Alert archive / Illinois / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 36, NWS St. Louis, MO

April 9, 2001Monroe County, Illinois; Jefferson County, Missouri

NWS St. Louis, MO issued this severe thunderstorm warning at Apr 9, 2001, 10:46 PM CDT for Monroe County, Illinois; Jefferson County, Missouri. It was in force for 44 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties.

The facts

Issued
Apr 9, 2001, 10:46 PM CDT (03:46 UTC)
Expired
Apr 9, 2001, 11:30 PM CDT
In force
44 min
Issued by
NWS St. Louis, MO
Area
Whole counties; the outline is the Mesonet’s reconstruction

Counties Monroe County, IL, Jefferson County, MO

The radar

The St Louis radar (KLSX), 60 km from the middle of the area, began a volume at 03:46 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, 3.8 hours before the alert went out and 257 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 2001-04-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1891 joules per kilogram.LCLEL10008507005003002001001 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 2001-04-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 38 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
1891 J/kg
Mixed-layer CIN
-3 J/kg
Mixed-layer LCL
2017 m above ground
0-6 km bulk shear
60 kt
0-1 km storm-relative helicity
38 m²/s²
0-3 km storm-relative helicity
99 m²/s²
Significant tornado parameter
0.0
Supercell composite
3.6

Open this sounding in Storm Lab

The text

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

772 
WUUS53 KLSX 100346
SVRSTL
ILC133-MOC099-100430-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
1046 PM CDT MON APR 9 2001

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  JEFFERSON COUNTY IN EAST CENTRAL MISSOURI
  MONROE COUNTY IN SOUTHWEST ILLINOIS

* UNTIL 1130 PM CDT

* AT 1046 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM OVER FESTUS...MOVING EAST AT 45 MPH.

* LOCATIONS IN THE PATH...
  CRYSTAL CITY
  VALMEYER
  NEW DESIGN
  WATERLOO

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.

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.

LAT...LON 3834 9057 3807 9057 3814 9005 3822 8992
          3838 9010

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 9, 9:59 PM CDTSevere Thunderstorm WarningLSXPike46 min
Apr 9, 10:06 PM CDTSevere Thunderstorm WarningLSXMonroe, Saint Clair39 min
Apr 9, 10:06 PM CDTSevere Thunderstorm WarningLSXMadison39 min
Apr 9, 10:45 PM CDTSevere Thunderstorm WarningLSXSaint Clair45 min
Apr 10, 6:11 AM CDTSevere Thunderstorm WarningLSXMacoupin34 min
Apr 10, 11:32 AM CDTSevere Thunderstorm WarningLSXMacoupin, Madison43 min
Apr 10, 12:07 PM CDTSevere Thunderstorm WarningLSXBond, Montgomery38 min
Apr 10, 12:44 PM CDTSevere Thunderstorm WarningLSXFayette46 min
Apr 10, 12:54 PM CDTSevere Thunderstorm WarningLSXClinton, Washington51 min
Apr 9, 8:26 PM CDTSevere Thunderstorm WarningLSXCallaway49 min
Apr 9, 8:35 PM CDTSevere Thunderstorm WarningLSXCole, Osage40 min
Apr 9, 8:44 PM CDTSevere Thunderstorm WarningLSXFranklin46 min
Apr 9, 8:56 PM CDTSevere Thunderstorm WarningLSXSaint Charles, Saint Louis49 min
Apr 9, 8:59 PM CDTSevere Thunderstorm WarningLSXCrawford, Franklin, Gasconade46 min
Apr 9, 9:19 PM CDTSevere Thunderstorm WarningLSXWarren41 min
Apr 9, 9:29 PM CDTSevere Thunderstorm WarningLSXPike, Ralls46 min
Apr 9, 9:34 PM CDTSevere Thunderstorm WarningLSXCrawford26 min
Apr 9, 9:35 PM CDTSevere Thunderstorm WarningLSXFranklin40 min
Apr 9, 9:43 PM CDTSevere Thunderstorm WarningLSXSaint Louis, City of Saint Louis47 min
Apr 9, 10:18 PM CDTTornado WarningLSXWashington42 min
Apr 10, 1:18 AM CDTSevere Thunderstorm WarningLSXBoone42 min
Apr 10, 1:55 AM CDTSevere Thunderstorm WarningLSXAudrain50 min
Apr 10, 2:29 AM CDTSevere Thunderstorm WarningLSXPike46 min
Apr 10, 4:24 AM CDTSevere Thunderstorm WarningLSXPike36 min
Apr 10, 6:26 PM CDTTornado WarningLSXBoone, Moniteau64 min
Apr 10, 6:56 PM CDTTornado WarningLSXCallaway64 min

Nearby

Severe Thunderstorm Warnings in Illinois, 2001Severe Thunderstorm Warnings in Missouri, 2001Every severe thunderstorm warning in 2001

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.