Area Forecast Discussion
Issued by NWS Cheyenne, WY

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FXUS65 KCYS 142352
AFDCYS

Area Forecast Discussion
National Weather Service Cheyenne WY
552 PM MDT Fri Jul 14 2017

.SHORT TERM...(Tonight through Sunday Night)
Issued at 230 PM MDT Fri Jul 14 2017

Tonight...Visible satellite imagery and WSR-88d reflectivity
indicate isolated thunderstorms across western Converse and western
Carbon counties so will have isolated thunderstorms there early this
evening. Elsewhere, the atmosphere looks too dry aloft for most
thunderstorms to develop. Expect isolated thunderstorms to dissipate
by mid evening with loss of daytime heating and lack of other
forcing.

Saturday...Once again, dry air aloft will limit potential for
convective development, thus will continue with a dry forecast. High
temperatures close to today again based on 700 mb temperature
forecast.

Saturday night/Sunday...Ridging aloft weakens with slight height
falls which may allow for more isolated thunderstorm development
over our northern Laramie, Sierra Madre and Snowy Ranges in the
afternoon. Otherwise, continued mostly sunny and quite warm with
slightly warmer temperatures based on 700 mb temperatures.

Sunday night...Continued dry and mild with ridging aloft. Low
temperatures slightly warmer than Saturday night with airmass
modification.

.LONG TERM...(Monday through Friday)
Issued at 230 PM MDT Fri Jul 14 2017

Upper high will be centered across the central plains and the
Mid-Mississippi river valley through the period. Flow around the
west side of this upper high will be a favorable trajectory to
advect monsoonal moisture into the intermountain west. Timing of
individual shortwaves proves difficult in such a weak steering
flow environment. That said, most areas will see at least a daily
chance of afternoon/evening showers and thunderstorms. Temps will
slowly drift back towards seasonal norms by the end of the week.

&&

.AVIATION...(For the 00Z TAFS through 00Z Saturday evening)
Issued at 552 PM MDT Fri Jul 14 2017

Showers have developed near KRWL early this evening but do not
anticipate impacts at the terminal outside of gusty winds.
Elsewhere, breezy conditions will ease over the next hour with
generally light winds expected through Saturday morning. Could see
east-southeast wind gusts to 20kts once again Saturday afternoon.
VFR conditions will prevail.

&&

.FIRE WEATHER...
Issued at 230 PM MDT Fri Jul 14 2017

Low humidities from 15 to 20 percent Saturday and Sunday
afternoons, west of Interstate 25, and fortunately, winds will be
relatively light. Humidities not quite as low Monday and beyond.

&&

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

$$

SHORT TERM...RUBIN
LONG TERM...CAH
AVIATION...RJM
FIRE WEATHER...RUBIN



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