Alert archive / Illinois / Flash Flood Warnings in 2011

Flash Flood Warning 3, NWS St. Louis, MO

April 9, 2011Adams County, Illinois; Marion County, Missouri

NWS St. Louis, MO issued this flash flood warning at Apr 9, 2011, 2:46 AM CDT for Adams County, Illinois; Marion County, Missouri. It was in force for 6 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
Apr 9, 2011, 2:46 AM CDT (07:46 UTC)
Expired
Apr 9, 2011, 8:36 AM CDT
In force
6 hr
Issued by
NWS St. Louis, MO
Area
Storm-based polygon
Flood severity
None

Counties Adams County, IL, Marion County, MO

The radar

The St Louis radar (KLSX), 143 km from the middle of the area, began a volume at 07:46 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.

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 7.8 hours before the alert went out and 206 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-pSkew-T log-p diagram, Davenport, at 00:00Z on 2011-04-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Davenport, at 00:00Z on 2011-04-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 40 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
551 m above ground
0-6 km bulk shear
51 kt
0-1 km storm-relative helicity
40 m²/s²
0-3 km storm-relative helicity
170 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.

666 
WGUS53 KLSX 090746
FFWLSX
ILC001-MOC127-091400-
/O.NEW.KLSX.FF.W.0003.110409T0746Z-110409T1400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
246 AM CDT SAT APR 9 2011

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  EASTERN MARION COUNTY IN NORTHEAST MISSOURI...
  SOUTHERN ADAMS COUNTY IN WEST CENTRAL ILLINOIS...

* UNTIL 900 AM CDT

* AT 246 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  SLOW MOVING THUNDERSTORMS WITH VERY HEAVY RAINFALL ACROSS THE   
  WARNED AREA. ONE INCH OF RAINFALL HAS ALREADY FALLEN WITHIN THE 
  PAST HOUR...WITH ANOTHER ONE TO TWO INCHES POSSIBLE.

* RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
  OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...  
  PALMYRA...QUINCY...BEVERLY...FALL CREEK AND PAYSON.

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.

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 3997 9092 3977 9092 3976 9137 3971 9171
      3995 9172 3995 9165 3995 9145

$$

TILLY
2 follow-up statements
519 
WGUS73 KLSX 091033
FFSLSX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
533 AM CDT SAT APR 9 2011

ILC001-MOC127-091400-
/O.CON.KLSX.FF.W.0003.000000T0000Z-110409T1400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
ADAMS IL-MARION MO-
533 AM CDT SAT APR 9 2011

...FLASH FLOOD WARNING REMAINS IN EFFECT FOR EASTERN MARION AND
SOUTHERN ADAMS COUNTIES UNTIL 900 AM CDT...

AT 532 AM CDT...RUNOFF FROM THUNDERSTORMS DURING THE OVERNIGHT HOURS 
WILL CONTINUE PRODUCE FLASH FLOODING EARLY THIS MORNING ACROSS THE 
WARNED AREA.

SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...PALMYRA...
QUINCY...BEVERLY...FALL CREEK AND PAYSON.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 3997 9092 3977 9092 3976 9137 3971 9171
      3995 9172 3995 9165 3995 9145

$$

MILLER
576 
WGUS73 KLSX 091336
FFSLSX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
836 AM CDT SAT APR 9 2011

ILC001-MOC127-091349-
/O.CAN.KLSX.FF.W.0003.000000T0000Z-110409T1400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
ADAMS IL-MARION MO-
836 AM CDT SAT APR 9 2011

...THE FLASH FLOOD WARNING THAT WAS IN EFFECT FOR EASTERN MARION AND
SOUTHERN ADAMS COUNTIES IS CANCELLED...

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 3997 9092 3977 9092 3976 9137 3971 9171
      3995 9172 3995 9165 3995 9145

$$

BRITT

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 9, 3:00 AM CDTSevere Thunderstorm WarningLSXAdams, Pike33 min
Apr 9, 3:44 AM CDTSevere Thunderstorm WarningLSXCalhoun, Pike31 min
Apr 9, 4:19 AM CDTSevere Thunderstorm WarningLSXCalhoun, Jersey26 min
Apr 9, 5:08 AM CDTSevere Thunderstorm WarningLSXJersey, Madison22 min
Apr 9, 5:21 AM CDTSevere Thunderstorm WarningLSXFayette, Montgomery39 min
Apr 9, 5:25 AM CDTSevere Thunderstorm WarningLSXMacoupin, Madison35 min
Apr 9, 5:41 AM CDTSevere Thunderstorm WarningLSXBond, Madison49 min
Apr 9, 5:44 AM CDTAreal Flood AdvisoryLSXCalhoun, Jersey, Macoupin, Madison3 hr
Apr 9, 6:43 AM CDTSevere Thunderstorm WarningLSXFayette, Marion32 min
Apr 9, 10:42 AM CDTRiver Flood WarningLSXAdams32 days
Apr 9, 1:42 AM CDTFlash Flood WarningLSXMarion, Shelby6 hr
Apr 9, 5:04 AM CDTSevere Thunderstorm WarningLSXIron, Madison, Reynolds, Saint Francois41 min

Nearby

Flash Flood Warnings in Illinois, 2011Flash Flood Warnings in Missouri, 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.