624
FXUS65 KBOI 191957
AFDBOI
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
157 PM MDT TUE MAY 19 2026
KEY MESSAGES
- MOSTLY DRY WITH TEMPERATURES WARMING THROUGH FRIDAY.
- WELL ABOVE NORMAL TEMPERATURES OVER MEMORIAL DAY WEEKEND.
GUSTY WINDS AND A FEW MOUNTAIN SHOWERS POSSIBLE ON MEMORIAL
DAY.
- TURNING COOLER EARLY NEXT WEEK WITH GUSTY WINDS AND INCREASING
CHANCE OF PRECIPITATION STARTING TUESDAY.
SHORT TERM /THROUGH THURSDAY NIGHT/
OUR REGION WILL REMAIN POSITIONED ON THE WESTERN EDGE OF UPPER
LEVEL TROUGHING THROUGH THURSDAY. WHILE THE FOCUS OF ORGANIZED
PRECIPITATION WILL REMAIN TO OUR EAST, DAYTIME INSTABILITY WILL
SUPPORT WIDESPREAD CUMULUS BUILDUPS OVER THE MOUNTAINS AS SEEN
THIS AFTERNOON. THERE'S A SLIGHT CHANCE THAT SHOWERS COULD
DEVELOP FROM THE CUMULUS FIELD ACROSS E-CENTRAL OREGON AND
W-CENTRAL IDAHO MTNS EACH AFTERNOON. LOCALIZED GUSTY WINDS WILL
BE POSSIBLE FROM SHOWERS OR MORE ROBUST CUMULUS (WITH OR W/O
PRECIPITATION). SHOWER CHANCES BRIEFLY INCREASE TO 15-25% IN THE
W-CENTRAL IDAHO MTNS AND S-CENTRAL IDAHO ZONES WEDNESDAY NIGHT
IN RESPONSE TO A PASSING SHORTWAVE TROUGH. OTHERWISE IT'S DRY
AND TEMPERATURES ARE ON THE WAY UP, LEAVING BEHIND ANY
FROST/FREEZE CONCERNS FOR THE SNAKE PLAIN. BY THURSDAY HIGH
TEMPERATURES WILL BE SEVERAL DEGREES ABOVE NORMAL.
LONG TERM /FRIDAY THROUGH TUESDAY/
A RIDGE OF HIGH PRESSURE WILL BUILD OVER THE WESTERN US BY THE
END OF THIS WEEK, BRINGING GENERALLY CLEAR, WARM AND DRY
CONDITIONS TO THE REGION THROUGH MONDAY. TEMPERATURES WILL BE
ABOUT 10-15 DEGREES ABOVE NORMAL. THE RIDGE WILL REACH PEAK
STRENGTH ON SUNDAY, WITH HIGH TEMPERATURES NEAR 90F IN THE
TREASURE VALLEY. BY MONDAY, MODELS INDICATE THAT AN UPPER LEVEL
LOW MOVING INTO THE PACIFIC NORTHWEST WILL BEGIN TO INCREASE
CHANCES FOR PRECIPITATION. THE UPPER LEVEL TROUGH WILL MOVE
INLAND ON TUESDAY, WITH ABOUT HALF OF THE MODELS SHOWING THAT
THE TROUGH WILL EVOLVE INTO A CLOSED LOW OVER THE PACIFIC NW BY
TUESDAY OR WEDNESDAY. IN EITHER SCENARIO, TEMPERATURES WILL COOL
DOWN 10-20 DEGREES BY TUESDAY INCREASING WINDS AND CHANCE OF
SHOWERS AND THUNDERSTORMS (20-30% CHANCE).
AVIATION /18Z TUESDAY THROUGH WEDNESDAY/
ISSUED 1214 PM MDT TUE MAY 19 2026
VFR. SCATTERED HIGH BASED CUMULUS CLOUDS WILL CONTINUE OVER THE
AREA WITH SOME PRODUCING VIRGA AND GUSTY WINDS. SURFACE WINDS
GENERALLY W TO NW AT 5-15 KTS, EXCEPT IN THE VICINITY OF VIRGA
WHERE GUSTS TO 35 KTS ARE POSSIBLE THIS AFTERNOON. WINDS LIGHT
AND VARIABLE LESS THAN 10 KTS TONIGHT ACROSS THE AREA. WINDS
W-NW 10 TO 15 KTS ON WEDNESDAY.
KBOI...VFR. SURFACE WINDS NW 10 TO 15 KTS THIS AFTERNOON. WINDS
LIGHT AND VARIABLE LESS THAN 5 KTS TONIGHT. WINDS W-NW 10 TO 15
KTS ON WEDNESDAY.
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
SHORT TERM...DG
LONG TERM....JB
AVIATION...JB
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