Area Forecast Discussion
Issued by NWS Boise, ID

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000
FXUS65 KBOI 270300
AFDBOI

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
900 PM MDT SUN APR 26 2015

.DISCUSSION...IT WILL BE COLD ENOUGH FOR SPOTS OF FROST TONIGHT
THEN WARM UP TO NEAR 80 ON TUESDAY ACROSS THE LOWER
ELEVATIONS...AS IN CURRENT FORECAST. SPLIT WINDOW IR SHOWED
STRATUS EAST OF A MCCALL-IDAHO CITY LINE AS OF 840 PM THAT HAD
SHIFTED EAST THIS EVENING. LOW CLOUDS WILL CONTINUE TO DISSIPATE.
HIGH CLOUDINESS FILTERING IN FROM THE NW ON THE EAST FLANK OF THE
UPPER LEVEL RIDGE WILL BE PUSHED NE BY THE BUILDING UPPER LEVEL
RIDGE BY MONDAY EVENING. EXPECT TUESDAY TO HAVE THE WARMEST
AFTERNOON HIGH TEMPERATURES SINCE LAST OCTOBER ACROSS MOST SE
OREGON AND SW IDAHO. FORECAST ON TRACK FOR NO UPDATES.

&&

.AVIATION...VFR UNDER MOSTLY HIGH CLOUDS. SURFACE WINDS...STRONG
NORTHWESTERLY GUSTS TAPERING OFF AFTER SUNSET...BECOMING LIGHT AND
VARIABLE IN MOST LOCATIONS BETWEEN 27/3-6Z. WINDS ALOFT NEAR 10K FT
MSL...NORTHERLY 10-20 KTS...BECOMING NORTHEASTERLY 5-15 KTS AFTER
27/18Z...LIGHT AND VARIABLE BY 28/0Z.

&&

.PREV DISCUSSION...
SHORT TERM...TONIGHT THROUGH TUESDAY...A TIGHT PRESSURE GRADIENT
FROM LOW PRESSURE TO THE EAST AND HIGH PRESSURE MOVING IN FROM THE
WEST WAS RESULTING IN NW WINDS OF 20-30 MPH WITH GUSTS TO 40 MPH
FROM BOISE TO TWIN FALLS. THESE STRONGER WINDS WILL PERSIST
THROUGH EARLY THIS EVENING THEN DIMINISH AFTER SUNSET. CLOUDS WILL
DECREASE AND ISOLATED SHOWERS WILL END OVER THE CENTRAL IDAHO
MOUNTAINS /EAST OF MCCALL AND IDAHO CITY/ BY THIS EVENING AS DRIER
STABLE AIR ACCOMPANIES A BUILDING UPPER RIDGE. THIS UPPER RIDGE
WILL STRENGTHEN OVER THE REGION MONDAY...THEN SHIFT EAST TUESDAY.
A WARMING TREND WILL COMMENCE WITH THE RIDGE...WITH HIGHS WARMING
5-15 DEGREES ON MONDAY AND ANOTHER 5-10 DEGREES ON TUESDAY. SOME
VALLEY HIGHS WILL BE NEAR 80 DEGREES ON TUESDAY...BUT WELL SHORT
OF RECORDS. CLEAR SKIES AND LIGHT WINDS WILL ACCOMPANY THE RIDGE.

LONG TERM...TUESDAY NIGHT THROUGH SUNDAY...UPPER LEVEL RIDGE
OVER THE PACIFIC NORTHWEST IS PUSHED EAST AS AN UPPER LEVEL LOW IN
THE GULF OF ALASKA PUSHES A RELATIVELY DRY COLD FRONT ACROSS THE
REGION. A CHANCE OF PRECIPITATION MAINLY IN THE HIGHER TERRAIN AS
THIS SYSTEM MOVES THROUGH LATE WEDNESDAY AFTERNOON INTO THURSDAY.
SLIGHTLY COOLER TEMPERATURES AFTER THIS COLD FRONT PASSAGE. DRY
ZONAL FLOW DEVELOPS BEHIND THIS FRONT WILL KEEP TEMPERATURES
STEADY THURSDAY THROUGH SUNDAY...BUT STILL SLIGHTLY ABOVE NORMAL.

&&

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

&&

$$

WEATHER.GOV/BOISE

DISCUSSION...VM
AVIATION.....AB
PREV SHORT TERM...BW
PREV LONG TERM....KA/WH



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