Alert archive / Illinois / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 45, NWS St. Louis, MO

February 27, 1999Marion County, Illinois

NWS St. Louis, MO issued this severe thunderstorm warning at Feb 27, 1999, 1:37 PM CST for Marion County, Illinois. It was in force for 48 min. 5 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: Feb 27, 1999, 1:37 PM CST (19:37 UTC)
Expired: Feb 27, 1999, 2:25 PM CST
In force: 48 min
Issued by: NWS St. Louis, MO
Area: Whole counties

County Marion County, IL

What was reported inside it

Time	Report	Where
Feb 27, 2:00 PM CST	Hail 1	Sandoval, IL
Feb 27, 2:00 PM CST	Thunderstorm Wind 55	Junction City, IL
Feb 27, 2:10 PM CST	Hail 1.75	Salem, IL
Feb 27, 2:10 PM CST	Thunderstorm Wind 53	Salem, IL
Feb 27, 2:20 PM CST	Hail 1.25	Kinmundy, 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, 7.6 hours before the alert went out and 169 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: 107 J/kg
Mixed-layer CIN: -160 J/kg
Mixed-layer LCL: 635 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 275 m²/s²
0-3 km storm-relative helicity: 325 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.

999 
WUUS1 KSTL 271939 RRA
SVRSTL
ILC121-272025-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
137 PM CST SAT FEB 27 1999

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  MARION COUNTY ILLINOIS IN SOUTHWESTERN ILLINOIS

* UNTIL 225 PM CST

* AT 135 PM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM FROM VERNON TO CARLYLE... MOVING EAST AT 30
  MPH.

* LOCATIONS THAT WILL BE AFFECTED...
  SANDOVAL
  SALEM
  KINMUNDY



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 FLOOR OR YOUR HOME OR BUSINESS.
HEAVY RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE INTO AREAS WHERE
WATER COVERS THE ROAD.



GKS/RP

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, Feb 27, 7:56 AM CST, 5 hours 41 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>075-084-085-099-261700-

SEVERE WEATHER OUTLOOK
NATIONAL WEATHER SERVICE ST LOUIS MO
750 AM CST FRIDAY FEB 26 1999

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 OVER THE SOUTHEASTERN
PORTION OF THE COUNTY WARNING AREA THIS AFTERNOON AND EVENING. THE
AREA AFFECTED IS GENERALLY SOUTH AND EAST OF A CHESTERFIELD MISSOURI
TO VICHY MISSOURI LINE. THE THUNDERSTORMS WILL HAVE THE
POTENTIAL TO PRODUCE LARGE HAIL.

SKYWARN PERSONNEL AND EMERGENCY MANAGEMENT OFFICIALS SHOULD STAY
ABREAST OF LATEST FORECASTS AND OUTLOOKS SHOULD SKYWARN ACTIVATION
BECOME NECESSARY LATER TODAY.

WDB

The office that day

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

Issued	Product	Office	Counties	Lasted
Feb 27, 11:34 AM CST	Severe Thunderstorm Warning	LSX	Madison, Saint Clair	66 min
Feb 27, 11:51 AM CST	Tornado Warning	LSX	Madison, Saint Clair	49 min
Feb 27, 12:11 PM CST	Severe Thunderstorm Warning	LSX	Monroe	34 min
Feb 27, 12:13 PM CST	Tornado Warning	LSX	Monroe	47 min
Feb 27, 12:26 PM CST	Tornado Warning	LSX	Bond, Clinton	44 min
Feb 27, 12:45 PM CST	Severe Thunderstorm Warning	LSX	Fayette	50 min
Feb 27, 12:49 PM CST	Severe Thunderstorm Warning	LSX	Saint Clair	46 min
Feb 27, 1:05 PM CST	Severe Thunderstorm Warning	LSX	Monroe	50 min
Feb 27, 1:07 PM CST	Severe Thunderstorm Warning	LSX	Clinton	48 min
Feb 27, 1:26 PM CST	Severe Thunderstorm Warning	LSX	Randolph	49 min

Nearby

Severe Thunderstorm Warnings in Illinois, 1999 Every severe thunderstorm warning in 1999

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.