Alert archive / Mississippi / Tornado Watches in 2001

Tornado Watch 839

November 29, 2001Baldwin County, Mobile County, Alabama; Saint Bernard Parish, Louisiana; 6 counties in Mississippi

The Storm Prediction Center issued this tornado watch at Nov 29, 2001, 10:00 AM CST for Baldwin County, Mobile County, Alabama; Saint Bernard Parish, Louisiana; 6 counties in Mississippi. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued
Nov 29, 2001, 10:00 AM CST (16:00 UTC)
Expired
Nov 29, 2001, 3:00 PM CST
In force
5 hr
Issued by
the Storm Prediction Center

Counties Baldwin County, AL, Mobile County, AL, Saint Bernard Parish, LA, George County, MS, Hancock County, MS, Harrison County, MS, Jackson County, MS, Pearl River County, MS, Stone County, MS

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 4.0 hours before the alert went out and 128 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, Slidell Radar S, LA at 12:00Z on 2001-11-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1609 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Slidell Radar S, LA at 12:00Z on 2001-11-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 241 square meters per square second.19395878Sfc1 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
1609 J/kg
Mixed-layer CIN
-1 J/kg
Mixed-layer LCL
492 m above ground
0-6 km bulk shear
35 kt
0-1 km storm-relative helicity
241 m²/s²
0-3 km storm-relative helicity
286 m²/s²
Significant tornado parameter
1.9
Supercell composite
10.1

Open this sounding in Storm Lab

The text

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

000 
WWUS20 KWNS 291556
SEL9  

SEL9  
SPC WW 291549
ALZ000-LAZ000-MSZ000-CWZ000-292100-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 839
STORM PREDICTION CENTER NORMAN OK
949 AM CST THU NOV 29 2001

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

   SOUTHWEST ALABAMA                            
   EXTREME SOUTHEAST LOUISIANA                          
   SOUTHEAST MISSISSIPPI                        
   COASTAL WATERS                     

EFFECTIVE THIS THURSDAY MORNING AND AFTERNOON FROM 1000 AM UNTIL
300 PM CST.

TORNADOES...HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS
TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE TORNADO WATCH AREA IS ALONG AND 75 STATUTE MILES EAST AND WEST
OF A LINE FROM 45 MILES NORTH NORTHEAST OF GULFPORT MISSISSIPPI TO
60 MILES EAST OF BOOTHVILLE LOUISIANA.

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.

OTHER WATCH INFORMATION...  CONTINUE...WW 838...

DISCUSSION...NWRN GULF OF MEXICO UPPER TROUGH IS BEGINNING TO EJECT
NE ACROSS THE LWR MS VLY.  STRENGTHENING LARGE SCALE ASCENT/
PRESSURE FALLS AHEAD OF ASSOCIATED COLD FRONT...ALONG WITH DAYTIME
HEATING...WILL CREATE INCREASINGLY FAVORABLE ENVIRONMENT FOR
SUPERCELL DEVELOPMENT OVER WW AREA.  COUPLED WITH RICH BOUNDARY
LAYER MOISTURE INFLOW...SETUP APPEARS FAVORBALE FOR A COUPLE
TORNADOES IN ADDITION TO DAMAGING WINDS AND POSSIBLY HAIL.  

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 2 INCHES.  EXTREME TURBULENCE AND SURFACE WIND
GUSTS TO 60 KNOTS.  A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. 
MEAN STORM MOTION VECTOR 22045.

...CORFIDI

310,0873 291,0870 291,0893 310,0900

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Nov 29, 12:00 PM CSTTornado WatchSPCAutauga, Bibb, Blount, Butler, Chilton, Choctaw and 36 more5 hr
Nov 29, 4:15 AM CSTSevere Thunderstorm WatchSPCAcadia, Allen, Avoyelles, Beauregard, Calcasieu, Caldwell and 21 more5 hr
Nov 29, 8:15 AM CSTTornado WatchSPCEast Carroll, East Feliciana, Madison, Saint Helena, Tensas, Washington and 1 more5 hr

Nearby

Tornado Watches in Mississippi, 2001Tornado Watches in Alabama, 2001Tornado Watches in Louisiana, 2001Every tornado watch in 2001

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.