Area Forecast Discussion
Issued by NWS Boise, ID

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134
FXUS65 KBOI 030923
AFDBOI

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
323 AM MDT TUE MAY 3 2016

.SHORT TERM...TODAY THROUGH WEDNESDAY...A HIGH-AMPLITUDE UPPER
RIDGE OVER THE INTERMOUNTAIN WEST WILL PROVIDE THE REGION WITH
CLEAR SKIES THIS MORNING. MEANWHILE...AN UPPER TROUGH IN THE
EASTERN PACIFIC WAS SLOWLY APPROACHING THE WEST COAST. BOTH
FEATURES...THE UPPER RIDGE AND TROUGH...WILL GRADUALLY SHIFT EAST
THROUGH WEDNESDAY. SOUTHERLY FLOW BETWEEN THE RIDGE AND TROUGH
WILL RESIDE OVER SE OREGON AND SW IDAHO...RESULTING IN ABOVE
NORMAL TEMPERATURES. HIGHS IN THE LOWER VALLEYS WILL BE IN THE
LOWER 80S TODAY AND MID 80S ON WEDNESDAY. MOISTURE NEAR THE
LEADING EDGE OF THE TROUGH WILL LEAD TO A SLIGHT CHANCE AFTERNOON
AND EVENING SHOWERS AND THUNDERSTORMS IN HARNEY COUNTY. THE
MOISTURE WILL CONTINUE TO SHIFT EASTWARD THROUGH WEDNESDAY...FOR
A CHANCE OF SHOWERS/SLIGHT CHANCE OF AFTERNOON THUNDERSTORMS IN SE
OREGON...AND A SLIGHT CHANCE OF AFTERNOON SHOWERS AND
THUNDERSTORMS ACROSS THE HIGHER TERRAIN OF SW IDAHO.

.LONG TERM...WEDNESDAY NIGHT THROUGH MONDAY...AN UPPER LEVEL
TROUGH ALONG THE WEST COAST ON WEDNESDAY NIGHT WILL MOVE EASTWARD
AND EVOLVE INTO A LARGE CLOSED LOW WHICH WILL DOMINATE THE WEATHER
OVER MUCH OF THE WESTERN U.S. THURSDAY THROUGH SATURDAY. THE
CLOSED LOW WILL BEGIN TO MOVE EAST AWAY FROM THE AREA ON SUNDAY.
LATEST MODEL RUNS ARE A LITTLE SLOWER WITH THE MOVEMENT OF THE
UPPER LOW TOWARDS THE EAST WHICH MEANS THAT PRECIPITATION WILL
PROBABLY WILL NOT SPREAD EAST OF THE OREGON/IDAHO BORDER UNTIL
THURSDAY. A BAND OF MODERATE PRECIPITATION MAY DEVELOP IN A
DEFORMATION ZONE ON THE NORTH SIDE OF THE LOW FRIDAY AFTERNOON AND
SATURDAY OVER SOUTHERN IDAHO. THE ATMOSPHERE WILL BE A BIT
UNSTABLE IN THE AFTERNOON EACH DAY WHICH MEANS ISOLATED
THUNDERSTORMS COULD OCCUR AS WELL. THE PRECIPITATION SHIELD
ASSOCIATED WITH THE LOW WILL PULL WELL TO THE EAST OF OREGON ON
SUNDAY AND SHOULD MOVE AWAY FROM IDAHO ON SUNDAY NIGHT WITH MOSTLY
DRY WEATHER RETURNING TO THE ENTIRE AREA ON MONDAY.

&&

.AVIATION....VFR. EXPECT CLEAR SKIES OVER IDAHO TODAY. SCATTERED
MID LEVEL CUMULUS CLOUDS AND HIGH LEVEL CIRRUS CLOUDS WILL SPREAD
INTO EASTERN OREGON THIS AFTERNOON. SURFACE WINDS WILL BE LIGHT
AND VARIABLE BEFORE NOON AND GENERALLY FROM A EASTERLY OR
SOUTHERLY DIRECTION IN THE AFTERNOON AT AROUND 10 KTS. WINDS ALOFT
SOUTHEAST TO SOUTH 10-20 KNOTS UP THROUGH 10K FEET MSL.

&&

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

&&

$$

WWW.WEATHER.GOV/BOISE
WWW.FACEBOOK.COM/NWSBOISE
WWW.TWITTER.COM/NWSBOISE

SHORT TERM...BW
LONG TERM....JB
AVIATION.....JB



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