Alert archive / Illinois / Flash Flood Warnings in 2001

Flash Flood Warning 14, NWS St. Louis, MO

August 22, 2001Lewis County, Missouri; Adams County, Brown County, Illinois

NWS St. Louis, MO issued this flash flood warning at Aug 22, 2001, 11:50 PM CDT for Lewis County, Missouri; Adams County, Brown County, 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 counties it named.

The facts

Issued
Aug 22, 2001, 11:50 PM CDT (04:50 UTC)
Expired
Aug 23, 2001, 5:45 AM CDT
In force
6 hr
Issued by
NWS St. Louis, MO
Area
Whole counties

Counties Adams County, IL, Brown County, IL, Lewis County, MO

The radar

The St Louis radar (KLSX), 154 km from the middle of the area, began a volume at 04:50 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, 4.8 hours before the alert went out and 188 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 2001-08-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 494 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, Davenport, at 00:00Z on 2001-08-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 55 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
494 J/kg
Mixed-layer CIN
-57 J/kg
Mixed-layer LCL
1507 m above ground
0-6 km bulk shear
23 kt
0-1 km storm-relative helicity
55 m²/s²
0-3 km storm-relative helicity
77 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.0

Open this sounding in Storm Lab

The text

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

000 
WGUS53 KLSX 230508
FFWSTL
ILC001-009-MOC111-231045-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
1150 PM CDT WED AUG 22 2001

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  LEWIS COUNTY IN NORTHEAST MISSOURI
  ADAMS COUNTY IN WEST CENTRAL ILLINOIS
  BROWN COUNTY IN WEST CENTRAL ILLINOIS

* UNTIL 545 AM CDT

* AT 1150 PM CDT...WEATHER SERVICE DOPPLER RADAR INDICATED 
THUNDERSTORMS INCREASING IN INTENSITY AND COVERAGE OVER EXTREME 
NORTHEAST MISSOURI INTO WEST CENTRAL ILLINOIS. DOPPLER RAINFALL 
ESTIMATES INDICATE 3 TO 5 INCHES OF RAIN HAVE ALREADY FALLEN NORTH 
OF U.S. HIGHWAY 24 IN NORTHERN ADAMS AND BROWN COUNTIES WITH LESSER 
AMOUNTS FURTHER SOUTH. 

THIS STORM COMPLEX HAS BECOME RATHER COMPLICATED AND BACKBUILDING HAS
TAKEN PLACE WITH STORMS REFORMING SLIGHTLY FURTHER WEST IN EXTREME 
NORTHEAST MISSOURI. THE COMPLEX IS ALSO SLIDING SLOWLY SOUTH AND 
WILL INTENSIFY BACK INTO THESE THREE COUNTIES.

COPIOUS AMOUNTS OF RAIN WILL LIKELY FALL IN A SHORT PERIOD OF TIME
WITH RAINFALL TOTALS POSSIBLY REACHING 6 TO 10 INCHES BEFORE 
MORNING. THIS IS A VERY UNUSUAL SITUATION AND PLACES THAT NORMALLY 
DO NOT FLOOD WILL BE SUSCEPTIBLE.

RIVERS INCLUDING BEAR CREEK...SOUTH FORK...AND THE LA MOINE RIVERS 
ALONG WITH ALL SMALLER STREAMS AND TRIBUTARIES WILL EXPERIENCE MAJOR 
RISES OVERNIGHT AND DURING THE DAY THURSDAY.

* FLASH FLOODING CAN BE EXPECTED ACROSS THE AREA...AND WILL BE   
AFFECTING ALL COMMUNITIES ALONG AND NORTH OF ROUTE 24 INCLUDING 
QUINCY AND MT. STERLING IN ILLINOIS AND CANTON...LA GRANGE AND 
MONTICELLO IN MISSOURI.

IF FLASH FLOODING IS OBSERVED OR IMMINENT...MOVE QUICKLY TO HIGHER 
GROUND. NEVER DRIVE INTO AN AREA WHERE WATER COVERS THE ROAD.

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

$$
PEDIGO

Nearby

Flash Flood Warnings in Illinois, 2001Flash Flood Warnings in Missouri, 2001Every flash flood warning in 2001

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.