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Area forecast discussion
National Weather Service Glasgow Montana
724 PM MST Thu Nov 14 2019

Discussion...
evening update...
main change was to add Daniels and Sheridan counties to the dense
fog advisory. The dot camera at Comertown shows that they are
socked in with fog. Other areas to watch this evening and tonight
will be the Musselshell valley along the Garfield/Petroleum County
line, with model guidance suggesting a reduction in visibilities
there as well.

Otherwise, only cosmetic changes were involved.

Avery

Previous discussion...
the main story for the forecast is the potential for fog for the
next couple of nights in areas where snow is still present to
melt, as the high pressure regime with light winds and strong
radiative cooling will allow for development of dense fog. As
such, a dense fog advisory was already deemed necessary for
tonight into Friday morning.

Beyond Friday, a couple of weak disturbances will bring slight
chances of very light precipitation Saturday and then
Tuesday/Wednesday. Neither system is expected to bring many
impacts to the region. High pressure does look to return at some
point next week, even though a bit of a cooling period is expected
behind the front system on Tuesday and Wednesday. Expect
temperatures generally to remain around or above freezing through
the period, allowing for much if not all of the snowpack for much
of northeast Montana to melt off.

Bigelbach



&&

Aviation...
flight category: VFR-vlifr

Fog: dense fog expected again through Friday morning over the taf
sites and in the river valleys as the meteorological situation
is similar to yesterday. Light winds, melting snow and clear
skies will lead to quick cooling after sunset and quick onset of
fog. This will bring visibility down to 1/4sm for many locations
for much of the time with vertical velocity up to a couple hundred feet.

During periods without fog, expect mostly VFR to MVFR conditions
over the next few days.

Winds: light and variable winds expected through Friday.

Avery



&&

Glasgow watches/warnings/advisories...
dense fog advisory until 11 am MST Friday for central and
southeast Phillips...central and southern valley...Daniels...
Dawson...eastern Roosevelt...northern Phillips...northern
Valley...Prairie...Richland...Sheridan...western Roosevelt...
Wibaux.

&&

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