WATCHES: Severe Thunderstorm Watch Number 632

WWUS20 KWNS 291948
SEL2
SPC WW 291948
AZZ000-300200-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 632
NWS STORM PREDICTION CENTER NORMAN OK
250 PM CDT SUN AUG 29 2010

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

LARGE PART OF SOUTHEAST ARIZONA

EFFECTIVE THIS SUNDAY AFTERNOON AND EVENING FROM 250 PM UNTIL 900
PM CDT.

HAIL TO 1.5 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 85
STATUTE MILES EAST AND WEST OF A LINE FROM 30 MILES WEST
NORTHWEST OF SHOW LOW ARIZONA TO 20 MILES SOUTH OF SIERRA VISTA
ARIZONA. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU2).

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.

DISCUSSION...THUNDERSTORMS ARE INCREASING IN NUMBER AND INTENSITY
ACROSS THE HIGHER ELEVATIONS OF THE WATCH AREA AS THE MDTLY UNSTABLE
AIR MASS IS VIRTUALLY UNCAPPED. WITH 25-30 KT OF SHEAR AND STEEP
LOW/MID LEVEL LAPSE RATES POTENTIAL FOR DAMAGING WINDS WILL INCREASE
THRU THE AFTERNOON AS STORMS DEVELOP INTO CLUSTERS AND MOVE OVER
ADJACENT VALLEYS.

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM
MOTION VECTOR 23025.

...HALES

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