Alert archive / Illinois / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 323, NWS St. Louis, MO

October 29, 1998Brown County, Illinois

NWS St. Louis, MO issued this severe thunderstorm warning at Oct 29, 1998, 12:58 PM CST for Brown County, Illinois. It was in force for 32 min. 2 reports came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued: Oct 29, 1998, 12:58 PM CST (18:58 UTC)
Expired: Oct 29, 1998, 1:30 PM CST
In force: 32 min
Issued by: NWS St. Louis, MO
Area: Whole counties

County Brown County, IL

The radar

The Lincoln radar (KILX), 122 km from the middle of the area, began a volume at 18:59 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.

What was reported inside it

Time	Report	Where	Remark
Oct 29, 1:02 PM CST	Hail 1.75	Versailles, IL
Oct 29, 1:15 PM CST	Hail 0.75	Versailles, IL

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 7.0 hours before the alert went out and 184 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: 934 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 155 m²/s²
0-3 km storm-relative helicity: 203 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KSTL 291859
SVRSTL
ILC009-291930-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
1258 PM CST THU OCT 29 1998

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  BROWN COUNTY IN WEST CENTRAL ILLINOIS

* UNTIL 130 PM CST

* AT 1255 PM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 5 MILES SOUTHWEST OF VERSAILLES... MOVING
  NORTHEAST AT 30 MPH.

* LOCATIONS THAT WILL BE AFFECTED...
  VERSAILLES
  LA GRANGE

SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND GUSTS IN EXCESS OF 60
MPH...DAMAGING HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN. MOVE
TO AN INTERIOR ROOM ON THE LOWEST FLOO(R OR YOUR HOME OR BUSINESS.
HEAVY RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE INTO AREAS WHERE
WATER COVERS THE ROAD.

CA/FG

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, Oct 29, 11:08 AM CST, 1 hour 50 minutes before

ILZ058>060-064-065-069-070-074-079-095>102-MOZ009-010-018-019-026-
027-034>036-041-042-047>052-059>065-072>075-084-085-099-292300-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
1108 AM CST THU OCT 29 1998

...SEVERE WEATHER POSSIBLE THIS AFTERNOON AND THIS EVENING...

THIS OUTLOOK COVERS THE COUNTY WARNING AREA OF THE NATIONAL WEATHER
SERVICE FORECAST OFFICE IN ST LOUIS.  AREAS INCLUDED ARE PORTIONS OF
NORTHEAST...CENTRAL...EAST CENTRAL AND SOUTHEAST MISSOURI AS WELL AS
WEST CENTRAL AND SOUTHWEST ILLINOIS.

THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS THIS AFTERNOON AND
THIS EVENING OVER THE ENTIRE AREA...THIS INCLUDES MOST OF CENTRAL
AND EASTERN MISSOURI AND A GOOD PORTION OF WESTERN ILLINOIS.

A COLD FRONT ACROSS EASTERN KANSAS WILL PUSH INTO WESTERN MISSOURI
THIS AFTERNOON AND INTO EASTERN MISSOURI THIS EVENING.  AS THIS
FRONT ENCOUNTERS UNSEASONABLY WARM...MOIST AND UNSTABLE AIR ACROSS
THE AREA...SCATTERED THUNDERSTORMS ARE EXPECTED TO DEVELOP.

INCREASING WINDS ALOFT WILL CREATE FAVORABLE WIND SHEAR PROFILES
FOR STRONG TO SEVERE THUNDERSTORMS...INCLUDING A FEW SUPERCELLS.

STORM SPOTTER GROUPS AND EMERGENCY MANAGERS SHOULD MONITOR WEATHER
DEVELOPMENxTS...AND BE READY FOR POSSIBLE SKYWARN ACTION.

GLASS

The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 29, 5:11 PM CST	Severe Thunderstorm Warning	LSX	Calhoun	34 min
Oct 29, 5:50 PM CST	Severe Thunderstorm Warning	LSX	Greene	40 min

Nearby

Severe Thunderstorm Warnings in Illinois, 1998 Every severe thunderstorm warning in 1998

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.