Alert archive / Illinois / Flash Flood Warnings in 2009

Flash Flood Warning 55, NWS St. Louis, MO

July 5, 2009Clinton County, Illinois

NWS St. Louis, MO issued this flash flood warning at Jul 5, 2009, 12:53 AM CDT for Clinton 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: Jul 5, 2009, 12:53 AM CDT (05:53 UTC)
Expired: Jul 5, 2009, 7:00 AM CDT
In force: 6 hr
Issued by: NWS St. Louis, MO
Area: Storm-based polygon
Flood severity: None

County Clinton County, IL

The radar

The St Louis radar (KLSX), 108 km from the middle of the area, began a volume at 05:55 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
Jul 5, 2:45 AM CDT	FLASH FLOOD	Breese, IL	CLINTON COUNTY SHERIFF DEPT REPORTS WATER OVER MANY ROADS IN THE COUNTY

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, 5.9 hours before the alert went out and 195 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: 466 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 67 m²/s²
0-3 km storm-relative helicity: 117 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.

000 
WGUS53 KLSX 050553
FFWLSX
ILC027-051200-
/O.NEW.KLSX.FF.W.0055.090705T0553Z-090705T1200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
1253 AM CDT SUN JUL 5 2009

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  CLINTON COUNTY IN SOUTH CENTRAL ILLINOIS...

* UNTIL 700 AM CDT

* AT 1249 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  SLOW MOVING THUNDERSTORMS WITH VERY HEAVY RAINFALL ACROSS THE      
  WARNED AREA. DOPPLER RADAR ESTIMATED THAT UP TO 2 AND 1/2 INCHES   
  OF RAIN HAD FALLEN SINCE MIDNIGHT OVER CENTRAL CLINTON             
  COUNTY...AND ADDITIONAL HEAVY RAINFALL IS EXPECTED TO CONTINUE     
  THROUGH 200 AM.

* RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
  OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  BREESE...CARLYLE...NEW BADEN...ALBERS...AVISTON...BECKEMEYER...
  GERMANTOWN...NEW MEMPHIS...SHATTUC...ST. ROSE AND TRENTON.

SOME OF THE MOST IMPACTED STREAM BASINS ARE SUGAR CREEK...SHOAL 
CREEK...BEAVER CREEK...LAKE BRANCH...AND SPANKER BRANCH.

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.

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 3850 8915 3851 8934 3851 8935 3849 8939
      3849 8946 3846 8948 3848 8957 3847 8962
      3843 8967 3842 8971 3865 8971 3866 8960
      3871 8959 3861 8915

$$

CARNEY

2 follow-up statements

000 
WGUS73 KLSX 050752
FFSLSX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
252 AM CDT SUN JUL 5 2009

ILC027-051200-
/O.CON.KLSX.FF.W.0055.000000T0000Z-090705T1200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CLINTON IL-
252 AM CDT SUN JUL 5 2009

...FLASH FLOOD WARNING FOR REMAINS IN EFFECT FOR CLINTON COUNTY UNTIL
700 AM CDT...

AT 245 AM CDT...LAW ENFORCEMENT REPORTED FLOODING ACROSS THE 
COUNTY.  MANY ROADS HAD WATER OVER THEM...AND SOME ROADS MAY BE 
IMPASSIBLE.  DRIVERS ARE URGED TO BE VERY CAUTIOUS.  DO NOT ATTEMPT 
TO CROSS WATER COVERED ROADS.  TURN AROUND AND FIND ANOTHER ROUTE.

RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CONTINUE TO CAUSE FLASH 
FLOODING EVEN THOUGH THE HEAVY RAIN HAS ENDED. SOME LOCATIONS 
THAT WILL EXPERIENCE FLOODING INCLUDE...BREESE...CARLYLE...NEW 
BADEN...ALBERS...AVISTON...BECKEMEYER...GERMANTOWN...NEW 
MEMPHIS...SHATTUC...ST. ROSE AND TRENTON.

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.

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.

&&

LAT...LON 3850 8915 3851 8934 3851 8935 3849 8939
      3849 8946 3846 8948 3848 8957 3847 8962
      3843 8967 3842 8971 3865 8971 3866 8960
      3871 8959 3861 8915

$$

CARNEY

000 
WGUS73 KLSX 051151
FFSLSX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
651 AM CDT SUN JUL 5 2009

ILC027-051205-
/O.EXP.KLSX.FF.W.0055.000000T0000Z-090705T1200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CLINTON IL-
651 AM CDT SUN JUL 5 2009

...THE FLASH FLOOD WARNING THAT WAS IN EFFECT FOR CLINTON COUNTY WILL
BE ALLOWED TO EXPIRE AT 700 AM 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.

LAT...LON 3850 8915 3851 8934 3851 8935 3849 8939
      3849 8946 3846 8948 3848 8957 3847 8962
      3843 8967 3842 8971 3865 8971 3866 8960
      3871 8959 3861 8915

$$

CARNEY

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 5, 12:20 AM CDT	Areal Flood Advisory	LSX	Clinton, Madison, Saint Clair	6 hr

Nearby

Flash Flood Warnings in Illinois, 2009 Every 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.