Alert archive / Illinois / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 71, NWS St. Louis, MO

May 5, 1999Marion County, Illinois

NWS St. Louis, MO issued this severe thunderstorm warning at May 5, 1999, 2:03 PM CDT for Marion County, Illinois. It was in force for 47 min. 1 report 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
May 5, 1999, 2:03 PM CDT (19:03 UTC)
Expired
May 5, 1999, 2:50 PM CDT
In force
47 min
Issued by
NWS St. Louis, MO
Area
Whole counties

County Marion County, IL

What was reported inside it

TimeReportWhereRemark
May 5, 2:15 PM CDTHail 1.5Iuka, 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, 7.1 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-pSkew-T log-p diagram, Lincoln, IL at 12:00Z on 1999-05-05Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 49 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, Lincoln, IL at 12:00Z on 1999-05-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 208 square meters per square second.1939587897Sfc1 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
49 J/kg
Mixed-layer CIN
-201 J/kg
Mixed-layer LCL
869 m above ground
0-6 km bulk shear
44 kt
0-1 km storm-relative helicity
208 m²/s²
0-3 km storm-relative helicity
200 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 051904 RRA
SVRSTL
ILC121-051950-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
203 PM CDT WED MAY 5 1999

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

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

* UNTIL 250 PM CDT

* AT 200 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR
  INDICATED A SEVERE THUNDERSTORM WAS 15 MILES SOUTH-SOUTHEAST OF
  SALEM ILLINOIS... MOVING NORTHEAST AT 35 MPH.

* LOCATIONS THAT WILL BE AFFECTED...
  HELM AT 215 PM CDT

THE PRIMARY SEVERE WEATHER THREAT IS DAMAGING HAIL. LARGE HAIL CAN
CAUSE EXTENSIVE PROPERTY DAMAGE AN SERIOUS INJURY TO PEOPLE CAUGHT
OUTDOORS. MOVE INSIDE A STURDY BUILDING IMMEDIATELY.


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, May 5, 11:05 AM CDT, 2 hours 58 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>075-084-085-099-061200-

SEVERE WEATHER OUTLOOK
NATIONAL WEATHER SERVICE ST LOUIS MO
1105 AM CDT WED MAY 5 1999

THIS OUTLOOK COVERS THE COUNTY WARNING AREA OF THE NWS OFFICE
IN ST LOUIS.  AREAS INCLUDED ARE PARTS OF CENTRAL...NORTHEAST...AND
EAST CENTRAL MISSOURI...AND SOUTHWEST ILLINOIS.

THERE IS A SLIGHT RISK FOR SEVERE THUNDERSTORMS THIS AFTERNOON AND THIS
EVENING ACROSS SOUTHWEST ILLINOIS AND EASTERN MISSOURI...ALONG AND EAST
OF A LINE FROM QUINCY TO BOWLING GREEN TO WARRENTON TO STEELVILLE.
SKYWARN ACTIVATION MAY BE NEEDED THIS AFTERNOON AND THIS EVENING.

A STRONG LOW PRESSURE CENTER OVER NORTHWESTERN IOWA LATE THIS MORNING
WILL MOVE SLOWLY NORTH INTO SOUTHWEST MINNESOTA BY THIS EVENING.
EXTENDING SOUTHWARD FROM THIS LOW PRESSURE IS A COLD FRONT THROUGH
WESTERN MISSOURI.  THIS COLD FRONT...WHICH WILL ACT AS A FOCUS FOR
THUNDERSTORM DEVELOPMENT THIS AFTERNOON AND THIS EVENING...WILL SLOWLY
MOVE EASTWARD THROUGH EASTERN MISSOURI EARLY THIS EVENING AND THROUGH
SOUTHWEST ILLINOIS DURING LATE EVENING.

THUNDERSTORMS THROUGH EARLY EVENING WILL MOVE TO THE NORTHEAST AT 50
MPH...WITH EXPECTED MOVMENT DURING MUCH OF THE EVENING HOURS TO BE TO
THE NORTHEAST AT 30 TO 35 MPH.  THUNDERSTORMS WILL BE CAPABLE OF
PRODUCING HAIL TO ONE INCH IN DIAMETER AND WIND GUSTS TO 55 MPH.

AGAIN...THERE IS A SLIGHT RISK FOR SEVERE THUNDERSTORMS FOR MUCH OF
EASTERN MISSOURI AND ALL OF SOUTHWEST ILLINOIS.  STAY TUNED TO NOAA
WEATHER RADIO OR YOUR LOCAL RADIO OR TELEVISION STATION FOR UPDATES AND
POSSIBLE WARNINGS.

TES

The office that day

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

IssuedProductOfficeCountiesLasted
May 5, 5:24 PM CDTSevere Thunderstorm WarningLSXWashington36 min
May 5, 5:36 PM CDTSevere Thunderstorm WarningLSXMarion49 min
May 5, 6:11 PM CDTTornado WarningLSXMarion49 min
May 5, 6:16 PM CDTSevere Thunderstorm WarningLSXFayette34 min
May 5, 6:23 PM CDTSevere Thunderstorm WarningLSXMadison, Saint Clair47 min

Nearby

Severe Thunderstorm Warnings in Illinois, 1999Every 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.