Alert archive / Illinois / Tornado Warnings in 2001

Tornado Warning 17, NWS St. Louis, MO

October 24, 2001Greene County, Illinois

NWS St. Louis, MO issued this tornado warning at Oct 24, 2001, 11:17 AM CDT for Greene County, Illinois. It was in force for 43 min. 1 report came from 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, with what was reported inside it.

The facts

Issued: Oct 24, 2001, 11:17 AM CDT (16:17 UTC)
Expired: Oct 24, 2001, 12:00 PM CDT
In force: 43 min
Issued by: NWS St. Louis, MO
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Greene County, IL

The radar

The St Louis radar (KLSX), 70 km from the middle of the area, began a volume at 16:18 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

Time	Report	Where	Remark
Oct 24, 11:30 AM CDT	Hail 0.88	Greenfield, IL	Amateur radio spotters reported nickel size hail.

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 nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 4.3 hours before the alert went out and 183 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: 1102 J/kg
Mixed-layer CIN: -54 J/kg
Mixed-layer LCL: 597 m above ground
0-6 km bulk shear: 65 kt
0-1 km storm-relative helicity: 180 m²/s²
0-3 km storm-relative helicity: 226 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.0

Open this sounding in Storm Lab

The text

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

899 
WFUS53 KLSX 241617
TORSTL
ILC061-241700-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
1117 AM CDT WED OCT 24 2001

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* TORNADO WARNING FOR...
  GREENE COUNTY IN SOUTHWEST ILLINOIS

* UNTIL NOON CDT

* AT 1117 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  TORNADO OVER WOODY...MOVING NORTHEAST AT 20 MPH.

* LOCATIONS IN THE PATH...
  OLD KANE
  KANE
  CARROLLTON
  BERDAN
  BELLTOWN
  ROCKBRIDGE
  WRIGHTS
  WHITE HALL
  GREENFIELD
  ATHENSVILLE

IF YOU ARE IN THE PATH OF THIS STORM...SEEK SHELTER NOW A BASEMENT
OFFERS THE BEST PROTECTION. IF A BASEMENT IS NOT AVAILABLE...MOVE TO
THE LOWEST FLOOR AND SEEK SHELTER IN A SMALL INTERIOR ROOM. STAY AWAY
FROM OUTSIDE WALLS AND WINDOWS. MOBILE HOMES SHOULD BE ABANDONED IN
FAVOR OF A MORE SUBSTANTIAL STRUCTURE. DO NOT TRY TO OUTRUN A TORNADO
IN A VEHICLE.

THIS IS A VERY DANGEROUS STORM IF YOU ARE IN THE PATH OF THIS
TORNADO MOVE TO A SHELTER BELOW GROUND IF AVAILABLE. OTHERWISE...GO
TO A SMALL INTERIOR ROOM ON THE LOWEST FLOOR POSSIBLE. AVOID WINDOWS.
ABANDON CARS AND MOBILE HOMES FOR A STURDIER BUILDING OR GET INTO A
DITCH OR CULVERT.

LAT...LON 3922 9066 3913 9046 3924 9015 3953 9016
          3941 9046

RP

The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 23, 7:57 PM CDT	Severe Thunderstorm Warning	LSX	Calhoun, Jersey	48 min
Oct 24, 10:44 AM CDT	Severe Thunderstorm Warning	LSX	Calhoun	61 min
Oct 24, 10:44 AM CDT	Severe Thunderstorm Warning	LSX	Greene, Jersey	61 min
Oct 24, 11:40 AM CDT	Severe Thunderstorm Warning	LSX	Macoupin	50 min
Oct 24, 12:14 PM CDT	Severe Thunderstorm Warning	LSX	Jersey	61 min
Oct 24, 12:52 PM CDT	Severe Thunderstorm Warning	LSX	Madison	53 min
Oct 24, 1:00 PM CDT	Severe Thunderstorm Warning	LSX	Macoupin, Montgomery	45 min
Oct 24, 1:05 PM CDT	Severe Thunderstorm Warning	LSX	Monroe, Saint Clair	40 min
Oct 24, 1:33 PM CDT	Severe Thunderstorm Warning	LSX	Bond	42 min
Oct 24, 1:48 PM CDT	Severe Thunderstorm Warning	LSX	Fayette, Montgomery	42 min
Oct 24, 1:54 PM CDT	Severe Thunderstorm Warning	LSX	Randolph	51 min
Oct 24, 2:31 PM CDT	Tornado Warning	LSX	Randolph	29 min
Oct 24, 2:41 PM CDT	Severe Thunderstorm Warning	LSX	Fayette, Marion	49 min

Nearby

Tornado Warnings in Illinois, 2001 Every tornado warning in 2001 Tornadoes 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.