Alert archive / Illinois / Severe Thunderstorm Warnings in 2004

Severe Thunderstorm Warning 142, NWS St. Louis, MO

May 30, 2004Brown County, Illinois

NWS St. Louis, MO issued this severe thunderstorm warning at May 30, 2004, 4:06 PM CDT for Brown County, Illinois. It was in force for 39 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 30, 2004, 4:06 PM CDT (21:06 UTC)
Expired: May 30, 2004, 4:45 PM CDT
In force: 39 min
Issued by: NWS St. Louis, MO
Area: Counties, with a storm outline in the text

County Brown County, IL

The radar

The Lincoln radar (KILX), 132 km from the middle of the area, began a volume at 21:06 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 30, 10:50 AM CDT	Tornado Watch	SPC	8 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 9.1 hours before the alert went out and 194 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: 1629 J/kg
Mixed-layer CIN: -53 J/kg
Mixed-layer LCL: 569 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 201 m²/s²
0-3 km storm-relative helicity: 177 m²/s²
Significant tornado parameter: 1.4
Supercell composite: 8.9

Open this sounding in Storm Lab

The text

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

000 
WUUS53 KLSX 302106
SVRLSX
ILC009-302145-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
406 PM CDT SUN MAY 30 2004

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  BROWN COUNTY IN WEST CENTRAL ILLINOIS

* UNTIL 445 PM CDT

* AT 406 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM OVER BUCKHORN...MOVING NORTHEAST AT 35 MPH.

* LOCATIONS IMPACTED INCLUDE...
  MOUNT STERLING

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 3999 9102 3983 9090 3990 9047 4014 9091

$$

CVKING/FG

The office that day

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

Issued	Product	Office	Counties	Lasted
May 30, 3:27 PM CDT	Tornado Warning	LSX	Adams	48 min
May 30, 4:04 PM CDT	Severe Thunderstorm Warning	LSX	Bond, Madison, Montgomery	41 min
May 30, 4:09 PM CDT	Severe Thunderstorm Warning	LSX	Clinton, Saint Clair	51 min
May 30, 4:13 PM CDT	Tornado Warning	LSX	Bond, Madison, Montgomery	47 min
May 30, 4:20 PM CDT	Tornado Warning	LSX	Bond, Clinton, Madison, Saint Clair	40 min
May 30, 4:32 PM CDT	Severe Thunderstorm Warning	LSX	Monroe	28 min
May 30, 4:44 PM CDT	Severe Thunderstorm Warning	LSX	Fayette, Montgomery	46 min
May 30, 4:47 PM CDT	Tornado Warning	LSX	Brown	28 min
May 30, 4:48 PM CDT	Tornado Warning	LSX	Fayette, Montgomery	42 min
May 30, 4:51 PM CDT	Tornado Warning	LSX	Monroe	39 min
May 30, 4:55 PM CDT	Tornado Warning	LSX	Bond, Clinton, Fayette, Marion	50 min
May 30, 5:09 PM CDT	Severe Thunderstorm Warning	LSX	Madison	36 min
May 30, 5:19 PM CDT	Severe Thunderstorm Warning	LSX	Saint Clair	41 min
May 30, 5:44 PM CDT	Tornado Warning	LSX	Fayette	31 min
May 30, 5:50 PM CDT	Severe Thunderstorm Warning	LSX	Macoupin, Montgomery	25 min
May 30, 6:14 PM CDT	Tornado Warning	LSX	Washington	46 min
May 30, 6:36 PM CDT	Tornado Warning	LSX	Marion	39 min

Nearby

Severe Thunderstorm Warnings in Illinois, 2004 Every severe thunderstorm warning in 2004

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.