Area Forecast Discussion
Issued by NWS Riverton, WY

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FXUS65 KRIW 132222
AFDRIW

Area Forecast Discussion
National Weather Service Riverton WY
422 PM MDT Sun Aug 13 2017

.SHORT TERM...(This evening through Wednesday)
Issued at 204 PM MDT Sun Aug 13 2017

As a Pacific low pressure trough over British Columbia, the Pacific
Northwest and Northern California moves east into the Northern
Rockies and Great Basin, west southwest flow aloft will increase
across the area bringing pacific moisture and scattered showers and
thunderstorms to the area tonight and Monday.  Convection will be
strongest and most numerous over the western and northern mountains.
Small hail, strong wind gusts and locally heavy rain will be
possible. Tuesday the trough will pass through the area with
continued showers and thunderstorms with colder temperatures as a
cold front sweeps south and east.  Cooler and more stable air will
be over the area Wednesday with decreased shower and thunderstorm
activity.

.LONG TERM...(Wednesday night through Sunday)
Issued at 204 PM MDT Sun Aug 13 2017

As the Pacific trough moves east of the area Wednesday night and
Thursday, drying will occur.  Isolated showers and thunderstorms
will be possible in the north on Thursday, then a prolonged dry
period is expected Friday through Sunday with warming.  |

&&

.AVIATION...(For the 00Z TAFS through 00Z Monday evening)
Issued at 204 PM MDT Sun Aug 13 2017

VFR conditions will prevail through the forecast period. An upper
level disturbance moving across WY will continue widely scattered to
locally scattered showers and thunderstorms through early evening
along and west of the Divide...isolated to widely scattered east of
the Divide also through early evening. Storm and shower coverage
will decrease after 02z. Brief heavy rain, small hail and erratic
gusty winds G25-45kt can be expected at times. Additionally, brief
periods of MVFR in lower VSBY and CIGS will also be possible during
periods of heaviest activity. Mountains will be partially obscured
at times tonight. Another upper level disturbance will arrive across
western and northwestern WY Monday morning with showers and isolated
thunder possible over that area after 10z Monday morning...then
expanding across the northern half of WY by mid-day. Strong or an
isolated severe storm over Johnson County late afternoon or early
evening.

&&

.FIRE WEATHER...
Issued AT 204 PM MDT Sun Aug 13 2017

As a Pacific low pressure trough over British Columbia, the Pacific
Northwest and Northern California moves east into the Northern
Rockies and Great Basin, west southwest flow aloft will increase
across the area bringing pacific moisture and scattered showers and
thunderstorms to the area tonight and Monday.  Convection will be
strongest and most numerous over the western and northern mountains.
Small hail, strong wind gusts and locally heavy rain will be
possible. Tuesday the trough will pass through the area with
continued showers and thunderstorms with colder temperatures as a
cold front sweeps south and east.  Cooler and more stable air will
be over the area Wednesday with decreased shower and thunderstorm
activity.  Afternoon mixing and transport winds will support very
good to excellent smoke dispersal through Wednesday.

&&

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

$$

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


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