Area Forecast Discussion
Issued by NWS Cheyenne, WY

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FXUS65 KCYS 221130
AFDCYS

Area Forecast Discussion
National Weather Service Cheyenne WY
530 AM MDT Sat Apr 22 2017

.UPDATE...
Issued at 313 AM MDT Sat Apr 22 2017

Radar showing area of precip shifting eastward off the Summit this
morning. Went ahead and cancelled the Winter Weather Advisory this
morning and replaced it with a Dense Fog Advisory through 9 AM.
Webcams up there showing very low visibilities, so Dense Fog
Advisory warranted. Updates have been sent.

&&

.SHORT TERM...(Today through Monday)
Issued at 200 AM MDT Sat Apr 22 2017

Area still under influence of inverted trough along the Laramie
Range this morning. Southeast upsloping flow keeping stratus for
areas east of the Laramie Range. WYDOT webcams over the Summit
still showing pretty good snowfall up that way, so will continue
the Advisory for that area this morning.

Upper trough moves to the east through the morning today with
rain/snow coverage decreasing. By this afternoon, most locations
should be dry.

Transitory shortwave ridge tonight into Sunday should keep the
area dry. Could be a little windy Sunday especially west of the
Laramie Range as GFS 700mb winds increase to 35-40kts.

Next Pacific front still on track for Sunday night/Monday. GFS and
ECMWF has showers confined to areas west of the Laramie Range for
most of the day Monday. Could see some afternoon convection east
Monday.

.LONG TERM...(Monday night through Friday)
Issued at 200 AM MDT Sat Apr 22 2017

Monday night/Tuesday...Next low amplitude shortwave trough aloft
moves overhead Monday night, with scattered showers, with the snow
level above 7000 feet. The shortwave trough aloft moves into the
central plains states on Tuesday, though still producing a chance of
showers over our counties with plenty of low and mid level moisture
and upslope in the low levels.

Wednesday...Really minimal drying out period Tuesday night, with
increasing coverage of showers on Wednesday due to plenty of low and
mid level moisture and low level convergence along a surface trough
over southeast Wyoming. Relatively cool with all the cloud cover and
chances for rain.

Thursday...The upper low develops over Wyoming and Colorado Monday
night/Tuesday...Next low amplitude shortwave trough aloft moves
overhead Monday night, with scattered showers, with the snow level
above 7000 feet. The shortwave trough aloft moves into the
central plains states on Tuesday, though still producing a chance
of showers over our counties with plenty of low and mid level
moisture and upslope in the low levels.

Wednesday...Really minimal drying out period Tuesday night, with
increasing coverage of showers on Wednesday due to plenty of low and
mid level moisture and low level convergence along a surface trough
over southeast Wyoming. Relatively cool with all the cloud cover and
chances for rain.

Thursday...The upper low develops over Wyoming and Colorado, with
the mid level low over eastern Colorado. Although the greatest
coverage of precipitation will be to our southeast closer to the
mid level low, there will be enough low and mid level moisture for a
chance of showers over our counties into Thursday afternoon.

Friday...The upper low moves off to our northeast, with some
atmospheric drying over our counties. Though, with adequate low and
mid level moisture and afternoon instability, expect isolated to
scattered afternoon showers once again.rado, with the mid level
low over eastern Colorado. Although the greatest coverage of
precipitation will be to our southeast closer to the mid level
low, there will be enough low and mid level moisture for a chance
of showers over our counties into Thursday afternoon.

Friday...The upper low moves off to our northeast, with some
atmospheric drying over our counties. Though, with adequate low and
mid level moisture and afternoon instability, expect isolated to
scattered afternoon showers once again.

&&

.AVIATION...(For the 12Z TAFS through 12Z Sunday morning)
Issued at 527 AM MDT Sat Apr 22 2017

Wyoming TAFS...MVFR at Rawlins until 15Z, then VFR. Occasional
MVFR at Laramie through 15Z, then VFR. IFR at Cheyenne until 14Z,
then MVFR until 16Z, then VFR.

Nebraska TAFS...VFR, except periods of IFR or MVFR through 15Z at
Alliance, Scottsbluff and Sidney.

&&

.FIRE WEATHER...
Issued at 200 AM MDT Sat Apr 22 2017

Minimal fire weather concerns as much of the area has received
rain and/or snow the past 24 hours. Weekend looks dry for the most
part as high pressure will be in control of the weather. Next cold
front begins to move in from the west Sunday night into Monday
with increasing chances for wetting rains and mountain snow.

&&

.CYS WATCHES/WARNINGS/ADVISORIES...
WY...Dense Fog Advisory until 9 AM MDT this morning for WYZ116-117.

NE...None.
&&

$$

UPDATE...GCC
SHORT TERM...GCC
LONG TERM...RUBIN
AVIATION...RUBIN
FIRE WEATHER...GCC


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