Severe Thunderstorm Watch 210

Issued

Apr 30, 2012, 2:36 PM MDT (20:36 UTC)

Expired

Apr 30, 2012, 9:49 PM MDT

In force

7 hr

Issued by

the Storm Prediction Center

Largest hail expected

2.5 in

Strongest gust expected

60 kt

The Amarillo radar (KAMA), 68 km from the middle of the area, began a volume at 20:37 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

70%

One or more hailstones of 2 inches or more

70%

Six or more combined severe hail and wind reports

90%

• Mesoscale Discussion 633Apr 30, 1:58 PM MDT
• Mesoscale Discussion 635Apr 30, 4:19 PM MDT
• Mesoscale Discussion 636Apr 30, 5:11 PM MDT
• Mesoscale Discussion 639Apr 30, 7:55 PM MDT
• Mesoscale Discussion 640Apr 30, 8:37 PM MDT

475 
WWUS20 KWNS 302040
SEL0  
SPC WW 302040
COZ000-KSZ000-OKZ000-TXZ000-010400-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 210
NWS STORM PREDICTION CENTER NORMAN OK
340 PM CDT MON APR 30 2012

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

       FAR SOUTHEAST COLORADO
       SOUTHWEST KANSAS
       OKLAHOMA PANHANDLE
       WESTERN TEXAS

EFFECTIVE THIS MONDAY AFTERNOON AND EVENING FROM 340 PM UNTIL
1100 PM CDT.

HAIL TO 2.5 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 80
STATUTE MILES EAST AND WEST OF A LINE FROM 55 MILES NORTH
NORTHEAST OF ELKHART KANSAS TO 50 MILES SOUTH SOUTHEAST OF
LUBBOCK TEXAS.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU0).

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 208...WW 209...

DISCUSSION...TSTMS ARE IN THE PROCESS OF DEVELOPING THIS AFTERNOON
ALONG DRYLINE WHICH HAS MIXED TO JUST E OF THE TX-NM BORDER. 
ADDITIONAL STORMS MAY DEVELOP ALONG AN OUTFLOW BOUNDARY S OF
LBB...AS WELL AS ALONG A SECONDARY BAROCLINIC ZONE OVER SWRN KS INTO
SERN CO.  WARM SECTOR AIR MASS ACROSS THE WATCH AREA IS
CHARACTERIZED BY STEEP LAPSE RATES AND BOUNDARY LAYER DEWPOINTS OF
55-60 F WITH MLCAPE VALUES RANGING FROM 1000-1500 J/KG NORTH TO
2500-3500 J/KG SOUTH.  WHEN COUPLED WITH A VERTICALLY VEERING WIND
PROFILE AND 40-45 KT OF EFFECTIVE BULK SHEAR...ENVIRONMENT IS QUITE
SUPPORTIVE OF SUPERCELLS CAPABLE OF MAINLY LARGE HAIL.  WHILE A
TORNADO IS POSSIBLE...THE GENERALLY WEAK LOW-LEVEL SHEAR AND GROWING
T-TD SPREADS WILL PRECLUDE A MORE ROBUST THREAT.

AVIATION...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 27020.


...MEAD

Severe Thunderstorm Watches in Texas, 2012Severe Thunderstorm Watches in Kansas, 2012Severe Thunderstorm Watches in Oklahoma, 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.