Area Forecast Discussion
Issued by NWS Riverton, 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

000
FXUS65 KRIW 162054
AFDRIW

Area Forecast Discussion
National Weather Service Riverton WY
254 PM MDT Sun Jul 16 2017

.SHORT TERM...(This evening through Wednesday)
Issued at 254 PM MDT Sun Jul 16 2017

A large upper level high pressure ridge will remain across the Great
Basin and Desert Southwest into the Southern Plains will remain in
place into midweek with the polar jet across the Pacific Northwest
and Southern Canada, which will push a series of weak cold fronts
south across the area.  Little variation in temperatures and Relative
humidity is expected.  The air mass will be most unstable
in the afternoons and early evening hours with scattered showers
and isolated thunderstorms with strong win gusts.  Overall winds
will be light except for the thunderstorm outflow winds.

.LONG TERM...(Wednesday night through Sunday)
Issued at 254 PM MDT Sun Jul 16 2017

A large upper level high pressure ridge will remain across the Great
Basin and Desert Southwest into the Southern Plains will remain in
place Wednesday night through Sunday with the polar jet across the
Pacific Northwest and Southern Canada, which will push a series of
weak cold fronts south across the area.  Little variation in
temperatures and Relative humidity is expected.  The air mass will
be most unstable in the afternoons and early evening hours with
scattered showers and isolated thunderstorms with strong win gusts.
Overall winds will be light except for the thunderstorm outflow winds.

&&

.AVIATION...(For the 18Z TAFS through 18Z Monday afternoon)
Issued at 254 PM MDT Sun Jul 16 2017

VFR conditions will prevail through the forecast period. A cold
front will push southeast across the region this evening. Isolated
to widely scattered showers and thunderstorms will develop a few
hours ahead of and then along/near the cold front, primarily through
06z tonight. A few strong thunderstorms are possible vicinity and
north of a KEVW-KBYG line that may produce small hail and strong
wind gusts 40-55 kts. Drier air and clearing will follow the front
east across the area tonight. Another weak upper level disturbance
and associated surface front will then move across Wyoming after 10Z
Monday morning providing chances for isolated showers Monday morning
along/near/south of a KAFO-KBYG line. By afternoon Monday...
generally after 20Z...the usual diurnal chances for mainly isolated
thunderstorms over and near mountains and a left over frontal
boundary will arise ahead of a frontal passage due that evening.

&&

.FIRE WEATHER...
Issued AT 254 PM MDT Sun Jul 16 2017

A large upper level high pressure ridge will remain across the Great
Basin and Desert Southwest into the Southern Plains will remain in
place into midweek with the polar jet across the Pacific Northwest
and Southern Canada, which will push a series of weak cold fronts
south across the area.  Little variation in temperatures and Relative
humidity is expected.  The air mass will be most unstable
in the afternoons and early evening hours with scattered showers
and isolated thunderstorms with strong win gusts.  Overall winds
will be light except for the thunderstorm outflow winds.  Afternoon
mixing heights will be favorable with sufficient transport winds for
very good to excellent smoke dispersal.

&&

.RIW WATCHES/WARNINGS/ADVISORIES...
NONE.
&&

$$

SHORT TERM...Baker
LONG TERM...Baker
AVIATION...Braun
FIRE WEATHER...Baker



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