Flash Flood Watch 9, NWS Cheyenne, WY

902 
WGUS65 KCYS 262203
FFACYS

Flood Watch
National Weather Service Cheyenne WY
403 PM MDT Thu Jul 26 2018

...FLASH FLOOD WATCH IN EFFECT FOR THIS AFTERNOON AND EVENING...

NEZ003-019>021-054-055-096-WYZ108-118-119-270400-
/O.CON.KCYS.FF.A.0009.000000T0000Z-180727T0400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Box Butte-Scotts Bluff-Banner-Morrill-Kimball-Cheyenne-
South Sioux-Goshen County-Central Laramie County-
East Laramie County-
Including the cities of Alliance, Scottsbluff, Gering, 
Harrisburg, Angora, Bridgeport, Bayard, Redington, Kimball, 
Brownson, Sidney, Agate, Torrington, Cheyenne, and Pine Bluffs
403 PM MDT Thu Jul 26 2018

...FLASH FLOOD WATCH REMAINS IN EFFECT UNTIL 10 PM MDT THIS
EVENING...

The Flash Flood Watch continues for

* Portions of western Nebraska and southeast Wyoming, including 
  the following areas, in western Nebraska, Banner, Box Butte, 
  Cheyenne, Kimball, Morrill, Scotts Bluff, and South Sioux. In 
  southeast Wyoming, Central Laramie County, East Laramie 
  County, and Goshen County. 

* Until 10 PM MDT this evening

* Thunderstorms capable of producing very heavy rainfall are 
  forecast to develop this afternoon through this evening. 
  Training thunderstorms are possible over some areas of the 
  watched area that could lead to flash flooding. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Flash Flood Watch means that conditions may develop that lead
to flash flooding. Flash flooding is a very dangerous situation.

You should monitor later forecasts and be prepared to take action
should Flash Flood Warnings be issued.

&&

$$

089 
WGUS65 KCYS 270202
FFACYS

Flood Watch
National Weather Service Cheyenne WY
802 PM MDT Thu Jul 26 2018

NEZ003-019>021-054-055-096-WYZ108-118-119-270315-
/O.CAN.KCYS.FF.A.0009.000000T0000Z-180727T0400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Box Butte-Scotts Bluff-Banner-Morrill-Kimball-Cheyenne-
South Sioux-Goshen County-Central Laramie County-
East Laramie County-
Including the cities of Alliance, Scottsbluff, Gering, 
Harrisburg, Angora, Bridgeport, Bayard, Redington, Kimball, 
Brownson, Sidney, Agate, Torrington, Cheyenne, and Pine Bluffs
802 PM MDT Thu Jul 26 2018

...FLASH FLOOD WATCH IS CANCELLED...

The Flash Flood Watch for portions of western Nebraska and
southeast Wyoming has been cancelled. Most of the heavy rainfall
has ended across the area with a few brief heavy rain showers
still moving southeast across the southern Nebraska panhandle
through late this evening. Expect this activity to diminish
shortly. 

$$

Area Forecast Discussion
National Weather Service Cheyenne WY
552 AM MDT Thu Jul 26 2018

.SHORT TERM...(Today through Friday night)
Issued at 307 AM MDT Thu Jul 26 2018

Little change seen in the overall weather pattern over the CWA
through Friday with the area remaining under decent northwesterly
flow aloft atop modest surface upslope flow. Expect at least sctd
showers and storms to develop in the vicinity of the mtns again
this afternoon and progress over the plains through the evening
hours. A few strong to severe storms possible with shear values a
bit higher over the plains today. SPC showing much of the CWA with
a Marginal risk today. Storms should move fairly fast so the
threat for flash flooding looks low overall though localized
instances are possible. Same scenario overall Friday though storms
may be somewhat more concentrated up north closer to a shortwave
moving into the northern plains. Activity may be aided by a
surface front that will edge east into the high plains Friday
before the next push of cooler air moves in Friday night.

.LONG TERM...(Saturday through Wednesday)
Issued at 307 AM MDT Thu Jul 26 2018

The wet and unsettled conditions will remain over the area
Saturday through Sunday with a pretty good push of cool air for
late July arriving Sunday. Scattered to numerous showers and
storms will continue both days. Drying should then ensue late
Sunday in the wake of a stronger shortwave that will move south
from the northern plains and cut off the monsoonal moisture for a
time. Monday through Weds should see warming temperatures back to
near seasonal averages along with mainly dry conditions under a
persistent northwesterly flow aloft.

&&

.AVIATION...(For the 12Z TAFS through 12Z Friday morning)
Issued at 540 AM MDT Thu Jul 26 2018

The main concerns today will be the thunderstorm chances. Latest
water vapor loop was showing a shortwave moving through southeast
Montana. This feature may trigger a few thunderstorms late this
morning in northeast Wyoming. However, the main activity is
expected to develop mainly after 21z this afternoon as stronger
jet energy crosses over the Laramie Range. This will create
scattered strong to severe thunderstorms. These storms will
generally move southeast around 25kts, but a few of these storms
could deviate and split. These storms may contain strong wind
gusts and hail up to quarter size. The thunderstorms should move
out of the Nebraska panhandle by 03-04z with clearing skies
expected overnight. Not confident about seeing low clouds or fog
at this juncture.

&&

.FIRE WEATHER...
Issued at 307 AM MDT Thu Jul 26 2018

Fire weather concerns should be quite low through the weekend with
several disturbances combining with monsoonal moisture to produce
scattered to numerous showers and thunderstorms over much of the
area especially in the afternoons and evenings. Temperatures will
be mild through the weekend. Warmer and drier weather should
return early next week.

&&

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

SHORT TERM...RE
LONG TERM...RE
AVIATION...REC
FIRE WEATHER...RE

Hazardous Weather Outlook
National Weather Service Cheyenne WY
338 AM MDT Thu Jul 26 2018

NEZ002-003-019>021-054-055-095-096-WYZ101>103-105>108-115>119-
271000-
Dawes-Box Butte-Scotts Bluff-Banner-Morrill-Kimball-Cheyenne-
North Sioux-South Sioux-Converse County Lower Elevations-
Niobrara County-North Laramie Range-Shirley Basin-
Central Laramie Range and Southwest Platte County-
East Platte County-Goshen County-Laramie Valley-
South Laramie Range-South Laramie Range Foothills-
Central Laramie County-East Laramie County-
338 AM MDT Thu Jul 26 2018

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 to numerous showers and thunderstorms are expected to
initially develop around the mountains early this afternoon then
move out over the plains through this evening. A few strong to
severe storms are possible with hail and gusty winds the main
threat.  Locally heavy rain is also possible.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY

Scattered showers and storms will continue to be likely through
Sunday. Some strong storms remain possible Friday and Saturday.

.Spotter information statement...

Spotter activation is not expected at this time.

WYZ104-109>114-271000-
Ferris/Seminoe/Shirley Mountains-Central Carbon County-
North Snowy Range Foothills-Southwest Carbon County-
Sierra Madre Range-Upper North Platte River Basin-Snowy Range-
338 AM MDT Thu Jul 26 2018

This hazardous weather outlook is for portions of south central
Wyoming.

.DAY ONE...TODAY AND TONIGHT

Widely scattered showers and storms should move across the area
this afternoon into early this evening. Severe storms are not
expected.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY

Widely scattered showers and storms will continue to be likely
through Sunday.

.Spotter information statement...

Spotter activation will not be needed.