995
FXUS65 KGGW 201855
AFDGGW
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GLASGOW MT
1255 PM MDT SUN SEP 20 2026
KEY MESSAGES
- PRECIPITATION IS EXPECTED TO END THIS EVENING, AND THE LOW
PRESSURE SYSTEM WILL SLOWLY MOVE EAST BY TOMORROW AFTERNOON.
- ABOVE AVERAGE TEMPERATURES BEGINNING TUESDAY AS UPPER RIDGING
BUILDS IN. A LOW PRESSURE SYSTEM IS EXPECTED TO MOVE IN BY THE
WEEKEND.
DISCUSSION
A LOW PRESSURE SYSTEM OVER EASTERN WYOMING WILL CONTINUE TO
MAINTAIN RAIN SHOWERS THROUGH ABOUT 9 PM TONIGHT, AND LOW CLOUD
COVER FROM NOW THROUGH TOMORROW MORNING IS EXPECTED TO REMAIN IN
PLACE. THIS SYSTEM WILL EVENTUALLY MOVE FAR ENOUGH EAST FOR CLOUD
COVER TO BEGIN BREAKING UP TOMORROW AFTERNOON. A RIDGE IS EXPECTED
TO BUILD IN FROM TUESDAY THROUGH FRIDAY TO BRING TEMPERATURES UP
TO AVERAGE AND SLIGHTLY ABOVE AVERAGE. A SHORTWAVE TROUGH WILL
MOVE THROUGH ON WEDNESDAY TO MOSTLY AFFECT THE SOUTHEAST PART OF
THE AREA AND BRING RAIN SHOWERS. THERE IS SOME UNCERTAINTY ON THE
TIMING OF THE NEXT UPPER TROUGH, BUT IT APPEARS MORE LIKELY FOR
THIS TO OCCUR ON SATURDAY AND SUNDAY.
FORECAST CONFIDENCE & DEVIATIONS:
THE NBM TYPICALLY LIKES TO REDUCE POPS QUICKLY ON THE BACKSIDE OF
SLOW MOVING SYSTEMS, SO DECIDED TO MANUALLY ADD POPS THROUGH 9 PM
TONIGHT IN THE SOUTHEAST. INCREASED WINDS THROUGH TOMORROW
AFTERNOON FOR THE HIGHER ELEVATION LOCATIONS ACROSS THE AREA
(ABOVE 2500 FEET).
THERE IS HIGH CONFIDENCE IN RAIN SHOWERS ENDING LATE THIS
EVENING, AND A RIDGE BUILDING IN BY TUESDAY.
THERE IS HIGH CONFIDENCE ON A SHORTWAVE TROUGH MOVING THROUGH ON
WEDNESDAY IN THE SOUTHEAST, BUT THERE IS LOW CONFIDENCE ON
PRECIPITATION AMOUNTS.
THERE IS MODERATE CONFIDENCE ON A LOW PRESSURE SYSTEM MOVING IN BY
FRIDAY NIGHT.
AVIATION
LAST UPDATED: 1830Z
FLIGHT CAT RANGE: A MIX OF MVFR, IFR, AND LIFR THROUGH 18Z MONDAY,
AND THEN MOSTLY MVFR.
DISCUSSION: THE SURFACE LOW PRESSURE SYSTEM WILL CONTINUE TO
INFLUENCE THE AREA. PRECIPITATION WILL SLOWLY COME TO AN END, AND
THERE IS MODERATE TO HIGH CONFIDENCE THIS PRECIPITATION WILL END
BY 03Z. HOWEVER, LOW CEILINGS WILL PERSIST. THERE IS MODERATE TO
HIGH (50 TO 70 PERCENT) CONFIDENCE OF SCATTERED IFR AND LIFR
CEILINGS OCCURRING THROUGH 18Z. THERE IS SIMILAR CONFIDENCE THAT
THESE CONDITIONS WILL IMPROVE TO MVFR AFTER 18Z.
WIND: EAST SOUTHEAST AT 6 TO 15 KTS WITH GUSTS TO 22 KTS,
BECOMING SOUTHEAST AFTER 18Z MONDAY.
GGW WATCHES/WARNINGS/ADVISORIES
NONE.
WEATHER.GOV/GLASGOW
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