Alert archive / Illinois / Flash Flood Warnings in 1986

Flash Flood Warning 10, NWS St. Louis, MO

September 18, 1986Perry County, Randolph County, Illinois

NWS St. Louis, MO issued this flash flood warning at Sep 18, 1986, 9:45 AM CDT for Perry County, Randolph County, Illinois. It was in force for 3 hr.

The area

The counties it named.

The facts

Issued
Sep 18, 1986, 9:45 AM CDT (14:45 UTC)
Expired
Sep 18, 1986, 1:00 PM CDT
In force
3 hr
Issued by
NWS St. Louis, MO
Area
Whole counties

Counties Perry County, IL, Randolph County, IL

The radar

The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.

The nearest sounding before it

Salem-Leckrone, IL (KSLO), launched 12:00Z, 2.8 hours before the alert went out and 89 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, Salem-Leckrone, IL at 12:00Z on 1986-09-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 106 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, Salem-Leckrone, IL at 12:00Z on 1986-09-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 21 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
106 J/kg
Mixed-layer CIN
-114 J/kg
Mixed-layer LCL
620 m above ground
0-6 km bulk shear
27 kt
0-1 km storm-relative helicity
21 m²/s²
0-3 km storm-relative helicity
-34 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.3

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KSTL 181445
FFWSTL
ILC145-157-181800-

BULLETIN - EBS ACTIVATION AND IMMEDIATE BROADCAST REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
945 AM CDT THU SEP 18 1986

THE NATIONAL WEATHER SERVICE HAS ISSUED A FLASH FLOOD WARNING
EFFECTIVE UNTIL 100 PM CDT FOR THE FOLLOWING COUNTIES OF

SOUTHWEST ILLINOIS... PERRY... RANDOLPH

HEAVY RAIN WAS INDICATED OVER THE WARNED COUNTIES AT 945 AM.  NEARLY
8 INCHES OF RAIN FELL AT CHESTER ILLINOIS DURI[NG THE PAST 24 HOURS.
ROADS ARE FLOODING AND SMALLER SMALLER CREEKS ARE RISING RAPIDLY.

FLASH FLOODING IS IMMINENT IN THIS AREA.  IF YOU LIVE
ALONG THESE RIVERS AND STREAMS...YOU SHOULD GO TO SAFETY IMMEDIATELY.

What forecasters said that day

The local office's own words before this flash flood warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

In the hours before

Special weather statement, Sep 18, 4:20 AM CDT, 5 hours 25 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
410 AM CDT THU SEP 18 1986

...FLOODING APPEARS IMMINENT JUST SOUTH OF ST LOUIS...
...FLASH FLOOD WARNINGS CONTINUE FOR FOUR COUNTIES IN EAST CENTRAL
MISSOURI AND SOUTHWEST ILLINOIS...

AT 355 AM...THUNDERSTORMS CONTINUED TO LIE IN A NARROW EAST-WEST
LINE FROM 50 MILES WEST SOUTHWEST OF ST LOUIS TO 75 MILES SOUTHEAST
OF ST LOUIS.

FLASH FLOOD WARNINGS REMAIN IN EFFECT FOR AT LEAST PORTIONS OF
FRANKLIN AND JEFFERSON COUNTIES IN MISSOURI AND MONROE AND ST. CLAIR
COUNTIES IN ILLINOIS.

HEAVY RAINS HAVE CONTINUED FOR UP TO SEVEN HOURS IN PORTIONS OF THESE
COUNTIES AND WILL LIKELY CONTINUE UNTIL AT LEAST SUNRISE.
<
FLOODING WILL BECOME QUITE PRONOUNCED IN THESE AREAS..ESPECIALLY
IN SECONDARY ROADS AND SMALLER CREEKS AND TRIBUTARIES.

THIS IS A VERY DANGEROUS SITUATION. MANY PERSONS WILL BE DRIVING
INTO THE ST LOUIS METROPOLITAN AREA DURING DARKNESS OR SEMI-DAYLIGHT.
DO NOT...DO NOT DRIVE THROUGH FLOWING WATER..YOU COULD BE STRANDED
OR TRAPPED. THE DEPTH OF WATER IS NOT ALWAYS OBVIOUS.

BE VERY CAREFUL TO RECOGNIZE FLOOD DANGERS THIS MORNING.

STAY TUNED TO YOUR NOAA WEATHER RADIO..COMMERCIAL RADIO..OR
TELEVISION STATION FOR LATEST INFORMATION.

PEDIGO
Special weather statement, Sep 18, 5:16 AM CDT, 4 hours 29 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
505 AM CDT THU SEP 18 1986

...FLOODING APPEARS IMMINENT JUST SOUTH OF ST LOUIS...
...FLASH FLOOD WARNINGS CONTINUE FOR FOUR COUNTIES IN EAST CENTRAL
MISSOURI AND SOUTHWEST ILLINOIS...

AT 500 AM...HEAVY THUNDERSTORMS REDEVELOPED OVER FRANKLIN AND JEFFERSON
COUNTIES IN EAST CENTRAL MISSOURI...JUST SOUTH OF THE ST LOUIS METRO-
POLITAN AREA. RAINFALL..HEAVY AT TIMES..HAS BEEN FALLING MOST OF THE
NIGHT THERE. NO OFFICIAL RAINFALL AMOUNTS HAVE BEEN REPORTED AT
THIS TIME..HOWEVER AMOUNTS IN EXCESS OF FIVE INCHES ARE LIKELY.

FLASH FLOOD WARNINGS REMAIN IN EFFECT FOR AT LEAST PORTIONS OF
FRANKLIN AND JEFFERSON COUNTIES IN MISSOURI AND MONROE AND ST. CLAIR
COUNTIES IN ILLINOIS UNTIL ABOUT SUNRISE THIS MORNING.

THUNDERSTORMS HAVE BEGUN TO CROSS EASTWARD THROUGH THE ST LOUIS
METROPOLITAN AREA FURTHER NORTH AND IT APPEARS THAT SHOWERS AND
THUNDERSTORMS WILL CONTINUE THROUGH MUCH OF THE RUSH HOUR THIS
MORNING.

FLOODING WILL BECOME QUITE PRONOUNCED TO THE SOUTH OF ST LOUIS...
ESPECIALLY IN SECONDARY ROADS AND SMALLER CREEKS AND TRIBUTARIES.

THIS IS A VERY DANGEROUS SITUATION. PERSONS DRIVING INTO ST LOUIS
FROM THE SOUTH SHOULD BE PREPARED FOR POSSIBLE FLOODING.
DO NOT...DO NOT DRIVE THROUGH FLOWING WATER..YOU COULD BE STRANDED
OR TRAPPED. THE DEPTH OF WATER IS NOT ALWAYS OBVIOUS.

BE VERY CAREFUL TO RECOGNIZE FLOOD DANGERS THIS MORNDING.

STAY TUNED TO YOUR NOAA WEATHER RADIO..COMMERCIAL RADIO..OR
TELEVISION STATION FOR LATEST INFORMATION.

PEDIGO
Special weather statement, Sep 18, 5:51 AM CDT, 3 hours 54 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
545 AM CDT THU SEP 18 1986

... FLASH FLOOD WATCH CONTINUES FOR ENTIRE ST. LOUIS AREA ...

THE FLASH FLOOD WARNINGS FOR 4 COUNTIES JUST SOUTH OF ST LOUIS WILL
EXPIRE SHORTLY AFTER 6AM.

AT 545 AM...RAIN WAS INDICATED OVER MOST OF THE ST LOUIS AREA WITH
HEAVY RAIN IN NUMEROUS SPOTS. HEAVIER RAIN WAS INDICATED ALONG THE
MISSOURI RIVER NEAR MARTHASVILLE AND WASHINGTON AND EXTENDED INTO
WEST ST LOUIS COUNTY AND JEFFERSON COUNTY.

THE HEAVIER DOWNPOURS WILL TEND TO FLOOD LOW SPOTS IN ROADS..AND
RUSH HOUR MOTORISTS SHOULD KEEP ALERT FOR THESE FLOODED AREAS.
IN ADDITION..SMALLER CREEKS AND STREAMS WILL BeE RISING AND COULD
OVERFLOW THEIR BANKS.
.
SHOWERS AND OCCASIONAL HEAVY DOWNPOURS WIL CONTINUE IN THE ST.
LOUIS AREA THROUGH THE MORNING RUSH HOUR.

FELDT
Special weather statement, Sep 18, 8:46 AM CDT, 59 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE ST LOUIS MO.
836 AM CDT THU SEP 18 1986

..A FLASH FLOOD WATCH IS IN EFFECT THIS MORNING FROM WEST CENTRAL TO
  EAST CENTRAL MISSOURI..KANSAS CITY TO ST LOUIS..
..STRONG STORMS PRODUCING VERY HEAVY RAINS CONTINUE FROM CENTRAL TO
  EAST CENTRAL MISSOURI TO SOUTHWEST ILLINOIS..

AT 832 AM CDT...SCATTERED THUNDERSTORMS WITH VERY HEAVY RAINS CONTINUED
IN PARTS OF CENTRAL TO EAST CENTRAL MISSOURI TO SOUTHWEST ILLINOIS.
SCATTERED THUNDERSHOWERS CONTINUED IN A LARGE PART OF WEST CENTRAL
TO EAST CENTRAL MISSOURI TO SOUTHEAST ILLINOIS.

THIS 175 MILE WIDE AREA OF STORMS EXTENDED FROM WEST OF SEDALIA
THROUGH THE ST LOUIS MISSOURI AREA TO EAST OF PADUCAH KENTUCKY.

THE STRONGER STORMS WITH VERY HEAVY RAINS WERE IN A 40 MILE WIDE AREA
FROM NEAR THE VICHY/RALLO AREA IN MISSOURI TO JUST WEST OF MARION
ILLINOIS. THESE STORMS WERE MOVING TO THE SOUTHEAST AT 25 MILES A	N HOUR.

TRAVELERS SHOULD TAKE EXTRA CAUTION THIS MORNING AROUND LOW LYING AREAS
AND LOW BRIDGES..AND ANY PLACE WATER MAY COLLECT.

BB
Special weather statement, Sep 18, 9:41 AM CDT, 4 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE ST LOUIS MO.
930 AM CDT THU SEP 18 1986

..A FLASH FLOOD WATCH IS IN EFFECT THIS MORNING FROM WEST CENTRAL TO
  EAST CENTRAL MISSOURI..KANSAS CITY TO ST LOUIS..
..STRONG STORMS PRODUCING VERY HEAVY RAINS CONTINUE IN EAST CENTRAL
  ..AND SOUTHEAST MISSOURI..

AT 928 AM CDT...AN ISOLATED THUNDERSTORM WITH VERY HEAVY RAIN WAS
OCCURRING JUST NORTH OF ST LOUIS IN EAST CENTRAL MISSOURI. SCATTERED
THUNDERSTORMS WITH VERY HEAVY RAINS CONTINUED IN PARTS OF CENTRAL TO
SOUTHEAST MISSOURI. SCATTERED THUNDERSTORMS..SOME WITH HEAVY RAINS..
CONTINUED IN A LARGE PART OF CENTRAL TO EAST CENTRAL MISSOURI TO
SOUTHEAST ILLINOIS.

THIS 160 MILE WIDE AREA OF STORMS EXTENDED FROM 50 MILES WEST OF
JEFFERSON CITY THROUGH EAST CENTRAL MISSOURI TO NORTHEAST OF PADUCAH
KENTUCKY.

THE STRONGER STORMS WERE 10 MILES NORTH OF ST LOUIS MISSOURI..AND IN
A 30 MILE WIDE AREA FROM THE VTICHY/RALLO AREA TO 20 MILES NORTHWEST
OF CAPE GIRARDEAU MISSOURI.

TRAVELERS SHOULD TAKE EXTRA THE TODAY AND WATCH FOR WATER COLLECTING
IN LOW AREAS.

BB

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 18, 3:23 AM CDTFlash Flood WarningLSXMonroe, Saint Clair3 hr
Sep 18, 7:04 AM CDTFlash Flood WarningLSXMonroe3 hr

Nearby

Flash Flood Warnings in Illinois, 1986Every flash flood warning in 1986

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.