Area Forecast Discussion
Issued by NWS Cheyenne, WY

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FXUS65 KCYS 171021
AFDCYS

Area Forecast Discussion
National Weather Service Cheyenne WY
421 AM MDT Sat Jun 17 2017

.SHORT TERM...(Today through Monday)
Issued at 340 AM MDT Sat Jun 17 2017

Current KCYS radar loop shows light to moderate rain showers
pushing eastward along a surface frontal boundary stretching from
central Wyoming to the northern Nebraska panhandle. This front
will continue to slowly move southward this morning with showers
expected along the I-80 corridor later this morning. No thunder
has been observed with this activity, but it still possible,
especially by this afternoon with some surface heating. Kept POP
between 20 to 40 percent for widely scattered showers and isolated
thunder late this morning through this afternoon. Breezy or
locally windy conditions are expected as winds shift into the
north today, with gusts locally around 45 mph. Winds should
diminish by late this afternoon. Any remnant showers will quickly
dissipate around sunset. It will be a cooler than normal day with
highs in the 70`s.

For Sunday and Monday, The strong upper level ridge, which is
responsible for the heat wave across the desert southwest, will
build northward and nudge eastward. Temperatures will increase
back to normal by Monday 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 early next week. No
precipitation is expected due to a significant stable/dry layer
around 500mb.

.LONG TERM...(Monday Night through Friday)
Issued at 306 AM MDT Sat Jun 17 2017

A very warm/dry weather pattern should prevail through most of the
extended forecast period w/ upper-level ridging in place. Tuesday/
Wednesday are still expected to be the warmest days w/ large scale
subsidence and H7 temperatures of +16 to +18 deg C supporting high
temperatures in the 80s and 90s. A strong cold front will approach
the area on Thu/Thu night, yielding considerably cooler high temps
by Friday. Limited moisture and dynamic support will limit chances
for precipitation, but isolated showers/storms cannot be ruled out
around mid-week with any weak disturbance embedded w/in zonal mid-
level flow on the northern fringe of a flattening ridge.

&&

.AVIATION...(For the 06Z TAFS through 06Z Saturday night)
Issued at 1014 PM MDT Fri Jun 16 2017

Wyoming TAFS...VFR. Wind gusts to 30 knots at Rawlins and Laramie
until 15Z. From 15Z to 01Z, wind gusts to 35 knots at all sites.

Nebraska TAFS...VFR. Wind gusts to 34 knots from 15Z to 01Z.

&&

.FIRE WEATHER...
Issued at 306 AM MDT Sat Jun 17 2017

No Fire Weather concerns into next week due to non-
critical fuels across the area. Humidities will trend higher today
as a cold front moves southeast across the high plains. Showers
and thunderstorms are possible into this evening as this front
moves south and east into the plains. Otherwise, generally
dry conditions and warm temperatures are expected next week.

&&

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

$$

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



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