Alert archive / Illinois / Severe Thunderstorm Warnings in 1987

Severe Thunderstorm Warning 37, NWS Lincoln, IL

July 5, 1987Macoupin County, Montgomery County, Morgan County, Illinois

NWS Lincoln, IL issued this severe thunderstorm warning at Jul 5, 1987, 2:22 PM CDT for Macoupin County, Montgomery County, Morgan County, Illinois. It was in force for 38 min.

The area

The counties it named.

The facts

Issued
Jul 5, 1987, 2:22 PM CDT (19:22 UTC)
Expired
Jul 5, 1987, 3:00 PM CDT
In force
38 min
Issued by
NWS Lincoln, IL
Area
Whole counties

Counties Macoupin County, IL, Montgomery County, IL, Morgan 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, 7.4 hours before the alert went out and 118 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 1987-07-05Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 151 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 1987-07-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 82 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
151 J/kg
Mixed-layer CIN
-31 J/kg
Mixed-layer LCL
575 m above ground
0-6 km bulk shear
37 kt
0-1 km storm-relative helicity
82 m²/s²
0-3 km storm-relative helicity
121 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 KSPI 051922
SVRSPI
ILC137-117-135-052000-

BULLETIN - IMMEDIATE BROADCAST REQUESTED/EBS ACTIVATION REQUESTED 
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SPRINGFIELD IL
222 PM CDT SUN JUL 5 1987

THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM 
WARNING EFFECTIVE UNTIL 300 PM CDT FOR PEOPLE IN THE FOLLOWING 
COUNTIES OF

CENTRAL ILLINOIS...MORGAN...MACOUPIN AND MONTGOMERY

AT 215PM CDT A FUNNEL CLOUDY WAS REPORTED IN THE NORTHERN PART OF
CARLINVILLE IN MACOUPIN COUNTY...40 MILES SOUTH SOUTHWEST OF
SPRINGFIELD...MOVING TOWARD THE NORTHEAST. THE LEADING EDGE OF A
LARGE AREA OF THUNDERSTORMS WAS PARALLEL TO THE MISSISSIPPI RIVER
FROM 20 MILES NORTH OF QUINCY TO 60 MILES SOUTH OF ST. LOUIS. ALONG
AMD NEAR THE LEADING EDGE...FUNNEL CLOUDS...DANGEROUS LIGHTNING...
AND TORRENTIAL RAINS ARE POSSIBLE.

IF YOU ARE IN AN AREA THREATENED BY THE STORM..GO TO A REINFORCED
SHELTER AND PREPARE FOR DAMAGING WIND...LARGE HAIL...VERY HEAVY
RAIN AND DANGEROUS LIGHTNING.

REMEMBER...SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE
A TORNADO WITH LITTLE OR NO ADVANCE WARNING SO BE ON THE LOOKOUT.

INTENSE LIGHTNING IS REPORTED WITH THIS STORM.  IF OUTDOORS...
STAY AWAY FROM HIGH OBJECTS.  MOVE INDOOR IF POSSIBLE.  WHEN
INDOORS...STAY AWAY FROM WINDOWS AND DOORS AND AVOID USING
TELEPHONES AND ELECTRICAL EQUIPMENT.

 ATTN ISP DIST...9 AND 18
 FS

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 5, 2:17 PM CDT, 5 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SPRINGFIELD IL
215 PM CDT SUN JUL 5 1987

...STRONG THUNDERSTORMS MOVING INTO CENTRAL ILLINOIS...

AT 210 PM CDT RADAR INDICATED THE LEADING EDGE OF A LARGE AREA OF
SHOWERS AND THUNDERSTORMS EXTENDED FROM COLCHESTER TO BEARDSTOWN TO
JACKSONVILLE TO GREENVILLE THEN SOUTH TO DU QUOIN.

THE STRONGEST THUNDERSTORMS WERE IN A LINE EXTENDING FROM MEREDOSIA
TO CARLINVILLE TO GREENVILLE.  THESE STORMS WERE MOVING TOWARD THE
EAST A 30 MILES AN HOUR.

STRONG GUSTY WINDS...HEAVY RAIN AND DANGEROUS LIGHTNING ARE ASSOCIATED
WITH THESE  STORMS.  IF THREATING WEATHER APPROACHES YOUR AREA...BE
CAUTIOUS AND SEEK SHELTER.

REEDY

Nearby

Severe Thunderstorm Warnings in Illinois, 1987Every 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.