Alert archive / Illinois / Severe Thunderstorm Warnings in 2000

Severe Thunderstorm Warning 454, NWS St. Louis, MO

September 11, 2000Calhoun County, Illinois

NWS St. Louis, MO issued this severe thunderstorm warning at Sep 11, 2000, 10:09 PM CDT for Calhoun County, Illinois. It was in force for 66 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 11, 2000, 10:09 PM CDT (03:09 UTC)
Expired: Sep 11, 2000, 11:15 PM CDT
In force: 66 min
Issued by: NWS St. Louis, MO
Area: Whole counties

County Calhoun County, IL

The radar

The St Louis radar (KLSX), 52 km from the middle of the area, began a volume at 03:11 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

Lincoln, IL (KILX), launched 00:00Z, 3.2 hours before the alert went out and 208 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 3019 J/kg
Mixed-layer CIN: -7 J/kg
Mixed-layer LCL: 1421 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 63 m²/s²
0-3 km storm-relative helicity: 140 m²/s²
Significant tornado parameter: 0.7
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 120310
SVRSTL
ILC013-MOC113-219-120415-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
1009 PM CDT MON SEP 11 2000

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  LINCOLN COUNTY IN EAST CENTRAL MISSOURI
  WARREN COUNTY IN EAST CENTRAL MISSOURI
  CALHOUN COUNTY IN WEST CENTRAL ILLINOIS

* UNTIL 1115 PM CDT

* AT 1009 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS FROM 7 MILES WEST OF BELLEVIEW ILLINOIS
  TO 22 MILES WEST OF WARRENTON MISSOURI...MOVING EAST AT 20 MPH.

* LOCATIONS IN THE PATH...
  BELLEVIEW
  HAWK POINT
  DAVIS
  WARRENTON
  TROY
  TRUESDALE
  ELSBERRY
  MOSCOW MILLS
  WRIGHT CITY

THIS STORM HAS A HISTORY OF DAMAGING WINDS. TAKE SHELTER IN A STURDY
BUILDING IMMEDIATELY.

SEVERE THUNDERSTORMS CAN PRODUCE TORNADOES WITH LITTLE OR NO ADVANCE|
WARNING. PREPARE TO MOVE TO A PLACE OF SAFETY IN A STURDY STRUCTURE
SUCH AS A BASEMENT OR SMALL INTERIOR ROOM IF A TORNADO IS SPOTTED.

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 Sep 11, 1:30 PM CDT, 8 hours 39 minutes earlier.

Area forecast discussion, Sep 11, 1:30 PM CDT, 8 hours 39 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE ST LOUIS MO
130 PM CDT MON SEP 11 2000

ETA VERY SMLR TO SUN'S RUN IN THE HANDLING OF NXT SYSTM TO AFFCT
AREA.  MODEL FCSTS 120 KT H3 JET ACRS ONT AT MIDN TNGT, WITH SGNFNT
DVRGC IN RRQ FM NRN IL INTO W CNTRL MO.  850 MSTR FCST TO POOL ALG
THE FNT WITH DEWPTS IN THE MID TEENS.  AVN AND ETA'S K INDEX FCST AT
MIDN SMLR FOR MST OF AREA WITH 40+ FM NE MO INTO SE KS.  AVN EXTNDS
HIER K'S INTO MI.

MODELS SMLR IN FCSTG MVMNT OF COLD FNT.  EXPCT FNT TO LIE NR A
LA-JLN LN BY 12Z TUE AND CLR THE AREA DURG THE AFTN.  THIS FNT WILL
CLEAN OUT THE MSTR. COOD BE A LNG TIME BEFORE WE SEE 70+ SFC DEWPTS.
HV TO WAIT UNTIL THU'S FNT TO BRING COOLR AIR DWN.

MRNG CAP WKNNG ACRS SE PTN OF AREA ON ADAP.  ISOLD CNVCNT DVLPG ACRS
NE AR INTO THE BOOTHEEL ATTM.  MSAS DATA INDICATES BTR SFC MSTR
CNVGC ACRS BOOTHEEL ATTM WITH LI'S -10 ACRS N MO.  CU FIELD AT 18Z
LINES UP PRETTY CLOSE TO WKR CIN ON LAPS DATA.  EXPCT MAIN AREA OF
DVLPMNT TO OCCUR JUST AHD OF COLD FRONT WHICH HAS NOW ENTERED THE NW
CRNR OF MO.

THE MRF, UK, AND ECMWF ARE FAIRLY SMLR FOR THU MRNG WITH NWLY FLOW
ALFT ACRS AREA WITH H5 RDG ACRS THE ROCKIES.  MRF IS MORE VIGORUS
WITH DIGGING TROF INTO THE OH VLY BY FRI THAN OTHR 2 MODELS AND
CLOSES OFF LOW OVR PA BY SAT MRNG.  UPR RDG OVR THE W DOESN'T
PERSIST VERY LONG AS WE GET CLOSR TO AUTUMN. COLD FNT FCST TO EXTND
THU MRNG FM NE IA ACRS NW CRNR OF MO INTO WRN KS. NEW AVN LTL SLOER
WITH FNT. EXPCT FNT TO ROLL ACRS MST OF THE RGN BY MIDN THU.
MODEL FCSTS DECENT BNDRY LYR AND 850 MSTR CNVGC ACRS AREA ON THU AS
FNT SLIDES ACRS.

.STL...NONE
NNNN

+

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 11, 9:10 PM CDT	Severe Thunderstorm Warning	LSX	Adams, Brown	65 min
Sep 11, 9:32 PM CDT	Severe Thunderstorm Warning	LSX	Pike	58 min
Sep 11, 10:32 PM CDT	Severe Thunderstorm Warning	LSX	Greene	58 min
Sep 11, 10:51 PM CDT	Severe Thunderstorm Warning	LSX	Jersey	39 min
Sep 11, 10:53 PM CDT	Severe Thunderstorm Warning	LSX	Macoupin	52 min
Sep 11, 11:16 PM CDT	Severe Thunderstorm Warning	LSX	Madison	59 min
Sep 12, 12:01 AM CDT	Severe Thunderstorm Warning	LSX	Monroe, Saint Clair	59 min

Nearby

Severe Thunderstorm Warnings in Illinois, 2000 Every 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; radar from the NEXRAD Level II archive.