696
FXUS65 KBOI 182326
AFDBOI
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
526 PM MDT SAT APR 18 2026
UPDATE
UPDATED AVIATION DISCUSSION.
KEY MESSAGES
- DRY AND WARM THROUGH TUESDAY.
- SHOWERS AND THUNDERSTORMS AND TURNING COOLER WEDNESDAY AS A
COLD FRONT MOVES INLAND.
SHORT TERM /THROUGH MONDAY NIGHT/
ISSUED 252 PM MDT SAT APR 18 2026
A RIDGE OF HIGH PRESSURE WILL CONTINUE TO BUILD INTO THE AREA
OVER THE NEXT SEVERAL DAYS WITH A WARMING TREND THROUGH MONDAY.
TEMPERATURES WILL WARM AN ADDITIONAL 10 DEGREES ON SUNDAY AND
AROUND 5 DEGREES ON MONDAY. AS THE RIDGE STRENGTHENS, THE
SURFACE WINDS SHIFT TO SOUTH-SOUTHEAST AIDING IN THE WARMING AS
WELL WITH BREEZY CONDITIONS DURING THE AFTERNOONS THROUGH
MONDAY.
LONG TERM /TUESDAY THROUGH SATURDAY/
ISSUED 252 PM MDT SAT APR 18 2026
TUESDAY WILL CONTINUE THE TREND OF WELL-ABOVE AVERAGE
TEMPERATURES ACROSS THE REGION, WITH THE UPPER-LEVEL RIDGE
OVER THE ROCKIES AND A CUTOFF LOW MOVING INTO THE WESTERN U.S.
COAST. WITH THIS SHARP PRESSURE GRADIENT OVER THE REGION, BREEZY
SOUTHERLY WINDS ARE FORECAST TUESDAY AFTERNOON. BEGINNING
TUESDAY EVENING INTO WEDNESDAY, THIS COLD-CORE PACIFIC LOW WILL
BRING COLD AIR (BEHIND A WEST-TO-EAST COLD FRONT), WIDESPREAD
SHOWERS, AND A SLIGHT CHANCE OF THUNDERSTORMS. WEDNESDAY WILL
BECOME THE WETTEST DAY, WITH THE PROBABILITY OF PRECIP CLIMBING
TO 60-90% FOR THE MORNING AND AFTERNOON. SNOW LEVELS WILL ALSO
LOWER TO 5000-6500 FT MSL AT THAT TIME AS THE LOW CENTER MOVES
OVERHEAD, ALLOWING SNOW ACCUMULATION OVER THE HIGHER TERRAIN.
MAXIMUM DAILY TEMPERATURES ARE FORECAST TO DROP AS MUCH AS 20-30
DEGREES FROM TUESDAY TO WEDNESDAY. SHOWERS AND BELOW NORMAL
TEMPERATURES WILL PERSIST INTO THURSDAY AS THE UPPER LOW BECOMES
INGESTED INTO THE PARENT CANADIAN TROUGH TO THE NORTH. THIS
WILL SOLIDIFY COOL AND UNSETTLED NORTHERLY FLOW ACROSS THE N
ROCKIES AS THE LOW PROGRESSES EAST, WITH LINGERING MOUNTAIN
SHOWERS EXPECTED INTO FRI. WINDS WILL BE GUSTY WEDNESDAY AND
BREEZY ON THURSDAY BEHIND THE COLD FRONT AND AS THE TROUGH MOVES
EAST.
THE UPPER-LEVEL PATTERN BECOMES QUITE DISORGANIZED AND VARIABLE
ACROSS THE LONG RANGE MODELS FRIDAY ONWARDS. WHAT CAN BE SAID AT
THIS TIME IS THAT THE CLUSTERS AGREE ON BELOW-NORMAL UPPER-LEVEL
HEIGHTS, INDICATING AN ACTIVE PATTERN REMAINING.
AVIATION /00Z SUNDAY THROUGH MONDAY/
ISSUED 524 PM MDT SAT APR 18 2026
VFR UNDER HIGH CLOUDS. SURFACE WINDS: E-SE 5-15 KT. GUSTS TO 20
KT IN THE LOWER SNAKE PLAIN THROUGH KBKE. WINDS BECOME LIGHTER
AND MORE VARIABLE OVERNIGHT. WINDS ALOFT AT 10KFT MSL: S-SW
5-15 KT.
KBOI...VFR. SURFACE WINDS: SE 6-12 KT. GUSTS AROUND 20 KT
THROUGH THE EVENING.
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.....JM
SHORT TERM...KA
LONG TERM....CH
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