/kg
- Mixed-layer LCL
- 1773 m above ground
- 0-6 km bulk shear
- 10 kt
- 0-1 km storm-relative helicity
- -67 m²/s²
- 0-3 km storm-relative helicity
- -55 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
759 WGUS53 KLSX 202206 FFWLSX ILC121-210200- /O.NEW.KLSX.FF.W.0021.120520T2206Z-120521T0200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE ST LOUIS MO 506 PM CDT SUN MAY 20 2012 THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A * FLASH FLOOD WARNING FOR... MARION COUNTY IN SOUTH CENTRAL ILLINOIS... * UNTIL 900 PM CDT * AT 506 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED SLOW MOVINGTHUNDERSTORMS WITH VERY HEAVY RAINFALL ACROSS THE WARNED AREA. RADAR ESTIMATES BETWEEN TWO AND THREE INCHES OF RAINFALL HAVE FALLEN OVER PARTS OF WESTERN MARION COUNTY OVER THE PAST HOUR OR TWO...IN THE REGION BETWEEN FAIRMAN AND ODIN. * RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE... CENTRALIA...SALEM...CENTRAL CITY...FAIRMAN...HELM...KINMUNDY... ODIN...OMEGA...PATOKA...SANDOVAL AND STEPHEN FORBES STATE PARK. ADDITIONAL SLOW MOVING AND HEAVY RAIN PRODUCING THUNDERSTORMS ARE EXPECTED IN OTHER SECTIONS OF THE COUNTY AS WELL OVER THE NEXT FEW HOURS. PRECAUTIONARY/PREPAREDNESS ACTIONS... A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING. IF YOU ARE IN THE WARNING AREA MOVE TO HIGHER GROUND IMMEDIATELY. RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE PRECAUTIONS TO PROTECT LIFE AND PROPERTY. DO NOT ATTEMPT TO CROSS SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN DEPTH BY FOOT OR BY AUTOMOBILE. 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. TO REPORT FLOODING...HAVE THE NEAREST LAW ENFORCEMENT AGENCY RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST OFFICE IN ST LOUIS. && LAT...LON 3847 8914 3882 8914 3883 8870 3848 8870 $$ TES
2 follow-up statements
034 WGUS73 KLSX 210029 FFSLSX FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE ST LOUIS MO 729 PM CDT SUN MAY 20 2012 ILC121-210200- /O.CON.KLSX.FF.W.0021.000000T0000Z-120521T0200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ MARION IL- 729 PM CDT SUN MAY 20 2012 ...FLASH FLOOD WARNING REMAINS IN EFFECT FOR MARION COUNTY UNTIL 900 PM CDT... AT 720 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED THUNDERSTORMS WITH VERY HEAVY RAINFALL ACROSS THE WARNED AREA... WHERE ESTIMATES OF UP TO THREE INCHES OF RAINFALL EXIST FOR AREAS SOUTH AND WEST OF SALEM. SPECIFICALLY...BETWEEN THE ODIN AND FAIRMAN AREAS AND THE AREA SOUTH OF SELMAVILLE. REPORTS SO FAR OUT OF MARION COUNTY INDICATE ONLY MINOR FLOOWING FOR THE AREAS TO THE SOUTH AND WEST OF SALEM. HOWEVER...ADDITIONAL HEAVY RAIN PRODUCING THUNDERSTORMS ARE LIKELY HEADING INTO THE MID AND LATE PARTS OF THE EVENING. RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE... CENTRALIA...SALEM...CENTRAL CITY...FAIRMAN...HELM...KINMUNDY... ODIN...OMEGA...PATOKA...SANDOVAL AND STEPHEN FORBES STATE PARK. PRECAUTIONARY/PREPAREDNESS ACTIONS... A FLASH FLOOD WARNING MEANS THAT FLASH FLOODING IS IMMINENT OR OCCURRING. IF YOU ARE IN THE WARNING AREA...MOVE TO HIGHER GROUND IMMEDIATELY. RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE PRECAUTIONS TO PROTECT LIFE AND PROPERTY. DO NOT ATTEMPT TO CROSS SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN DEPTH BY FOOT OR BY AUTOMOBILE. DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS SAFELY. REPORT FLOODING TO THE NEAREST LAW ENFORCEMENT AGENCY SO THAT THEY MAY TAKE APPROPRIATE ACTION TO CLOSE FLOODED ROADWAYS. THEY WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE IN ST LOUIS. && LAT...LON 3847 8914 3882 8914 3883 8870 3848 8870 $$ TES
032 WGUS73 KLSX 210159 FFSLSX FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE ST LOUIS MO 859 PM CDT SUN MAY 20 2012 ILC121-210212- /O.EXP.KLSX.FF.W.0021.000000T0000Z-120521T0200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ MARION IL- 859 PM CDT SUN MAY 20 2012 ...THE FLASH FLOOD WARNING THAT WAS IN EFFECT FOR MARION COUNTY WILL BE ALLOWED TO EXPIRE AT 900 PM CDT... EXCESS RUNOFF FROM HEAVY RAIN HAS ENDED OVER THE WARNED AREA. STREAMS AND CREEKS IN THE WARNED AREA HAVE RECEDED OR WERE BEGINNING TO RECEDE...ENDING THE FLOOD THREAT. IF FLOODING HAS BEEN OBSERVED... PLEASE REPORT IT TO YOUR LOCAL LAW ENFORCEMENT AGENCY. THERE WILL BE SCATTERED THUNDERSTORMS THAT WILL STILL PASS THROUGH THE AREA THROUGH MIDNIGHT...BUT HEAVY RAINFALL WILL BE A MINIMAL THREAT. LAT...LON 3847 8914 3882 8914 3883 8870 3848 8870 $$ TES
The office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 20, 4:18 PM CDT | Severe Thunderstorm Warning | LSX | Greene, Jersey, Macoupin | 27 min |
| May 20, 5:11 PM CDT | Severe Thunderstorm Warning | LSX | Calhoun, Pike | 37 min |
Nearby
Flash Flood Warnings in Illinois, 2012Every flash flood warning in 2012
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.