Alert archive / Illinois / Flash Flood Warnings in 2010

Flash Flood Warning 2, NWS St. Louis, MO

April 7, 2010Clinton County, Fayette County, Marion County, Illinois

NWS St. Louis, MO issued this flash flood warning at Apr 7, 2010, 4:46 PM CDT for Clinton County, Fayette County, Marion County, Illinois. It was in force for 6 hr. 5 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: Apr 7, 2010, 4:46 PM CDT (21:46 UTC)
Expired: Apr 7, 2010, 10:30 PM CDT
In force: 6 hr
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Flood severity: None

Counties Clinton County, IL, Fayette County, IL, Marion County, IL

The radar

The Evansville,IN radar (KVWX), 121 km from the middle of the area, began a volume at 21:46 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 7, 5:48 PM CDT	FLASH FLOOD	Farina, IL	TWO FEET OF WATER OVER HIGHWAY 37 IN FARINA.
Apr 7, 9:00 PM CDT	FLASH FLOOD	Salem, IL	WATER HAS RECEEDED ON HIGHWAYS...BUT SECONDARY ROADS REMAIN FLOODED. SOME SECONDARY ROADS WERE WASHED OUT DUE TO FLOODING.
Apr 7, 9:06 PM CDT	FLASH FLOOD	3 E Farina, IL	IOLA ROAD AT 2900E REMAINS FLOODED.
Apr 7, 10:20 PM CDT	FLOOD	Salem, IL	NUMEROUS ROADS REMAINED FLOODED AND CLOSED. THIS INCLUDES SECONDARY ROADS IN SALEM AND RURAL ROADS NORTH OF US HIGHWAY 50.
Apr 7, 10:23 PM CDT	FLOOD	3 E Farina, IL	IOLA ROAD REMAINS FLOODED AND CLOSED.

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, 9.8 hours before the alert went out and 163 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 814 m above ground
0-6 km bulk shear: 82 kt
0-1 km storm-relative helicity: -155 m²/s²
0-3 km storm-relative helicity: -192 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

743 
WGUS53 KLSX 072146
FFWLSX
ILC027-051-121-080330-
/O.NEW.KLSX.FF.W.0002.100407T2146Z-100408T0330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
446 PM CDT WED APR 7 2010

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  EASTERN CLINTON COUNTY IN SOUTH CENTRAL ILLINOIS...
  MARION COUNTY IN SOUTH CENTRAL ILLINOIS...
  SOUTHEASTERN FAYETTE COUNTY IN SOUTH CENTRAL ILLINOIS...

* UNTIL 1030 PM CDT

* AT 437 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  SLOW MOVING THUNDERSTORMS WITH VERY HEAVY RAINFALL ACROSS THE
  WARNED AREA.  RADAR ESTIMATES THAT BETWEEN 2 AND 3 INCHES OF RAIN
  HAS FALLEN FROM EASTERN CLINTON COUNTY THROUGH THE NORTHWEST HALF
  OF MARION COUNTY INTO SOUTHEAST FAYETTE COUNTY. ADDITIONAL
  THUNDERSTORMS WILL CONTINUE TO MOVE ACROSS AREAS THAT HAVE ALREADY
  RECEIVED HEAVY RAINFALL...WITH 1 INCH OF ADDITIONAL RAINFALL
  POSSIBLE BY 6 PM.

* RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
  OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE... 
  BOULDER...FAIRMAN...FARINA...KINMUNDY...OMEGA...PATOKA...
  SANDOVAL...SHATTUC AND STEPHEN FORBES STATE PARK.

AT 439 PM CDT...A SPOTTER REPORTED MANY COUNTRY ROADS ARE FLOODED 
AND CREEKS ARE RAPIDLY RISING ABOUT 8 MILES NORTH OF SALEM.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...COUNTRY ROADS...AS WELL AS FARMLAND ALONG THE
BANKS OF CREEKS AND STREAMS.

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.

&&

LAT...LON 3853 8901 3851 8935 3852 8936 3882 8918
      3898 8881 3892 8880 3892 8870 3868 8870

$$

BRITT

1 follow-up statement

777 
WGUS73 KLSX 080004
FFSLSX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
704 PM CDT WED APR 7 2010

ILC027-051-121-080330-
/O.CON.KLSX.FF.W.0002.000000T0000Z-100408T0330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CLINTON IL-MARION IL-FAYETTE IL-
704 PM CDT WED APR 7 2010

...FLASH FLOOD WARNING REMAINS IN EFFECT FOR SOUTHEASTERN FAYETTE...
MARION AND EASTERN CLINTON COUNTIES UNTIL 1030 PM CDT...

AT 548 PM CDT...WEATHER SPOTTERS REPORTED THAT FLASH FLOODING WAS 
OCCURRING IN FARINA...WHERE TWO FEET OF WATER WAS COVERING HIGHWAY 
37.

AT 702 PM...DOPPLER RADAR INDICATED THAT THE RAIN WAS COMING TO AN 
END OVER THE WARNING AREA. HOWEVER...FLASH FLOODING WILL PERSIST AS 
THE RUNOFF FROM THE HEAVY RAINS EARLIER TODAY CONTINUES.

SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...SALEM...
BOULDER...CENTRAL CITY...FAIRMAN...FARINA...KINMUNDY...ODIN...
OMEGA...PATOKA...SANDOVAL...SHATTUC AND STEPHEN FORBES STATE PARK.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXCESSIVE RUNOFF FROM THIS STORM WILL CAUSE FLOODING OF SMALL CREEKS
AND STREAMS...COUNTRY ROADS...NORMALLY DRY WASHES... AS WELL AS
FARMLAND ALONG THE BANKS OF CREEKS AND STREAMS.

MOST FLOOD RELATED DEATHS OCCUR IN AUTOMOBILES. DO NOT ATTEMPT TO
CROSS BRIDGES...DIPS...OR OTHER LOW SPOTS IF WATER COVERS THE
ROADWAY. NEVER TRY TO CROSS A FLOWING STREAM...EVEN A SMALL ONE...ON
FOOT OR IN A VEHICLE.

IN HILLY TERRAIN...THERE ARE HUNDREDS OF LOW WATER CROSSINGS WHICH
ARE POTENTIALLY DANGEROUS IN HEAVY RAIN. DO NOT ATTEMPT TO TRAVEL
ACROSS FLOODED ROADS. FIND ALTERNATE ROUTES. IT ONLY TAKES A FEW
INCHES OF SWIFTLY FLOWING WATER TO CARRY VEHICLES AWAY.

&&

LAT...LON 3853 8901 3851 8935 3852 8936 3882 8918
      3898 8881 3892 8880 3892 8870 3868 8870

$$

BYRD

The office that day

Everything else NWS St. Louis, MO issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 6, 10:17 PM CDT	River Flood Warning	LSX	Adams	7 days
Apr 7, 2:11 PM CDT	Severe Thunderstorm Warning	LSX	Bond, Madison, Montgomery	34 min
Apr 7, 2:41 PM CDT	Severe Thunderstorm Warning	LSX	Fayette	34 min
Apr 7, 3:11 PM CDT	Severe Thunderstorm Warning	LSX	Randolph	34 min
Apr 7, 3:46 PM CDT	Severe Thunderstorm Warning	LSX	Clinton, Fayette, Marion	44 min

Nearby

Flash Flood Warnings in Illinois, 2010 Every flash flood warning in 2010

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.