Alert archive / Missouri / Severe Thunderstorm Watches in 2004

Severe Thunderstorm Watch 784

August 25, 2004Monroe County, Saint Clair County, Illinois; 31 counties in Missouri

The Storm Prediction Center issued this severe thunderstorm watch at Aug 25, 2004, 3:15 PM CDT for Monroe County, Saint Clair County, Illinois; 31 counties in Missouri. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
Aug 25, 2004, 3:15 PM CDT (20:15 UTC)
Expired
Aug 25, 2004, 9:00 PM CDT
In force
6 hr
Issued by
the Storm Prediction Center
All 33 counties

Monroe County, IL, Saint Clair County, IL, Camden County, MO, Carter County, MO, Christian County, MO, Cole County, MO, Crawford County, MO, Dallas County, MO, Dent County, MO, Douglas County, MO, Franklin County, MO, Gasconade County, MO, Greene County, MO, Howell County, MO, Iron County, MO, Jefferson County, MO, Laclede County, MO, Maries County, MO, Miller County, MO, Oregon County, MO, Osage County, MO, Ozark County, MO, Phelps County, MO, Pulaski County, MO, Reynolds County, MO, Saint Francois County, MO, Shannon County, MO, Stone County, MO, Taney County, MO, Texas County, MO, Washington County, MO, Webster County, MO, Wright County, MO

The radar

The Springfield radar (KSGF), 101 km from the middle of the area, began a volume at 20:16 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.

Warnings issued inside it

7 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

IssuedProductOfficeCountiesLasted
Aug 25, 3:44 PM CDTSevere Thunderstorm WarningLSXCallaway, Cole46 min
Aug 25, 5:51 PM CDTSevere Thunderstorm WarningLSXJersey, Macoupin, Madison, Saint Clair39 min
Aug 25, 6:10 PM CDTSevere Thunderstorm WarningSGFPhelps65 min
Aug 25, 6:53 PM CDTSevere Thunderstorm WarningLSXJefferson37 min
Aug 25, 6:58 PM CDTSevere Thunderstorm WarningLSXCrawford47 min
Aug 25, 7:04 PM CDTSevere Thunderstorm WarningLSXWashington41 min
Aug 25, 8:05 PM CDTSevere Thunderstorm WarningLSXSaint Francois40 min

Discussions around it

SPC mesoscale discussions over the same counties from four hours before the watch to its end.

The nearest sounding before it

Springfield, MO (KSGF), launched 12:00Z, 8.3 hours before the alert went out and 145 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, Springfield, MO at 12:00Z on 2004-08-25Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1899 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, Springfield, MO at 12:00Z on 2004-08-25The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 192 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
1899 J/kg
Mixed-layer CIN
-126 J/kg
Mixed-layer LCL
886 m above ground
0-6 km bulk shear
31 kt
0-1 km storm-relative helicity
192 m²/s²
0-3 km storm-relative helicity
156 m²/s²
Significant tornado parameter
0.0
Supercell composite
6.8

Open this sounding in Storm Lab

The text

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

000 
WWUS20 KWNS 252014
SEL4  
SPC WW 252015
MOZ000-260200-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 784
NWS STORM PREDICTION CENTER NORMAN OK
315 PM CDT WED AUG 25 2004

THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 

       SOUTHERN MISSOURI

EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 315 PM UNTIL
900 PM CDT.

HAIL TO 2.5 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 80
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE SEVERE THUNDERSTORM WATCH AREA IS ALONG AND 75 STATUTE MILES
EAST AND WEST OF A LINE FROM 40 MILES WEST SOUTHWEST OF WEST
PLAINS MISSOURI TO 45 MILES NORTHEAST OF VICHY MISSOURI.

REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE
FAVORABLE FOR SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH AREA.
PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR THREATENING
WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS AND POSSIBLE
WARNINGS. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE
TORNADOES.

OTHER WATCH INFORMATION...CONTINUE...WW 782...WW 783...

DISCUSSION...THUNDERSTORMS WILL RAPIDLY BECOME SEVERE ACROSS SRN MO
AHEAD OF S/WV TROUGH.  SHEAR PROFILES AND MLCAPES TO 3000 J/KG
SUPPORT SUPERCELLS WHICH SHOULD FAVOR LARGE HAIL AND DAMAGING WINDS.

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 70
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550. MEAN STORM
MOTION VECTOR 24030.


...HALES

363,0935 383,0923 383,0894 363,0911

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 25, 9:24 AM CDTMesoscale DiscussionSPCAdams, Brown, Calhoun, Cass, DeWitt, Fulton and 22 more2 hr
Aug 25, 11:59 AM CDTMesoscale DiscussionSPCAdams, Brown, Calhoun, Greene, Hancock, Pike and 2 more91 min
Aug 25, 12:35 PM CDTTornado WatchSPCAdams, Brown, Hancock, Henderson, Mercer, Pike6 hr
Aug 25, 1:22 PM CDTMesoscale DiscussionSPCBoone, Bureau, Carroll, Cass, Champaign, DeKalb and 42 more113 min
Aug 25, 2:20 PM CDTTornado WatchSPCBond, Brown, Calhoun, Cass, Champaign, Christian and 34 more6 hr
Aug 25, 5:14 PM CDTMesoscale DiscussionSPCBond, Brown, Calhoun, Cass, Champaign, Christian and 34 more91 min
Aug 24, 8:20 PM CDTSevere Thunderstorm WatchSPCAdair, Andrew, Atchison, Buchanan, Caldwell, Carroll and 26 more7 hr
Aug 24, 11:47 PM CDTMesoscale DiscussionSPCAndrew, Atchison, Buchanan, Caldwell, Carroll, Chariton and 22 more118 min
Aug 25, 2:14 AM CDTMesoscale DiscussionSPCAdair, Andrew, Buchanan, Caldwell, Chariton, Clinton and 14 more31 min
Aug 25, 8:50 AM CDTSevere Thunderstorm WatchSPCAndrew, Atchison, Buchanan, Daviess, DeKalb, Gentry and 6 more5 hr
Aug 25, 4:50 PM CDTMesoscale DiscussionSPCBates, Cass, Clay, Jackson, Platte, Vernon85 min
Aug 25, 5:15 PM CDTSevere Thunderstorm WatchSPCBates, Cass, Clay, Jackson, Platte5 hr

Nearby

Severe Thunderstorm Watches in Missouri, 2004Severe Thunderstorm Watches in Illinois, 2004Every severe thunderstorm watch 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.