303
FXUS65 KMSO 300905
AFDMSO
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MISSOULA MT
305 AM MDT TUE JUN 30 2026
DISCUSSION
KEY MESSAGES:
- FLOODING OF SMALL STREAMS AND CREEKS MAY STILL BE OCCURRING IN
THE MISSION VALLEY AND IN GLACIER NATIONAL PARK.
- SCATTERED SHOWERS AND THUNDERSTORMS ARE ONGOING TODAY.
- EXPECT DAILY SHOWERS AND THUNDERSTORMS FOR THE REST OF THE
WEEK.
THE WIDESPREAD MODERATE TO HEAVY RAINFALL HAS FINALLY ENDED FOR
WESTERN MONTANA AND NORTH-CENTRAL IDAHO FOR TODAY. THE LARGE LOW-
PRESSURE SYSTEM THAT BROUGHT ALL OF THE RAIN AND HIGH MOUNTAIN
SNOWFALL HAS MOVED NORTH AND EAST INTO SASKATCHEWAN, CANADA. WHILE
TOTAL PRECIPITATION WAS LESS THAN WHAT FELL DURING THE FIRST WEEK
OF JUNE, AMOUNTS WERE STILL IMPRESSIVE FOR THE NORTHERN ROCKIES.
SOME OF THE HIGHEST TOTALS FELL IN NORTHWEST MONTANA, SPECIFICALLY
IN AND AROUND GLACIER NATIONAL PARK, WHICH RECEIVED 1.50 TO 3.00
INCHES. THE LOLO NATIONAL FOREST AND ADJACENT VALLEYS RECEIVED
SIMILAR AMOUNTS RANGING FROM 1.60 TO JUST UNDER 3.50 INCHES.
MISSOULA RECEIVED 1.01 INCHES OF RAIN, BREAKING THE DAILY RAINFALL
RECORD OF 0.97 INCHES SET IN 2020. NORTH-CENTRAL IDAHO SAW HEAVY
RAIN AS WELL; THE CLEARWATER MOUNTAINS RECORDED IMPRESSIVE AMOUNTS
OF 2 TO 3 INCHES, WITH 1 TO 2 INCHES FALLING IN THE VALLEYS AROUND
KAMIAH AND KOOSKIA.
TODAY, WINDS REMAIN OUT OF THE NORTH, WRAPPING AROUND THE LARGE
LOW-PRESSURE SYSTEM IN CANADA AND TRANSPORTING MOISTURE INTO THE
NORTHERN ROCKIES. THIS MOISTURE WILL FUEL SCATTERED SHOWERS AND
THUNDERSTORMS THROUGHOUT THE DAY. WHILE THE WIDESPREAD RAINFALL
HAS ENDED, FLOODING OF SMALL STREAMS AND CREEKS MAY STILL BE
OCCURRING IN THE MISSION VALLEY AND IN GLACIER NATIONAL PARK.
BECAUSE OF THIS, THE FLOOD WARNINGS IN THOSE AREAS REMAIN IN
PLACE.
TEMPERATURES WILL BEGIN TO WARM FOR THE REST OF THE WEEK, WITH
AFTERNOON HIGHS RETURNING TO NEAR-NORMAL VALUES—REACHING THE UPPER
70S IN WESTERN MONTANA AND THE LOW TO MID-80S IN NORTH-CENTRAL
IDAHO BY THURSDAY. WITH HIGHER-THAN-NORMAL MOISTURE IN THE
ATMOSPHERE AND WARMING TEMPERATURES, EXPECT DAILY AFTERNOON
SHOWERS AND THUNDERSTORMS THROUGH THE REST OF THE WEEK. BECAUSE OF
THE ADDED MOISTURE, MORNING FOG WILL ALSO DEVELOP EACH DAY,
ESPECIALLY NEAR BODIES OF WATER.
FOR THE 4TH OF JULY ON SATURDAY, EXPECT WARM TEMPERATURES IN THE
80S AND 90S ALONGSIDE MOSTLY DRY CONDITIONS.
AVIATION
THE WIDESPREAD MODERATE TO HEAVY RAINFALL HAS FINALLY
ENDED FOR WESTERN MONTANA AND NORTH-CENTRAL IDAHO, AS THE LARGE
LOW-PRESSURE SYSTEM THAT BROUGHT ALL OF THE RAIN MOVES NORTH AND
EAST INTO SASKATCHEWAN, CANADA. RESIDUAL MOISTURE WILL REMAIN OVER
THE REGION TODAY, WHICH WILL TRIGGER SCATTERED SHOWERS AND
THUNDERSTORMS THROUGHOUT THE DAY. BRIEF, INTENSE RAINFALL RATES OF
AROUND 0.30 INCHES PER HOUR WILL BE POSSIBLE WITH THE HEAVIER
SHOWERS AND THUNDERSTORMS, MOST LIKELY BETWEEN 4 PM AND 10 PM MDT
(2200Z TO 0400Z). BRIEF, ERRATIC WIND GUSTS UP TO 25 KNOTS WILL BE
POSSIBLE AS WELL. TEMPERATURES WILL RUN 10 TO 15 DEGREES WARMER
THAN THE PAST COUPLE OF DAYS.
MSO WATCHES/WARNINGS/ADVISORIES
MT...FLOOD WATCH UNTIL 6 AM MDT EARLY THIS MORNING FOR
FLATHEAD/MISSION VALLEYS...WEST GLACIER REGION.
ID...NONE.
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