Severe Thunderstorm Watch 84

Issued

Mar 19, 2012, 4:39 AM CDT (09:39 UTC)

Expired

Mar 19, 2012, 12:00 PM CDT

In force

7 hr

Issued by

the Storm Prediction Center

Largest hail expected

2 in

Strongest gust expected

60 kt

The San Angelo radar (KSJT), 89 km from the middle of the area, began a volume at 09:41 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

30%

One or more gusts of 65 knots or more

30%

Ten or more severe hail reports

30%

One or more hailstones of 2 inches or more

20%

Six or more combined severe hail and wind reports

70%

• Mesoscale Discussion 282Mar 19, 1:37 AM CDT
• Mesoscale Discussion 286Mar 19, 4:13 AM CDT
• Mesoscale Discussion 288Mar 19, 10:46 AM CDT

821 
WWUS20 KWNS 190943
SEL4
SPC WW 190943
TXZ000-191700-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 84
NWS STORM PREDICTION CENTER NORMAN OK
440 AM CDT MON MAR 19 2012

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

       WEST-CENTRAL TEXAS

EFFECTIVE THIS MONDAY MORNING FROM 440 AM UNTIL NOON CDT.

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 65
STATUTE MILES EAST AND WEST OF A LINE FROM 75 MILES NORTH
NORTHEAST OF ABILENE TEXAS TO 105 MILES SOUTHWEST OF SAN ANGELO
TEXAS.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED
WATCH OUTLINE UPDATE (WOUS64 KWNS WOU4).

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.

OTHER WATCH INFORMATION...CONTINUE...WW 81...WW 83...

DISCUSSION...REGENERATIVE TSTM DEVELOPMENT IS ONGOING EARLY THIS
MORNING ALONG QUASI-STATIONARY PACIFIC FRONT/DRYLINE OVER THE LOW
ROLLING PLAINS AND PERMIAN BASIN.  THE EMERGENCE OF A WEAK MIDLEVEL
IMPULSE FROM THE TX BIG BEND MAY ALLOW FOR A MORE SIGNIFICANT EWD
PUSH TO FRONT WITHIN THE NEXT FEW HOURS.  AMBIENT INFLOW ENVIRONMENT
TO ONGOING STORMS IS MOIST AND MODERATELY UNSTABLE WITH MLCAPE
VALUES OF 1000-1500 J/KG.  GIVEN THE RELATIVELY STRONG VERTICAL
SHEAR...THE SETUP WILL REMAIN FAVORABLE FOR EMBEDDED SUPERCELL AND
BOWING STRUCTURES CAPABLE OF DAMAGING WINDS AND LARGE HAIL.  A LOW
RISK FOR TORNADOES DOES EXIST...HOWEVER CONSIDERABLE COLD POOL
DEVELOPMENT /PER RADAR DATA/ AND SUBSTANTIAL CONVECTIVE INHIBITION
ARE EXPECTED TO LIMIT A MORE ROBUST THREAT.

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 500. MEAN STORM
MOTION VECTOR 23035.


...MEAD

Severe Thunderstorm Watches in Texas, 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.