Alert archive / Illinois / Flash Flood Warnings in 2009

Flash Flood Warning 22, NWS St. Louis, MO

May 25, 2009Macoupin County, Illinois

NWS St. Louis, MO issued this flash flood warning at May 25, 2009, 3:06 PM CDT for Macoupin County, Illinois. It was in force for 6 hr. 3 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
May 25, 2009, 3:06 PM CDT (20:06 UTC)
Expired
May 25, 2009, 9:00 PM CDT
In force
6 hr
Issued by
NWS St. Louis, MO
Area
Storm-based polygon
Flood severity
None

County Macoupin County, IL

The radar

The St Louis radar (KLSX), 87 km from the middle of the area, began a volume at 20:06 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

TimeReportWhereRemark
May 25, 4:00 PM CDTFLASH FLOODBunker Hill, ILMACOUPIN COUNTY S.O. RELAYED INFO THAT ALL ROADS IN AND OUT OF BUNKER HILL WERE CLOSED FOR A WHILE THIS AFTERNOON...BUT ARE NOW OPEN. S.O. ALSO STATED THAT WATER WAS UP TO THE BOTTOM OF VEHICLE DOORS EARLIER BUT BUNKER HILL IS STILL EXPERIENCING FLOODING.
May 25, 4:33 PM CDTHEAVY RAIN 2.582 Wsw Staunton, IL1.76 INCHES IN PAST HOUR...STANDING WATER IN FIELDS AND STREET FLOODING OBSERVED
May 25, 7:50 PM CDTHEAVY RAIN 4.255 Ene Dorsey, IL

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, 8.1 hours before the alert went out and 154 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, Lincoln, IL at 12:00Z on 2009-05-25Temperature 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°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Lincoln, IL at 12:00Z on 2009-05-25The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 42 square meters per square second.1939Sfc1 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
1131 m above ground
0-6 km bulk shear
20 kt
0-1 km storm-relative helicity
42 m²/s²
0-3 km storm-relative helicity
89 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 252006
FFWLSX
ILC117-260200-
/O.NEW.KLSX.FF.W.0022.090525T2006Z-090526T0200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
306 PM CDT MON MAY 25 2009

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SOUTHERN MACOUPIN COUNTY IN SOUTHWEST ILLINOIS

* UNTIL 900 PM CDT

* AT 257 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  SLOW MOVING THUNDERSTORMS WITH VERY HEAVY RAINFALL ACROSS THE      
  WARNED AREA.  RADAR ESTIMATES OF 2 TO 4 INCHES HAVE FALLEN SINCE   
  LATE THIS MORNING.

* RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
  OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  CARLINVILLE...GILLESPIE...STAUNTON...BENLD...BRIGHTON...BUNKER
  HILL...MOUNT OLIVE...SHIPMAN AND WILSONVILLE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

ADDITIONAL RAINFALL AMOUNTS OF 1 TO 2 INCHES ARE POSSIBLE IN
THE WARNED AREA.

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.

A FLASH FLOOD WARNING 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.

TO REPORT FLOODING...HAVE THE NEAREST LAW ENFORCEMENT AGENCY RELAY
YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST OFFICE IN ST
LOUIS.

&&

LAT...LON 3931 8972 3900 8971 3900 9015 3931 9015

$$

MILLER
1 follow-up statement
000 
WGUS73 KLSX 260201
FFSLSX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
801 PM CDT MON MAY 25 2009

ILC117-260214-
/O.EXP.KLSX.FF.W.0022.000000T0000Z-090526T0200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MACOUPIN IL-
801 PM CDT MON MAY 25 2009

...THE FLASH FLOOD WARNING THAT WAS IN EFFECT FOR SOUTHERN MACOUPIN
COUNTY WILL BE ALLOWED TO EXPIRE AT 900 PM 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. IF FLOODING HAS BEEN OBSERVED...PLEASE REPORT IT TO YOUR 
LOCAL LAW ENFORCEMENT AGENCY.

LAT...LON 3931 8972 3900 8971 3900 9015 3931 9015

$$

BRITT

The office that day

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

IssuedProductOfficeCountiesLasted
May 25, 11:00 AM CDTAreal Flood AdvisoryLSXMadison6 hr
May 25, 11:55 AM CDTFlash Flood WarningLSXMadison5 hr
May 25, 1:38 PM CDTTornado WarningLSXMacoupin37 min
May 25, 2:16 PM CDTTornado WarningLSXMadison29 min
May 25, 3:34 PM CDTAreal Flood AdvisoryLSXBond, Fayette, Montgomery6 hr
May 25, 5:00 PM CDTAreal Flood WarningLSXMadison6 hr
May 25, 5:09 PM CDTAreal Flood WarningLSXMadison6 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.