Area Forecast Discussion
Issued by NWS Boise, ID

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FXUS65 KBOI 230919
AFDBOI

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
319 AM MDT SAT AUG 23 2014

.SHORT TERM...TODAY THROUGH SUNDAY...UPPER LOW CENTER OVER CENTRAL
ID THIS MORNING TRACKS TO CENTRAL MT BY AFTERNOON. WRAP AROUND
MOISTURE WILL UPSLOPE OVER THE WEST CENTRAL AND BOISE MTNS KEEPING
SCATTERED SHOWERS AND THUNDERSTORMS GOING THROUGH THE DAY. MORE
STABLE AIR TO THE SOUTH AND WEST WILL CAP THE ATMOSPHERE RESULTING
IN DRY CONDITIONS ACROSS SE OREGON AND SW IDAHO FROM THE SNAKE
RIVER PLAIN TO THE NV BORDER. NW FLOW THROUGH THE MIXED LAYER WILL
BRING BREEZY CONDITIONS TODAY WHICH WILL ACCOMPANY TEMPERATURES
10-14 DEGREES BELOW NORMAL. A SECOND LOW PRESSURE SYSTEM WILL DROP
INTO THE PAC NW LATE SUNDAY. MOIST AND UNSTABLE CONDITIONS AHEAD
OF THIS FEATURE INCREASE THE CHANCE OF SHOWERS AND THUNDERSTORMS
ACROSS EAST-CENTRAL OREGON AND WEST-CENTRAL IDAHO. THE APPROACHING
LOW WILL NOT ALLOW THE AIRMASS TO MODIFY...SO SUNDAY/S HIGHS WILL
BE SIMILAR TO TODAY. HOWEVER...WINDS WILL BE LIGHTER AS THE FLOW
ALOFT WEAKENS.

.LONG TERM...SUNDAY NIGHT THROUGH FRIDAY...MODELS ARE IN FAIRLY
CLOSE AGREEMENT THROUGH THE PERIOD. SUNDAY NIGHT THROUGH TUESDAY AN
UPPER LEVEL TROUGH WILL CONTINUE TO SUPPORT ISOLATED TO SCATTERED
SHOWERS...MAINLY OVER THE HIGHER TERRAIN OF BAKER COUNTY OREGON AND
CENTRAL IDAHO. DAYTIME HIGHS WILL AVERAGE 3-8 DEGREES BELOW NORMAL
WITH OVERNIGHT LOWS CLOSE TO NORMAL. THE TROUGH WILL MOVE EAST OUT
OF OUR AREA BY WEDNESDAY...REPLACED BY THE UPPER LEVEL RIDGE WHICH
HAD BEEN RESIDING OFF THE COAST. THIS WILL BRING DRY AND WARMER
WEATHER WITH TEMPERATURES AVERAGING AROUND 5 DEGREES ABOVE NORMAL.

&&

.AVIATION...VFR. EXPECT SCATTERED TO NUMEROUS SHOWERS AND ISOLATED
AFTERNOON/EVENING THUNDERSTORMS OVER THE CENTRAL IDAHO AND BOISE
MOUNTAINS AND THE HIGHER TERRAIN OF BAKER COUNTY OREGON. SHOWERS
WILL END TONIGHT...BUT SUNDAY AFTERNOON THE CHANCE OF SHOWERS AND
THUNDERSTORMS WILL INCREASE OVER BAKER COUNTY AND THE CENTRAL IDAHO
MOUNTAINS AS ANOTHER UPPER LEVEL TROUGH MOVES SOUTH OUT OF B.C.
SURFACE WINDS...MAINLY NORTHWEST 5-15 KTS THIS MORNING AND 10-20 KTS
THIS AFTERNOON. WINDS ALOFT...NORTHWEST UP TO 20 KTS AT 10K FT MSL.

&&

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

&&

$$

WEATHER.GOV/BOISE

SHORT TERM...DG
LONG TERM....JT
AVIATION.....JT



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