Tornado Watch 141

Issued

Apr 5, 2012, 1:53 AM CDT (06:53 UTC)

Expired

Apr 5, 2012, 11:00 AM CDT

In force

9 hr

Issued by

the Storm Prediction Center

Largest hail expected

2.5 in

Strongest gust expected

60 kt

The Jackson/Brandon,MS radar (KDGX), 130 km from the middle of the area, began a volume at 06:53 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

30%

One or more EF2 to EF5 tornadoes

20%

Ten or more severe wind reports

30%

One or more gusts of 65 knots or more

5%

Ten or more severe hail reports

50%

One or more hailstones of 2 inches or more

30%

Six or more combined severe hail and wind reports

80%

• Mesoscale Discussion 452Apr 5, 1:35 AM CDT
• Mesoscale Discussion 453Apr 5, 3:30 AM CDT
• Mesoscale Discussion 454Apr 5, 7:36 AM CDT

987 
WWUS20 KWNS 050700
SEL1
SPC WW 050700
ARZ000-LAZ000-MSZ000-051400-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 141
NWS STORM PREDICTION CENTER NORMAN OK
155 AM CDT THU APR 5 2012

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

       FAR SOUTHEAST ARKANSAS
       A LARGE PART OF LOUISIANA
       WESTERN AND CENTRAL MISSISSIPPI

EFFECTIVE THIS THURSDAY MORNING FROM 155 AM UNTIL 900 AM CDT.

TORNADOES...HAIL TO 2.5 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 80 STATUTE
MILES EAST AND WEST OF A LINE FROM 15 MILES EAST NORTHEAST OF
GREENVILLE MISSISSIPPI TO 30 MILES WEST SOUTHWEST OF BATON ROUGE
LOUISIANA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU1).

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...TSTMS HAVE FORMED OVER CNTRL AND NRN LA AND FAR SRN AR
IN THE PAST HOUR...LIKELY IN RESPONSE TO ASCENT ASSOCIATED WITH VORT
LOBE ROUNDING BASE OF NW AR UPR LOW.  ACTIVITY APPEARS TO BE FORMING
MAINLY ON WEAK SW-NE COLD FRONT THAT IS BECOMING APPARENT ONCE AGAIN
IN WAKE OF LARGE...PRE-FRONTAL MCS THAT MOVED THROUGH THE REGION
EARLY YESTERDAY.  INCREASING LOW LVL MOISTURE BENEATH DEEP EML AND
PRESENCE OF SUFFICIENT DEEP SHEAR FOR SUPERCELLS SUGGEST POTENTIAL
FOR LARGE HAIL AND DMGG WIND.  MODEST LOW LVL FLOW SHOULD LIMIT
OVERALL TORNADO THREAT.  BUT RICH LOW LVL MOISTURE...DISCRETE NATURE
OF STORMS...AND WEAK W-E BOUNDARY SE OF COLD FRONT IN CNTRL/SE LA
SUGGEST A NON-ZERO RISK FOR TORNADOES /REF MCD 452/.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
500. MEAN STORM MOTION VECTOR 26030.


...CORFIDI

Tornado Watches in Mississippi, 2012Tornado Watches in Louisiana, 2012Tornado Watches in Arkansas, 2012Every tornado 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.