Alert archive / Illinois / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 35, NWS St. Louis, MO

April 9, 2001Saint Clair County, Illinois

NWS St. Louis, MO issued this severe thunderstorm warning at Apr 9, 2001, 10:45 PM CDT for Saint Clair County, Illinois. It was in force for 45 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: Apr 9, 2001, 10:45 PM CDT (03:45 UTC)
Expired: Apr 9, 2001, 11:30 PM CDT
In force: 45 min
Issued by: NWS St. Louis, MO
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Saint Clair County, IL

The radar

The St Louis radar (KLSX), 71 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.

What was reported inside it

Time	Report	Where	Remark
Apr 9, 11:05 PM CDT	Thunderstorm Wind 51 E	Belleville, IL	A 60-foot oak tree was blown onto a home by thunderstorm winds in Belleville. The roof and one wall were damaged.

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 00:00Z, 3.8 hours before the alert went out and 214 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: 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.

000 
WUUS53 KLSX 100345
SVRSTL
ILC163-100430-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
1045 PM CDT MON APR 9 2001

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  ST. CLAIR COUNTY IN SOUTHWEST ILLINOIS

* UNTIL 1130 PM CDT

* AT 1045 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM NEAR BELLEVILLE...MOVING EAST AT 40 MPH.

* LOCATIONS IN THE PATH...
  FREEBURG
  MASCOUTAH
  SCOTT AFB
  LEBANON

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 3866 9002 3832 9002 3824 8972 3866 8971

GLASS

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 9, 9:59 PM CDT	Severe Thunderstorm Warning	LSX	Pike	46 min
Apr 9, 10:06 PM CDT	Severe Thunderstorm Warning	LSX	Monroe, Saint Clair	39 min
Apr 9, 10:06 PM CDT	Severe Thunderstorm Warning	LSX	Madison	39 min
Apr 9, 10:46 PM CDT	Severe Thunderstorm Warning	LSX	Monroe	44 min
Apr 10, 6:11 AM CDT	Severe Thunderstorm Warning	LSX	Macoupin	34 min
Apr 10, 11:32 AM CDT	Severe Thunderstorm Warning	LSX	Macoupin, Madison	43 min
Apr 10, 12:07 PM CDT	Severe Thunderstorm Warning	LSX	Bond, Montgomery	38 min
Apr 10, 12:44 PM CDT	Severe Thunderstorm Warning	LSX	Fayette	46 min
Apr 10, 12:54 PM CDT	Severe Thunderstorm Warning	LSX	Clinton, Washington	51 min

Nearby

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