Area Forecast Discussion
Issued by NWS Boise, ID

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000
FXUS65 KBOI 230246
AFDBOI

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
846 PM MDT TUE APR 22 2014

.DISCUSSION...SHOWERS ARE DISSIPATING FROM THE NW AS AN UPPER
LEVEL TROUGH AXIS MOVES INTO CENTRAL ID. BEHIND THE SHOWERS SKIES
WILL CLEAR OVERNIGHT AS THE AIRMASS STABILIZES. THE WESTERN MAGIC
VALLEY WILL KEEP ISOLATED TO SCATTERED SHOWERS AND ACCOMPANYING
GUSTY WINDS THROUGH MIDNIGHT THOUGH ANY THUNDERSTORM THREAT IS
GONE WITH SUNSET. SHOWERS WILL CONTINUE ACROSS THE WEST- CENTRAL
AND NORTHERN BOISE MTNS AFTER MIDNIGHT WITH NW FLOW PROVIDING WEAK
FORCING. MADE UPDATE TO TONIGHT/S FORECAST MOSTLY TO LOWER POPS
ACROSS MTN ZONES.

&&

.AVIATION...TONIGHT THROUGH THURSDAY...IN THE MOUNTAINS OF CENTRAL
IDAHO AND BAKER COUNTY OREGON SCATTERED TO NUMEROUS MVFR/IFR SNOW
SHOWERS WILL CONTINUE WITH AREAS OF TERRAIN OBSCURATION. ELSEWHERE
EXPECT VFR CONDITIONS EXCEPT FOR LOCAL MVFR CEILINGS IN SHOWERS.
SURFACE WINDS...SOUTHWEST TO NORTHWEST 10-20 KTS DECREASING TO LESS
THAN 10 KTS AFTER 06Z. WINDS ALOFT... SOUTHWEST TO WEST UP TO 25 KTS
AT 10K FT MSL.

&&

.PREV DISCUSSION...
SHORT TERM...TONIGHT THROUGH THURSDAY...UPPER LEVEL TROUGH AXIS
IS NOW PROGRESSING ACROSS THE GREAT BASIN. A SECOND COLD FRONT
BEGINNING TO MOVE THROUGH THE TREASURE VALLEY AT THIS TIME.
LIGHTNING STRIKES HAVE BEEN REPORTED NORTH OF WEISER...WEST OF
ONTARIO...AND WEST OF MELBA. EXPECT A QUICK BURST OF PRECIPITATION
WITH THIS FRONTAL PASSAGE...GUSTY WINDS UP TO 45 MPH...AND
ISOLATED CLAPS OF THUNDER AS IT MOVES EASTWARD. THUNDERSTORM
THREAT WILL DIMINISH AFTER 00Z. EXPECT A SHORT LIVED DRY PERIOD
WEDNESDAY BEFORE ANOTHER UPPER LEVEL TROUGH MOVES INLAND LATE
WEDNESDAY NIGHT. EXPECT WIDESPREAD PRECIPITATION THURSDAY WITH A
CHANCE OF THUNDERSTORMS IN THE AFTERNOON.

LONG TERM...THURSDAY NIGHT THROUGH TUESDAY...PATTERN WILL REMAIN
UNSETTLED AS ANOTHER STRONG UPPER TROUGH ENTERS THE PACIFIC
NORTHWEST FOR BELOW NORMAL TEMPS AND ABOVE NORMAL CHANCES FOR
PRECIPITATION THROUGH THE WEEKEND. A DRYING AND WARMING TREND
COMMENCES ON MONDAY AS AN UPPER RIDGE BEGINS TO AMPLIFY OVER THE
WESTERN CONUS.

&&

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

&&

$$

WEATHER.GOV/BOISE

DISCUSSION...DG
AVIATION.....JT
PREV SHORT TERM...KA
PREV LONG TERM....BW/DD



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