Scientific Forecaster Discussion
Area forecast discussion
National Weather Service Cheyenne Wyoming
1031 PM MST sun Dec 8 2013
Short term...(this evening through Tuesday night)
issued at 240 PM MST sun Dec 8 2013
Clouds have clear out behind the shortwave which moved out of
Colorado and into plains. Next batch of clouds is now moving into
western portions of the County Warning Area as another wave digs south out of the
northern rockies. The next shot of Arctic air will accompany this
the wave. After warming into the single digits over much of the
area today...subzero readings will again push across the area
tonight. The combination of northwest winds and cold temperatures
will push wind chill values well below zero tonight...with wind
chills generally dropping to minus 20 to minus 30. A Wind Chill
Advisory has been issued for the Nebraska Panhandle for tonight.
Chances for measurable snow the next several days will be on the
low side. Upper level energy moving across the area tonight may
produce some light snow showers or snow flurries with the main
potential over the mountains. Not anticipating any snow east of
the Laramie range...at least nothing more than a few flurries.
Once the wave passes chances for snow will shut down for tomorrow.
A quick moving clipper system will move across the area late
Tuesday afternoon into Tuesday night. This could bring another
brief shot of light snow but any accumulations will be minimal.
Warming trend will start tomorrow as westerly winds kick in.
Should see highs back into the 20s and 30s over most of the area
Tuesday. Along with the warmer temperatures comes the stronger
winds. High wind watches remain in place for late Monday into
Tuesday. Wind prone portions of southeast Wyoming is the main area
of concern where gusts may reach 60 miles per hour or possibly greater. Along
with the strong winds could see some blowing snow where there is
deeper snow pack on the ground.
Long term...(wednesday through sunday)
issued at 240 PM MST sun Dec 8 2013
Mainly dry weather expected over the County Warning Area during this period
outside of the higher mountains where some snow showers are possible
later in the period. A surface high will slide southeast over the northern
plains into the upper Mississippi Valley Tuesday night and Wednesday
and bring a glancing shot of cooler air to the County Warning Area plains east of
the mountains for Wednesday. Warmer Thursday and continued mild Friday as an
upper ridge moves across. A splitting upper trough will move onshore
over the West Coast and across the Rocky Mountains Friday and Saturday
with the County Warning Area basically in between the two batches of energy.
Associated Pacific front with this system should slide across
Saturday bringing modestly cooler air.
Aviation...(for the 06z tafs through 06z Monday evening)
issued at 1025 PM MST sun Dec 8 2013
A low pressure trough moving southeast across the region tonight
will bring mainly middle level cloud ceilings...which will obscure
the higher mountain peaks. Some light snow will be possible west
of the Laramie range tonight producing brief MVFR to IFR visibilities.
Otherwise...VFR conditions will prevail. Westerly surface winds
will average between 5 and 15 knots tonight...with gusts to near 30
knots in vicinity of of the mountains. These winds will increase to 15 to 25
knots with gusts to 35 knots.
issued at 408 am MST sun Dec 8 2013
Several passing disturbances along with the cold air mass will
keep fire weather concerns at Bay through early next week. Will
see periodic light snow chances through the period...although any
accumulations will remain very light. A windy period will set up
for Monday afternoon through Tuesday mainly across the typically
windy areas of southeast Wyoming. Warmer temperatures will be on
the way as well...with afternoon highs returning to normal by middle-
Wyoming...high wind watch from late Monday night through Tuesday afternoon
High wind watch from Monday afternoon through Tuesday afternoon
NE...Wind Chill Advisory until 9 am MST Monday for nez002-003-019>021-