Area Forecast Discussion
Issued by NWS Boise, ID

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FXUS65 KBOI 042107
AFDBOI

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
307 PM MDT MON MAY 4 2015

.SHORT TERM...TONIGHT THROUGH WEDNESDAY...AFTERNOON SHOWER AND
THUNDERSTORM ACTIVITY DIMINISHES THIS EVENING WITH SUNSET. PERIODS
OF BRIEF HEAVY RAIN AND GUSTY WINDS TO 40 MPH WILL ACCOMPANY THE
THUNDERSTORMS. AN UPPER TROUGH DROPPING INTO THE PAC NW KEEPS
ISOLATED SHOWERS GOING OVER THE EAST-CENTRAL OREGON MTNS AND WEST-
CENTRAL ID MTNS /NORTH OF MCCALL/ OVERNIGHT. A COLD FRONT
ASSOCIATED WITH THE TROUGH ADVANCES THROUGH SOUTHEAST OREGON
TONIGHT BRINGING GUSTY WINDS. LIFT ALONG THE FRONTAL BOUNDARY
COULD PRODUCE A WEAK LINE OF SHOWERS AS IT MOVES INTO SW IDAHO
TUESDAY MORNING...BUT CONFIDENCE ON THIS SOLUTION IS LOW SO HAVE
KEPT IT OUT OF THIS FORECAST PACKAGE. TUESDAY WILL BRING COOLER...
BREEZY AND DRIER CONDITIONS TO THE AREA. ANY AFTERNOON SHOWER AND
THUNDERSTORM DEVELOPMENT WILL BE ACROSS S-CENTRAL ID ALONG THE NV
BORDER AND EASTERN BOISE AND CENTRAL MTNS TUESDAY AFTERNOON. THE
UPPER TROUGH BEGINS TO ELONGATE ON WEDNESDAY AS ENERGY DIGS ALONG
THE CASCADES. AFTERNOON INSTABILITY WILL KEEP THE THREAT OF
SHOWERS AND THUNDERSTORMS OVER THE HIGHER TERRAIN OF SW IDAHO
WHILE DYNAMICS AND INSTABILITY ALONG THE TROUGH AXIS WILL SUPPORT
SHOWERS AND STORMS OVER SE OREGON. FOR NOW THE LOWER ELEVATIONS...
TO INCLUDE THE SNAKE PLAIN...LOOK TO REMAIN DRY ON WEDNESDAY.
TEMPERATURES DROP ABOUT 10 DEGREES FROM MONDAY TO TUESDAY WITH
ANOTHER 10 DEGREE DROP FROM TUESDAY TO WEDNESDAY.

.LONG TERM...WEDNESDAY NIGHT THROUGH MONDAY...THE UPPER LEVEL LOW
WILL SPLIT FROM THE FLOW AND TRAVEL SOUTH...PASSING OVER OREGON ON
ITS WAY. THIS LOW WILL INFLUENCE OUR REGION THROUGH THE WEEKEND AS
IT MAKES ITS WAY FIRST SOUTH THEN EAST...THE REGION WILL DRY OUT ON
SUNDAY. DAILY WIDESPREAD SHOWERS AND ISOLATED THUNDERSTORMS ARE
EXPECTED EACH AFTERNOON AND EVENING DUE TO UPPER LEVEL
INSTABILITY...MOISTURE AVAILABILITY...AND DAYTIME HEATING...UNTIL
THIS WEEKEND/S DRY-OUT. ANOTHER UPPER LEVEL LOW WILL DROP SOUTH INTO
THE PACIFIC NORTHWEST SOMETIME MONDAY...BRINGING ANOTHER ROUND OF
WIDESPREAD SHOWERS TO THE REGION FOR THE BEGINNING OF NEXT WEEK.
TEMPERATURES WILL BE 5-10 DEGREES BELOW NORMAL AT THE BEGINNING OF
THE FORECAST PERIOD...REACHING NORMAL TEMPERATURES BY THE WEEKEND.

&&

.AVIATION...VFR UNDER SCATTERED MID-HIGH CLOUDS. ISOLATED SHOWERS
AND THUNDERSTORMS OVER SOUTHERN SE OREGON/BAKER COUNTY/SOUTHERN SW
IDAHO/AND OVER THE WEST CENTRAL AND BOISE MTNS...ENDING BY 5/6Z.
ISOLATED SHOWERS WILL CONTINUE INTO THE MORNING ALONG THE ID/NV
BORDER AND OVER THE BOISE/WEST CENTRAL MTNS. SURFACE WINDS...12 KTS
OR LESS. GUSTS EXPECTED NEAR THUNDERSTORMS...ALSO CHANCE OF REDUCED
VISIBILITY DUE TO BLOWING DUST...MOSTLY IN THE MAGIC VALLEY. WINDS
ALOFT NEAR 10K FT MSL...SW 5-15 KTS.

&&

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

&&

$$

WEATHER.GOV/BOISE

SHORT TERM...DG
LONG TERM....AB
AVIATION.....AB


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