Tornado Watch 155

Issued

Apr 11, 2012, 2:11 PM MDT (20:11 UTC)

Expired

Apr 11, 2012, 9:00 PM MDT

In force

7 hr

Issued by

the Storm Prediction Center

Largest hail expected

2 in

Strongest gust expected

60 kt

The Amarillo radar (KAMA), 182 km from the middle of the area, began a volume at 20:11 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

40%

One or more EF2 to EF5 tornadoes

20%

Ten or more severe wind reports

30%

One or more gusts of 65 knots or more

30%

Ten or more severe hail reports

60%

One or more hailstones of 2 inches or more

30%

Six or more combined severe hail and wind reports

70%

• Mesoscale Discussion 489Apr 11, 1:05 PM MDT
• Mesoscale Discussion 490 Severe potential...watch possibleApr 11, 2:05 PM MDT
• Mesoscale Discussion 492Apr 11, 5:08 PM MDT
• Mesoscale Discussion 493Apr 11, 5:21 PM MDT
• Mesoscale Discussion 494Apr 11, 7:54 PM MDT

100 
WWUS20 KWNS 112011
SEL5
SPC WW 112011
COZ000-NMZ000-OKZ000-TXZ000-120300-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 155
NWS STORM PREDICTION CENTER NORMAN OK
315 PM CDT WED APR 11 2012

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

       SOUTHEAST COLORADO
       NORTHEAST NEW MEXICO
       OKLAHOMA PANHANDLE
       TEXAS PANHANDLE

EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 315 PM UNTIL
1000 PM CDT.

TORNADOES...HAIL TO 2 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 65 STATUTE
MILES NORTH AND SOUTH OF A LINE FROM 70 MILES NORTHWEST OF
CLAYTON NEW MEXICO TO 80 MILES EAST OF BORGER TEXAS.  FOR A
COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
UPDATE (WOUS64 KWNS WOU5).

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...SCATTERED THUNDERSTORMS ARE INCREASING IN COVERAGE AND
INTENSITY ALONG A REMNANT SURFACE BOUNDARY OVER THE TX/OK PANHANDLES
INTO SOUTHEAST CO.  BACKED LOW LEVEL WINDS...STRENGTHENING MID LEVEL
WESTERLIES...AND SUFFICIENT INSTABILITY WILL PROMOTE A RISK OF
SUPERCELLS CAPABLE OF LARGE HAIL...DAMAGING WINDS...AND A FEW
TORNADOES.

AVIATION...TORNADOES AND 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 30025.


...HART

Tornado Watches in Texas, 2012Tornado Watches in Colorado, 2012Tornado Watches in Oklahoma, 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.