Alert archive / Mississippi / Tornado Watches in 2004

Tornado Watch 922

December 22, 2004Choctaw County, Clarke County, Washington County, Alabama; 20 parishes in Louisiana; 22 counties in Mississippi

The Storm Prediction Center issued this tornado watch at Dec 22, 2004, 2:45 PM CST for Choctaw County, Clarke County, Washington County, Alabama; 20 parishes in Louisiana; 22 counties in Mississippi. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued: Dec 22, 2004, 2:45 PM CST (20:45 UTC)
Expired: Dec 22, 2004, 9:00 PM CST
In force: 6 hr
Issued by: the Storm Prediction Center

All 45 counties

Choctaw County, AL, Clarke County, AL, Washington County, AL, Ascension Parish, LA, Assumption Parish, LA, East Baton Rouge Parish, LA, East Feliciana Parish, LA, Iberia Parish, LA, Iberville Parish, LA, Jefferson Parish, LA, Lafourche Parish, LA, Livingston Parish, LA, Orleans Parish, LA, Saint Charles Parish, LA, Saint Helena Parish, LA, Saint James Parish, LA, Saint John the Baptist Parish, LA, Saint Martin Parish, LA, Saint Tammany Parish, LA, St. Mary Parish, LA, Tangipahoa Parish, LA, Washington Parish, LA, West Baton Rouge Parish, LA, Amite County, MS, Covington County, MS, Forrest County, MS, George County, MS, Greene County, MS, Hancock County, MS, Harrison County, MS, Jasper County, MS, Jefferson Davis County, MS, Jones County, MS, Lamar County, MS, Lawrence County, MS, Lincoln County, MS, Marion County, MS, Pearl River County, MS, Perry County, MS, Pike County, MS, Simpson County, MS, Smith County, MS, Stone County, MS, Walthall County, MS, Wayne County, MS

Warnings issued inside it

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

Issued	Product	Office	Counties	Lasted
Dec 22, 3:20 PM CST	Severe Thunderstorm Warning	LIX	Amite, Pike, Wilkinson	55 min
Dec 22, 3:44 PM CST	Severe Thunderstorm Warning	LIX	East Baton Rouge, Iberville, Livingston, Pointe Coupee, West Baton Rouge	61 min
Dec 22, 4:10 PM CST	Severe Thunderstorm Warning	LIX	Amite, Pike, Walthall	65 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

Slidell Radar S, LA (KSIL), launched 12:00Z, 8.8 hours before the alert went out and 84 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: 75 J/kg
Mixed-layer CIN: -28 J/kg
Mixed-layer LCL: 579 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 177 m²/s²
0-3 km storm-relative helicity: 242 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 
WWUS20 KWNS 222048
SEL2  
SPC WW 222045
LAZ000-MSZ000-CWZ000-230300-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 922
NWS STORM PREDICTION CENTER NORMAN OK
245 PM CST WED DEC 22 2004

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

       SOUTHEASTERN LOUISIANA
       SOUTHERN MISSISSIPPI
       COASTAL WATERS

EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 245 PM UNTIL
900 PM CST.

TORNADOES...HAIL TO 1.5 INCHES IN DIAMETER...THUNDERSTORM WIND
GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE
AREAS.

THE TORNADO WATCH AREA IS ALONG AND 85 STATUTE MILES EAST AND WEST
OF A LINE FROM 40 MILES WEST SOUTHWEST OF HOUMA LOUISIANA TO 35
MILES NORTHEAST OF LAUREL MISSISSIPPI.

REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR
TORNADOES AND 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.

DISCUSSION...DEEPENING SURFACE LOW MOVING NEWD INTO SWRN MS WITH
WARM SECTOR ACROSS SERN LA/SRN MS BECOMING SUFFICIENTLY UNSTABLE TO
SUPPORT SUPERCELL/TORNADO POTENTIAL.  VERY STRONG SHEAR PROFILES IN
PLACE AS UPPER TROUGH MOVES ACROSS ERN TX FOR ROTATING STORMS ALONG
AND AHEAD OF STRONG COLD FRONT AND DEVELOPING SURFACE LOW.  LOW WILL
TRACK NEWD ACROSS SRN MS INTO W CENTRAL AL BY LATER THIS EVENING.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
500. MEAN STORM MOTION VECTOR 24045.


...HALES

292,0924 320,0901 320,0871 292,0895

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Dec 22, 4:58 PM CST	Mesoscale Discussion	SPC	Baldwin, Escambia, Mobile	62 min
Dec 21, 6:46 PM CST	Mesoscale Discussion	SPC	Bossier, Caddo	119 min
Dec 22, 11:25 AM CST	Mesoscale Discussion	SPC	Acadia, Allen, Ascension, Assumption, Avoyelles, Cameron and 19 more	95 min
Dec 22, 2:28 PM CST	Mesoscale Discussion	SPC	Ascension, Assumption, East Baton Rouge, East Feliciana, Iberia, Iberville and 21 more	92 min

Nearby

Tornado Watches in Mississippi, 2004 Tornado Watches in Louisiana, 2004 Tornado Watches in Alabama, 2004 Every tornado 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.