Area Forecast Discussion
Issued by NWS Riverton, WY

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FXUS65 KRIW 182027
AFDRIW

Area Forecast Discussion
National Weather Service Riverton WY
227 PM MDT SUN SEP 18 2016

.Short Term...Tonight Through Monday

Increasing west flow aloft will continue to bring limited
moisture will bring some light showers to the northern
mountains...and warmer temperatures. across the south windy
conditions will develop by noon Monday. Relative humidity will
become quite low combining with the strong wind gusts and
critically dry fuels producing conditions favorable for fires with
rapid rates of spread.

.Long Term...Monday Night Through Sunday

The flow aloft will continue to increase and slowly shift to the
southwest Tuesday with continued windy areas and low relative
humidity and a few showers across the north as temperatures
continue to warm. Monday night through tuesday night.  As a low
pressure trough in the eastern Pacific moves east towards the west
coast...moisture will increase in the southwest flow with
increasing afternoon and evening showers and isolated
thunderstorms across the western mountains Thursday.  Showers
will become widespread and spread east with much of the area
receiving precipitation Thursday through Friday with significant
cooling. Significant snowfall may develop in the mountains
Thursday night lifting to the higher mountains on Friday.
Precipitation is expected to decrease on Saturday as the Pacific
trough moves east of the area and cold northwest flow spreads over
the area. Clearing will occur Saturday night with cold
temperatures as high pressure builds in from the west. Sunday
looks dry with slow warming.

&&

.Aviation.../00Z Issuance/

VFR conditions will prevail through the forecast period. Some
isolated showers will occur at times over the northwest mountains
tonight. VCSH at the KJAC terminal through 10Z and at KCOD through
04Z. A few showers are also expected  over the northern Bighorn
mountains overnight. Most locations in Wyoming will be breezy to
windy with terminals seeing wind gusts between 25 and 35 knots
through 02Z. The wind will decrease between 01z and 02z for most
locations. Wind shear will the be an issue for most terminal sites
this this evening...and at many sites through 10-12Z.

&&

.Fire Weather...

...Fire Weather Watch for low relative humidity and strong wind
gusts noon to 8 pm mdt Monday zones 277 279 and 289...

Increasing west flow aloft will continue to bring limited
moisture will bring some light showers to the northern
mountains...and warmer temperatures. across the south windy
conditions will develop by noon Monday. Relative humidity will
become quite low combining with the strong wind gusts and
critically dry fuels producing conditions favorable for fires with
rapid rates of spread.

&&

.RIW Watches/Warnings/Advisories...
Fire Weather Watch from Monday afternoon through Monday evening
for WYZ277-279-289.

&&

$$

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



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