WATCHES: Severe Thunderstorm Watch Number 485

WWUS20 KWNS 142028
SEL5
SPC WW 142028
IDZ000-ORZ000-WAZ000-150500-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 485
NWS STORM PREDICTION CENTER NORMAN OK
125 PM PDT SAT JUL 14 2012

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

IDAHO
EASTERN OREGON
SOUTHEAST WASHINGTON

EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 125 PM UNTIL
1000 PM PDT.

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 125
STATUTE MILES EITHER SIDE OF A LINE FROM 40 MILES SOUTH SOUTHWEST
OF BAKER OREGON TO 70 MILES EAST SOUTHEAST OF LOWELL IDAHO. FOR
A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU5).

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...STRONG AND SEVERE TSTMS SHOULD INCREASE IN COVERAGE AND
DEVELOP EAST ACROSS PARTS OF ERN ORE/SERN WA AND ADJACENT AREAS OF
CNTRL ID THROUGH LATE THIS AFTERNOON AND INTO THE EVENING. THIS
DEVELOPMENT IS EXPECTED TO OCCUR AS AN UPPER LOW/VORTICITY CENTER
BEGINS TO EJECT ENEWD ACROSS THE REGION. LIFT WITH THIS DISTURBANCE
WILL ACT ON A MODERATELY UNSTABLE AIRMASS WHILE A BAND OF 30-40KT
MID LEVEL FLOW PIVOTS AROUND THE EJECTING IMPULSE TO PROVIDE
SUFFICIENT EFFECTIVE SHEAR FOR STORM ORGANIZATION AND PERSISTENCE.
FARTHER EAST...ANOTHER IMPULSE MIGRATING NORTH WITHIN MONSOONAL
MOISTURE PLUME SHOULD AID STORM DEVELOPMENT AND SEVERE WIND/HAIL
POTENTIAL ACROSS SERN ID THROUGH LATE AFTERNOON.

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 450. MEAN STORM
MOTION VECTOR 25025.


...CARBIN

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