Alert archive / Illinois / Severe Thunderstorm Warnings in 2003

Severe Thunderstorm Warning 261, NWS St. Louis, MO

August 26, 2003Brown County, Illinois

NWS St. Louis, MO issued this severe thunderstorm warning at Aug 26, 2003, 9:08 PM CDT for Brown County, Illinois. It was in force for 52 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
Aug 26, 2003, 9:08 PM CDT (02:08 UTC)
Expired
Aug 26, 2003, 10:00 PM CDT
In force
52 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), 125 km from the middle of the area, began a volume at 02:09 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

Davenport, (KDVN), launched 00:00Z, 2.1 hours before the alert went out and 182 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, Davenport, at 00:00Z on 2003-08-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2299 joules per kilogram.LCLLFCEL10008507005003002001001 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, Davenport, at 00:00Z on 2003-08-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 68 square meters per square second.193958Sfc1 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
2299 J/kg
Mixed-layer CIN
-54 J/kg
Mixed-layer LCL
1817 m above ground
0-6 km bulk shear
19 kt
0-1 km storm-relative helicity
68 m²/s²
0-3 km storm-relative helicity
85 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

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

000 
WUUS53 KLSX 270208
SVRLSX
ILC009-270300-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
903 PM CDT TUE AUG 26 2003

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

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

* UNTIL 1000 PM CDT

* AT 903 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  A NEW SEVERE THUNDERSTORM 8 MILES WEST OF BUCKHORN...MOVING EAST
  AT 20 MPH. THIS WARNING SERVES TO EXTEND THE PREVIOUS SEVERE
  THUNDERSTORM WARNING ISSUED FOR BROWN COUNTY. 

* LOCATIONS IMPACTED INCLUDE...
  BUCKHORN
  MOUNT STERLING
  VERSAILLES

MORE STORMS ARE FORMING OVER NORTHERN ADAMS COUNTY. COMMUNITIES 
IN THE HEART OF BROWN COUNTY PARTICULARLY NEAR AND JUST SOUTH OF
STATE ROUTE 24 CAN EXPECT LOCAL RAINFALL AMOUNTS POSSIBLY REACHING
TWO TO THREE INCHES. THIS WILL CREATE PONDING AND EXCESSIVE RUNOFF
ESPECIALLY IN AREAS SITH POOR RUNOFF.

THIS STORM HAS A HISTORY OF PRODUCING DAMAGING WINDS...AND MAY DOWN 
TREES AND POWER LINES. TAKE SHELTER IMMEDIATELY IN THE INTERIOR 
PORTION OF A STURDY BUILDING. STAY AWAY FROM OUTSIDE WALLS AND 
WINDOWS

LAT...LON 4011 9091 3986 9091 3985 9061 4006 9060

$$
PEDIGO

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 26, 8:13 PM CDTSevere Thunderstorm WarningLSXBrown47 min
Aug 26, 9:38 PM CDTFlash Flood WarningLSXAdams, Brown4 hr
Aug 26, 11:29 PM CDTSevere Thunderstorm WarningLSXGreene61 min

Nearby

Severe Thunderstorm Warnings in Illinois, 2003Every 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.