936
FXUS65 KGGW 172039
AFDGGW
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GLASGOW MT
139 PM MST MON FEB 17 2020
DISCUSSION
AN ARCTIC AIRMASS WILL ARRIVE THIS EVENING AS A COLD FRONT DIVES
SOUTH THROUGH THE AREA. WINDS WILL FLIP AROUND TO THE NORTH BEHIND
THE FRONT AT 10 TO 20 MPH, BUT THE STRONGER WINDS WILL DIE DOWN BY
LATE TONIGHT. AN AREA OF SNOW SHOWERS WILL ALSO ACCOMPANY THE
FRONT WITH UP TO A QUICK INCH OR SO OF SNOW POSSIBLE THIS EVENING
INTO TONIGHT.
TEMPERATURES WILL BE AROUND 10 BELOW BY MORNING FOR NORTHERN
LOCATIONS WITH SINGLE DIGITS ABOVE ZERO EXPECTED SOUTH. A WIND
CHILL ADVISORY IS IN EFFECT FOR NORTHERN VALLEY, DANIELS, AND
SHERIDAN COUNTIES TONIGHT INTO TUESDAY MORNING FOR WIND CHILLS AS
COLD AS 30 BELOW ZERO.
AS THE ARCTIC HIGH FOLLOWS THE COLD FRONT, CHANCES OF SNOW SHIFT
TO THE UPSLOPE AREAS OF THE SOUTHWEST ZONES FOR TUESDAY MORNING.
COLD AIR LINGERS OVER EASTERN MONTANA AS THE HIGH MOVES THROUGH
THE NORTHERN PLAINS EARLY THIS WEEK. THIS ARCTIC AIR WILL BEGIN
TO DISSIPATE BY WEDNESDAY WITH THE SURFACE HIGH MOVING INTO THE
UPPER MIDWEST. AN UPPER RIDGE ALSO BEGINS TO BUILD INTO THE
PACIFIC NORTHWEST DURING THIS TIME.
WARM AIR WILL THEN CONTINUE TO SPREAD EAST WITH THE UPPER RIDGE
THROUGH NEXT WEEKEND.
-MOTTICE
AVIATION
FLIGHT CAT: GENERALLY VFR, BUT MVFR AND IFR CONDITIONS ARE
EXPECTED THIS EVENING INTO EARLY TONIGHT AS A BAND OF SNOW MOVES
ACROSS ALL TAF SITES.
WIND: WINDS BECOME NORTH AT 10 TO 15 KNOTS BEHIND A COLD FRONT
THIS EVENING. WINDS DIE DOWN TO LESS THAN 10 KNOTS BY TUESDAY
MORNING.
DISCUSSION: A COLD FRONT WILL USHER IN MUCH COLDER AIR AND SNOW
SHOWERS THIS EVENING INTO TONIGHT. UP TO A QUICK INCH OF SNOW IS
POSSIBLE. TEMPERATURES WILL DROP NEAR OR BELOW ZERO AT ALL TAF
LOCATIONS TUESDAY MORNING.
-MOTTICE
GLASGOW WATCHES/WARNINGS/ADVISORIES
WIND CHILL ADVISORY FROM 2 AM TO 11 AM MST TUESDAY FOR DANIELS...
NORTHERN VALLEY...SHERIDAN.
WEATHER.GOV/GLASGOW
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