Area Forecast Discussion
Issued by NWS Riverton, WY

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FXUS65 KRIW 231156

Area Forecast Discussion
National Weather Service Riverton WY
556 AM MDT Fri Mar 23 2018

.UPDATE...Winter weather highlights allowed to expire at 6 AM MDT
this morning. Snow to taper off and end this morning in the western
mountains. No other updates at this time.

.SHORT TERM...Today through Sunday night
Issued at 300 AM MDT Fri Mar 23 2018

The precip from the Pacific system will continue to lessen this
morning at the upper level support moves to the east. A weak inced
ridge will allow for one more day of warm weather with mostly dry
conditions. A few showers will linger over the mountains, especially
in the west. Saturday morning the next Pacific system will enter the
western states and precip will begin to increase in the western
mountains and valleys. This system will bring mostly sub-advisory
snow amounts west of the divide with the exception of the Tetons
which could see 7 to 9 inches. As the upper level trough continues
to push east, cooler temps and rain will begin to seep across the
area Sunday. Sunday night 700 mb temps are indicated to drop to the
area of -10C allowing for a change to snow in areas east of the

.LONG TERM...Monday through Friday
Issued at 300 AM MDT Fri Mar 23 2018

Snow in the central and eastern zones still seems on track Monday
with the snow tapering off during the afternoon hours. Scattered
areas of light snow in the rest of the area. Any lingering snow will
be ending Monday evening with partial clearing late Monday night.
Tuesday looks dry for the area. Moisture increases across the north
late Tues night ahead of another weather system and cold front that
moves through the region Wednesday. Will have a chance of rain and
snow in the north late Tue night. A chance of rain and snow in the
north Wednesday spreading into the central zones Wed afternoon and
evening. Still need to watch how this weather system evolves with
time. Dry most areas Thursday with only isolated snow showers in the
mountains. Next Friday scattered rain and snow will be moving back
into the north ahead of the next weather system. Dry conditions are
expected for the central south next Friday. As for high temperatures,
a cold day Monday, then a little milder Tue. Should be a little
cooler Wed, then milder next Thurs and Fri.


.AVIATION...For the 12Z TAFS through 12Z Saturday
Issued at 300 AM MDT Fri Mar 23 2018

West of the Continental Divide...KJAC, KBPI, KPNA, and KRKS

Second precipitation shield is sliding east across the forecast area
early this morning. The best chance for IFR/MVFR will come at KJAC
through 11Z/Fri. Temperatures have hovered between 32-34F, and
precipitation type may continue to wobble between light rain and
light snow. Shortwave energy and a trailing cold front will push
east Friday morning with the precipitation falling off after
11Z/Fri. Weak west-northwest flow will allow for lingering light
snow at KJAC through Friday morning. There could still be a brief
period of MVFR at KBPI and KPNA until about 11Z/Fri, but any
downturn in conditions will be brief. Drier conditions will be
ushered into the area by late morning with this trend continuing
through the remainder of the day. All terminals will be VFR by
18Z/Fri. Still expect gusty west-northwest wind this afternoon at
KBPI, KPNA, and KRKS. Mountain obscurations will be frequent through

East of the Continental Divide...KCPR, KCOD, KRIW, KLND, and KWRL

Conditions will be VFR through 12Z/Fri. KCPR has the best chance for
brief MVFR this afternoon as a weak cold front sags south and
shortwave energy tracks east through the central part of the state.
The potential is relatively low. Scattered weak showers are possible
this afternoon but these would be brief. South to southwest surface
wind will veer to the northwest by this afternoon and continue
longest at KRIW. Mountain tops along the Continental Divide will be
frequently obscured through this morning.

Please see the Aviation Weather Center and/or CWSU ZDV and ZLC for
the latest information on icing and turbulence forecasts.


Issued AT 300 AM MDT Fri Mar 23 2018

Rain and snow will continue to linger in the western mountains and
valleys but other areas will be dry and warm until early tomorrow
morning. Lower elevations east of the divide will reach into the
lower 60s but winds and RH should remain favorable. Westerly winds
from Lincoln through Sweetwater Counties will be gusty through the
afternoon. The next frontal system is Saturday and will have a
slight chance for lightning but is expected to produce decent





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