Alert archive / Illinois / Flash Flood Warnings in 2008

Flash Flood Warning 93, NWS St. Louis, MO

August 5, 2008Jersey County, Macoupin County, Illinois

NWS St. Louis, MO issued this flash flood warning at Aug 5, 2008, 9:42 PM CDT for Jersey County, Macoupin County, Illinois. It was in force for 4 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
Aug 5, 2008, 9:42 PM CDT (02:42 UTC)
Expired
Aug 6, 2008, 1:45 AM CDT
In force
4 hr
Issued by
NWS St. Louis, MO
Area
Storm-based polygon
Flood severity
None

Counties Jersey County, IL, Macoupin County, IL

The radar

The St Louis radar (KLSX), 65 km from the middle of the area, began a volume at 02:44 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, 2.7 hours before the alert went out and 176 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 2008-08-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1853 joules per kilogram.LCLLFCEL10008507005003002001001 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 00:00Z on 2008-08-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 60 square meters per square second.193958Sfc1 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
1853 J/kg
Mixed-layer CIN
-52 J/kg
Mixed-layer LCL
949 m above ground
0-6 km bulk shear
39 kt
0-1 km storm-relative helicity
60 m²/s²
0-3 km storm-relative helicity
69 m²/s²
Significant tornado parameter
0.5
Supercell composite
4.5

Open this sounding in Storm Lab

The text

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

000 
WGUS53 KLSX 060242
FFWLSX
ILC083-117-060645-
/O.NEW.KLSX.FF.W.0093.080806T0242Z-080806T0645Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
942 PM CDT TUE AUG 5 2008

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  EASTERN JERSEY COUNTY IN SOUTHWEST ILLINOIS
  SOUTHWESTERN MACOUPIN COUNTY IN SOUTHWEST ILLINOIS

* UNTIL 145 AM CDT

* AT 930 PM CDT...MACOUPIN COUNTY EMERGENCY MANAGEMENT AGENCY
  REPORTED THAT HIGHWAY 111 WAS CLOSED ABOUT 4 MILES SOUTH OF PIASA
  DUE TO FLOODING.   RADAR ESTIMATED THAT OVER 2 INCHES OF RAIN
  FELL IN THIS AREA EARLIR TUESDAY EVENING.

* FLASH FLOODING CAN BE EXPECTED ACROSS THE AREA...AND WILL BE   
AFFECTING MEDORA...PIASA...AND FIDELITY.

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.

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. MOVE TO HIGHER GROUND.

LAT...LON 3905 8999 3904 9033 3918 9033 3918 9032
      3918 8999

$$

TRUETT
1 follow-up statement
000 
WGUS73 KLSX 060641
FFSLSX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
141 AM CDT WED AUG 6 2008

ILC083-117-060651-
/O.EXP.KLSX.FF.W.0093.000000T0000Z-080806T0645Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
JERSEY IL-MACOUPIN IL-
141 AM CDT WED AUG 6 2008

...THE FLASH FLOOD WARNING WILL EXPIRE AT 145 AM CDT FOR SOUTHWESTERN
MACOUPIN AND EASTERN JERSEY COUNTIES...

A CHECK WITH AREA LAW ENFORCEMENT INDICATES THAT FLOODING IS NO
LONGER A PROBLEM IN THE AREA.

LAT...LON 3905 8999 3904 9033 3918 9033 3918 9032
      3918 8999

$$

TES

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 5, 7:06 PM CDTTornado WarningLSXBond, Fayette, Montgomery39 min
Aug 5, 7:09 PM CDTSevere Thunderstorm WarningLSXFayette, Montgomery51 min
Aug 5, 7:33 PM CDTSevere Thunderstorm WarningLSXFayette, Marion42 min
Aug 5, 7:43 PM CDTTornado WarningLSXFayette17 min
Aug 5, 7:47 PM CDTSevere Thunderstorm WarningLSXMonroe, Saint Clair, Washington13 min
Aug 5, 7:56 PM CDTSevere Thunderstorm WarningLSXBond, Clinton, Fayette, Madison, Marion, Monroe and 3 more64 min
Aug 5, 8:18 PM CDTSevere Thunderstorm WarningLSXMonroe42 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.