Alert archive / Illinois / Severe Thunderstorm Warnings in 2000

Severe Thunderstorm Warning 95, NWS St. Louis, MO

April 20, 2000Adams County, Illinois

NWS St. Louis, MO issued this severe thunderstorm warning at Apr 20, 2000, 3:46 AM CDT for Adams County, Illinois. It was in force for 49 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
Apr 20, 2000, 3:46 AM CDT (08:46 UTC)
Expired
Apr 20, 2000, 4:35 AM CDT
In force
49 min
Issued by
NWS St. Louis, MO
Area
Whole counties

County Adams County, IL

The watch it was issued in

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

IssuedProductOfficeLasted
Apr 19, 10:00 PM CDTTornado WatchSPC6 hr

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 8.8 hours before the alert went out and 190 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 2000-04-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 4 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, Davenport, at 00:00Z on 2000-04-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 471 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
4 J/kg
Mixed-layer CIN
-616 J/kg
Mixed-layer LCL
865 m above ground
0-6 km bulk shear
66 kt
0-1 km storm-relative helicity
471 m²/s²
0-3 km storm-relative helicity
491 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

Open this sounding in Storm Lab

The text

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

000 
WUUS53 KLSX 200846
SVRSTL
ILC001-200935-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
346 AM CDT THU APR 20 2000

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

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

* UNTIL 435 AM CDT

* AT 343 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM NEAR QUINCY ILLINOIS... MOVING NORTHEAST AT 60
  MPH.

* LOCATIONS THAT WILL BE AFFECTED...
  QUINCY
  CAMP POINT
  MENDON
  LA PRAIRIE



SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND GUSTS IN EXCESS OF 60
MPH...DAMAGING HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN. OMOVE
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.



WDB

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 19, 8:47 PM CDTSevere Thunderstorm WarningLSXPike33 min
Apr 19, 8:57 PM CDTSevere Thunderstorm WarningLSXCalhoun33 min
Apr 20, 4:29 AM CDTSevere Thunderstorm WarningLSXCalhoun, Pike51 min
Apr 20, 4:49 AM CDTSevere Thunderstorm WarningLSXGreene, Jersey46 min
Apr 20, 5:06 AM CDTSevere Thunderstorm WarningLSXMacoupin49 min
Apr 20, 7:18 AM CDTSevere Thunderstorm WarningLSXJersey42 min
Apr 20, 7:29 AM CDTSevere Thunderstorm WarningLSXGreene46 min
Apr 20, 8:02 AM CDTTornado WarningLSXMacoupin43 min
Apr 20, 8:54 AM CDTSevere Thunderstorm WarningLSXMontgomery51 min
Apr 20, 9:37 AM CDTSevere Thunderstorm WarningLSXBond, Clinton, Fayette48 min
Apr 20, 10:27 AM CDTSevere Thunderstorm WarningLSXFayette48 min

Nearby

Severe Thunderstorm Warnings in Illinois, 2000Every severe thunderstorm warning in 2000

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.