Tornado Watch 902

Issued

Sep 13, 2008, 9:40 AM CDT (14:40 UTC)

Expired

Sep 13, 2008, 7:00 PM CDT

In force

9 hr

Issued by

the Storm Prediction Center

Largest hail expected

0.5 in

Strongest gust expected

60 kt

The Shreveport radar (KSHV), 68 km from the middle of the area, began a volume at 14:39 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

60%

One or more EF2 to EF5 tornadoes

50%

Ten or more severe wind reports

10%

One or more gusts of 65 knots or more

10%

Ten or more severe hail reports

5%

One or more hailstones of 2 inches or more

5%

Six or more combined severe hail and wind reports

40%

• Mesoscale Discussion 2260Sep 13, 7:01 AM CDT
• Mesoscale Discussion 2261Sep 13, 1:34 PM CDT

654 
WWUS20 KWNS 131444
SEL2  
SPC WW 131444
ARZ000-LAZ000-TXZ000-CWZ000-140000-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 902
NWS STORM PREDICTION CENTER NORMAN OK
940 AM CDT SAT SEP 13 2008

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

       SOUTHWESTERN ARKANSAS
       WESTERN LOUISIANA
       EASTERN TEXAS
       COASTAL WATERS

EFFECTIVE THIS SATURDAY MORNING AND EVENING FROM 940 AM UNTIL 700
PM CDT.

TORNADOES...HAIL TO 0.5 INCH 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 65 MILES NORTH OF SHREVEPORT
LOUISIANA TO 45 MILES SOUTH SOUTHEAST OF LAKE CHARLES LOUISIANA. 
FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU2).

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...THIS TORNADO WATCH REPLACES TORNADO
WATCH NUMBER 900. WATCH NUMBER 900 WILL NOT BE IN EFFECT AFTER
940 AM CDT. 

DISCUSSION...TORNADO THREAT WILL REMAIN ENHANCED FOR MUCH OF THE DAY
ACROSS WW TO THE EAST AND JUST NORTH OF HURRICANE IKE SHIFTING NWD
ACROSS ERN TX.  EXTREME LOW LEVEL SHEAR IN PLACE WILL MAINTAIN
FAVORABLE CONDITIONS FOR TORNADOES AS HEATING INCREASES THROUGH THE
DAY...WITH GREATEST THREAT ACROSS FAR ERN TX INTO WRN LA...SPREADING
INTO SWRN AR AND POSSIBLY FAR SERN OK LATER TODAY.  THREAT APPEARS
TO BE DIMINISHING TO THE SOUTH OF IKE AS WLY LOW LEVEL FLOW LIMITS
HELICITY.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 0.5 INCH. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
550. MEAN STORM MOTION VECTOR 19050.


...EVANS

Tornado Watches in Louisiana, 2008Tornado Watches in Texas, 2008Tornado Watches in Arkansas, 2008Every tornado watch in 2008

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.