Alert archive / Illinois / Flash Flood Warnings in 2009
Flash Flood Warning 41, NWS St. Louis, MO
NWS St. Louis, MO issued this flash flood warning at Jun 10, 2009, 8:58 PM CDT for Monroe County, Saint Clair County, 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
- Jun 10, 2009, 8:58 PM CDT (01:58 UTC)
- Expired
- Jun 11, 2009, 3:00 AM CDT
- In force
- 6 hr
- Issued by
- NWS St. Louis, MO
- Area
- Storm-based polygon
- Flood severity
- None
Counties Monroe County, IL, Saint Clair County, IL
The radar
The St Louis radar (KLSX), 61 km from the middle of the area, began a volume at 01:58 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 |
|---|---|---|---|
| Jun 10, 10:16 PM CDT | FLASH FLOOD | Mascoutah, IL | 6 INCHES OF WATER FLOWING ACROSS HIGHWAY 177 AND HIGHWAY 4 IN MASCOUTAH. |
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 241 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
- 729 J/kg
- Mixed-layer CIN
- -30 J/kg
- Mixed-layer LCL
- 1199 m above ground
- 0-6 km bulk shear
- 39 kt
- 0-1 km storm-relative helicity
- 32 m²/s²
- 0-3 km storm-relative helicity
- 111 m²/s²
- Significant tornado parameter
- 0.2
- Supercell composite
- 2.4
The text
As transmitted, in the capitals the NWS used until 2016.
000
WGUS53 KLSX 110158
FFWLSX
ILC133-163-110800-
/O.NEW.KLSX.FF.W.0041.090611T0158Z-090611T0800Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
858 PM CDT WED JUN 10 2009
THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A
* FLASH FLOOD WARNING FOR...
MONROE COUNTY IN SOUTHWEST ILLINOIS
ST. CLAIR COUNTY IN SOUTHWEST ILLINOIS
* UNTIL 300 AM CDT THURSDAY
* AT 856 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
SLOW MOVING THUNDERSTORMS WITH VERY HEAVY RAINFALL ACROSS THE
WARNED AREA. 1 TO LOCALLY 4 INCHES OF RAINFALL IS EXPECTED WITH
THIS THUNDERSTORM COMPLEX WHICH WILL LIKELY LEAD TO FLASH
FLOODING.
* RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
BELLEVILLE...CAHOKIA...CASEYVILLE...CENTREVILLE...COLUMBIA...
DUPO...EAST ST. LOUIS...FAIRVIEW HEIGHTS...FREEBURG...LEBANON...
MASCOUTAH...MILLSTADT...OFALLON...SCOTT AFB...SHILOH...SWANSEA...
WASHINGTON PARK...WATERLOO...BROOKLYN...EAST CARONDELET...FAIRMONT
CITY...FOUNTAIN...MARISSA...NEW ATHENS...NEW DESIGN...SMITHTON AND
VALMEYER.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING. IF FLASH FLOODING IS OBSERVED ACT QUICKLY. DO
NOT ENTER THE WATER. TURN AROUND AND MOVE UP TO HIGHER GROUND TO
ESCAPE FLOOD WATERS. DO NOT STAY IN AREAS SUBJECT TO FLOODING WHEN
WATER BEGINS RISING.
&&
LAT...LON 3822 9004 3814 9004 3809 9021 3815 9028
3821 9035 3829 9038 3837 9036 3844 9029
3855 9025 3861 9018 3866 9018 3866 8971
3822 8971
$$
CVKING1 follow-up statement
000
WGUS73 KLSX 110444
FFSLSX
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
1144 PM CDT WED JUN 10 2009
ILC133-163-110800-
/O.CON.KLSX.FF.W.0041.000000T0000Z-090611T0800Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MONROE IL-ST. CLAIR IL-
1144 PM CDT WED JUN 10 2009
...FLASH FLOOD WARNING REMAINS IN EFFECT FOR ST. CLAIR AND MONROE
COUNTIES UNTIL 300 AM CDT...
ALTHOUGH THE THUNDERSTORMS AND RAINFALL HAVE ENDED...WIDESPREAD
RAINFALL AMUNTS OF 1 TO 2 INCHES WITH LOCALIZED AMOUNTS OF UP TO 4
INCHES WITH THE MAJORITY OF IT FALLING WITHIN AN HOUR WILL CONTINUE
TO RUN OFF TONIGHT KEEPING CREEKS AND STREAMS RUNNING HIGH.
SLOW MOVING THUNDERSTORMS ARE PRODUCING VERY HEAVY RAINFALL IN THE
WARNED AREA. RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH
FLOODING TO OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING
INCLUDE...BELLEVILLE...CAHOKIA...CASEYVILLE...CENTREVILLE...
COLUMBIA...DUPO...EAST ST. LOUIS...FAIRVIEW HEIGHTS...FREEBURG...
LEBANON...MASCOUTAH...MILLSTADT...OFALLON...SCOTT AFB...SHILOH...
SWANSEA...WASHINGTON PARK...WATERLOO...BROOKLYN...EAST CARONDELET...
FAIRMONT CITY...FOUNTAIN...MARISSA...NEW ATHENS...NEW DESIGN...
SMITHTON AND VALMEYER.
AT 1015 PM...AN AMATEUR RADIO OPERATOR REPORTED 6 INCHES OF WATER
FLOWING OVER THE INTERSECTION OF ILLINOIS HIGHWAYS 177 AND 4 IN
MASCOUTAH.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING. IF FLOODING IS OBSERVED...ACT QUICKLY. DO NOT
ENTER THE WATER. TURN AROUND AND MOVE UP TO HIGHER GROUND. DO NOT
STAY IN AREAS SUBJECT TO FLOODING WHEN WATER BEGINS RISING.
DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY.
&&
LAT...LON 3822 9004 3814 9004 3809 9021 3815 9028
3821 9035 3829 9038 3837 9036 3844 9029
3855 9025 3861 9018 3866 9018 3866 8971
3822 8971
$$
MILLERThe office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 10, 8:27 PM CDT | Severe Thunderstorm Warning | LSX | Saint Clair | 37 min |
| Jun 10, 8:31 PM CDT | Severe Thunderstorm Warning | LSX | Monroe, Saint Clair | 44 min |
| Jun 10, 9:53 PM CDT | Severe Thunderstorm Warning | LSX | Saint Clair | 24 min |
| Jun 10, 10:02 PM CDT | Tornado Warning | LSX | Fayette | 28 min |
| Jun 11, 3:08 AM CDT | Areal Flood Warning | LSX | Saint Clair | 6 hr |
| Jun 11, 11:05 AM CDT | River Flood Warning | LSX | Calhoun, Jersey | 71 hr |
| Jun 11, 2:20 PM CDT | Areal Flood Advisory | LSX | Montgomery | 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.