696
FXUS65 KBOI 220243
AFDBOI
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
843 PM MDT TUE MAY 21 2019
DISCUSSION
ISOLATED SHOWERS AND THUNDERSTORMS REMAIN SPREAD
ACROSS THE AREA THIS EVENING, BUT HAVE SHOWN SIGNS OF DECREASING
AS WE APPROACH SUNSET. THESE WILL NOT DIMINISH COMPLETELY
OVERNIGHT DUE TO THE INFLUENCE OF A LARGE UPPER LEVEL LOW TO OUR
SOUTH. THIS IS COVERED WELL BY THE CURRENT FORECAST, AND NO
CHANGES ARE PLANNED AT THIS TIME.
AVIATION
AREAS OF MVFR AND MOUNTAIN OBSCURATION IN CLOUDS AND
SHOWERS. SURFACE WINDS MAINLY NW 10 KTS OR LESS, BECOMING N 10-20
KTS AFTER 18Z WEDNESDAY. WINDS ALOFT AT 10K FT MSL N-NE 10-20 KTS.
PREV DISCUSSION
SHORT TERM...TONIGHT THROUGH FRIDAY...THE UPPER LOW SPINNING OFF
THE OREGON COASTLINE WILL CONTINUE TO BRING RAIN TO THE AREA FOR
THE REMAINDER OF THE AFTERNOON AND EVENING. ISOLATED THUNDERSTORMS
ARE EXPECTED AGAIN THIS AFTERNOON. THIS LOW TRACKS TO OUR SOUTH
WITH PRECIPITATION BEGINNING TO TAPER OFF EVER SO SLIGHTLY FOR
MUCH OF OUR AREA OVER THE NEXT FEW DAYS. FRIDAY MORNING WILL BE
THE DRIEST IN THE NEAR TERM AS WE SIT IN-BETWEEN SYSTEMS. ANOTHER
LOW DROPS DOWN INTO SOUTHERN WASHINGTON BY THE AFTERNOON BRINGING
WITH IT INCREASING PRECIPITATION. TEMPERATURES WILL REMAIN BELOW
NORMAL, BUT DO RISE THROUGHOUT THE FORECAST.
LONG TERM...SATURDAY NIGHT THROUGH TUESDAY...UPPER LEVEL LOW
ALONG THE CALIFORNIA COAST SATURDAY WILL MOVE TO ARIZONA MONDAY,
THEN ACCELERATE NORTHEAST INTO COLORADO TUESDAY. THE LOW WILL
PASS CLOSE ENOUGH TO CONTINUE SHOWERS AND AFTERNOON THUNDERSTORMS
IN THE SOUTHERN ZONES OF OUR CWA. DRYING IS EXPECTED TUESDAY FROM
WEST TO EAST. MEANWHILE, MODELS SHOW A GRADUAL WARMING TREND
THROUGH THE PERIOD WITH TEMPS FINALLY WARMING TO NORMAL BY TUESDAY.
MODELS ALSO SHOW ENOUGH INSTABILITY FOR A SLIGHT CHANCE OF
AFTERNOON THUNDERSTORMS SATURDAY THROUGH MONDAY, WHILE TUESDAY
LOOKS MORE STABLE. THE SNOW LEVEL WILL BE NEAR 8500 FEET MSL FRIDAY
NIGHT THEN RISE TO 9000 FEET SATURDAY AND BEYOND, SO SNOW WILL NOT
BE A CONCERN. SNOWMELT AND RUNOFF INTO AREA RIVERS WILL LIKELY
INCREASE BUT NOT UNTIL AFTER TUESDAY.
BOI WATCHES/WARNINGS/ADVISORIES
ID...NONE.
OR...NONE.
WWW.WEATHER.GOV/BOISE
WWW.FACEBOOK.COM/NWSBOISE
WWW.TWITTER.COM/NWSBOISE
DISCUSSION...SP
AVIATION.....JT
PREV SHORT TERM...JC
PREV LONG TERM....LC
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