Forecast Discussions mentioning any of "ACARS" "MDCRS" "AIRCRAFT" "TAMDAR" "AMDAR" "WVSS" received at GSD on 02/18/19

Area Forecast Discussion

National Weather Service Glasgow MT

 718 PM MST Sun Feb 17 2019

.DISCUSSION...

700PM UPDATE:
Changes to the forecast first focused on the temperatures across
the region which where a bit warmer than anticipated over the next
few hours. These were dropped a few a degrees to level out the
diurnal curve over the next three hours as cloud coverage should
stay overcast and minimize any change through the evening. Cloud
bases were also raised across the board as multiple models are
very bias to the low side in IFR conditions for the last couple
days, even when VFR conditions above 3Kft have been rather regular
in observations. Aside from that most of the forecast has stayed
put and is in excellent shape. GAH


PREVIOUS SHORT TERM DISCUSSION:
Winter storm over NE Montana is now entering the dissipating
phase. Visibility has improved, ceilings have risen, and snowfall
intensities on radar have weakened. Felt it was best to cancel the
Winter Storm Warning/Winter Weather Advisory now and mention that
any additional snow accumulation will be light. Chose issue a new
Wind Chill Advisory for this evening/tonight. Expecting values
between 20 below and 35 below. Winds might be light, but impacts
will still be there.

Excellent model agreement shows that the last of the snowfall will
linger and diminish to flurries over our central and eastern
zones by Monday morning.

Clearing skies on Monday night will allow for overnight low
temperatures to drop down again to 15 below to 20 below. Wind
Chill concerns will obviously need to be addressed again.

No additional snow is expected until another low pressure trough
pushes through with some light snow showers on Thursday.

Daily high temperatures toward the latter part of the week are
beginning to show a slight improvement into the teens above zero.

BMickelson


&&

.AVIATION...

FLIGHT CAT: MVFR - VFR.

DISCUSSION: The last band of light snow from Jordan to Glasgow to
Opheim is finally beginning to dissipate as of 02Z. Conditions
should quickly improve to at least MVFR at KGGW before midnight
while they are already at VFR for the other terminals.

COLD: Temperatures below zero will likely last from 06Z to 19Z
and could cause equipment problems for light aircraft and
terminal operations.

WIND: North to northwest at 10 kts or less through Monday
morning. Becoming light and variable Monday afternoon.

GAH


&&

.GLASGOW WATCHES/WARNINGS/ADVISORIES...
Wind Chill Advisory from 11 PM this evening to 11 AM MST Monday
for Central and Southern Valley...Garfield...Northern Valley.

Wind Chill Advisory until 11 AM MST Monday for Central and
Southeast Phillips...Northern Phillips...Petroleum...Southwest
Phillips.


&&

$$

weather.gov/glasgow