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000
FXUS65 KBOI 212029
AFDBOI

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
229 PM MDT TUE MAY 21 2013

.SHORT TERM...TONIGHT THROUGH THURSDAY...LARGE STRONG CUT OFF LOW
JUST OFF THE COAST OF WASHINGTON THIS AFTERNOON WILL DRIFT SE
TOWARD THE AREA OVERNIGHT BUT THEN STALL GENERALLY OVER WASHINGTON
AND OREGON TOMORROW. A POTENT COLD FRONT WILL RACE THROUGH SE
OREGON THIS AFTERNOON AND SW IDAHO LATE THIS AFTERNOON AND THIS
EVENING. WINDS WILL GUST 30 TO 40 MPH ALONG AND A FEW HOURS BEHIND
THE FRONT. SHOWERS AND STORMS HAVE FORMED ALONG AND JUST AHEAD OF
THE FRONT...AND THESE ARE EXPECTED TO REMAIN MOSTLY NORTH OF A
LINE FROM BURNS TO ONTARIO TO FAIRFIELD. SHOWERS ARE EXPECTED TO
ALSO CONTINUE BEHIND THE FRONT THIS EVENING...MAINLY IN THE HIGHER
TERRAIN. THE COLD FRONT WILL BRING MUCH COOLER AIR INTO THE
REGION...LOWERING HIGH TEMPS BY 20 TO 25 DEGREES FOR WEDNESDAY.
SHOWERS WILL REMAIN POSSIBLE OVER THE HIGHER TERRAIN THROUGH THU
AS THE LOW REMAINS NEARLY STATIONARY. TEMPS WILL RECOVER BY 5 TO 8
DEGREES ON THU...COMPARED TO WED/S HIGHS.

.LONG TERM...THURSDAY NIGHT THROUGH TUESDAY...THE CLOSED UPPER LEVEL
LOW PRESSURE SYSTEM WILL CONTINUE TO BE ANCHORED OVER THE PACIFIC
NORTHWEST THROUGH SATURDAY. A SERIES OF SHORTWAVE TROUGHS EMBEDDED
IN THE SW FLOW OVER THE AREA WILL BRING PERIODS OF SHOWERS AND AFTERNOON
THUNDERSTORMS TO SOUTHEAST OREGON AND THE WEST CENTRAL IDAHO MOUNTAINS.
EXPECT TEMPERATURES TO BE NEAR NORMAL OR SEVERAL DEGREES BELOW NORMAL.
BY SUNDAY THE LOW CENTER WILL MOVE OFF TO OUR NORTH AND EAST AS A
SECONDARY TROUGH PUSHES INTO THE INTERMOUNTAIN WEST. MONDAY AND
BEYOND THE FLOW WILL SHIFT TO ZONAL...WITH AMPLE MOISTURE FOR A
CHANCE OF SHOWERS MAINLY OVER THE HIGHER TERRAIN. SLIGHTLY HIGHER
HEIGHTS IN THE ZONAL FLOW WILL ALLOW TEMPERATURES TO INCREASE TO
SEVERAL DEGREES ABOVE NORMAL BY TUESDAY.

&&

.AVIATION...VFR TODAY WITH A COLD FRONT MOVING THROUGH THE AREA. AHEAD
OF THE FRONT...GUSTY SE TO SW SURFACE WINDS AT 10-20 KTS WITH WINDS
REACHING 20-30 KTS AT TIMES. AT 20Z...SHOWERS AND THUNDERSTORMS ARE
SPREADING INTO SE OREGON AHEAD OF THE FRONT. THE FRONT WILL PASS THROUGH
KBNO-KBKE BETWEEN 20-21Z AND THEN PUSH THROUGH SW IDAHO FROM 00Z-03Z. SURFACE
WINDS BEHIND THE FRONT WILL BE NW AT 15-25 KTS. SHOWERS AND THUNDERSTORMS
ARE POSSIBLE WITH THE FRONTAL PASSAGE...MAINLY OVER EAST CENTRAL OREGON
AND THE WEST CENTRAL IDAHO MOUNTAINS. SW WINDS ALOFT AVERAGING 25 KTS UP
TO 10K FEET MSL.

&&

.BOI WATCHES/WARNINGS/ADVISORIES...
ID...NONE.
OR...NONE.
&&

$$

WEATHER.GOV/BOISE

SHORT TERM...SP
LONG TERM....CB/JA
AVIATION.....CB