Forecast Discussions mentioning any of "ACARS" "MDCRS" "AIRCRAFT" "TAMDAR" "AMDAR" "WVSS" received at GSD on 02/25/19

PREVIOUS FORECAST DISCUSSION:

A Wind Chill Advisory remains in effect for the majority of

 Northeast Montana through Monday morning. Areas along the Canadian
border have been upgraded to a Wind Chill Warning for wind chills
as cold as 45 degrees below zero Monday morning.

Snow will spread across Petroleum County this evening and continue
through tonight. Look for a general 2 to 5 inches of snow, highest
accumulations across the southern portion of the county. Southern
Garfield County will also see a bit in the way of snow accumulation
tonight, but only a small portion of the county will be affected.
The snow will taper off Monday morning but there will still be
flurries or light snow showers around. As we head into Monday
evening, a more widespread accumulating snow is expected. This
will begin across Garfield and Petroleum Counties and spread north
and eastward Monday night into Tuesday.

This will bring an additional 5 to 8 inches of snow to Petroleum
County, where a Winter Storm Warning is in effect from this
evening through Tuesday morning. Snowfall amounts of around 6
inches may also fall across southern Phillips County and much of
Garfield County, thus a Winter Storm Watch has been issued for
these areas. Will pass off to future shifts to either convert this
watch into an advisory or warning. Additionally, advisory level
snow on the order of 2 to 5 inches is expected across much of the
rest of Northeast Montana by Tuesday afternoon.

We will be on the periphery of a short wave ridge as the snow ends
Tuesday into the middle part of the week. This will temporarily
dry things out with continued well below normal temperatures. Yet
another shot of Arctic air moves in towards the end of the week
with additional accumulating snow possible across much of
Northeast Montana.

-Mottice


&&

.AVIATION...
FLIGHT CAT: VFR - MVFR

DISCUSSION: VFR through most of the TAF Cycle. MVFR possible at
the end due to lowered ceilings on the incoming snow storm.

STORM SYSTEM: Near the end of the cycle a storm is developing
with accumulating snow to the southwest. This will move in Monday
evening into Tuesday. Snow will approach KGDV Monday evening and
expand to the other terminals overnight, so expect rapidly
deteriorating conditions down to IFR once the snow arrives Tuesday
morning.

COLD: After the drop off at sunset this evening, highs will not
rise above zero until after Tuesday or Wednesday. This will cause
problems for light aircraft and terminal equipment.

WIND: Northeast at 10 knots or less through tonight. Turning
easterly Monday afternoon.

-Mottice/GAH


&&

.GLASGOW WATCHES/WARNINGS/ADVISORIES...
Winter Storm Watch from Monday morning through Tuesday afternoon
for Central and Southeast Phillips...Garfield...Southwest
Phillips.

Winter Storm Warning until 11 AM MST Tuesday for Petroleum.

Wind Chill Advisory until 11 AM MST Monday for Central and
Southeast Phillips...Central and Southern Valley...Dawson...
Eastern Roosevelt...Garfield...McCone...Prairie...Richland...
Southwest Phillips...Western Roosevelt...Wibaux.

Wind Chill Warning until 11 AM MST Monday for Daniels...Northern
Phillips...Northern Valley...Sheridan.

Wind Chill Advisory until 11 PM MST this evening for Daniels...
Northern Phillips...Northern Valley...Sheridan.

&&

$$

weather.gov/glasgow