Alert archive / Illinois / Severe Thunderstorm Warnings in 2000

Severe Thunderstorm Warning 420, NWS St. Louis, MO

August 23, 2000Adams County, Brown County, Illinois

NWS St. Louis, MO issued this severe thunderstorm warning at Aug 23, 2000, 6:12 PM CDT for Adams County, Brown County, Illinois. It was in force for 48 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
Aug 23, 2000, 6:12 PM CDT (23:12 UTC)
Expired
Aug 23, 2000, 7:00 PM CDT
In force
48 min
Issued by
NWS St. Louis, MO
Area
Whole counties

Counties Adams County, IL, Brown County, IL

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 11.2 hours before the alert went out and 187 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 12:00Z on 2000-08-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1458 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 12:00Z on 2000-08-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 115 square meters per square second.19395878Sfc1 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
1458 J/kg
Mixed-layer CIN
-156 J/kg
Mixed-layer LCL
692 m above ground
0-6 km bulk shear
27 kt
0-1 km storm-relative helicity
115 m²/s²
0-3 km storm-relative helicity
155 m²/s²
Significant tornado parameter
0.2
Supercell composite
5.6

Open this sounding in Storm Lab

The text

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

000 
WUUS53 KLSX 232312
SVRSTL
ILC001-009-240000-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
612 PM CDT WED AUG 23 2000

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

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

* UNTIL 700 PM CDT

* AT 612 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 6 MILES NORTHWEST OF GOLDEN...MOVING SOUTHEAST
  AT 25 MPH.

* LOCATIONS IN THE PATH...
  GOLDEN
  CAMP POINT
  CLAYTON
  BUCKHORN
  MOUNT STERLING

SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 60 MPH...
DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN. FOR YOUR
PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME
OR BUSINESS. HEAVY RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE INTO
AREAS WHERE WATER COVERS THE ROAD.

LAT...LON 4028 9107 4014 9123 3983 9083 3996 9056

TRUETT

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.

NWS St. Louis, MO wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 23, 3:47 PM CDT, 2 hours 25 minutes earlier.

Area forecast discussion, Aug 23, 3:47 PM CDT, 2 hours 25 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE ST LOUIS MO
330 PM WED AUG 23 2000

CONVECTION HAS BGN TO DVLP THIS AFTN IN NERN MO AND S CNTRL MO ALNG
OLD OUTFLOW BOUNDARIES S OF STNRY FNT EXTDG FM SRN NEBRASKA ENE THRU
NRN IL.  WKST CIN ACRS SRN MO AND A SMALL PORTION OF NERN MO WITH
CAPE OVR 4000 J/KG OVR PARTS OF NERN MO.  CONVECTION ACRS SRN MO
SHOULD BE DIURNAL...WKNG JUST AFT SUNSET...BUT ACTIVITY SHOULD BCM
MORE ORGANIZED ALONG STATIONARY FNT AS SHRTWV OVR NWRN IA ERN NE
DROPS SEWD THRU ERN MO IL LTR TGT.  MDLS DEPICT AN AREA OF UPR
DIVERGENCE ACRS ERN MO CNTRL SRN IL TGT IN RGT ENTRANCE REGION OF
ULJ STRK MOVG THRU OH VLY.  NGM...ETA AND MESOETA FAIRLY SIMILIAR
WITH HIGHEST QPF OVR NERN MO THIS EVNG DROPPING SEWD ALNG
MISSISSIPPI RVR.  18Z MESOETA SHOW INDICATIONS OF AN MCS WITH
CONVECTIVELY INDUCED VORT MAX AND OUTFLOW BOUNDARY...BUBBLE HI MOVG
SWD THRU ERN MO LT TGT.  WL INCRS POPS TGT WITH SEWD MOVG MCS
LIKELY.  PCPN CHANCES WL LIKELY SHIFT S THU AFTN AND EVNG WITH MCV
AND OUFLOW BOUNDARY...ALTHOUGH STNRY FNT WL PROBABLY ONLY DROP AS
FAR S AS NRN MO.  TEMPS SHOULD BE A COUPLE OF DGRS COOLER THU WITH
MRNG PCPN AND MCS CLOUD DEBRIS +INTO THE AFTN.

.STL...NONE
GKS

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 22, 7:28 PM CDTSevere Thunderstorm WarningLSXAdams62 min
Aug 22, 8:22 PM CDTSevere Thunderstorm WarningLSXBrown, Pike53 min
Aug 22, 9:05 PM CDTSevere Thunderstorm WarningLSXCalhoun, Greene55 min
Aug 22, 9:38 PM CDTSevere Thunderstorm WarningLSXMacoupin52 min
Aug 22, 10:20 PM CDTSevere Thunderstorm WarningLSXMontgomery40 min
Aug 22, 10:55 PM CDTSevere Thunderstorm WarningLSXMacoupin35 min
Aug 22, 11:02 PM CDTSevere Thunderstorm WarningLSXFayette, Montgomery43 min
Aug 22, 11:33 PM CDTSevere Thunderstorm WarningLSXBond, Fayette42 min
Aug 23, 12:13 AM CDTSevere Thunderstorm WarningLSXMarion62 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.