Alert archive / Louisiana / Tornado Watches in 2001

Tornado Watch 835

November 28, 200130 parishes in Louisiana; 21 counties in Mississippi

The Storm Prediction Center issued this tornado watch at Nov 28, 2001, 11:00 AM CST for 30 parishes in Louisiana; 21 counties in Mississippi. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued: Nov 28, 2001, 11:00 AM CST (17:00 UTC)
Expired: Nov 28, 2001, 4:00 PM CST
In force: 5 hr
Issued by: the Storm Prediction Center

All 51 counties

Acadia Parish, LA, Allen Parish, LA, Ascension Parish, LA, Avoyelles Parish, LA, Beauregard Parish, LA, Calcasieu Parish, LA, Cameron Parish, LA, Catahoula Parish, LA, Concordia Parish, LA, East Baton Rouge Parish, LA, East Feliciana Parish, LA, Evangeline Parish, LA, Grant Parish, LA, Iberville Parish, LA, Jefferson Davis Parish, LA, Lafayette Parish, LA, LaSalle Parish, LA, Livingston Parish, LA, Pointe Coupee Parish, LA, Rapides Parish, LA, Saint Helena Parish, LA, Saint Landry Parish, LA, Saint Martin Parish, LA, Tangipahoa Parish, LA, Tensas Parish, LA, Vermilion Parish, LA, Vernon Parish, LA, Washington Parish, LA, West Baton Rouge Parish, LA, West Feliciana Parish, LA, Adams County, MS, Amite County, MS, Claiborne County, MS, Copiah County, MS, Covington County, MS, Franklin County, MS, Hinds County, MS, Jefferson County, MS, Jefferson Davis County, MS, Lamar County, MS, Lawrence County, MS, Lincoln County, MS, Marion County, MS, Pearl River County, MS, Pike County, MS, Rankin County, MS, Scott County, MS, Simpson County, MS, Smith County, MS, Walthall County, MS, Wilkinson County, MS

The radar

The Ft Polk radar (KPOE), 98 km from the middle of the area, began a volume at 16:59 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

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

Issued	Product	Office	Counties	Lasted
Nov 28, 1:47 PM CST	Severe Thunderstorm Warning	LCH	Rapides	58 min
Nov 28, 3:10 PM CST	Severe Thunderstorm Warning	LCH	Calcasieu	65 min
Nov 28, 3:53 PM CST	Severe Thunderstorm Warning	LCH	Allen, Jefferson Davis	67 min

The nearest sounding before it

Lake Charles Mun, LA (KLCH), launched 12:00Z, 5.0 hours before the alert went out and 160 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: 1980 J/kg
Mixed-layer CIN: -1 J/kg
Mixed-layer LCL: 487 m above ground
0-6 km bulk shear: 60 kt
0-1 km storm-relative helicity: 199 m²/s²
0-3 km storm-relative helicity: 237 m²/s²
Significant tornado parameter: 2.9
Supercell composite: 10.6

Open this sounding in Storm Lab

The text

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

000 
WWUS20 KWNS 281700
SEL5  
SPC WW 281653
LAZ000-MSZ000-CWZ000-282200-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 835
STORM PREDICTION CENTER NORMAN OK
1053 AM CST WED NOV 28 2001

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

   SOUTHERN LOUISIANA                          
   SOUTHERN AND WESTERN MISSISSIPPI                        
   COASTAL WATERS                     

EFFECTIVE THIS WEDNESDAY MORNING AND AFTERNOON FROM 1100 AM UNTIL
400 PM CST.

TORNADOES...HAIL TO 1 INCH IN DIAMETER...THUNDERSTORM WIND GUSTS TO
60 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE TORNADO WATCH AREA IS ALONG AND 75 STATUTE MILES NORTH AND
SOUTH OF A LINE FROM 30 MILES WEST NORTHWEST OF LAKE CHARLES
LOUISIANA TO 60 MILES SOUTHEAST OF JACKSON 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...HIGH LEVEL IMPULSE LIFTING NNE FROM THE WRN GULF OF
MEXICO APPEARS TO BE ENHANCING LARGE SCALE ASCENT ALONG AND S/E OF
STALLED BOUNDARIES OVER SRN LA.  AMPLE /50+ KT/ DEEP SHEAR IS
PRESENT OVER REGION TO SUPPORT SUPERCELLS.  MODEST DEGREE OF LOW
LEVEL DIRECTIONAL SHEAR...COUPLED WITH RICH BOUNDARY LAYER MOISTURE
INFLUX /DEWPOINTS IN THE 70S/ AND DISCRETE NATURE OF DEVELOPING
CELLS SUGGEST POTENTIAL FOR TORNADOES WITH SUSTAINED STORMS.
    
AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 1 INCH...EXTREME TURBULENCE AND SURFACE WIND
GUSTS TO 50 KNOTS.  A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. 
MEAN STORM MOTION VECTOR 21030.

...CORFIDI

303,0892 291,0934 312,0934 324,0892

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Nov 27, 8:30 PM CST	Tornado Watch	SPC	Calcasieu, Cameron	5 hr
Nov 28, 2:45 PM CST	Tornado Watch	SPC	Acadia, Allen, Avoyelles, Beauregard, Calcasieu, Caldwell and 24 more	5 hr

Nearby

Tornado Watches in Louisiana, 2001 Tornado Watches in Mississippi, 2001 Every 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; radar from the NEXRAD Level II archive.