Severe Thunderstorm Watch 39

Issued

Mar 8, 2016, 7:03 PM CST (01:03 UTC)

Expired

Mar 9, 2016, 4:00 AM CST

In force

9 hr

Issued by

the Storm Prediction Center

Largest hail expected

2 in

Strongest gust expected

60 kt

The Austin/San Antonio radar (KEWX), 146 km from the middle of the area, began a volume at 01:03 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

40%

One or more gusts of 65 knots or more

20%

Ten or more severe hail reports

40%

One or more hailstones of 2 inches or more

30%

Six or more combined severe hail and wind reports

70%

• Mesoscale Discussion 190Mar 8, 6:25 PM CST
• Mesoscale Discussion 192Mar 8, 9:26 PM CST
• Mesoscale Discussion 193Mar 8, 11:54 PM CST

251 
WWUS20 KWNS 090059
SEL9  
SPC WW 090059
TXZ000-CWZ000-090800-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 39
NWS STORM PREDICTION CENTER NORMAN OK
700 PM CST TUE MAR 8 2016

THE NWS STORM PREDICTION CENTER HAS ISSUED A

* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 
  SOUTH CENTRAL AND DEEP SOUTH TEXAS
  COASTAL WATERS

* EFFECTIVE THIS TUESDAY NIGHT AND WEDNESDAY MORNING FROM 700 PM
  UNTIL 200 AM CST.

* PRIMARY THREATS INCLUDE...
  SCATTERED LARGE HAIL AND ISOLATED VERY LARGE HAIL EVENTS TO 2
    INCHES IN DIAMETER POSSIBLE
  SCATTERED DAMAGING WIND GUSTS TO 70 MPH POSSIBLE
  A TORNADO OR TWO POSSIBLE

SUMMARY...THUNDERSTORMS WILL INCREASE IN COVERAGE AND INTENSITY
WHILE SPREADING NORTHEASTWARD FROM THE RIO GRANDE VALLEY INTO SOUTH
TEXAS OVERNIGHT.  THE STORM ENVIRONMENT WILL PRIMARILY FAVOR LARGE
HAIL AND DAMAGING WINDS WITH BOTH SUPERCELLS AND MERGING CLUSTERS OF
STORMS.  AN ISOLATED TORNADO MAY OCCUR...MAINLY LATER TONIGHT CLOSER
TO THE MIDDLE TEXAS COAST.

THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 65
STATUTE MILES EAST AND WEST OF A LINE FROM 45 MILES NORTHWEST OF
NEW BRAUNFELS TEXAS TO 15 MILES WEST SOUTHWEST OF MCALLEN TEXAS. 
FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU9).

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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.

&&

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 24025.


...THOMPSON

Severe Thunderstorm Watches in Texas, 2016Every severe thunderstorm watch in 2016

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.