High Wind Warning 24, NWS Cheyenne, WY

929 
WWUS75 KCYS 240219
NPWCYS

URGENT - WEATHER MESSAGE
National Weather Service Cheyenne WY
819 PM MDT Thu May 23 2019

WYZ116-240330-
/O.CAN.KCYS.FG.Y.0012.000000T0000Z-190524T0600Z/
South Laramie Range-
Including the cities of Buford, Pumpkin Vine, and Vedauwoo
819 PM MDT Thu May 23 2019

...DENSE FOG ADVISORY IS CANCELLED...

The National Weather Service in Cheyenne has cancelled the Dense
Fog Advisory since visibilities have improved over the Southern
Laramie Range.

$$

WYZ110-115-241200-
/O.CON.KCYS.HW.W.0024.000000T0000Z-190524T1200Z/
North Snowy Range Foothills-Laramie Valley-
Including the cities of Arlington, Elk Mountain, Bosler, 
and Laramie
819 PM MDT Thu May 23 2019

...HIGH WIND WARNING REMAINS IN EFFECT UNTIL 6 AM MDT FRIDAY...

* TIMING...Through 6 AM Friday.

* WINDS...Winds will ease some for a time this evening then switch 
  out of a westerly direction with strong gusts later tonight. 

* IMPACTS...Mostly to travel.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A High Wind Warning means a hazardous high wind event is expected
or occurring. Sustained wind speeds of at least 40 mph or gusts
of 58 mph or more can lead to property damage.

&&

$$

Rubin

175 
WWUS75 KCYS 241155
NPWCYS

URGENT - WEATHER MESSAGE
National Weather Service Cheyenne WY
555 AM MDT Fri May 24 2019


WYZ110-115-241300-
/O.EXP.KCYS.HW.W.0024.000000T0000Z-190524T1200Z/
North Snowy Range Foothills-Laramie Valley-
Including the cities of Arlington, Elk Mountain, Bosler, 
and Laramie
555 AM MDT Fri May 24 2019

...HIGH WIND WARNING WILL EXPIRE AT 6 AM MDT THIS MORNING...

The National Weather Service in Cheyenne has cancelled the High
Wind Warning since wind gusts have diminished over the area. 
Breezy conditions will continue through noon today.

$$

Area Forecast Discussion
National Weather Service Cheyenne WY
1159 AM MDT Thu May 23 2019

.UPDATE...
Issued at 1133 AM MDT Thu May 23 2019

...Please see latest 18Z aviation discussion...

&&

.SHORT TERM...(Today and tonight)
Issued at 443 AM MDT Thu May 23 2019

Current low pressure system affecting our forecast area is
centered over the triple point of AZ/CA/NV border lifting north-
northeast. As additional moisture is advected in, precipitation
chances will increase once more primarily for the afternoon and
evening period but temperatures will be on the warmer side in the
40s and 50s for many keeping only the higher elevations in the
mountains as snow with rain elsewhere. Upwards of close to a
quarter of an inch of liquid precipitation possible through today
on top of an already saturated soil.

Main concern for today in terms of the precipitation will be the
possibility of rain on snow from the SE WY mountains to the Pine
Ridge across the NE Panhandle. Potential for rapid snowmelt from
rain in addition to saturated soil will likely lead to some area
streams rapidly rising warranting the need for flood products.
Flood Advisory remains in effect for the White River from Whitney
to the SD/NE state line where the gauge there has remained steady
in minor flood stage overnight.

Temperatures for the overnight period will be from the low to
upper 30s with precipitation slowly diminishing as a low pressure
system lifts into the Dakotas with downslope flow drying things
out.

.LONG TERM...(Friday through Wednesday)
Issued at 443 AM MDT Thu May 23 2019

With downslope flow in between systems, precipitation chances
across the High Plains are dry for Friday late morning and
afternoon with some minor forcing and moisture for showers and
thunderstorms across Carbon County with snow across the Snowy and
Sierra Madre Ranges. New snow accumulation of up to 2 inches
possible.

Otherwise some minor vorticity advection and diurnal heating
should suffice to form some isolated to scattered elevated
showers and non-severe thunderstorms in the afternoon of Saturday
and Sunday before a Pacific low drops across Utah Monday into our
forecast area on Tuesday for another round of thunderstorms some
possibly severe given warm daytime temps into the upper 50s to mid
60s and dewpoints in the 40s. Warm 850 and 750 temperatures should
limit snow primarily to the mountains with rain in the valleys and
high plains through Tuesday evening as the upper level low ejects
into the central plains. GFS is more progressive over the EURO
regarding the ejection of the mid level low into the central
plains. Should the system move out faster northwest flow will cool
things off as moisture flow is cut off for dry conditions but if
the slower progression holds lingering showers and thunderstorms
will continue into Wednesday afternoon.

&&

.AVIATION...(For the 18Z TAFS through 18Z Friday afternoon)
Issued at 1133 AM MDT Thu May 23 2019

Lots of low clouds today across the area keeping ceilings at MVFR
thresholds for most of the TAF sites. As an upper level system
moves east northeast, vorticity advection will increase rising
motion over the area. This forcing combined with lots of moisture
at the surface will bring rain and snow chances this afternoon and
tonight. This will bring ceilings for all sites down to MVFR.
Depending on where heavier precipitation develops, a few sites
could also get down to IFR.

&&

.FIRE WEATHER...
Issued at 331 AM MDT Thu May 23 2019

Fire weather concerns will remain low through the period with the
recent precipitation and a period of unsettled weather with almost
daily chances of afternoon showers and thunderstorms. Saturday and
Sunday will have the lowest forecasted Min RHs from the mid 20s in
Carbon County to the mid 30s across the WY High Plains. Wind gusts
over the weekend will generally be in the mid to upper teens.

&&

.HYDROLOGY...
Issued at 342 AM MDT Thu May 23 2019

With the recent wet, heavy snowfall across the area, initial
reports have area streams and creeks on the rise with portions of
the White River out its banks at Hwy 385. The White River sensor
at the NE/SD border has plateaued in minor flood stage this
morning but over a foot of snow depth along the Pine Ridge of the
recent wet, heavy snow will continue feeding into the tributaries
considering the limited soil capacity for additional moisture. A
Flood Advisory remains in effect until 9 AM this morning but
considering the ongoing impacts and little expected relief given
an active wet pattern in the forecast may likely need to be
extended. Biggest concern going forward with the active pattern
will be the possibility of rain on snow from the mountain ranges
to the Pine Ridge in NE. Depending on rates and intensity further
flooding concerns remain for rapid rises in area rivers and
streams besides the White River.

&&

.CYS WATCHES/WARNINGS/ADVISORIES...
WY...None.
NE...None.
&&

UPDATE...CW
SHORT TERM...WM
LONG TERM...WM
AVIATION...CW
FIRE WEATHER...WM
HYDROLOGY...WM

Hazardous Weather Outlook
National Weather Service Cheyenne WY
447 AM MDT Thu May 23 2019

NEZ003-019>021-054-055-095-096-WYZ101>119-241100-
Box Butte-Scotts Bluff-Banner-Morrill-Kimball-Cheyenne-
North Sioux-South Sioux-Converse County Lower Elevations-
Niobrara County-North Laramie Range-
Ferris/Seminoe/Shirley Mountains-Shirley Basin-
Central Laramie Range and Southwest Platte County-
East Platte County-Goshen County-Central Carbon County-
North Snowy Range Foothills-Southwest Carbon County-
Sierra Madre Range-Upper North Platte River Basin-Snowy Range-
Laramie Valley-South Laramie Range-South Laramie Range Foothills-
Central Laramie County-East Laramie County-
447 AM MDT Thu May 23 2019

This hazardous weather outlook is for portions of western
Nebraska...east central Wyoming...south central Wyoming and
southeast Wyoming.

.DAY ONE...TODAY AND TONIGHT

Scattered showers and isolated thunderstorms in the valleys with
light snow showers over the mountains possible. Storms should
remain non-severe. Area streams could be on the rise given ongoing
snowmelt and potential for rain on snow.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY

Scattered showers and isolated thunderstorms are possible mainly
over the weekend into early next week.

.Spotter information statement...

Spotter activation will not be needed.

NEZ002-241100-
Dawes-
447 AM MDT Thu May 23 2019

This hazardous weather outlook is for portions of western
Nebraska.

.DAY ONE...TODAY AND TONIGHT

Flood advisory continues for the White River from Whitney to the
SD/NE state line from recent snowmelt and rainfall event this
week. Please see flood advisory product for additional information.

Scattered showers and isolated thunderstorms possible. Storms
should remain non-severe. Area streams could be on the rise given
ongoing snowmelt and potential for rain on snow.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY

Scattered showers and isolated thunderstorms are possible mainly
over the weekend into early next week.

.Spotter information statement...

Spotter activation will not be needed.

Special Weather Statement
National Weather Service Cheyenne WY
1145 AM MDT Thu May 23 2019

WYZ116-232000-
South Laramie Range-
Including the cities of Buford, Pumpkin Vine, and Vedauwoo
1145 AM MDT Thu May 23 2019

Areas of fog, some of it dense, will be over the summit area east
of Laramie into early this afternoon. This includes Interstate 80
from roughly mile markers 321 to 340. Visibilities around one-
quarter mile have been noted in this are late this morning.

Motorists are advised to be prepared for these low visibilities
and slow down as needed.

Special Weather Statement
National Weather Service Cheyenne WY
1201 PM MDT Thu May 23 2019

WYZ110-232015-
North Snowy Range Foothills-
Including the cities of Arlington and Elk Mountain
1201 PM MDT Thu May 23 2019

Locally strong winds will affect the area into early this
afternoon. Sustained winds of 25 to 35 mph will occur in some
spots along Interstate 80 with local gusts over 50 mph,
especially from miles markers 250 to 255. The winds should ease
slowly this afternoon.

Motorists are advised to be prepared for the locally strong winds
and drive with extra caution.

Special Weather Statement
National Weather Service Cheyenne WY
1229 PM MDT Thu May 23 2019

WYZ110-115-232030-
North Snowy Range Foothills-Laramie Valley-
Including the cities of Arlington, Elk Mountain, Bosler,
and Laramie
1229 PM MDT Thu May 23 2019

Locally strong winds will affect the area into early this
afternoon. Sustained winds of 25 to 35 mph will occur in some
spots along Interstate 80 with local gusts over 50 mph,
especially near Laramie and from mile markers 250 to 255. The
winds should ease slowly this afternoon.

Motorists are advised to be prepared for the locally strong winds
and drive with extra caution.