Alert archive / Illinois / Flash Flood Warnings in 1996

Flash Flood Warning 11, NWS St. Louis, MO

April 28, 1996Clinton County, Madison County, Saint Clair County, Illinois

NWS St. Louis, MO issued this flash flood warning at Apr 28, 1996, 7:03 PM CDT for Clinton County, Madison County, Saint Clair 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 counties it named.

The facts

Issued
Apr 28, 1996, 7:03 PM CDT (00:03 UTC)
Expired
Apr 28, 1996, 11:00 PM CDT
In force
4 hr
Issued by
NWS St. Louis, MO
Area
Whole counties

Counties Clinton County, IL, Madison County, IL, Saint Clair County, IL

The radar

The St Louis radar (KLSX), 81 km from the middle of the area, began a volume at 00:06 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.

The nearest sounding before it

Lincoln, IL (KILX), launched 00:00Z, 0.1 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-pSkew-T log-p diagram, Lincoln, IL at 00:00Z on 1996-04-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1 joules per kilogram.LCLEL10008507005003002001001 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 1996-04-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 142 square meters per square second.1939587897Sfc1 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
1 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
477 m above ground
0-6 km bulk shear
71 kt
0-1 km storm-relative helicity
142 m²/s²
0-3 km storm-relative helicity
404 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 
TTAA00 KSTL 290004
FFWSTL
ILC027-119-163-290400-
 
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
703 PM CDT SUN APR 28 1996
 
THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A
FLASH FLOOD WARNING EFFECTIVE UNTIL 1100 PM CDT
FOR PEOPLE IN THE FOLLOWING LOCATIONS...
 
IN SOUTH CENTRAL ILLINOIS
 
   ...CLINTON COUNTY
 
IN SOUTHWEST ILLINOIS
 
   ...MADISON COUNTY...ST. CLAIR COUNTY
 
AT 7 PM...NATIONAL WEATHER SERVICE RADAR WAS DETECTING NUMEROUS
THUNDERSTORMS CONTAINING HEAVY RAINS MOVING EAST NORTHEASTWARD THROUGH
THE ST LOUIS METRO AREA INTO THE COUNTIES OF MADISON...ST CLAIR AND
CLINTON COUNTIES.
 
WITH ALREADY SATURATED GROUNDS AND PONDING OF WATER...THIS ADDITIONAL
HEAVY RAINS WILL PRODUCE FLOODING OF SMALL STREAMS AND LOW LYING AREAS.
WATER WAS ALREADY COVERING PARTS OF US 50 NEAR LEBANON ILLINOIS.  RADAR
WAS ESTIMATING AROUND AN INCH OF RAIN HAS FALLEN DURING THE LAST HOUR.
 
BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE
THE DANGERS OF FLOODING. NEVER DRIVE OR WALK INTO FLOOD WATER.
 
FLASH FLOODING IS THE LEADING WEATHER RELATED KILLER ACROSS THE
UNITED STATES. NEVER UNDERESTIMATE THE POWER OF FLOWING WATER.
MOVE TO HIGLHER GROUND IMMEDIATELY WHEN FLOODING THREATENS. YOUR
LIFE MAY DEPEND ON IT.
 
GKS
&

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 28, 8:20 PM CDTFlash Flood WarningLSXMonroe3 hr
Apr 28, 10:55 PM CDTFlash Flood WarningLSXClinton, Madison, Monroe, Saint Clair, Washington4 hr
Apr 29, 3:01 AM CDTFlash Flood WarningLSXMonroe, Saint Clair3 hr
Apr 29, 3:01 AM CDTFlash Flood WarningLSXClinton, Madison3 hr
Apr 29, 3:01 AM CDTFlash Flood WarningLSXWashington3 hr

Nearby

Flash Flood Warnings in Illinois, 1996Every flash flood warning in 1996

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.