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000
FXUS65 KRIW 282052
AFDRIW

Area Forecast Discussion
National Weather Service Riverton WY
252 PM MDT WED SEP 28 2016

.Short Term...Tonight Through Thursday

A rather warm upper level low pressure trough over Southern
California and the Desert Southwest will move north northeast
bringing increased mid and upper level moisture into western Wyoming
with some showers developing over the southwest mountains tonight.
The low will weaken significantly as it moves north but will
continue to pump up moisture into Wyoming with increased clouds...
showers and isolated thunderstorms Thursday with generally mild
temperatures.

.Long Term...Thursday Night Through Wednesday

Showers and isolated thunderstorms will continue over the area
Thursday evening and Friday with continue mild temperatures as
southwest flow aloft continues. there will be a decrease in
convection on Saturday with an increase saturday evening as an
upper level low pressure trough approaches from the west. As the
main Pacific trough moves east and cuts off in the western Great
Basin...showers will increase across the area as the flow aloft
becomes more southerly Sunday and Monday. By Monday night some
mountain snow will be possible above 9000 feet. Tuesday the low
will move across Wyoming with colder temperatures and snow levels
decreasing to around 8500 feet. Tuesday night and Wednesday the
flow aloft will become northwest as the low loves east into the
Northern Plains. Precipitation will decrease with colder
temperatures.

&&

.Aviation.../00Z Issuance/

West of the Continental Divide...KJAC/KBPI/KPNA/KRKS

Cloud cover will increase through the evening as an area of low
pressure advances towards the state. This upcoming system will
introduce showers across southwestern Wyoming after 08z this
evening. Shower coverage will increase through the forecast period,
with some thunderstorm development possible after 18z. Gusty,
variable wind may accompany storms Thursday afternoon. Additionally,
with the potential for shower activity, expect periodic mountain
obscurations due to lowered ceilings.

East of the Continental Divide...KCOD/KCPR/KLND/KRIW/KWRL

VFR conditions anticipated through much of the evening for the
majority of the area. The exception may be the Wind River mountains,
which may see some isolated shower activity from an approaching area
of low pressure. Cloud cover will increase across the area, though
much of the area will see no other impact through 00z Friday. The
central mountain passes, and terminals adjacent to these passes may
see some isolated showers and thunderstorms after 18z Friday. This
activity looks best to impact a line west of KCOD-KLND-KRWL.
Mountain obscurations will also be possible with shower activity in
and around the mountains.

&&

.FIRE WEATHER...

A rather warm upper level low pressure trough over Southern
California and the Desert Southwest will move north northeast
bringing increased mid and upper level moisture into western Wyoming
with some showers developing over the southwest mountains tonight.
The low will weaken significantly as it moves north but will
continue to pump up moisture into Wyoming with increased
clouds...showers and isolated thunderstorms Thursday and Friday with
generally mild temperatures.

&&

.RIW Watches/Warnings/Advisories...
None.
&&

$$

SHORT TERM...C.Baker
LONG TERM...C.Baker
AVIATION...Branham
FIRE WEATHER...C.Baker