Area Forecast Discussion
Issued by NWS Glasgow, MT

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FXUS65 KGGW 192058

Area Forecast Discussion
National Weather Service Glasgow MT
258 PM MDT Mon Oct 19 2020


Tricky forecast today. Earlier observations from Lewistown
southeast toward Miles City and Billings indicated that mixed
precipitation was in fact falling at those locations, including
freezing rain and sleet.

For tonight through early Tuesday morning, forecast soundings
favor more freezing rain than sleet, but internal programs and
HREF guidance from SPC suggests sleet will be prominent as
temperatures drop and the warm nose of air aloft remains over the

The Winter Weather Advisory should cover this well, but felt it
was best to add our Prairie County for this wintry mix as well,
mainly after midnight.

The wintry mix will gradually diminish away toward the east on

The next winter storm is taking shape for the region at large
Wednesday through Thursday. Confidence for timing and placement
and amounts is still less than average at this time, but soon we
will be able to increase that confidence for 6 to 8 inches of
snow, especially near and south of US-Highway 2.

Arctic cold temperatures will descend over the region late this
week and into next week. Near record cold temperatures for these
days will be possible.



FLIGHT CATEGORY: VFR to MVFR through early evening, with IFR
expected by late evening mainly due to lowered ceilings.

WINDS: E-SE 5-15 kts by this afternoon into this evening,
becoming variable 5-15 kts overnight tonight. NW winds 10-20 kts
with occasional higher gusts expected Tuesday.

SYNOPSIS: Periods of snow and/or a wintry will impact the TAF
sites through this tonight before tapering off late tonight or
Tuesday morning. Some wintry precipitation cannot be ruled out
Tuesday morning at KSDY and KGDV before ending by Tuesday


Winter Weather Advisory until 5 AM MDT Tuesday for Garfield...
Petroleum...Prairie...Southwest Phillips.


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