Area Forecast Discussion
Issued by NWS Cheyenne, WY

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FXUS65 KCYS 170900

Area Forecast Discussion
National Weather Service Cheyenne WY
300 AM MDT Thu Aug 17 2017

.SHORT TERM...(Today through Saturday)
Issued at 300 AM MDT Thu Aug 17 2017

Temperatures and fire weather concerns are the forecast challenge
through the short term.

Currently...CWFA pretty much cloud free this morning with surface
high over central Colorado and surface ridge over much of
southeast Wyoming. An area of low pressure over northeastern
Montana this morning with surface trough extending south to

A breezy day today across southeast Wyoming. GFS forecast
soundings showing us mixing down from 560mbs, so wind gusts of
25kts are possible today, especially out west of the Laramie
Range. Kept slight chance of thunderstorms going today, mainly for
the mountains as a clipper system tracks across northeastern
Wyoming this afternoon. Think for the most part, most locations
will stay dry.

Warmer and drier for Friday and Saturday as ridge continues to
build into the area. Got some pretty low afternoon humidities for
out west (Rawlins) Friday and more widespread Saturday.
Fortunately, winds should stay below 20kts on forecast soundings,
so fire weather concerns should be low.

.LONG TERM...(Saturday night through Wednesday)
Issued at 300 AM MDT Thu Aug 17 2017

Warm and mainly dry weather should prevail over the CWA into early
next week with rather flat ridging over the southern CONUS. Some
convection possible mainly over the mtns both Sunday and Monday
afternoons as a little moisture edges northward. Tuesday and Weds
should see some uptick in convection as upper ridging builds over
the Rocky Mtn chain and monsoonal moisture increases over the
region.  Otherwise continued seasonably warm through the period.


.AVIATION...(For the 12Z TAFS through 12Z Friday morning)
Issued at 300 AM MDT Thu Aug 17 2017

VFR prevailing through the period. Some gusty winds from KRWL to
KLAR this afternoon with gusts from 20 to 25 knots. Widely sctd
showers and tstms mainly around the se Wy mtns this afternoon.


Issued at 300 AM MDT Thu Aug 17 2017

Drier and warmer conditions expected as ridge of high pressure
builds into the area. Could see elevated fire weather conditions
Friday and Saturday as afternoon humidities fall to critical
levels. Fortunately, winds should remain under 25 MPH during those
days. Expect fair overnight recoveries in humidity. Next front to
move into the area Sunday.




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