Tornado Watch 144

Issued

Apr 15, 2011, 2:41 PM CDT (19:41 UTC)

Expired

Apr 15, 2011, 9:34 PM CDT

In force

7 hr

Issued by

the Storm Prediction Center

Largest hail expected

2 in

Strongest gust expected

60 kt

The Jackson/Brandon,MS radar (KDGX), 4 km from the middle of the area, began a volume at 19:42 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.

Two or more tornadoes

80%

One or more EF2 to EF5 tornadoes

60%

Ten or more severe wind reports

50%

One or more gusts of 65 knots or more

30%

Ten or more severe hail reports

50%

One or more hailstones of 2 inches or more

40%

Six or more combined severe hail and wind reports

90%

• Mesoscale Discussion 438Apr 15, 1:30 PM CDT
• Mesoscale Discussion 440Apr 15, 3:35 PM CDT
• Mesoscale Discussion 443Apr 15, 6:09 PM CDT
• Mesoscale Discussion 444Apr 15, 7:16 PM CDT
• Mesoscale Discussion 445Apr 15, 7:51 PM CDT

180 
WWUS20 KWNS 151946
SEL4
SPC WW 151946
LAZ000-MSZ000-CWZ000-160300-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 144
NWS STORM PREDICTION CENTER NORMAN OK
240 PM CDT FRI APR 15 2011

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

       CENTRAL AND EASTERN LOUISIANA
       CENTRAL AND SOUTHERN MISSISSIPPI
       COASTAL WATERS

EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 240 PM UNTIL
1000 PM CDT.

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 APPROXIMATELY ALONG AND 75 STATUTE
MILES EAST AND WEST OF A LINE FROM 15 MILES NORTH NORTHEAST OF
COLUMBUS MISSISSIPPI TO 15 MILES SOUTHEAST OF LAFAYETTE
LOUISIANA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU4).

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 140...WW 141...WW
142...WW 143...

DISCUSSION...PRE-FRONTAL CLUSTER OF TORNADIC SUPERCELLS OVER
PORTIONS OF CNTRL MS WILL PROGRESS EWD TOWARD THE AL BORDER WITH
ADDITIONAL STORMS INTENSIFYING THIS AFTERNOON ALONG COLD
FRONT/DRYLINE FROM WRN MS INTO CNTRL LA.  AMBIENT WARM SECTOR AIR
MASS IS WARM AND QUITE MOIST WITH MLCAPE VALUES OF 1000-2000 J/KG.
THE STRONGEST LOW-LEVEL SHEAR AND RESULTANT GREATEST SIGNIFICANT
TORNADO THREAT WILL EXIST FROM JUST E OF JAN TO MEI WHERE AMBIENT
STREAMWISE VORTICITY IS BEING AUGMENTED BY A DIFFERENTIAL
HEATING/OUTFLOW BOUNDARY.  ELSEWHERE THE COMBINATION OF EFFECTIVE
BULK SHEAR OF 50-60 KT AND EFFECTIVE SRH OF 150-300 M2/S2 WILL BE
SUPPORTIVE OF SUPERCELLS CAPABLE OF TORNADOES...LARGE HAIL AND
DAMAGING WINDS.

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 26035.


...MEAD

Tornado Watches in Mississippi, 2011Tornado Watches in Louisiana, 2011Every tornado watch in 2011

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.