Alert archive / Illinois / Severe Thunderstorm Warnings in 2003

Severe Thunderstorm Warning 103, NWS St. Louis, MO

May 9, 2003Greene County, Illinois

NWS St. Louis, MO issued this severe thunderstorm warning at May 9, 2003, 5:56 PM CDT for Greene County, Illinois. It was in force for 49 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: May 9, 2003, 5:56 PM CDT (22:56 UTC)
Expired: May 9, 2003, 6:45 PM CDT
In force: 49 min
Issued by: NWS St. Louis, MO
Area: Counties, with a storm outline in the text

County Greene County, IL

The radar

The St Louis radar (KLSX), 87 km from the middle of the area, began a volume at 22:55 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
May 9, 4:45 PM CDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 10.9 hours before the alert went out and 173 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: 2615 J/kg
Mixed-layer CIN: -51 J/kg
Mixed-layer LCL: 727 m above ground
0-6 km bulk shear: 53 kt
0-1 km storm-relative helicity: 348 m²/s²
0-3 km storm-relative helicity: 389 m²/s²
Significant tornado parameter: 5.6
Supercell composite: 21.6

Open this sounding in Storm Lab

The text

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

482 
WUUS53 KLSX 092256
SVRLSX
ILC061-092345-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
555 PM CDT FRI MAY 9 2003

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  GREENE COUNTY IN SOUTHWEST ILLINOIS

* UNTIL 645 PM CDT

* AT 555 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 13 MILES SOUTHWEST OF WHITE HALL...MOVING
  NORTHEAST AT 30 MPH.

* LOCATIONS IMPACTED INCLUDE...
  WHITE HALL
  ROODHOUSE
  PATTERSON

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.

A TORNADO WATCH IS ALSO IN EFFECT FOR THE WARNED AREA. REMEMBER...
SEVERE THUNDERSTORMS CAN PRODUCE TORNADOES WITH LITTLE OR NO ADVANCE
WARNING.

LAT...LON 3952 9018 3926 9058 3944 9061 3952 9052

$$
JPK/MB

The office that day

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

Issued	Product	Office	Counties	Lasted
May 8, 8:21 PM CDT	Severe Thunderstorm Warning	LSX	Adams	39 min
May 8, 8:49 PM CDT	Severe Thunderstorm Warning	LSX	Adams, Brown, Pike	26 min
May 8, 10:21 PM CDT	Severe Thunderstorm Warning	LSX	Calhoun, Greene, Jersey	39 min
May 9, 5:08 PM CDT	Severe Thunderstorm Warning	LSX	Randolph	22 min
May 9, 5:43 PM CDT	Severe Thunderstorm Warning	LSX	Randolph	32 min
May 9, 6:01 PM CDT	Severe Thunderstorm Warning	LSX	Washington	44 min
May 9, 6:42 PM CDT	Severe Thunderstorm Warning	LSX	Marion	18 min
May 9, 6:42 PM CDT	Tornado Warning	LSX	Calhoun, Pike	48 min
May 9, 6:45 PM CDT	Severe Thunderstorm Warning	LSX	Greene	30 min
May 9, 6:52 PM CDT	Severe Thunderstorm Warning	LSX	Macoupin	38 min
May 9, 6:56 PM CDT	Tornado Warning	LSX	Greene, Macoupin	49 min

Nearby

Severe Thunderstorm Warnings in Illinois, 2003 Every severe thunderstorm warning in 2003

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.