Area Forecast Discussion
Issued by NWS Cheyenne, WY

Home | Current Version | Previous Version | Text Only | Print | Product List | Glossary Off
Versions: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50

065
FXUS65 KCYS 151041
AFDCYS

Area Forecast Discussion
National Weather Service Cheyenne WY
441 AM MDT Tue Aug 15 2017

.SHORT TERM...(Today through Thursday)
Issued at 240 AM MDT Tue Aug 15 2017

Some showers along with a tstm or two lifting northeastward across
the CWA early this morning, likely in association with a shortwave
now moving into southern Wyoming.  Expect these to continue moving
northeast early this morning with a short lull in pcpn after that.

The main upper trough currently over the western CONUS will move
east today and tonight and will bring another round of showers
and tstms to much of the CWA.  Instabilities not as great today
with the highest amounts over the southeast half of the Panhandle,
where CAPEs around 1500-2000J/kg progged there this afternoon.
Shear not impressive but could still see a few strong storms in
that area later today. CAPE falls off fairly quickly this evening
with pcpn being more showers as the evening progresses.  A cool
front will slide east over the area this evening bringing a little
cooler air for Weds.  Warmer again Thursday as return flow sets up
with some isolated convection possible.

.LONG TERM...(Thursday night through Monday)
Issued at 240 AM MDT Tue Aug 15 2017

Drier pattern setting up for the long term as upper ridge builds
in from the west. Getting back to normal August like weather.

Could be some showers and thunderstorms Sunday and Monday, but
overall, the ridge is forecast to hold and believe most locations
should stay dry.

&&

.AVIATION...(For the 12Z TAFS through 12Z Wednesday morning)
Issued at 431 AM MDT Tue Aug 15 2017

Latest HRRR guidance has thunderstorms initially beginning out by
KRWL around 20Z, spreading east. Looks like all airports will be
impacted as coverage will be pretty widespread by late afternoon
into the evening hours. MVFR conditions possible under the heavier
showers.

&&

.FIRE WEATHER...
Issued at 240 AM MDT Tue Aug 15 2017

Fire weather concerns expected to remain low for the rest of the
week with non-critical weather conditions. Scattered to numerous
showers and storms today with wetting rains likely from most of
them. A drier pattern will then ensue to close out the week.

&&

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

$$

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



USA.gov is the U.S. government's official web portal to all federal, state and local government web resources and services.