Alert archive / Illinois / Severe Thunderstorm Warnings in 2004

Severe Thunderstorm Warning 308, NWS St. Louis, MO

October 18, 2004Macoupin County, Montgomery County, Illinois

NWS St. Louis, MO issued this severe thunderstorm warning at Oct 18, 2004, 5:57 PM CDT for Macoupin County, Montgomery County, Illinois. It was in force for 63 min. 7 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Oct 18, 2004, 5:57 PM CDT (22:57 UTC)
Expired: Oct 18, 2004, 7:00 PM CDT
In force: 63 min
Issued by: NWS St. Louis, MO
Area: Counties, with a storm outline in the text

Counties Macoupin County, IL, Montgomery County, IL

The radar

The St Louis radar (KLSX), 93 km from the middle of the area, began a volume at 22:58 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 18, 6:10 PM CDT	HAIL 0.75	Walshville, IL	DIME SIZED HAIL COVERING THE GROUND
Oct 18, 6:10 PM CDT	HAIL 0.75	Walshville, IL
Oct 18, 6:20 PM CDT	HAIL 1	Hillsboro, IL
Oct 18, 6:21 PM CDT	HAIL 1.75	Hillsboro, IL
Oct 18, 6:33 PM CDT	HAIL 0.75	3 Nw Litchfield, IL
Oct 18, 6:34 PM CDT	HAIL 0.25	5 N Litchfield, IL
Oct 18, 6:34 PM CDT	HAIL 1.75	Litchfield, IL

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

Did it verify

Verified. The Iowa Environmental Mesonet's Cow matched 3 storm reports to this severe thunderstorm warning; the first came 23 minutes after it went out.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The nearest sounding before it

Lincoln, IL (KILX), launched 12:00Z, 11.0 hours before the alert went out and 150 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 480 m above ground
0-6 km bulk shear: 55 kt
0-1 km storm-relative helicity: 161 m²/s²
0-3 km storm-relative helicity: 217 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 182257
SVRLSX
ILC117-135-190000-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ST LOUIS MO
557 PM CDT MON OCT 18 2004

THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHERN MONTGOMERY COUNTY IN SOUTH CENTRAL ILLINOIS     
  MACOUPIN COUNTY IN SOUTHWEST ILLINOIS

* UNTIL 700 PM CDT

* AT 557 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM OVER BUNKER HILL...MOVING EAST AT 25 MPH. THE
  PRIMARY THREAT FROM THIS STORM WILL BE DAMAGING HAIL.

* LOCATIONS IMPACTED INCLUDE...
  BENLD
  GILLESPIE
  MOUNT OLIVE
  LITCHFIELD
  TAYLOR SPRINGS
  HILLSBORO
  COFFEEN

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 3925 9016 3901 9016 3903 8926 3932 8926

$$

CVKING

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS St. Louis, MO wrote its last area forecast discussion before this severe thunderstorm warning went out at Oct 18, 3:30 PM CDT, 2 hours 27 minutes earlier.

Area forecast discussion, Oct 18, 3:30 PM CDT, 2 hours 27 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE ST LOUIS MO
330 PM CDT MON OCT 18 2004

.DISCUSSION...
ABBREVIATED DISC...SVR WX THRT WL CONT INTO E HALF OF CWA THIS EVE.
DUE TO HVY RAINS OF THIS MRNG...AND STMS TRYING TO TRAIN IN VCNTY OF
WRMFNT...WL ISSUE FLOOD WATCH THROUGH 05Z FOR E 6 COUNTIES.

WL TRY TO GET ADDL DISC ISSUED LATER ON.

&&

.LSX WATCHES/WARNINGS/ADVISORIES...
MO...NONE.
IL...NONE.

&&

TRUETT

Hazardous weather outlook, Oct 18, 12:30 PM CDT, 5 hours 27 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE ST LOUIS MO
1230 PM CDT MON OCT 18 2004

ILZ058>060-064-065-069-070-074-079-095>102-MOZ018-019-026-027-
034>036-041-042-047>052-059>065-072>075-084-085-099-191100-
ADAMS IL-AUDRAIN-BOND IL-BOONE-BROWN-CALHOUN IL-CALLAWAY-CLINTON IL-
COLE-CRAWFORD-FAYETTE IL-FRANKLIN-GASCONADE-GREENE IL-IRON-JEFFERSON-
JERSEY IL-KNOX-LEWIS-LINCOLN-MACOUPIN IL-MADISON-MADISON IL-MARION-
MARION IL-MONITEAU-MONROE-MONROE IL-MONTGOMERY-MONTGOMERY IL-OSAGE-
PIKE-PIKE IL-RALLS-RANDOLPH IL-REYNOLDS-SHELBY-ST CHARLES-
ST CLAIR IL-ST FRANCOIS-ST LOUIS-ST LOUIS CITY-STE GENEVIEVE-WARREN-
WASHINGTON-WASHINGTON IL-
500 AM CDT MON OCT 18 2004

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PARTS OF CENTRAL AND EASTERN
MISSOURI AS WELL AS WEST CENTRAL AND SOUTHWEST ILLINOIS.

.DAY ONE...TODAY AND TONIGHT

THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS THIS AFTERNOON THROUGH
EARLY TONIGHT ACROSS CENTRAL AND EASTERN MISSOURI...AND WEST CENTRAL
AND SOUTHWEST ILLINOIS. WARM UNSTABLE AIR CONTINUES TO MOVE
NORTHWARD ACROSS SOUTHERN AND CENTRAL MISSOURI AHEAD OF A DRY LINE
WHICH HAS ENTERED SOUTHWEST MISSOURI. SEVERE THUNDERSTORMS ARE
EXPECTED TO DEVELOP ALONG AND AHEAD OF THE DRY LINE AND MOVE ACROSS
PARTS OF CENTRAL AND SOUTHERN MISSOURI THIS AFTERNOON AND CONTINUE
THROUGH EARLY TONIGHT. THE THREAT WITH THE THUNDERSTORMS WILL BE
LARGE HAIL...DAMAGING WINDS...ISOLATED TORNADOES AND DEADLY
LIGHTNING.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY

THUNDERSTORMS WILL BE POSSIBLE AGAIN STARTING LATE WEDNESDAY AND
CONTINUING THROUGH FRIDAY NIGHT AS THE NEXT STORM SYSTEM MOVES
ACROSS THE CENTRAL UNITED STATES.

.SPOTTER ACTIVATION STATEMENT...

STORM SPOTTERS MAY BE NEEDED THIS AFTERNOON AND THIS EVENING.

RP

In the hours before

Local storm report, Oct 18, 4:52 PM CDT, 1 hour 5 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ST LOUIS MO
452 PM CDT MON OCT 18 2004

..TIME...   ...EVENT...     ...CITY LOCATION...      ...LAT.LON...
..DATE...   ....MAG....     ..COUNTY LOCATION...ST.. ...SOURCE....
            ..REMARKS..

0421 PM     TORNADO          1 N POTOSI              37.95N 90.78W
10/18/2004                   WASHINGTON         MO   TRAINED SPOTTER

            *** 6 INJ *** POSSIBLE TORNADO--ENTIRE BUILDING AT THE
            POTOSI LUMBER CO WAS DESTROYED.

0435 PM     TSTM WND DMG     3 S CENTERVILLE         37.39N 90.96W
10/18/2004                   REYNOLDS           MO   LAW ENFORCEMENT

            TREES DOWN AND GOLFBALL SIZED HAIL ON HWY 21

0435 PM     TORNADO          MINERAL POINT           37.95N 90.72W
10/18/2004                   WASHINGTON         MO   TRAINED SPOTTER

            2 MOBILE HOMES DESTROYED ON HWY E EAST OF POTOSI...AND
            MULTIPLE HOMES WITH ROOFS OFF...SAME LOCATION.

0440 PM     TSTM WND DMG     IRONTON                 37.60N 90.64W
10/18/2004                   IRON               MO   PUBLIC

            PUBLIC REPORTED TREES AND POWERLINES DOWN. NO STRUCTURAL
            DAMAGE...

&&

CARNEY

Local storm report, Oct 18, 4:57 PM CDT, 1 hour before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ST LOUIS MO
457 PM CDT MON OCT 18 2004

..TIME...   ...EVENT...     ...CITY LOCATION...      ...LAT.LON...
..DATE...   ....MAG....     ..COUNTY LOCATION...ST.. ...SOURCE....
            ..REMARKS..

0450 PM     HAIL             ROCKY RIDGE             37.93N 90.24W
10/18/2004  0.75 INCH        STE. GENEVIEVE     MO   FIRE DEPT/RESCUE

0455 PM     HAIL             BLOOMSDALE              38.01N 90.22W
10/18/2004  0.75 INCH        STE. GENEVIEVE     MO   TRAINED SPOTTER

&&

CARNEY

Local storm report, Oct 18, 5:09 PM CDT, 48 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ST LOUIS MO
509 PM CDT MON OCT 18 2004

..TIME...   ...EVENT...     ...CITY LOCATION...      ...LAT.LON...
..DATE...   ....MAG....     ..COUNTY LOCATION...ST.. ...SOURCE....
            ..REMARKS..

0455 PM     TORNADO          FREDERICKTOWN           37.56N 90.30W
10/18/2004                   MADISON            MO   TRAINED SPOTTER

            TORNADO SIGHTED ON THE GROUND 1 NORTH OF THE HWY 72/67
            INTERSECTION

&&

CARNEY

Local storm report, Oct 18, 5:25 PM CDT, 32 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ST LOUIS MO
525 PM CDT MON OCT 18 2004

..TIME...   ...EVENT...     ...CITY LOCATION...      ...LAT.LON...
..DATE...   ....MAG....     ..COUNTY LOCATION...ST.. ...SOURCE....
            ..REMARKS..

0455 PM     HAIL             BLOOMSDALE              38.01N 90.22W
10/18/2004  0.75 INCH        STE. GENEVIEVE     MO   LAW ENFORCEMENT

0510 PM     HAIL             OLYMPIAN VILLAGE        38.13N 90.46W
10/18/2004  0.88 INCH        JEFFERSON          MO   TRAINED SPOTTER

0520 PM     HAIL             STE. GENEVIEVE          37.97N 90.05W
10/18/2004  0.88 INCH        STE. GENEVIEVE     MO   LAW ENFORCEMENT

&&

CARNEY

Local storm report, Oct 18, 5:34 PM CDT, 23 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ST LOUIS MO
534 PM CDT MON OCT 18 2004

..TIME...   ...EVENT...     ...CITY LOCATION...      ...LAT.LON...
..DATE...   ....MAG....     ..COUNTY LOCATION...ST.. ...SOURCE....
            ..REMARKS..

0510 PM     TORNADO          CATHERINE PLACE         37.58N 90.32W
10/18/2004                   MADISON            MO   BROADCAST MEDIA

            RADIO STATION IN FREDERICKTOWN REPORTED TORNADO NEAR
            CATHERINE PLACE...WITNESSES REPORTED SEEING SHEET METAL
            BEING THROWN INTO THE AIR.

&&

CARNEY

Local storm report, Oct 18, 5:38 PM CDT, 19 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ST LOUIS MO
538 PM CDT MON OCT 18 2004

..TIME...   ...EVENT...     ...CITY LOCATION...      ...LAT.LON...
..DATE...   ....MAG....     ..COUNTY LOCATION...ST.. ...SOURCE....
            ..REMARKS..

0510 PM     TORNADO          N FREDERICKTOWN         37.56N 90.30W
10/18/2004                   MADISON            MO   TRAINED SPOTTER

            TRAILER PARK DAMAGED...NUMEROUS TREES DOWN...HWY-H
            BLOCKED BY TREES

&&

CARNEY

The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 18, 2:10 PM CDT	Severe Thunderstorm Warning	LSX	Montgomery	50 min
Oct 18, 2:58 PM CDT	Severe Thunderstorm Warning	LSX	Montgomery	32 min
Oct 18, 4:49 PM CDT	Tornado Warning	LSX	Randolph	56 min
Oct 18, 5:16 PM CDT	Severe Thunderstorm Warning	LSX	Monroe	44 min
Oct 18, 5:46 PM CDT	Severe Thunderstorm Warning	LSX	Randolph	44 min
Oct 18, 6:38 PM CDT	Severe Thunderstorm Warning	LSX	Fayette	67 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.