Tornado Watch 83

Issued

Mar 27, 2009, 7:51 PM CDT (00:51 UTC)

Expired

Mar 28, 2009, 5:00 AM CDT

In force

9 hr

Issued by

the Storm Prediction Center

Largest hail expected

2.5 in

Strongest gust expected

70 kt

Two or more tornadoes

40%

One or more EF2 to EF5 tornadoes

20%

Ten or more severe wind reports

30%

One or more gusts of 65 knots or more

30%

Ten or more severe hail reports

40%

One or more hailstones of 2 inches or more

30%

Six or more combined severe hail and wind reports

70%

• Mesoscale Discussion 302Mar 27, 5:53 PM CDT
• Mesoscale Discussion 303Mar 27, 6:18 PM CDT
• Mesoscale Discussion 305Mar 27, 8:21 PM CDT
• Mesoscale Discussion 308Mar 27, 11:06 PM CDT
• Mesoscale Discussion 309Mar 27, 11:51 PM CDT
• Mesoscale Discussion 310Mar 28, 1:33 AM CDT
• Mesoscale Discussion 313Mar 28, 4:25 AM CDT

175 
WWUS20 KWNS 280057
SEL3  
SPC WW 280057
LAZ000-MSZ000-CWZ000-280700-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 83
NWS STORM PREDICTION CENTER NORMAN OK
750 PM CDT FRI MAR 27 2009

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

       SOUTHEAST LOUISIANA
       SOUTHERN MISSISSIPPI
       COASTAL WATERS

EFFECTIVE THIS FRIDAY NIGHT AND SATURDAY MORNING FROM 750 PM
UNTIL 200 AM CDT.

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

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 95 STATUTE
MILES EAST AND WEST OF A LINE FROM 35 MILES NORTH OF JACKSON
MISSISSIPPI TO 35 MILES EAST SOUTHEAST OF INTRACOASTAL CITY
LOUISIANA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU3).

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 78...WW 79...WW 80...WW
81...WW 82...

DISCUSSION...COMPLEX AND DANGEROUS SITUATION UNFOLDING ACROSS THE MS
DELTA REGION TONIGHT. TWO INTENSE CLUSTERS OF CONVECTION WITH
EMBEDDED SUPERCELLS ARE UNDERWAY ALONG RETURNING WARM
FRONT/OUTFLOW....ONE NOW NEAR ALLEN PARISH AND ANOTHER OVER AMITE
COUNTY MS. INCREASINGLY STRONG SLY LOW LEVEL FLOW IN ADVANCE OF
DEEPENING LARGE SCALE CYCLONE ACROSS THE ARKLATEX REGION WILL
CONTINUE TO AID WARM MOIST INFLOW INTO THIS CONVECTIVELY ACTIVE
REGION FOR SEVERAL MORE HOURS. EARLIER EVENING SOUNDINGS SUGGESTED
THAT LOW LEVEL FLOW WAS RELATIVELY LIMITED TO SUSTAIN MORE INTENSE
UPDRAFT ROTATION. HOWEVER...NOT ONLY IS THAT EXPECTED TO CHANGE
DRAMATICALLY OVER THE NEXT FEW HOURS BUT THE EARLIER SOUNDINGS
PROBABLY DID NOT ADEQUATELY SAMPLE THE LOW LEVEL SHEAR NEAR THE
FRONT AND WEAK SUB-SYNOPTIC LOWS COINCIDENT WITH THE MOST VIGOROUS
CONVECTION. THUS...STORMS WILL CONTINUE TO HAVE THE POTENTIAL TO
PRODUCE TORNADOES...ALONG WITH VERY LARGE HAIL. EVENTUALLY...EXPECT
ADVANCING COLD FRONT TO SUPPORT MORE SQUALL LINEAR DEVELOPMENT WITH
DAMAGING WINDS LIKELY LATER TONIGHT.

AVIATION...TORNADOES AND 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.


...CARBIN

Tornado Watches in Louisiana, 2009Tornado Watches in Mississippi, 2009Every tornado watch in 2009

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.