362
FXUS65 KGGW 161103
AFDGGW
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GLASGOW MT
403 AM MST MON DEC 16 2024
DISCUSSION
KEY MESSAGES:
- SNOW IS EXPECTED TONIGHT INTO TUESDAY MAINLY OVER THE SOUTHWEST
ZONES.
- WEDNESDAY INTO WEDNESDAY NIGHT A SYSTEM WILL MOVE ACROSS THE
NORTH WITH SNOW AND POSSIBLY FREEZING RAIN.
WEATHER PATTERN OVERVIEW:
GENERALLY NORTHWEST FLOW ALOFT IS EXPECTED THROUGH MIDWEEK. A
DISTURBANCE MOVING THROUGH THE NORTHERN ROCKIES WILL SPIN UP A
WEAK LOW PRESSURE OVER WYOMING, WITH SNOW POSSIBLE ALONG THE
INVERTED TROUGH EXTENDING INTO CENTRAL MONTANA TONIGHT INTO
TUESDAY.
CANADIAN HIGH PRESSURE PUSHES SOUTH TUESDAY NIGHT WITH SOME SUB-
ZERO TEMPERATURES POSSIBLE.
A STRONGER SHORTWAVE SLIDES SOUTH ACROSS ALBERTA ON WEDNESDAY WITH
A LOW TRACKING ACROSS MONTANA AND INTO NORTH DAKOTA WEDNESDAY
NIGHT.
INTO THE END OF THE WEEK, THE WESTERN UPPER RIDGE WILL SLIDE EAST
OF THE ROCKIES BRINGING MUCH WARMER TEMPERATURES TO THE REGION
INTO THE WEEKEND.
FORECAST CONFIDENCE & DEVIATIONS:
NO NOTABLE DEVIATIONS WERE MADE TO THE BASE FORECAST. THERE
REMAINS MODERATE CONFIDENCE ON LIGHT SNOW ACCUMULATION OCCURRING
TONIGHT INTO TUESDAY. THE WEDNESDAY SYSTEM HAS LOWER CONFIDENCE
FOR AMOUNT AND TYPE OF PRECIPITATION, WITH A LARGE SPREAD OF
POTENTIAL POSITION OF THE LOW TRACK.
AVIATION
VFR TO IFR.
A DECK OF MVFR CEILINGS WITH PATCHY FOG OVER THE NORTHEAST WILL
GRADUALLY LIFT THROUGH THE MORNING. VFR CONDITIONS ARE EXPECTED
THIS AFTERNOON, WITH CLOUDS RETURNING TONIGHT AS THE NEXT SNOW
SYSTEM MOVES INTO THE REGION FROM THE SOUTHWEST.
GGW WATCHES/WARNINGS/ADVISORIES
NONE.
WEATHER.GOV/GLASGOW
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