588
FXUS65 KGGW 100815
AFDGGW
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GLASGOW MT
215 AM MDT THU JUL 10 2025
DISCUSSION
KEY MESSAGES:
1) A FRONTAL SYSTEM WILL ARRIVE LATE THIS AFTERNOON AND GENERATE
WINDS OF 20 TO 30 MPH INTO THE EVENING. A LAKE WIND ADVISORY IS IN
EFFECT.
2) EXPECT A BRIEF COOL DOWN THURSDAY WITH HIGHS IN THE 70S. THEN
A RETURN TO 90S OVER THE WEEKEND AS A RIDGE BUILDS BACK IN.
3) A COOL DOWN WITH ISOLATED SHOWERS AND THUNDERSTORMS ON THE
FRONT IS AGAIN EXPECTED EARLY NEXT WEEK.
WEATHER PATTERN OVERVIEW:
RELATIVELY LIGHT NORTHWEST WINDS ARE EXPECT THROUGH THE MAJORITY
OF THE DAY WHEN FRONTAL SYSTEMS MOVES THROUGH AND INCREASING THE
WINDS TO 10 TO 20 GUST 30S IN THE LATE AFTERNOON AND EVENING
HOURS. SCATTERED SHOWERS AND THUNDERSTORMS ARE EXPECTED ON THIS
FRONT BUT SHOULD NOT BE SEVERE AND WILL PROBABLY CONTAIN VERY
LITTLE RAIN, AND WHAT DOES FALL THAT IS MEASURABLE WILL LIKELY BE
ACROSS THE FAR NORTH AND NORTHEAST.
RELIEF, IN THE FORM OF COOLER AIR IS EXPECTED BRIEFLY FRIDAY. HEAT
WILL RETURN UNDER ANOTHER DOME OF HIGH PRESSURE ON SATURDAY AND
SUNDAY.
THIS HEAT DOME IS EXPECTED TO EXIT WITH ANOTHER COLD FRONT
THROUGH MONDAY. WHILE CONDITIONS DO COOL OFF MID-WEEK CONFIDENCE
INT HE FORECAST FROM ABOUT TUESDAY ONWARD DOES DROP OFF RAPIDLY AS
ENSEMBLES SPLIT APART QUICKLY THERE AFTER.
FORECAST CONFIDENCE & DEVIATIONS:
DEVIATIONS INCLUDED... BLENDING IN NBM90 WINDS INTO THE FORECAST
FROM ABOUT 21Z THROUGH MIDNIGHT TODAY.
POPS THROUGH ROUGHLY 12Z THIS MORNING NEEDED A MASSIVE ADJUSTMENT
AS THEY ARE NOT FOLLOWING OBSERVATIONS OR CURRENT SHOWER TRACK
PATHS ON RADAR. LIGHT SKY GRID ADJUSTMENTS TO ACCOUNT FOR THESE
SHOWERS WERE ALSO ENFORCED.
CONFIDENCE FROM TUESDAY ONWARD IS LOW AS ENSEMBLES BEGIN
DISAGREEING AT THE SYNOPTIC SCALE HERE FORWARD ACROSS THE REGION.
AVIATION
LAST UPDATED: 0730Z
FLIGHT CAT RANGE: VFR.
DISCUSSION: ISOLATED RAIN SHOWERS ACTIVITY SHOULD EXIT THE
TERMINALS BY ABOUT 12Z THIS MORNING LEAVING A CLEAR DAY TILL
ABOUT 22-00Z WHEN A NEW WAVE OF ISOLATED RAIN SHOWERS AND THUNDER-
STORMS DROPS DOWN FROM THE NORTH THROUGH THE EVENING HOURS. THIS
ACTIVITY SHOULD EXIT THE TERMINALS AROUND 10-12Z TONIGHT.
WINDS: W TO NW AROUND 5 TO 15 KTS THROUGH THIS MORNING AND EARLY
AFTERNOON. IN THE LATE AFTERNOON A WEEK FRONT WILL INCREASE
SPEEDS TO 10 TO 20 GUST 30 KTS THROUGH THE EARLY EVENING. AROUND
06Z SPEEDS WILL REDUCE SLIGHTLY TO 5 TO 15 GUST 20 KTS.
GAH
GGW WATCHES/WARNINGS/ADVISORIES
LAKE WIND ADVISORY FROM 10 AM THIS MORNING TO 9 PM MDT THIS
EVENING FOR CENTRAL AND SOUTHEAST PHILLIPS-CENTRAL AND SOUTHERN
VALLEY-GARFIELD-MCCONE-PETROLEUM.
WEATHER.GOV/GLASGOW
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