Area Forecast Discussion
Issued by NWS Cheyenne, WY

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FXUS65 KCYS 130820
AFDCYS

Area Forecast Discussion
National Weather Service Cheyenne WY
120 AM MST Mon Feb 13 2017

.SHORT TERM...(Today through Wednesday night)
Issued at 230 AM MST Mon Feb 13 2017

Ridge of high pressure will dominate the weather for the upcoming
week with sunny skies and warming temperatures each day.

Currently...1036MB surface high over eastern Idaho with ridge of
high pressure over southeast Wyoming from this high. Fog has
developed out across Sweetwater County late last night into this
morning and is fairly prevalent at Creston Junction in south
central Wyoming. So far, not seeing the fog getting into Carbon
County yet, but will keep the inherited patchy fog in for the
overnight hours out by Rawlins.

For today...700mb temperatures expected to be cooler today over
Sunday with the GFS forecasting temperatures around -6C (roughly
4C colder than yesterday). Did not stray too far from guidance on
highs today.

Winds stay northerly to northeasterly until Tuesday evening before
turning more westerly Wednesday. Think cool temperatures will
stay with us definitely for Tuesday. With stronger westerly winds
Wednesday, could start to see downsloping off the Laramie Range
that will warmer our eastern zones into the mid 60s out in the
Panhandle and low 60s along the east slopes.

.LONG TERM...(Thursday through Sunday)
Issued at 230 AM MST Mon Feb 13 2017

Thursday...Quite mild day on tap with large scale ridging aloft
centered over the Central Plains states and a surface lee trough to
the lee of the Rockies. Based on thicknesses and 700 mb
temperatures, maximum temperatures will climb to the mid 40s to near
50 degrees west of I-25, with 60s east of I-25.

Friday...Slightly cooler, though still above normal, as the ridge
flattens somewhat, and we see an increase in middle and high
cloudiness. Continued dry with limited low and mid level moisture
and lift.

Saturday...Flow aloft turns south southwest and increases in speed
in advance of the southwest upper trough. Low and mid levels still
look too dry for any significant precipitation. Continued relatively
mild for mid February based on progged thicknesses and 700 mb
temperatures.

Sunday...Slightly cooler with increase in cloud cover. Approaching
shortwave trough aloft from Colorado will help produce a chance of
precipitation across our southern counties in the afternoon, south
of a Rawlins to Scottsbluff line.

&&

.AVIATION...(For the 06Z TAFS through 06Z Monday night)
Issued at 851 PM MST Sun Feb 12 2017

VFR. Few cirrus clouds along and south of Interstate 80. Light winds
tonight, with breezy northwest winds at times by 18Z Monday.

&&

.FIRE WEATHER...
Issued at 230 AM MST Mon Feb 13 2017

High pressure over northwestern Wyoming will keep the weather dry,
but cool over southeast Wyoming and Nebraska Panhandle through the
upcoming week. north to northeast winds will keep temperatures
cool today before the warmup begins Wednesday when winds shift
more westerly. Warmer temperatures will create afternoon
humidities that are expected to fall into the low to mid teens
Wednesday and Thursday. Could see critical winds and humidities
both days. But fuels have been reported not ready and mountains
have a substantial snowpack. Therefore...fire weather concerns are
minimal.

&&

.CYS WATCHES/WARNINGS/ADVISORIES...
WY...None.
NE...None.
&&

$$

SHORT TERM...GCC
LONG TERM...RUBIN
AVIATION...RUBIN
FIRE WEATHER...GCC



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