Alert archive / Mississippi / Tornado Watches in 2002

Tornado Watch 671

September 6, 20024 states

The Storm Prediction Center issued this tornado watch at Sep 6, 2002, 6:40 PM CDT for 4 states. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued
Sep 6, 2002, 6:40 PM CDT (23:40 UTC)
Expired
Sep 7, 2002, 12:00 AM CDT
In force
5 hr
Issued by
the Storm Prediction Center
All 27 counties

Baldwin County, AL, Butler County, AL, Clarke County, AL, Conecuh County, AL, Covington County, AL, Escambia County, AL, Mobile County, AL, Monroe County, AL, Washington County, AL, Escambia County, FL, Okaloosa County, FL, Santa Rosa County, FL, Orleans Parish, LA, Saint Bernard Parish, LA, Saint Tammany Parish, LA, Forrest County, MS, George County, MS, Greene County, MS, Hancock County, MS, Harrison County, MS, Jackson County, MS, Lamar County, MS, Marion County, MS, Pearl River County, MS, Perry County, MS, Stone County, MS, Wayne County, MS

The radar

The Mobile radar (KMOB), 33 km from the middle of the area, began a volume at 23:44 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.

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 11.7 hours before the alert went out and 129 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 2002-09-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 537 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 2002-09-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 88 square meters per square second.1939Sfc1 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
537 J/kg
Mixed-layer CIN
-61 J/kg
Mixed-layer LCL
1188 m above ground
0-6 km bulk shear
18 kt
0-1 km storm-relative helicity
88 m²/s²
0-3 km storm-relative helicity
93 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 062342
SEL1  
SPC WW 062340
ALZ000-FLZ000-LAZ000-MSZ000-CWZ000-070500-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 671
STORM PREDICTION CENTER NORMAN OK
640 PM CDT FRI SEP 6 2002

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

   SOUTHERN ALABAMA                            
   FAR WESTERN FLORIDA PANHANDLE                            
   FAR SOUTHEAST LOUISIANA                          
   SOUTHERN MISSISSIPPI                        
   COASTAL WATERS                     

EFFECTIVE THIS FRIDAY NIGHT AND SATURDAY MORNING FROM 640 PM UNTIL
MIDNIGHT CDT.

TORNADOES...THUNDERSTORM WIND GUSTS TO 70 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 55 MILES WEST OF GULFPORT MISSISSIPPI TO 15
MILES NORTHEAST OF CRESTVIEW FLORIDA.

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...VWP FROM MOB YIELDS AN INCREASINGLY FAVORABLE LOW
LEVEL SHEAR PROFILE FOR TORNADOES...WITH 50 KT ELY FLOW AT 3 KM. 
GIVEN AN INCREASE IN DISCRETE THUNDERSTORM DEVELOPMENT ACROSS THIS
REGION...BRIEF TORNADOES WILL BECOME MORE LIKELY THROUGH THE
EVENING.


AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH EXTREME
TURBULENCE AND SURFACE WIND GUSTS TO 60 KNOTS.  A FEW CUMULONIMBI
WITH MAXIMUM TOPS TO 350.  MEAN STORM MOTION VECTOR 11030.


...EVANS

312,0895 320,0862 295,0862 291,0895

Nearby

Tornado Watches in Mississippi, 2002Tornado Watches in Alabama, 2002Tornado Watches in Florida, 2002Every tornado watch in 2002

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.