460
FXUS65 KBOI 232041
AFDBOI
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
241 PM MDT WED SEP 23 2020
SHORT TERM...TONIGHT THROUGH FRIDAY NIGHT
NEXT SYSTEM
APPROACHING THE PACIFIC NORTHWEST COAST SPREADING CLOUDS AND SMOKE
ACROSS THE FORECAST AREA THIS AFTERNOON. AS THE FRONT APPROACHES
TONIGHT, WINDS WILL INCREASE ALONG WITH REDUCED VISIBILITIES IN
HAZE AND SMOKE. THE FRONT SHOULD MOVE ACROSS THE AREA THURSDAY
MORNING BRINGING SHOWERS MAINLY TO THE HIGHER ELEVATIONS OF BAKER
COUNTY INTO THE WEST CENTRAL MOUNTAINS OF IDAHO. BREEZY CONDITIONS
ARE EXPECTED IN THE WESTERN SNAKE RIVER PLAIN BY THURSDAY
AFTERNOON AS THE FRONT CONTINUOUS EAST. THIS SHOULD CLEAR OUT THE
SMOKE INTO THE WEEKEND AS COOL WESTERLY FLOW PREVAILS. ANOTHER
ROUND OF SHOWERS FOR THE WEST CENTRAL MOUNTAINS IS POSSIBLE FRIDAY
NIGHT WITH A WEAK SHORTWAVE PASSAGE. TEMPERATURES WILL BE NEAR
NORMAL THROUGH THE PERIOD.
LONG TERM...SATURDAY THROUGH WEDNESDAY
A SHORTWAVE TROUGH PASSING
BY TO OUR NORTH ON SATURDAY WILL BRING A CHANCE OF SHOWERS MAINLY TO
THE NORTHERN HALF OF THE FORECAST AREA. TEMPERATURES WILL RUN
SEVERAL DEGREES BELOW NORMAL WITH BREEZY AFTERNOON WINDS. AS THE
TROUGH DEPARTS, DRY CONDITIONS WILL RETURN TO THE REGION ON SUNDAY.
AN UPPER LEVEL RIDGE WILL STRENGTHEN ON SUNDAY OVER CALIFORNIA, WITH
TEMPERATURES WARMING BACK TO SLIGHTLY ABOVE NORMAL. THE RIDGE WILL
THEN AMPLIFY EARLY NEXT WEEK, EXTENDING AS FAR NORTH AS NORTHERN
CANADA BY TUESDAY AND WEDNESDAY. THIS WILL KEEP OUR AREA DRY, WARM,
AND MOSTLY CLEAR WITH TEMPERATURES WELL ABOVE NORMAL.
AVIATION
MAINLY VFR EXCEPT FOR LOCAL MVFR IN AREAS OF SMOKE. HIGH
CLOUDS WILL CONTINUE TO MOVE OVERHEAD, WITH MID LEVEL CLOUDS
INCREASING TONIGHT INTO THURSDAY. A COLD FRONT WILL BRING A CHANCE
OF RAIN SHOWERS ACROSS BAKER COUNTY AND THE WEST CENTRAL MOUNTAINS
LATE TONIGHT INTO THURSDAY. SURFACE WINDS: SOUTH TO SOUTHEAST 5-15
KT WITH GUSTS TO 20 KT, BECOMING NORTHWEST ON THURSDAY. WINDS ALOFT
NEAR 10KFT MSL: SOUTHWEST 25-40 KT.
BOI WATCHES/WARNINGS/ADVISORIES
ID...NONE.
OR...NONE.
WWW.WEATHER.GOV/BOISE
WWW.FACEBOOK.COM/NWSBOISE
WWW.TWITTER.COM/NWSBOISE
SHORT TERM...JDS
LONG TERM....ST
AVIATION.....ST
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