Alert archive / Illinois / Flash Flood Warnings in 2011
Flash Flood Warning 19, NWS St. Louis, MO
NWS St. Louis, MO issued this flash flood warning at Apr 25, 2011, 9:00 PM CDT for 6 counties in Illinois. It was in force for 6 hr. 1 report 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
- Apr 25, 2011, 9:00 PM CDT (02:00 UTC)
- Expired
- Apr 26, 2011, 3:00 AM CDT
- In force
- 6 hr
- Issued by
- NWS St. Louis, MO
- Area
- Storm-based polygon
- Flood severity
- None
Counties Bond County, IL, Clinton County, IL, Fayette County, IL, Madison County, IL, Marion County, IL, Montgomery County, IL
The radar
The Lincoln radar (KILX), 128 km from the middle of the area, began a volume at 02:04 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 |
|---|---|---|---|
| Apr 26, 2:21 AM CDT | FLASH FLOOD | Vandalia, IL | MANY ROADS ACROSS THE COUNTY AFFECTED BY HIGH WATER |
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 00:00Z, 2.0 hours before the alert went out and 131 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
- 48 J/kg
- Mixed-layer CIN
- 0 J/kg
- Mixed-layer LCL
- 580 m above ground
- 0-6 km bulk shear
- 36 kt
- 0-1 km storm-relative helicity
- 83 m²/s²
- 0-3 km storm-relative helicity
- 159 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted, in the capitals the NWS used until 2016.
013
WGUS53 KLSX 260200
FFWLSX
ILC005-027-051-119-121-135-260800-
/O.NEW.KLSX.FF.W.0019.110426T0200Z-110426T0800Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
900 PM CDT MON APR 25 2011
THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A
* FLASH FLOOD WARNING FOR...
BOND COUNTY IN SOUTH CENTRAL ILLINOIS...
EXTREME SOUTHEASTERN MADISON COUNTY IN SOUTHWEST ILLINOIS...
FAYETTE COUNTY IN SOUTH CENTRAL ILLINOIS...
NORTHERN CLINTON COUNTY IN SOUTH CENTRAL ILLINOIS...
NORTHWESTERN MARION COUNTY IN SOUTH CENTRAL ILLINOIS...
SOUTHEASTERN MONTGOMERY COUNTY IN SOUTH CENTRAL ILLINOIS...
* UNTIL 300 AM CDT TUESDAY
* AT 858 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
SLOW MOVING THUNDERSTORMS WITH VERY HEAVY RAINFALL ACROSS THE
WARNED AREA. STANDING WATER WAS REPORTED ON SOME ROADS AND
AN ADDITIONAL 1 TO 2 INCHES OF RAIN IS EXPECTED...WHICH WILL
AGGRAVATE CURRENT CONDITIONS.
* RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
BREESE...CARLYLE...GREENVILLE...HILLSBORO...NOKOMIS...VANDALIA...
ALBERS...AVISTON...BEAVER CREEK...BECKEMEYER...BOULDER...
BROWNSTOWN...COFFEEN...FARINA...JAMESTOWN...MULBERRY GROVE...
PATOKA...POCAHONTAS...RAMSEY...RENO...SHOBONIER...SORENTO...ST.
ELMO...ST. ROSE...TAMALCO...TAYLOR SPRINGS...VAN BURENSBURG...
WITT...WOBURN AND WRIGHTS CORNER.
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.
&&
LAT...LON 3884 8870 3852 8967 3935 8953 3936 8914
3922 8913 3922 8881 3892 8881 3892 8870
$$
GLASS1 follow-up statement
934
WGUS73 KLSX 260755
FFSLSX
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
255 AM CDT TUE APR 26 2011
ILC005-027-051-119-121-135-260809-
/O.EXP.KLSX.FF.W.0019.000000T0000Z-110426T0800Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MONTGOMERY IL-CLINTON IL-MARION IL-MADISON IL-BOND IL-FAYETTE IL-
255 AM CDT TUE APR 26 2011
...THE FLASH FLOOD WARNING THAT WAS IN EFFECT FOR FAYETTE...BOND...
EXTREME SOUTHEASTERN MADISON...NORTHWESTERN MARION...NORTHERN CLINTON
AND SOUTHEASTERN MONTGOMERY COUNTIES WILL BE ALLOWED TO EXPIRE AT 300
AM CDT...
THE HEAVY RAIN HAS ENDED OVER THE WARNED AREA. STREAMS AND CREEKS IN
THE WARNED AREA WILL CONTINUE TO CAUSE MINOR FLOODING...BUT LIFE
THREATENING FLASH FLOODING IS NOT EXPECTED TO OCCUR.
LAT...LON 3884 8870 3852 8967 3935 8953 3936 8914
3922 8913 3922 8881 3892 8881 3892 8870
$$
CVKINGThe office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 25, 7:23 PM CDT | Flash Flood Warning | LSX | Clinton, Marion, Monroe, Randolph, Saint Clair, Washington | 9 hr |
| Apr 25, 7:47 PM CDT | Severe Thunderstorm Warning | LSX | Washington | 28 min |
| Apr 26, 4:50 AM CDT | Areal Flood Warning | LSX | Clinton, Marion, Monroe, Randolph, Saint Clair, Washington | 30 hr |
Nearby
Flash Flood Warnings in Illinois, 2011Every flash flood warning 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.