Alert archive / Illinois / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 320, NWS St. Louis, MO

September 29, 1998Adams County, Illinois; Marion County, Missouri

NWS St. Louis, MO issued this severe thunderstorm warning at Sep 29, 1998, 5:13 AM CDT for Adams County, Illinois; Marion County, Missouri. It was in force for 47 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Sep 29, 1998, 5:13 AM CDT (10:13 UTC)
Expired
Sep 29, 1998, 6:00 AM CDT
In force
47 min
Issued by
NWS St. Louis, MO
Area
Whole counties

Counties Adams County, IL, Marion County, MO

The radar

The St Louis radar (KLSX), 147 km from the middle of the area, began a volume at 10:14 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.

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 10.2 hours before the alert went out and 206 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, Davenport, at 00:00Z on 1998-09-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Davenport, at 00:00Z on 1998-09-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 73 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
2208 m above ground
0-6 km bulk shear
45 kt
0-1 km storm-relative helicity
73 m²/s²
0-3 km storm-relative helicity
128 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.

089 
WUUS1 KSTL 291014 RRA
SVRSTL
ILC001-MOC127-291100-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
513 AM CDT TUE SEP 29 1998

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  ADAMS COUNTY IN WEST CENTRAL ILLINOIS
  EASTERN MARION COUNTY MISSOURI IN NORTHEASTERN MISSOURI

* UNTIL 600 AM CDT

* AT 512 AM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 5 MILES SOUTHEAST OF PALMYRA... MOVING EAST AT
  25 MPH.

* LOCATIONS THAT WILL BE AFFECTED...
  PAYSON AT 530 AM
  KINGSTON AT 545 AM


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/WDB

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, Sep 29, 12:05 AM CDT, 5 hours 8 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SPRINGFIELD MO
1205 AM CDT TUE SEP 29 1998

...SEVERE THUNDERSTORM WATCH FOR PORTIONS OF THE OZARKS
   UNTIL 500 AM...

A SEVERE THUNDERSTORM WATCH...VALID UNTIL 500 AM...HAS BEEN ISSUED
 BY THE NATIONAL WEATHER SERVICE FOR THE FOLLOWING COUNTIES IN
SOUTHWEST AND CENTRAL MISSOURI...

BENTON            CAMDEN            HICKORY
MILLER            MORGAN            VERNON

AND FOR THE FOLLOWING COUNTY IN SOUTHEAST KANSAS...

BOURBON

A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE FAVORABLE FOR THE
DEVELOPMENT OF SEVERE WEATHER IN AND CLOSE TO THE WATCH AREA. IF
YOU ARE IN THE WATCH AREA...KEEP UP TO DATE OF THE LATEST WEATHER
INFORMATION. HAIL LARGER THAN DIME SIZE AND WIND GUSTS OVER 58
MILES PER HOUR WILL BE LIKELY WITH STORMS IN THE WATCH AREA.
TORRENTIAL RAINFALL WILL ALSO BE LIKELY.

IF A SEVERE THUNDERSTORM WARNING IS ISSUED FOR YOUR AREA...A SEVERE
THUNDERSTORM HAS BEEN OBSERVED OR INDICATED BY RADAR. IF YOU ARE
NEAR OR IN THE PATH OF THIS STORM...TAKE THE FOLLOWING ACTIONS TO
PROTECT LIFE AND PROPERTY...

1) IN OPEN COUNTRY...SEEK SHELTER AND AVOID TREES WHICH CAN
BE TARGETS FOR LIGHTNING. IF THERE IS NO SHELTER...GO TO A DITCH OR
CULVERT BUT BEWARE OF RISING WATER WHICH CAN CAUSE FLOODING.

2) WHEN INDOORS...STAY AWAY FROM WINDOWS AND GO TO AN INTERIOR ROOM.
AVOID USING ELECTRICAL APPLIANCES.

3) IN MOBILE HOMES...YOU SHOULD LEAVE AND SEEK NEARBY SAFE SHELTER.

REMEMBER...WITH ANY SEVERE THUNDERSTORM THERE IS ALWAYS THE
POSSIBILITY OF TORNADOES.

TERRY

Nearby

Severe Thunderstorm Warnings in Illinois, 1998Severe Thunderstorm Warnings in Missouri, 1998Every 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.