908
FXUS65 KBOI 230251
AFDBOI
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
ISSUED BY NATIONAL WEATHER SERVICE POCATELLO ID
851 PM MDT TUE APR 22 2025
DISCUSSION
AN UPPER TROUGH WILL APPROACH THE AREA THROUGH
WEDNESDAY. MOISTURE AHEAD OF THE TROUGH WILL RESULT IN SOME
CLOUDS AND ENOUGH MOISTURE FOR A 15-30 PERCENT CHANCE OF
SHOWERS ALONG THE NEVADA BORDER AND CENTRAL IDAHO LATE TONIGHT
THROUGH WEDNESDAY. TEMPERATURES WARM SLIGHTLY WITH HIGHS A FEW
DEGREES ABOVE NORMAL. NO UPDATES.
AVIATION
VFR WITH SCT-BKN MID AND HIGH CLOUDS. ISOLATED
SHOWERS ACROSS SOUTHERN AREAS LATE TONIGHT INTO WEDNESDAY, AND
INTO CENTRAL IDAHO WEDNESDAY AFTERNOON. SURFACE WINDS: MAINLY
NW-NE 5-15 KT. WINDS ALOFT AT 10KFT: VARIABLE 5-15 KT.
KBOI...VFR. SURFACE WINDS W-NW 5-10 KT.
PREV DISCUSSION
SHORT TERM...TONIGHT THROUGH THURSDAY NIGHT...MOSTLY CLEAR
SKIES UNDER ZONAL FLOW ALOFT INTO WEDNESDAY. THE UPPER LEVEL
FLOW BEGINS TO BACK WEDNESDAY AFTERNOON IN RESPONSE TO AN
APPROACHING CUT-OFF LOW PRESSURE SYSTEM DEVELOPING OFF THE
COAST OF NORTHERN CALIFORNIA. THIS SHOULD INCREASE THE MOISTURE
ALONG WITH TEMPERATURES WEDNESDAY AFTERNOON ACROSS THE AREA FOR
A SLIGHT CHANCE OF SHOWERS OVER THE HIGHER TERRAIN ALONG THE
NEVADA BORDER. THE THREAT FOR SHOWERS EXPANDS NORTH AND EAST ON
THURSDAY INTO THE WEST CENTRAL AND BOISE MOUNTAINS AS WELL AS
THE WESTERN MAGIC VALLEY. INSTABILITY IS RATHER WEAK WITH MOST
GUIDANCE SHOWING LESS THAN 8% CHANCE FOR THUNDERSTORMS.
TEMPERATURES IN THE TREASURE VALLEY WILL CONTINUE WARMING TREND
REACHING THE LOW 70S THURSDAY AFTERNOON.
LONG TERM...FRIDAY THROUGH TUESDAY...AN UPPER LOW WILL AFFECT OUR
AREA THROUGH MUCH OF THE EXTENDED. THE CENTER OF THE LOW IS EXPECTED
TO MOVE INTO NORTHERN CALIFORNIA ON FRIDAY, THEN SLOWLY PROGRESS
EAST ACROSS THE GREAT BASIN OVER THE WEEKEND. PRECIPITATION CHANCES
WILL INCREASE TO 30-60% IN THE MOIST SOUTHERLY FLOW AHEAD OF THE LOW
ON FRIDAY (PRECIPITABLE WATER VALUES RISING TO 125-150% OF NORMAL),
AND WILL REMAIN ELEVATED THROUGH THE WEEKEND AS THE LOW REMAINS
SOUTH OF US BUT MOISTURE CONTINUES TO WRAP AROUND THE LOW.
ADDITIONALLY, THERE WILL BE ENOUGH INSTABILITY FOR A 10-20% CHANCE
OF THUNDERSTORMS EACH AFTERNOON. TEMPERATURES WILL COOL FROM AROUND
5 DEGREES ABOVE NORMAL ON FRIDAY TO A FEW DEGREES BELOW NORMAL BY
SUNDAY, ALTHOUGH UNCERTAINTY IN THE TRACK OF THE LOW RESULTS IN
LOWER CONFIDENCE IN THE TEMPERATURE FORECAST. COOLER TEMPERATURES
WILL BE ACCOMPANIED BY FALLING SNOW LEVELS, WITH MODERATE MOUNTAIN
SNOW ACCUMULATIONS POSSIBLE ABOVE 6-7KFT OVER THE WEEKEND, AND LIGHT
SNOW POSSIBLE DOWN TO 5-6KFT. BY MONDAY, THE LOW WILL BE MOVING EAST
AS AN UPPER LEVEL RIDGE BUILDS ALONG THE WEST COAST. THIS WILL START
A GRADUAL WARMING AND DRYING TREND THAT WILL CONTINUE INTO TUESDAY.
WINDS WILL BE BREEZY FROM THE WEST TO NORTHWEST ON SUNDAY AND MONDAY
AS THE LOW DEPARTS.
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...BW
AVIATION.....BW
SHORT TERM...JDS
LONG TERM....ST
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