Area Forecast Discussion
Issued by NWS Riverton, WY

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FXUS65 KRIW 171918
AFDRIW

Area Forecast Discussion
National Weather Service Riverton WY
118 PM MDT Thu Aug 17 2017

.SHORT TERM...(This evening through Friday)
Issued at 112 PM MDT Thu Aug 17 2017

Shortwave passing sewd across the area with considerable cloud cover
across the far north and some very limited instability east of the
divide. Expanded our isold coverage to cover most of the far e/sern
zones. Shortwave ridge builds in Friday with no tstms expected in
our forecast area. Will likely see some buildups over the higher
peaks but anything that could possibly form will likely be short
lived and weak (and over the highest terrain). Another warm, dry day
Saturday as ridge flattens with only a few storms possibly forming
off the Uintas and clipping swrn Sweetwater County. Pattern changes
Sunday as California low forms and flow backs to the wsw/sw which
brings some mid level moisture and multiple weak ripples in the
flow. Shower/storm chances increase Sunday across the far west and
off the Uintas into srn Sweetwater.

.LONG TERM...(Friday night through Thursday)
Issued at 112 PM MDT Thu Aug 17 2017

.LONG TERM...Sunday night through Thursday

Eclipse outlook on Monday...The Canadian seems to do the best job as
depicting two shortwaves tracking east southeast across the area,
one Sunday night and the next one Monday night with subsidence in
between during the mid day hours. The GFS has one weaker shortwave
coming through during more of the daylight hours Monday, which is
faster than previous runs, along with the Euro showing somewhat more
of a flatter flow with the most distinguishable shortwave coming
through Sunday night. Also the GFS is showing a southern stream vort
moving in from the southwest Monday. For now, the consensus is a 30
to 60 percent cloud cover along the path of totality during the
eclipse. Most of these clouds will be of the high and mid cloud
variety with the cumulus build ups, mainly over the mountains where
only isold shower or thunderstorm activity is expected between
shortwaves.

For Tuesday, more isolated shower activity is slated for early to
mid afternoon as the shortwave exits the area. For Wednesday and
Thursday, after a relatively flat ridge exits to the east, the
steering flow will back to the southwest ushering in more moisture
and increasing PWs with an increasing chance of late day
thunderstorms.

Temperatures will cool off a few degrees Monday from the added
clouds, then warming a few degrees Tuesday and Wednesday as ridging
builds in from the west. Thursday will be a few degrees cooler with
the added showers. Overall, temperatures will be rather seasonal
with highs generally in the 80s east of the divide through the
period and 70s west. Highs will be in the 50s and 60s in the
mountains.

&&

.AVIATION...(For the 00Z TAFS through 00Z Friday afternoon)
Issued at 112 PM MDT Thu Aug 17 2017

VFR conditions will occur at the terminal sites through the period.
Isolated showers and thunderstorms will occur across the mountains
along and east of the divide and from Eastern Sweetwater County up
through Natrona and Johnson County until 03Z. Expect brief
mountain obscuration at times. VFR conditions are expected Friday.

&&

.FIRE WEATHER...
Issued AT 112 PM MDT Thu Aug 17 2017

A weak southeast moving shortwave will keep isolated thunderstorm
chances across the continental divide and far eastern zones into
early this evening. Breezy to locally windy conditions will prevail
across western and southern Wyoming into early this evening.
Elevated fire conditions will remain across some of the lower
elevations where breezes blow due to low min rh`s and local gusts
around 20 mph. Friday looks like a dry and warm day with min rh`s in
the teens to around 20 across the lower elevations with 20s and 30s
in the high country. Saturday will be another dry and quite warm day
with min rh`s likely a few degrees lower than Friday.

&&

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

&&

$$

SHORT TERM...Skrbac
LONG TERM...Lipson
AVIATION...Lipson
FIRE WEATHER...Skrbac


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