Alert archive / Illinois / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 55, NWS St. Louis, MO

April 8, 1999Bond County, Montgomery County, Illinois

NWS St. Louis, MO issued this severe thunderstorm warning at Apr 8, 1999, 10:17 PM CDT for Bond County, Montgomery County, Illinois. It was in force for 43 min. 4 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
Apr 8, 1999, 10:17 PM CDT (03:17 UTC)
Expired
Apr 8, 1999, 11:00 PM CDT
In force
43 min
Issued by
NWS St. Louis, MO
Area
Whole counties

Counties Bond County, IL, Montgomery County, IL

The radar

The St Louis radar (KLSX), 113 km from the middle of the area, began a volume at 03:20 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

TimeReportWhereRemark
Apr 8, 10:20 PM CDTThunderstorm Wind 60Sorento, IL
Apr 8, 10:22 PM CDTThunderstorm Wind 60Walshville, IL
Apr 8, 10:25 PM CDTThunderstorm Wind 60Panama, IL
Apr 8, 10:29 PM CDTThunderstorm Wind 50Greenville, 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Apr 8, 8:00 PM CDTTornado WatchSPC5 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 00:00Z, 3.3 hours before the alert went out and 142 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 00:00Z on 1999-04-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 859 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 00:00Z on 1999-04-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 344 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
859 J/kg
Mixed-layer CIN
-35 J/kg
Mixed-layer LCL
1075 m above ground
0-6 km bulk shear
73 kt
0-1 km storm-relative helicity
344 m²/s²
0-3 km storm-relative helicity
449 m²/s²
Significant tornado parameter
1.9
Supercell composite
8.7

Open this sounding in Storm Lab

The text

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

999 
WUUS1 KSTL 090319 RRA
SVRSTL
ILC005-135-090400-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
1017 PM CDT THU APR 8 1999

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHERN BOND COUNTY IN SOUTHWESTERN ILLINOIS
  SOUTHERN MONTGOMERY COUNTY ILLINOIS IN SOUTHWESTERN ILLINOIS

* UNTIL 1100 PM CDT

* AT 1012 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  A LINE OF SEVERE THUNDERSTORMS SOUTHERN MONTGOMERY COUNTY NEAR
  COFFIN TO JUST WEST OF GREENVILLE... MOVING NORTHEAST AT 45 MPH.

* LOCATIONS THAT WILL BE AFFECTED...
  COFFIN
  MULBERRY GROVE
  GREENVILLE

MADISON COUNTY SHERIFF REPORTED ROOF DAMAGE IN NEW DOUGLAS

THE PRIMARY SEVERE WEATHER THREAT IS DAMAGING WINDS. MOVE QUICKLY
TO A STURDY BUILDING AND STAY AWAY FROM DOORS AND WINDOWS.

A TORNADO WATCH IS ALSO IN EFFECT FOR THE WARNED AREA. SEVERE
THUNDERSTORMS CAN PRODUCE TORNADOES WITH LITTLE OR NO ADVANCE
WARNING.

PEDIGO/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

Local storm report, Apr 8, 5:45 PM CDT, 4 hours 32 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ST LOUIS MISSOURI
545 PM CDT THU APR 08 1999

TIME(CDT)  .....CITY LOCATION..... STATE  ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0533 PM    NOVELTY                   MO   1 INCH HAIL
04/08/99   KNOX

0538 PM    NOVELTY                   MO   1.75 INCH HAIL
04/08/99   KNOX                           REPORTED 2 MILES WEST OF
                                          NOVELTY.

WDB
Local storm report, Apr 8, 5:45 PM CDT, 4 hours 32 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ST LOUIS MISSOURI
545 PM CDT THU APR 08 1999

TIME(CDT)  .....CITY LOCATION..... STATE  ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0533 PM    NOVELTY                   MO   1 INCH HAIL
04/08/99   KNOX

0538 PM    NOVELTY                   MO   1.75 INCH HAIL
04/08/99   KNOX                           REPORTED 2 MILES WEST OF
                                          NOVELTY.

WDB
Special weather statement, Apr 8, 7:47 PM CDT, 2 hours 30 minutes before
MOZ009-010-018-019-026-027-034-041-047-090130-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
747 PM CDT THU APR 8 1999

THE FOLLOWING COUNTIES HAVE BEEN REMOVED FROM TORNADO WATCHES 135
AND 136 IN MISSOURI:

SCOTLAND...CLARK...KNOX...LEWIS...SHELBY...MARION...MONROE...BOONE
AND MONITEAU.

THE SEVERE WEATHER THREAT HAS DIMINISHED FOR TONIGHT IN THESE
COUNTIES.

BRITT
Special weather statement, Apr 8, 7:47 PM CDT, 2 hours 30 minutes before
MOZ009-010-018-019-026-027-034-041-047-090130-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
747 PM CDT THU APR 8 1999

THE FOLLOWING COUNTIES HAVE BEEN REMOVED FROM TORNADO WATCHES 135
AND 136 IN MISSOURI:

SCOTLAND...CLARK...KNOX...LEWIS...SHELBY...MARION...MONROE...BOONE
AND MONITEAU.

THE SEVERE WEATHER THREAT HAS DIMINISHED FOR TONIGHT IN THESE
COUNTIES.

BRITT
Special weather statement, Apr 8, 8:30 PM CDT, 1 hour 47 minutes before
ILZ095-MOZ035-042-048>050-090200-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
830 PM CDT THU APR 8 1999

THE FOLLOWING COUNTIES HAVE BEEN REMOVED FROM TORNADO WATCHES 135
AND 136:

IN ILLINOIS:  PIKE COUNTY
IN MISSOURI:  RALLS...AUDRAIN...CALLAWAY...COLE AND OSAGE COUNTIES.

THE SEVERE WEATHER THREAT HAS DIMINISHED FOR TONIGHT IN THESE
COUNTIES.

BRITT
Special weather statement, Apr 8, 8:30 PM CDT, 1 hour 47 minutes before
ILZ095-MOZ035-042-048>050-090200-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE ST LOUIS MO
830 PM CDT THU APR 8 1999

THE FOLLOWING COUNTIES HAVE BEEN REMOVED FROM TORNADO WATCHES 135
AND 136:

IN ILLINOIS:  PIKE COUNTY
IN MISSOURI:  RALLS...AUDRAIN...CALLAWAY...COLE AND OSAGE COUNTIES.

THE SEVERE WEATHER THREAT HAS DIMINISHED FOR TONIGHT IN THESE
COUNTIES.

BRITT

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 8, 7:08 PM CDTTornado WarningLSXAdams47 min
Apr 8, 7:38 PM CDTTornado WarningLSXPike47 min
Apr 8, 8:27 PM CDTTornado WarningLSXGreene48 min
Apr 8, 10:20 PM CDTSevere Thunderstorm WarningLSXFayette50 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; radar from the NEXRAD Level II archive.