740
FXUS65 KBOI 200645
AFDBOI
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
1245 AM MDT SAT JUN 20 2026
UPDATE
UPDATED AVIATION DISCUSSION.
KEY MESSAGES
- SCATTERED SHOWERS AND THUNDERSTORMS LATE TODAY THROUGH
SATURDAY.
- DAYTIME TEMPERATURES COOLING TO NORMAL SATURDAY AND SUNDAY,
THEN HOTTER AND DRIER MONDAY THROUGH WEDNESDAY.
SHORT TERM /THROUGH MONDAY NIGHT/
ISSUED 221 PM MDT FRI JUN 19 2026
AS OF 2 PM MDT THUNDERSTORMS WERE ALREADY DEVELOPING ALONG THE NV/OR
BORDER AND MOVING NORTH. AN UPPER TROUGH IN NORTHERN CALIFORNIA
TONIGHT WILL MOVE SLOWLY ENE-WARD ACROSS THE NORTHERN GREAT BASIN
SATURDAY AND INTO EASTERN ID AND SOUTHWEST MT SUNDAY. SHOWER AND
THUNDERSTORM COVERAGE WILL INCREASE IN SOUTHEAST OREGON THROUGH THIS
EVENING, AND IN SOUTHWEST IDAHO LATER TONIGHT, CONTINUING IN BOTH
AREAS SATURDAY. STRONGER STORMS WILL PRODUCE GUSTY OUTFLOW WINDS,
ESPECIALLY IN SOUTHEAST OR LATE TODAY AND THIS EVENING. STORMS
SHOULD WEAKEN DURING THE OVERNIGHT HOURS BUT BECOME STRONGER AGAIN
LATER SATURDAY. LOW TEMPERATURES TONIGHT WILL BE WARMER THAN NORMAL,
BUT HIGHS SATURDAY AND SUNDAY WILL BE COOLER THAN TODAY, AND CLOSE
TO NORMAL FOR MID-LATE JUNE. LOWS SATURDAY NIGHT WILL BE ABOUT TEN
DEGREES COOLER THAN TONIGHT BUT STILL SLIGHTLY ABOVE NORMAL. LOWS
SUNDAY NIGHT SHOULD BE ANOTHER 5-10 DEGREES COOLER WITH CLEARER
SKIES AND DRIER AIR IN PLACE.
LONG TERM /TUESDAY THROUGH SATURDAY/
ISSUED 221 PM MDT FRI JUN 19 2026
A RIDGE OF HIGH PRESSURE WILL BUILD OVER THE WEST COAST BEGINNING
MONDAY, BRINGING A WARMING AND DRYING TREND TO THE REGION THROUGH
THE MIDDLE OF THE WEEK. VALLEY HIGH TEMPERATURES WILL REACH THE
UPPER 90S TO LOW TRIPLE DIGITS BY WEDNESDAY. A SHORTWAVE TROUGH
WILL THEN MOVE INTO THE REGION LATE WEDNESDAY INTO THURSDAY.
THIS WILL BRING SLIGHT COOLING, BREEZY VALLEY WINDS, AND A LOW
CHANCE OF SHOWERS AND THUNDERSTORMS OVER HIGH TERRAIN ON
THURSDAY/FRIDAY. MODEL VARIANCE REMAINS HIGH ON THE STRENGTH OF
THE TROUGH AND THE EXTENT OF MOISTURE, BUT THE BEST AGREEMENT
EXISTS FOR PRECIPITATION TO STAY OVER EASTERN IDAHO. LONG RANGE
MODELS HINT AT A STRONGER CLOSED LOW TO MOVE INTO THE PACIFIC
NORTHWEST BY LATE FRIDAY, WHICH WOULD BRING MUCH COOLER
TEMPERATURES AND PRECIPITATION FOR THE END OF THE WEEK.
AVIATION /06Z SATURDAY THROUGH SUNDAY/
ISSUED 1200 AM MDT SAT JUN 20 2026 GENERALLY VFR.
SCATTERED/NUMEROUS RAIN SHOWERS AND ISOLATED THUNDERSTORMS
OVERNIGHT THROUGH SAT AFTERNOON. LOCALIZED MVFR IN RAIN, AND
MTNS OBSCURED IN PRECIP. ACTIVITY CAPABLE OF ERRATIC OUTFLOWS TO
25-45 KT, BRIEF HEAVY RAIN, SMALL HAIL, BLOWING DUST. SURFACE
WINDS OUTSIDE OF STORMS: VARIABLE 10 KT OR LESS, THEN W-NW 5- 15
KT WITH GUSTS TO 20-25 KT SAT PM. WINDS ALOFT AT 10KFT: W-NW
5-20 KT.
KBOI...VFR. VIRGA, WITH 10% CHANCE OF LIGHT RAIN OVERNIGHT. THEN,
RAIN SHOWERS LIKELY BETWEEN SAT/11Z-20Z. SURFACE WINDS: VARIABLE
LESS THAN 10 KT OVERNIGHT, THEN NW 5-10 KT AFTER SAT/12Z. POTENTIAL
FOR ERRATIC OUTFLOW WIND GUSTS TO 25-35 KT FROM SHOWERS, MAINLY
BETWEEN SAT/06Z-09Z.
SUNDAY OUTLOOK...VFR AND CLEARING SKIES SATURDAY NIGHT AND SUNDAY,
WITH BREEZY NW-W WINDS THROUGH THE SNAKE PLAIN SUNDAY AFTERNOON.
BOI WATCHES/WARNINGS/ADVISORIES
ID...RED FLAG WARNING UNTIL 6 PM MDT THIS EVENING FOR IDZ423-426.
OR...RED FLAG WARNING UNTIL 5 PM PDT SATURDAY FOR ORZ670-672.
WWW.WEATHER.GOV/BOISE
INTERACT WITH US VIA SOCIAL MEDIA:
WWW.FACEBOOK.COM/NWSBOISE
WWW.X.COM/NWSBOISE
AVIATION.....SH
SHORT TERM...LC
LONG TERM....SA
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