Area Forecast Discussion
Issued by NWS Cheyenne, WY

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000
FXUS65 KCYS 180910
AFDCYS

Area Forecast Discussion
National Weather Service Cheyenne WY
310 AM MDT Sun Jun 18 2017

.SHORT TERM...(Today through Monday night)
Issued at 310 AM MDT Sun Jun 18 2017

Current IR satellite loop shows some low clouds lingering across
the high plains of southeast Wyoming and into the southern
Nebraska panhandle early this morning. These clouds have kept the
temperatures along the I-80 corridor from falling too much, but
recent trends show the clouds dissipating over the next few hours.
Temperatures are chilly for this time of the year and generally in
the 40`s, with a few areas in the upper 30`s. Temperatures will
rebound by this afternoon with highs in the 70`s under mostly
sunny to partly cloudy skies. It should be dry across the area
today, but can not rule out a few sprinkles along and north of the
Pine Ridge, including Lusk and Chadron as some jet energy moves
eastward. Kept POP below 10 percent since the boundary layer will
be pretty dry and measurable precipitation is not expected due to
limited instability.

For Monday, The strong upper level ridge which is responsible for
the heat wave across the desert southwest, will begin to build
northward and nudge eastward through the day. Temperatures will
increase back to normal in the afternoon with highs in the upper
70`s to middle 80`s. The high plains will remain in northwesterly
flow aloft, so temperatures will be slow to increase. No
precipitation is expected Monday and Monday night due to a
significant stable/dry layer around 500mb.

.LONG TERM...(Tuesday through Saturday)
Issued at 250 AM MDT Sun Jun 18 2017

Overall next week looks fairly quiet and warm through Thursday as
the upper ridge over the southwestern states builds a little
farther to the east. There are some small chances for showers and
thunderstorms Wednesday as a minor shortwave moves southeast
across Wyoming and Nebraska in the weak northwesterly flow aloft
on the eastern side of the upper ridge. By late next week, we
expect to see another cold front move down from the north as a
stronger upper trough digs southeastward across the northern and
central Rockies. We have trended temperatures down a few degrees
for Friday and Saturday.

&&

.AVIATION...(For the 06Z TAFS through 06Z Sunday night)
Issued at 1052 PM MDT Sat Jun 17 2017

Wyoming TAFS...VFR. Wind gusts to 27 knots from 15Z to 01Z.

Nebraska TAFS...VFR. Wind gusts to 20 knots at Sidney and Alliance
from 15Z to 01Z.

&&

.FIRE WEATHER...
Issued at 236 AM MDT Sun Jun 18 2017

Warm and dry conditions are expected by the middle of this week
with relative humidities around 15 percent in the afternoon west
of the Laramie Range. Winds are expected to be light with green
fuels, so no Fire Weather concerns are anticipated. A strong cold
front may impact the region later this week and into next weekend
with cooler temperatures and a better chance of precipitation.

&&

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

$$

SHORT TERM...TJT
LONG TERM...JG
AVIATION...RUBIN
FIRE WEATHER...TJT



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