Alert archive / Illinois / Severe Thunderstorm Warnings in 1990

Severe Thunderstorm Warning 65, NWS Lincoln, IL

June 30, 1990Macoupin County, Montgomery County, Sangamon County, Illinois

NWS Lincoln, IL issued this severe thunderstorm warning at Jun 30, 1990, 8:55 AM CDT for Macoupin County, Montgomery County, Sangamon County, Illinois. It was in force for 35 min.

The area

The counties it named.

The facts

Issued: Jun 30, 1990, 8:55 AM CDT (13:55 UTC)
Expired: Jun 30, 1990, 9:30 AM CDT
In force: 35 min
Issued by: NWS Lincoln, IL
Area: Whole counties

Counties Macoupin County, IL, Montgomery County, IL, Sangamon 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

Paducah/Barkley, KY (KPAH), launched 12:00Z, 1.9 hours before the alert went out and 275 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: NaN m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 72 m²/s²
0-3 km storm-relative helicity: 102 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KSPI 301355
SVRSPI
ILC117-167-135-301430-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING 
NATIONAL WEATHER SERVICE SPRINGFIELD IL
855 AM CDT SAT JUN 30 1990

THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM 
WARNING EFFECTIVE UNTIL 930 AM CDT FOR PEOPLE IN THE FOLLOWING 
COUNTIES

   IN THE CENTRAL PART OF ILLINOIS
      NORTHERN MACOUPIN...SANGAMON...NORTHERN MONTGOMERY

A SEVERE THUNDERSTORM PRODUCING TORRENTIAL RAIN...HAIL...DAMAGING
WIND AND DANGEROUS LIGHTNING WAS 20 MILES IN DIAMETER AND CENTERED
30 MILES WEST SOUTHWEST OF SPRINGFIELD. IT WAS MOVING RAPIDLY
TOWARD THE EAST AND SOUTHEAST AT 40 MILES AN HOUR. A FEW OF THE
CITIES THAT WILL BE EFFECTED BY THIS STORM WERE THE CITY OF
SPRINGFIELD...AUBURN...DIVERNON...VIRDON...GIRARD AND WHITE OAK.

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 INDOORS IF POSSIBLE. WHEN
INDOORS...STAY AWAY FROM WINDOWS AND DOORS. AVOID USING TELEPHONES
AND ELECTRICAL EQUIPIMENT.

THIS IS A DANGEROUS STORM. TAKE COVER IMMEDIATELY.

 ATTN ISP DIST...9 AND 18
 FS

The office that day

Everything else NWS Lincoln, IL issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 30, 10:34 AM CDT	Severe Thunderstorm Warning	ILX	Clark	56 min
Jun 30, 11:34 AM CDT	Severe Thunderstorm Warning	ILX	Menard, Sangamon	56 min
Jun 30, 1:46 PM CDT	Flash Flood Warning	ILX	Fulton, Mason, Peoria, Tazewell	119 min
Jun 30, 3:30 PM CDT	Flash Flood Warning	ILX	Stephenson	3 hr
Jun 30, 3:30 PM CDT	Flash Flood Warning	ILX	Boone, DeKalb	3 hr
Jun 30, 3:52 PM CDT	Flash Flood Warning	ILX	Carroll, Ogle	3 hr
Jun 30, 4:19 PM CDT	Flash Flood Warning	ILX	Peoria	116 min

Nearby

Severe Thunderstorm Warnings in Illinois, 1990 Every severe thunderstorm warning in 1990

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.