447
FXUS65 KBOI 011604
AFDBOI
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
1004 AM MDT TUE APR 1 2025
DISCUSSION
MORNING SATELLITE IMAGERY SHOWING MAIN UPPER LOW
PUSHING ONTO THE SW OREGON COAST. OVERNIGHT SHOWERS HAVE
DISSIPATED, BUT WILL REFORM THIS AFTERNOON WITH DAYTIME
INSTABILITY. INITIATION WILL BE OVER HIGHER TERRAIN WITH A BROAD
20-40% CHANCE OF SHOWERS, WHILE AREAS ALONG NORTHERN NV BORDER
SEE MORE WIDESPREAD COVERAGE (60-80%). SNOW LEVELS ARE LOW
ENOUGH FOR SNOW OR RAIN/SNOW DOWN TO VALLEY FLOORS THROUGH THIS
AFTERNOON AND WIND GUSTS TO AROUND 30 MPH ARE POSSIBLE FROM
STRONGER SHOWERS. HAVE UPDATED THE FORECAST MOSTLY TO LOWER
PRECIPITATION CHANCES FOR THE REST OF THIS MORNING.
AVIATION
MAINLY VFR. RAIN/SNOW SHOWERS DECREASING THIS
MORNING. THEN, NUMEROUS SHOWERS AND ISOLATED THUNDERSTORMS
DEVELOPING THIS AFTERNOON, MAINLY OVER THE HIGHER TERRAIN. SNOW
LEVELS 3000-4000 FT MSL. PERIODS OF MVFR IN RAIN, MVFR TO LIFR
IN SNOW. MOUNTAINS OBSCURED AT TIMES. SURFACE WINDS: SW-NW 5-15
KT. GUSTS TO 30 KT IN THE MAGIC VALLEY/OWYHEE MOUNTAINS LATER
THIS MORNING AND AFTERNOON. WINDS ALOFT AT 10KFT: W-NW 15-30 KT.
KBOI...MAINLY VFR. A 10% CHANCE OF RAIN SHOWERS AND A STRAY
THUNDERSTORM THIS AFTERNOON WITH A RAIN-SNOW MIX OVERNIGHT. MVFR
EXPECTED IN SHOWERS, EXCEPT IFR POSSIBLE WITH SNOW OVERNIGHT.
SURFACE WINDS: VARIABLE LESS THAN 5 KT THIS MORNING THEN NW 6-10
KT, WITH AFTERNOON GUSTS TO 15-20 KT.
PREV DISCUSSION
SHORT TERM...TODAY THROUGH THURSDAY NIGHT...INSTABILITY RAIN
AND SNOW SHOWERS AND ISOLATED THUNDERSTORMS AGAIN TODAY, BUT
WEAKER THAN YESTERDAY AS THE MAIN COASTAL UPPER LOW SEPARATES
INTO TWO WEAKER CENTERS AS IT MOVES INLAND. ONE CENTER WILL
MOVE TO WESTERN WYOMING LATER TODAY WHILE THE OTHER CENTER
DIGS SOUTHWARD INTO CALIFORNIA. THIS SHOULD LEAVE THE AIR MASS
OVER OUR CWA NOT AS UNSTABLE AS IT WAS YESTERDAY. WEDNESDAY
AND THURSDAY SHOULD GRADUALLY DRY OUT AS THE GENERAL UPPER
TROUGH OVER THE INTERMOUNTAIN WEST WEAKENS FURTHER. TEMPERATURES
WILL SLOWLY MODERATE THROUGH THURSDAY WITH HIGHS ABOUT TWO
DEGREES WARMER EACH DAY WHILE LOWS HOLD STEADY IN THE UPPER
TEENS AND 20S IN THE MOUNTAINS AND MID 20S TO LOWER 30S IN THE
VALLEYS. GUSTY WEST WINDS WILL REACH 30 MPH THIS AFTERNOON IN
SOUTH-CENTRAL IDAHO, BUT ONLY 10 TO 15 MPH ELSEWHERE. LESS
WINDY WEDNESDAY AND THURSDAY.
LONG TERM...FRIDAY THROUGH TUESDAY...A LARGE RIDGE IS EXPECTED
TO CONTINUE BUILDING INTO THE NORTHWEST REGION THROUGH FRIDAY
AND THE WEEKEND, BRINGING IN DRY CONDITIONS AND INCREASINGLY
WARM DAYTIME TEMPERATURES IN THE LOWER 60S UNTIL SUNDAY.
NIGHTTIME TEMPERATURES ARE EXPECTED TO CONTINUE DROPPING INTO
THE UPPER 30S ACROSS THE AREA DURING THIS PERIOD. DAYTIME
TEMPERATURES ARE EXPECTED TO TREND TOWARD THE UPPER 60S THROUGH
MONDAY AND TUESDAY. SNOW LEVELS WILL GRADUALLY INCREASE IN THE
RANGE OF 4000-5000 FT THROUGH FRIDAY AND THE WEEKEND, BEFORE
RISING TO AROUND 6000 FT EARLY NEXT WEEK. THE RIDGE AXIS IS
EXPECTED TO MOVE OUT EAST THROUGH SUNDAY AS A LONGWAVE TROUGH
MOVES IN ON MONDAY, FAVORING MOSTLY RAIN THROUGHOUT THE AREA AS
PROJECTED SNOW LEVELS ARE GENERALLY UNFAVORABLE FOR SNOWFALL.
BOI WATCHES/WARNINGS/ADVISORIES
ID...NONE.
OR...NONE.
WWW.WEATHER.GOV/BOISE
INTERACT WITH US VIA SOCIAL MEDIA:
WWW.FACEBOOK.COM/NWSBOISE
WWW.X.COM/NWSBOISE
DISCUSSION...DG
AVIATION.....SA
SHORT TERM...LC
LONG TERM....JY
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