303
FXUS65 KBOI 280511
AFDBOI
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
1111 PM MDT MON APR 27 2026
UPDATE
UPDATED AVIATION DISCUSSION.
KEY MESSAGES
- AFTERNOON RAIN AND SNOW SHOWERS OVER HIGHER TERRAIN THROUGH
WEDNESDAY.
- GRADUAL WARMING TREND THROUGH THE WEEK.
- THUNDERSTORMS POSSIBLE THIS WEEKEND.
SHORT TERM /THROUGH WEDNESDAY NIGHT/
ISSUED 252 PM MDT MON APR 27 2026
A COOL UPPER LEVEL TROUGH REMAINS OVER THE AREA KEEPING
UNSETTLED CONDITIONS DURING THE AFTERNOONS THROUGH THE SHORT TERM.
SHOWERS AND A SLIGHT CHANCE OF THUNDERSTORMS OVER THE MOUNTAINS EACH
AFTERNOON THROUGH WEDNESDAY. TEMPERATURES WILL SLOWLY MODERATE EACH
DAY AS A WARMING TREND ENSUES.
LONG TERM /THURSDAY THROUGH MONDAY/
ISSUED 252 PM MDT MON APR 27 2026
A SW-NE ORIENTED UPPER-LEVEL RIDGE AXIS WILL MOVE OVER THE AREA
THURSDAY AND FRIDAY, BRINGING DRY CONDITIONS, WARM TEMPERATURES,
AND LIGHT WIND SPEEDS. TEMPERATURES BEGIN THE PERIOD THURSDAY
BY INCREASING TO AROUND 5 DEGREES ABOVE NORMAL. ON FRIDAY,
TEMPERATURES RISE FURTHER BY ANOTHER 3-5 DEGREES (TOTALING 10
DEGREES ABOVE NORMAL), WITH SIMILAR TEMPERATURES EXPECTED OVER
THE WEEKEND. THIS TRANSLATES TO LOWER VALLEY HIGHS IN THE UPPER
70S TO LOWER 80S BY THE WEEKEND. ON SATURDAY, ENSEMBLE GUIDANCE
INDICATES THAT AN UPPER-LEVEL CUT-OFF LOW WILL DIVE SOUTH ALONG
OR NEAR THE PACIFIC COAST. MODEL SOLUTIONS VARY WILDLY ON
LOCATION, TRACK TIMING, AND PRECIPITATION INTENSITY. A MORE
INLAND TRACK OVER CALIFORNIA AND THE GREAT BASIN WOULD BRING
SHOWERS AND THUNDERSTORMS TO OUR AREA, BUT MODELS ALSO INDICATE
THE POTENTIAL FOR THE LOW TO REMAIN OFFSHORE, WHICH WOULD KEEP
OUR AREA WARMER AND DRIER. THE NET RESULT IN THE UNCERTAINTY IS
A 10-30% CHANCE OF SHOWERS AND A 5-10% CHANCE OF THUNDERSTORMS
ON SATURDAY. PROBABILITIES INCREASE TO A 20-50% CHANCE OF
SHOWERS AND A 10-15% CHANCE OF THUNDERSTORMS SUNDAY AND MONDAY,
HIGHEST IN THE MOUNTAINS AND NEAR THE NEVADA BORDER. THE
FORECAST CALLS FOR ABOVE NORMAL TEMPERATURES THROUGH MONDAY, BUT
WOULD TREND COOLER IF THE WETTER PATTERN BECOMES MORE LIKELY.
AVIATION /06Z TUESDAY THROUGH WEDNESDAY/
ISSUED 1111 PM MDT MON APR 27 2026
VFR WITH SCATTERED MID-HIGH CLOUDS. SNOW LEVELS 4500-5500 FT MSL.
SCATTERED MOUNTAIN SHOWERS RETURNING TUESDAY AFTERNOON THROUGH
EVENING. SURFACE WINDS: MOSTLY VARIABLE UNDER 10 KT AND SW 10-15 KT
IN MAGIC VALLEY OVERNIGHT THROUGH MORNING. BREEZY NW WINDS 8-15 KT
RETURNING IN THE AFTERNOON, WITH GUSTS 20-25 KT EAST OF KBOI. WINDS
ALOFT AT 10KFT MSL: NW 10-20 KT.
KBOI...VFR. SURFACE WINDS: VARIABLE UNDER 7 KT OVERNIGHT THROUGH
MORNING, BECOMING NW 7-12 KT IN THE AFTERNOON.
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
AVIATION.....JY
SHORT TERM...KA
LONG TERM....CH
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