Alert archive / Illinois / Flash Flood Warnings in 2008

Flash Flood Warning 36, NWS St. Louis, MO

May 30, 20084 counties in Illinois

NWS St. Louis, MO issued this flash flood warning at May 30, 2008, 11:18 PM CDT for 4 counties in Illinois. 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
May 30, 2008, 11:18 PM CDT (04:18 UTC)
Expired
May 31, 2008, 5:15 AM CDT
In force
6 hr
Issued by
NWS St. Louis, MO
Area
Storm-based polygon
Flood severity
None

Counties Clinton County, IL, Monroe County, IL, Saint Clair County, IL, Washington County, IL

The radar

The St Louis radar (KLSX), 79 km from the middle of the area, began a volume at 04:19 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

Lincoln, IL (KILX), launched 00:00Z, 4.3 hours before the alert went out and 234 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 00:00Z on 2008-05-31Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1830 joules per kilogram.LCLLFCEL10008507005003002001001 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, Lincoln, IL at 00:00Z on 2008-05-31The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 0 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
1830 J/kg
Mixed-layer CIN
-43 J/kg
Mixed-layer LCL
984 m above ground
0-6 km bulk shear
0 kt
0-1 km storm-relative helicity
0 m²/s²
0-3 km storm-relative helicity
0 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 310421
FFWLSX
ILC027-133-163-189-311015-
/O.NEW.KLSX.FF.W.0036.080531T0418Z-080531T1015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
1118 PM CDT FRI MAY 30 2008

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SOUTHWESTERN CLINTON COUNTY IN SOUTH CENTRAL ILLINOIS
  WESTERN WASHINGTON COUNTY IN SOUTH CENTRAL ILLINOIS
  MONROE COUNTY IN SOUTHWEST ILLINOIS
  ST. CLAIR COUNTY IN SOUTHWEST ILLINOIS

* UNTIL 515 AM CDT

* AT 1114 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  THUNDERSTORMS PRODUCING VERY HEAVY RAIN OVER THE WARNED AREA. RADAR
  ESTIMATES HALF AN INCH TO ONE AND A HALF INCHES OF RAIN HAS FALLEN
  SINCE 1030 PM. AN ADDITIONAL 1 TO 2 INCHES IS POSSIBLE IN THE NEXT
  COUPLE OF HOURS.

* FLASH FLOODING CAN BE EXPECTED ACROSS THE AREA...AND WILL BE
  AFFECTING WASHINGTON PARK...TRENTON...SWANSEA...SHILOH...SCOTT
  AFB...OFALLON...NEW MEMPHIS...NEW BADEN...MASCOUTAH...LEBANON...
  GERMANTOWN...FAIRVIEW HEIGHTS...FAIRMONT CITY...EAST ST. LOUIS...
  DUPO...CENTREVILLE...CASEYVILLE...CAHOKIA...BREESE...BELLEVILLE...
  BECKEMEYER...AVISTON AND ALBERS.

A FLASH FLOOD 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.

LAT...LON 3822 8940 3823 9003 3814 9006 3811 9020
      3821 9035 3835 9036 3865 9015 3866 8939
TIME...MOT...LOC 0418Z 180DEG 0KT 3846 8992

$$

BYRD
2 follow-up statements
000 
WGUS73 KLSX 310710
FFSLSX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
207 AM CDT SAT MAY 31 2008

ILC027-133-163-189-311015-
/O.CON.KLSX.FF.W.0036.000000T0000Z-080531T1015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
WASHINGTON IL-MONROE IL-ST. CLAIR IL-CLINTON IL-
207 AM CDT SAT MAY 31 2008

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 515 AM CDT FOR
SOUTHWESTERN CLINTON...ST. CLAIR...MONROE AND WESTERN WASHINGTON
COUNTIES...

AT 205 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR SHOWED A 
STRONG THUNDERSTORM WITH HEAVY RAIN MOVING EAST SOUTHEAST ACROSS 
SOUTHERN ST. CLAIR COUNTY. THE STORM WILL LIKELY MOVE ACROSS EASTERN 
WASHINGTON COUNTY AS WELL. THIS STORM MAY PRODUCE AN ADDITION ONE 
HALF TO ONE INCH OF RAIN. FLOODING WAS REPORTED ON HIGHWAY 140 IN 
NORTHERN MADISON COUNTY EARLIER TONIGHT. 

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO WASHINGTON
PARK...TRENTON...SWANSEA...SHILOH...SCOTT AFB...OFALLON...NEW
MEMPHIS...NEW BADEN...MASCOUTAH...LEBANON...GERMANTOWN...FAIRVIEW
HEIGHTS...EAST ST. LOUIS...DUPO...CENTREVILLE...CASEYVILLE...
CAHOKIA...BREESE...BELLEVILLE...BECKEMEYER...AVISTON AND ALBERS.

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING. IF FLASH FLOODING IS OBSERVED ACT QUICKLY. MOVE
UP TO HIGHER GROUND TO ESCAPE FLOOD WATERS. DO NOT STAY IN AREAS
SUBJECT TO FLOODING WHEN WATER BEGINS RISING.

LAT...LON 3822 8940 3823 9003 3814 9006 3811 9020
      3821 9035 3835 9036 3865 9015 3866 8939
TIME...MOT...LOC 0707Z 180DEG 0KT 3846 8992

$$

JPK
000 
WGUS73 KLSX 311021
FFSLSX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
520 AM CDT SAT MAY 31 2008

ILC027-133-163-189-311030-
/O.EXP.KLSX.FF.W.0036.000000T0000Z-080531T1015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
WASHINGTON IL-MONROE IL-ST. CLAIR IL-CLINTON IL-
520 AM CDT SAT MAY 31 2008

...THE FLASH FLOOD WARNING HAS EXPIRED FOR SOUTHWESTERN CLINTON...ST.
CLAIR...MONROE AND WESTERN WASHINGTON COUNTIES...

THE RAIN HAS MOVED OUT OF THE AREA AND THERE HAVE BEEN NO FURTHER 
REPORTS OF FLOODING. 

MOTORISTS SHOULD USE CAUTION WHEN APPROACHING AREAS THAT EXPERIENCED
HIGH WATER LEVELS...AS THE FAST FLOWING WATER MAY HAVE DAMAGED 
ROADWAYS AND BRIDGES AND MAY HAVE LEFT BEHIND DANGEROUS DEBRIS. 

LAT...LON 3822 8940 3823 9003 3814 9006 3811 9020
      3821 9035 3835 9036 3865 9015 3866 8939
TIME...MOT...LOC 0710Z 180DEG 0KT 3846 8992

$$

JPK

The office that day

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

IssuedProductOfficeCountiesLasted
May 30, 7:29 PM CDTSevere Thunderstorm WarningLSXCalhoun, Greene, Jersey31 min
May 30, 7:38 PM CDTTornado WarningLSXMontgomery37 min
May 30, 7:57 PM CDTSevere Thunderstorm WarningLSXCalhoun, Greene, Jersey48 min
May 30, 8:25 PM CDTSevere Thunderstorm WarningLSXJersey, Macoupin, Madison50 min
May 30, 8:45 PM CDTSevere Thunderstorm WarningLSXCalhoun, Jersey45 min
May 30, 9:11 PM CDTSevere Thunderstorm WarningLSXBond, Macoupin, Madison, Montgomery49 min
May 30, 9:19 PM CDTSevere Thunderstorm WarningLSXBond, Madison41 min
May 30, 9:51 PM CDTFlash Flood WarningLSXCalhoun, Jersey, Madison6 hr
May 30, 9:58 PM CDTSevere Thunderstorm WarningLSXBond, Clinton, Fayette, Madison47 min
May 30, 10:21 PM CDTSevere Thunderstorm WarningLSXMadison, Monroe, Saint Clair39 min
May 30, 10:56 PM CDTSevere Thunderstorm WarningLSXClinton, Saint Clair, Washington49 min
May 31, 6:01 PM CDTSevere Thunderstorm WarningLSXBond, Clinton, Fayette, Macoupin, Madison, Montgomery44 min
May 31, 6:03 PM CDTSevere Thunderstorm WarningLSXMarion27 min
May 31, 6:08 PM CDTSevere Thunderstorm WarningLSXCalhoun52 min
May 31, 6:40 PM CDTSevere Thunderstorm WarningLSXCalhoun, Jersey, Macoupin, Madison50 min
May 31, 6:44 PM CDTSevere Thunderstorm WarningLSXBond, Clinton, Fayette, Marion40 min

Nearby

Flash Flood Warnings in Illinois, 2008Every flash flood warning in 2008

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.