Alert archive / Illinois / Severe Thunderstorm Warnings in 1987

Severe Thunderstorm Warning 39, NWS St. Louis, MO

July 6, 1987Greene County, Illinois

NWS St. Louis, MO issued this severe thunderstorm warning at Jul 6, 1987, 3:24 PM CDT for Greene County, Illinois. It was in force for 39 min.

The area

The counties it named.

The facts

Issued: Jul 6, 1987, 3:24 PM CDT (20:24 UTC)
Expired: Jul 6, 1987, 4:03 PM CDT
In force: 39 min
Issued by: NWS St. Louis, MO
Area: Whole counties

County Greene 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, 8.4 hours before the alert went out and 151 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 2811 J/kg
Mixed-layer CIN: -34 J/kg
Mixed-layer LCL: 724 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 151 m²/s²
0-3 km storm-relative helicity: 143 m²/s²
Significant tornado parameter: 1.7
Supercell composite: 8.8

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KSTL 062027
SVRSTL
ILC061-062115-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
324 PM CDT MON JUL 6 1987

THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING
EFFECTIVE UNTIL 415 PM CDT FOR PEOPLE IN THE FOLLOWING COUNTIES OF

SOUTHWEST ILLINOIS...  GREENE

AT 323 A SEVERE THUNDERSTORMWAS JUST NORTHWEST OF CARROLLTON ILLINOIS
ABOUT 50 MILES NORTH NORTHWEST OF ST. LOUIS.  IT WAS MOVING EAST AT
25 MPH.

THIS STORM WILL LIKELY PRODUCE LARGE HAIL...EXTREMELY HEAVY RAIN
AND STRONG WINDS AS IT MOVES BETWEEN CARROLLTON AND WHITE HALL
TOWARD GREENFIELD ILLINOIS.

REPORT ANY SEVERE WEATHER TO YOUR NEAREST LAW ENFORCEMENT AGENCY
ORx THE NATIONAL WEATHER SERVICE.

MCCARTHY

What forecasters said that day

The local office's own words before this severe thunderstorm 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, Jul 6, 10:12 AM CDT, 5 hours 12 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
1010 AM CDT MON JUL 6 1987

...ONE VERY STRONG THUNDERSTORM WEST OF ST. LOUIS...

AT 1010 AM ONE LARGE...VERY STRONG THUNDERSTORM WAS 40 MILES WEST OF
ST LOUIS...BETWEEN WASHINGTON AND WENTZVILLE MISSOURI...MOVING EAST
AT 25 MPH.  THIS STORM WILL PRODUCE EXTREMELY HEAVY RAIN...STRONG
WINDS...FREQUENT LIGHTNING AND POSSIBLY HAIL AS IT MOVES THROUGH
ST. CHARLES COUNTY...THE NORTHEASKT TIP OF FRANKLIN COUNTY AND
INTO WEST ST. LOUIS COUNTY BY 11 AM.

MCCARTHY

Special weather statement, Jul 6, 10:30 AM CDT, 4 hours 54 minutes before

SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE ST LOUIS MO
1030 AM CDT MON JUL 6 1987

...ONE VERY STRONG THUNDERSTORM WEST OF ST. LOUIS...

AT 1025 AM...ONE VERY STRONG THUNDERSTORM WAS 35 MILES WEST OF
ST LOUIS...JUST SOUTH OF WENTZVILLE MISSOURI...MOVING EAST AT 25
MILES AN HOUR. THIS STORM WILL PRODUCE EXTREMELY HEAVY RAIN...STRONG
WINDS...FREQUENT LIGHTNING AND POSSIBLY HAIL AS IT MOVES THROUGH
ST. CHARLES COUNT_Y...THE NORTHEAST TIP OF FRANKLIN COUNTY AND
INTO WEST ST. LOUIS COUNTY BY 11 AM.
HUTSELL

Special weather statement, Jul 6, 12:37 PM CDT, 2 hours 47 minutes before

SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE ST LOUIS MO
1235 PM CDT MON JUL 6 1987

...SEVERE THUNDERSTORM WATCH FOR PARTS OF SOUTHERN ILLINOIS TIL 5 PM...

AT 1230 PM VERY STRONG THUNDERSTORMS WERE SCATTERED 25 TO 75 MILES
NORTH AND EAST OF ST. LOUIS.  A SEVERE THUNDERSTORM WAS 35 MILES
EAST SOUTHEAST OF ST. LOUIS...BETWEEN BREESE AND OKAWVILLE ILLINOIS.
THIS STORM PRODUCED LARGE HAIL JUST EAST OF BELLEVILLE ILLINOIS
AROUND NOON.

OTHER VERY STRONG STORMS WERE BETWEEN WATERLOO AND NEW ATHENS ILLINOIS
ABOUT 25 MILES SOUTHEAST OF ST. LOUIS...AND NEAR THE MISSISSIPPI
RIVER SOUTH OF ELSBERRY MISSOURI...ABOUT 40 MILES NORTHWEST OF
ST. LOUIS.

THE STORMS WERE MOVING EAST AT 25 MPH.

MCCARTHY

Special weather statement, Jul 6, 2:05 PM CDT, 1 hour 19 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE COLUMBIA MO
200 PM CDT MON JUL 6 1987

...STRONG THUNDERSTORMS OVER AUDRAIN AND CALLAWAY COUNTIES...

AT 155 PM CDT STRONG THUNDERSTORMS WERE IN AN AREA 15 MILES WIDE FROM 
MEXICO IN AUDRAIN COUNTY OR 25 MILES NORTHEAST OF COLUMBIA TO EAST OF
KINGDOM CITY OR 25 MILES EAST OF COLUMBIA. THESE STORMS COULD PRODUCE
VERY HEAVY RAIN AND POSSIBLE HAIL AND DANGEROUS LIGHTNING. THE STORMS WERE
MOV.ING EAST AT 25 MILES AN HOUR. WATCH FOR THREATENING WEATHER AND BE 
PREPARED TO MOVE TO SAFETY IF YOU ARE IN THE AREA THREATENED BY THESE
STORMS.

MET

Special weather statement, Jul 6, 2:54 PM CDT, 30 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
250 PM CDT MON JUL 6 1987

...STORMS MOVING THROUGH PIKE COUNTY MISSOURI INTO PIKE COUNTY ILLINOIS.

AT 245 PM THUNDERSTORMS PELLTED BOYWLING GREEN MISSOURI WITH SMALL HAIL.
BOWLING GREEN IS ABOUT 60 MILES NORTHWEST OF ST LOUIS.  THESE STORMS
WERE MOVING EAST AT 25 MPH AND WILL PASS THROUGH LOUISIANA MISSOURI
AND PITTSFIELD ILLINOIS BETWEEN 250 PM AND 4 PM.

HAMILTON

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 5, 8:09 PM CDT	Severe Thunderstorm Warning	LSX	Calhoun, Jersey	36 min
Jul 6, 11:20 AM CDT	Severe Thunderstorm Warning	LSX	Saint Clair	55 min
Jul 6, 12:00 PM CDT	Severe Thunderstorm Warning	LSX	Clinton, Saint Clair, Washington	60 min
Jul 6, 1:05 PM CDT	Severe Thunderstorm Warning	LSX	Jefferson, Marion, Washington	40 min
Jul 6, 3:10 PM CDT	Severe Thunderstorm Warning	LSX	Calhoun, Pike	50 min
Jul 6, 4:24 PM CDT	Severe Thunderstorm Warning	LSX	Calhoun, Jersey, Madison	51 min
Jul 6, 4:55 PM CDT	Severe Thunderstorm Warning	LSX	Saint Clair	35 min
Jul 6, 5:26 PM CDT	Severe Thunderstorm Warning	LSX	Fayette	64 min
Jul 6, 5:52 PM CDT	Severe Thunderstorm Warning	LSX	Effingham	53 min

Nearby

Severe Thunderstorm Warnings in Illinois, 1987 Every severe thunderstorm warning in 1987

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.