Severe Thunderstorm Watch 673

Issued

Nov 5, 2012, 2:08 PM CST (20:08 UTC)

Expired

Nov 5, 2012, 9:00 PM CST

In force

7 hr

Issued by

the Storm Prediction Center

Largest hail expected

2 in

Strongest gust expected

60 kt

The Houston radar (KHGX), 75 km from the middle of the area, began a volume at 20:10 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

20%

One or more EF2 to EF5 tornadoes

5%

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

20%

Six or more combined severe hail and wind reports

80%

• Mesoscale Discussion 2101Nov 5, 1:19 PM CST
• Mesoscale Discussion 2103Nov 5, 5:25 PM CST
• Mesoscale Discussion 2104Nov 5, 7:35 PM CST

809 
WWUS20 KWNS 052009
SEL3
SPC WW 052009
LAZ000-TXZ000-CWZ000-060300-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 673
NWS STORM PREDICTION CENTER NORMAN OK
210 PM CST MON NOV 5 2012

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

       SOUTHWEST LOUISIANA
       SOUTHEAST TEXAS
       COASTAL WATERS

EFFECTIVE THIS MONDAY AFTERNOON AND EVENING FROM 210 PM UNTIL 900
PM CST.

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

THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 55
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 65 MILES NORTHWEST
OF VICTORIA TEXAS TO 30 MILES EAST SOUTHEAST OF LAKE CHARLES
LOUISIANA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU3).

REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE
FAVORABLE FOR 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. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY
DO PRODUCE TORNADOES.

DISCUSSION...THUNDERSTORMS ARE EXPECTED TO DEVELOP THIS AFTERNOON
ALONG/AHEAD OF AN APPROACHING COLD FRONT OVER SOUTHEAST TX AND
SOUTHWEST LA.  THE AIR MASS IN THIS REGION HAS HEATED/DESTABILIZED
WITH MUCAPE VALUES OVER 2000 J/KG.  DESPITE RELATIVELY WEAK LOW
LEVEL WINDS...FAVORABLE DEEP LAYER SHEAR AND MID LEVEL LAPSE RATES
WILL PROMOTE THE RISK OF HAIL AND DAMAGING WINDS IN THE STRONGEST
CELLS.

AVIATION...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 450. MEAN STORM
MOTION VECTOR 29030.


...HART

Severe Thunderstorm Watches in Texas, 2012Severe Thunderstorm Watches in Louisiana, 2012Every severe thunderstorm watch in 2012

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.