Saturday, March 25, 2017

Flood Advisory Star Valley until Sunday AM

Flood Advisory
National Weather Service Riverton WY
852 AM MDT SAT MAR 25 2017


Lincoln-
852 AM MDT SAT MAR 25 2017

The National Weather Service in Riverton has issued a

* Urban and Small Stream Flood Advisory for Poor Drainage Areas
  for...
  Rain and Snowmelt in...
  Northwestern Lincoln County in west central Wyoming...

* Until 845 AM MDT Sunday

* Emergency management reported continued flooding of the Bear River
  upstream and downstream of Cokeville.  Mainly agricultural land is
  flooding.  The Bear River at Cokeville is fluctuating around
  bankfull and is forecast to slowly recede below bankfull by Sunday
  morning. Upstream releases out of Woodruff Narrows Reservoir have
  decreased.

* Flooding in Star Valley continues with Crow Creek and the Salt
  River inundating mainly agricultural land. Flood waters have
  stayed away from homes in Fairview due to continued sandbagging.
  Crow Creek near Fairview crested Thursday morning and is expected
  remain near flood stage through Sunday morning. The Salt River
  near Etna crested Thursday afternoon just below bankfull and is
  expected to continue to fluctuate near bankfull through Sunday
  morning.

* Overflowing poor drainage areas will also continue in minor
  flooding.

* This advisory has replaced the previous war

Thursday, March 23, 2017

A FLOOD WARNING FOR URBAN AREAS AND SMALL STREAMS FOR RAIN AND SNOWMELT REMAINS IN EFFECT UNTIL 830 AM MDT FRIDAY FOR LINCOLN COUNTY.

Flood Statement
National Weather Service Riverton WY
256 PM MDT THU MAR 23 2017


256 PM MDT THU MAR 23 2017

...A FLOOD WARNING FOR URBAN AREAS AND SMALL STREAMS FOR RAIN AND
SNOWMELT REMAINS IN EFFECT UNTIL 830 AM MDT FRIDAY FOR LINCOLN
COUNTY...

At 228 PM MDT, emergency management reported that the Bear River is
flooding agricultural land in many locations near Cokeville.
Unanticipated upstream reservoir releases from Woodruff Narrows
Reservoir may cause the Bear River to continue to rise through
Friday.

Crow Creek near Fairview is cresting at this time. The creek was
reported by spotters as encroaching several secondary roads.  Homes
are still not being affected near Fairview due to continued
sandbagging. Emergency management reported that the Salt River is
flowing out of its banks around Auborn and Thayne. The Salt River
near Etna is forecasted to crest near bankfull stage of 5.0 feet by
early Friday morning.

Colder and drier weather tonight through Friday will slow down the
amount of snowmelt runoff across the Bear and Salt River valleys.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don`t drown when encountering flooded roads. Most flood
deaths occur in vehicles.

Please report flooding to your local law enforcement agency when you
can do so safely.

Rainfall Totals for the past 24 hours ending at 6 PM MDT Thursday

Public Information Statement
National Weather Service Riverton WY
640 PM MDT Thu Mar 23 2017

Here are Rainfall Totals for the past 24 hours ending
at 6 PM MDT Thursday.

Location                     Amount
...Lincoln County...
5 SSE La Barge               1.75 in
Kemmerer                     0.76 in
5 SSE Smoot                  0.72 in
1 NW Afton                   0.28 in
2 SE Thayne                  0.28 in
Cokeville                    0.25 in
Afton                        0.25 in
Bedford - Coop               0.23 in
Afton - Coop                 0.22 in
Smiths Fork Near Border      0.22 in
15 NE Cokeville              0.22 in
Thayne                       0.20 in
5 NNE Thayne                 0.18 in
Star Valley Ranch            0.12 in
4 NE Thayne                  0.11 in
Etna                         0.02 in
3 NW Etna                    0.01 in
...Big Horn County... 5 ENE Hyattville 0.35 in Basin 0.18 in 15 E Lovell 0.15 in Basin 0.14 in 30 E Greybull 0.08 in 11 ESE Lovell 0.05 in 9 NNW Shell 0.05 in Lovell 0.04 in Greybull 0.02 in 4 E Otto 0.02 in ...Fremont County... N. Fork Little Wind River 1.23 in Middle Fork Popo Agie River 1.22 in 11 SSE Lander 0.96 in N Fork Popo Agie River 0.84 in 3 NNW Hudson 0.79 in Fort Washakie 0.73 in 9 SW Lander 0.71 in 7 NW Lander 0.68 in Atlantic City - Coop 0.61 in Boysen Reservoir 0.47 in Jeffrey City 0.45 in 7 SW Muddy Gap 0.43 in 3 NNE South Pass City 0.40 in 6 NW Dubois 0.34 in 11 W Crowheart 0.30 in 8 W South Pass City 0.29 in Crowheart 0.27 in Jeffrey City 0.27 in 10 W Dubois 0.24 in 10 SE Crowheart 0.23 in 19 WSW Dubois 0.18 in 10 N Dubois 0.16 in Boysen Dam 0.16 in ...Hot Springs County... Thermopolis 1.24 in Kirby 0.48 in 10 S Meeteetse 0.13 in S. Fork Owl Creek Below Anch 0.13 in ...Johnson County... 7 WSW Buffalo 1.05 in 2 NW Mayoworth 0.64 in 7 NW Mayoworth 0.59 in Kaycee 0.55 in 7 NE Buffalo 0.52 in 7 SW Barnum 0.51 in 15 ESE Buffalo 0.50 in 10 SW Kaycee 0.43 in 8 S Story 0.42 in Kaycee 17 NNW 0.42 in 3 SSE Barnum 0.34 in 14 W Buffalo 0.27 in 18 NW Buffalo 0.26 in 17 E Kaycee 0.26 in 20 NW Mayoworth 0.25 in ...Natrona County... 12 NE Lysite 0.44 in Powder River 0.16 in Midwest 0.13 in 8 SE Evansville 0.07 in 3 WSW Mills 0.06 in Casper - N Platte River 0.04 in 8 S Casper 0.01 in Independence Rock 0.01 in 11 WSW Casper 0.01 in ...Park County... Meeteetse 0.20 in Mammoth 0.19 in 20 SW Cody 0.13 in 3 E Pahaska 0.06 in Hoyt Peak 0.02 in 3 E Wapiti 0.02 in 2 W Pitchfork 0.02 in 1 SW Canyon 0.01 in 10 WNW Cody 0.01 in Tower Falls 0.01 in 14 S Sylvan Pass 0.01 in ...Sublette County... Pinedale 0.56 in 14 N Farson 0.47 in 7 NE Pinedale 0.44 in 21 W Big Piney 0.28 in Boulder Rearing Station - Co 0.28 in Boulder Lake 0.24 in Daniel Fish Hatchery - Coop 0.24 in 14 NW Pinedale 0.24 in Bondurant 0.17 in 2 NW Bondurant 0.15 in ...Sweetwater County... 3 NE Manila Ut 1.04 in Flaming Gorge - Buckboard Ma 0.69 in 7 SE Rock Springs 0.64 in 15 SE Rock Springs 0.63 in Green River 0.50 in 4 NNW Rock Springs 0.49 in Mckinnon 0.48 in Rock Springs 0.45 in Green River 0.43 in 1 S Fontenelle Reservoir 0.40 in Farson 0.37 in 4 NE Bitter Creek 0.17 in ...Teton County... 2 NE Teton Village 0.16 in 5 S Of South Entrance Ynp 0.13 in 3 SSW Wilson 0.13 in 12 NE Jackson 0.08 in 4 W South Entrance Ynp 0.07 in Hoback Junction 0.06 in 4 N Moose 0.06 in Moran 0.06 in Snake River Ranger Station 0.06 in Moose - Coop 0.05 in Alta 0.04 in South Entrance Ynp 0.04 in Moran Junction 0.02 in Jackson - Coop 0.02 in 3 SSW Jackson 0.01 in 2 NE Wilson 0.01 in Kelly 0.01 in Lake Village 0.01 in ...Washakie County... 1 SE Ten Sleep 1.32 in 10 SSE Worland 0.81 in 15 SSW Big Trails 0.77 in Ten Sleep 0.55 in Worland 0.45 in 16 SE Big Trails 0.32 in 27 S Ten Sleep 0.30 in 12 ENE Ten Sleep 0.29 in Tensleep 0.17 in

Tuesday, March 21, 2017

Snow Melt Flood Potential Moderate to High Salt River Drainage

2017 Wyoming Spring Snowmelt Flood Potential Outlook---updated March 21st


Mountain snowpack and associated snow water equivalents (SWEs) across central through western Wyoming continued to be much above average by the middle of March; while SWEs across basins in southeastern Wyoming were generally above average.   SWEs at the peak snowmelt runoff elevations (8,500’ – 10.000’) were the highest across the Wind and the Upper Green Basins at 170 to 180 percent of median.  The Tongue and Powder River Drainages had SWEs at 85 to near 100 percent of median at the peak snowmelt runoff elevations.
This outlook is based on various diverse hydrological factors such as:  snow water equivalents (SWEs) in the mountain snowpack, basin morphology (i.e. how basins respond to snowmelt runoff),  antecedent soil moisture, amount of forest canopy damage, recent burn scars, low elevation snow depths, and likely temperature and precipitation trends during late spring/early summer. 


HIGHLIGHTS:

 

Moderate to High potential for flooding associated with snowmelt is expected over several basins across the Little and Big Wind Watersheds… 
Moderate to High potential for flooding associated with snowmelt is expected over several headwater basins of the Upper Green Basin…
Moderate to High potential for snowmelt flooding is expected over headwater basins of the Snake River Basin (to include the Salt River Drainage)…
Moderate to High potential for snowmelt flooding is expected over portions of the North and South Forks of the Shoshone River Basin…
Moderate potential for flooding associated with snowmelt is also expected across the upper to middle portions the of the Little and Big Wind Watersheds, the middle to upper portions of the Upper Green Drainage, the lower and/or upper potions of the North/South Forks of the Shoshone Basin, the upper and lower sections of the Upper Bear Watershed, and several basins across the Snake River Watershed...
…All other headwater basins across Wyoming can expect a generally Low potential for flooding due to springtime snowmelt...
The next outlook will be issued by the 20th of April. 

Cottonwood SNOTEL March 21 2017


Willow Creek SNOTEL March 21 2017

Monday, March 20, 2017

Flash Flood Watch through Tuesday



Flood Watch
National Weather Service Riverton WY
150 PM MDT Mon Mar 20 2017

...Significant low elevation snowmelt through Tuesday afternoon
will cause flooding in the western valleys...

.Isolated showers are forecasted this afternoon and early evening
over the Upper Green and western valleys. Precipitation amounts
will be one to two tenths of an inch. Afternoon temperatures
today and Tuesday will be in the middle 40s to middle 50s. The
expected rain and temperatures will keep the potential for more
significant snowmelt through Tuesday afternoon.

.The Salt River near Etna is running about a foot from bankfull(see image above) on
Monday afternoon. The river is expected to continue to slowly
rise on Tuesday but remaining below bankfull stage.


Jackson Hole-Star Valley-Upper Green River Basin Foothills-
Upper Green River Basin-South Lincoln County-
Including the cities of Jackson, Afton, Alpine,
Star Valley Ranch, Thayne, Pinedale, La Barge, Big Piney, Farson,
Kemmerer, and Cokeville
150 PM MDT Mon Mar 20 2017

...FLOOD WATCH NOW IN EFFECT THROUGH TUESDAY AFTERNOON...

The Flood Watch is now in effect for

* Portions of northwest Wyoming, southwest Wyoming, and west
  central Wyoming, including the following areas, in northwest
  Wyoming, Jackson Hole. In southwest Wyoming, South Lincoln
  County. In west central Wyoming, Star Valley, Upper Green
  River Basin, and Upper Green River Basin Foothills.

* Through Tuesday afternoon

* The warmer valley temperatures and forecasted rain on a ripe and
  melting snowpack will cause significant low elevation snowmelt
  runoff.

* Flooding of smaller streams, culverts, and other low lying areas
  will remain a distinct possibility through Tuesday afternoon.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Flood Watch means there is a potential for flooding based on
current forecasts.

People living in flood prone areas across the western valleys
and across the Upper Green Basin should begin preparing for
rising water across low lying areas such as drainage ditches,
bridges, and basements. You should monitor later forecasts and be
alert for possible Flood Warnings.

Sunday, March 19, 2017

Flood Watch Tonight Star Valley

Flood Watch
National Weather Service Riverton WY
125 PM MDT Sun Mar 19 2017

...Significant low elevation snowmelt through tonight will cause
flooding in the western valleys...

.Recent rainfall along with temperatures in the 40s and 50s
across Jackson Hole and Star Valley today combined with southerly
winds of 15 to 25 mph will keep the potential for more
significant snowmelt through tonight.


Jackson Hole-Star Valley-South Lincoln County-
Including the cities of Jackson, Afton, Alpine,
Star Valley Ranch, Thayne, Kemmerer, and Cokeville
125 PM MDT Sun Mar 19 2017

...FLOOD WATCH REMAINS IN EFFECT THROUGH LATE TONIGHT...

The Flood Watch continues for

* Portions of northwest Wyoming, southwest Wyoming, and west
  central Wyoming, including the following areas, in northwest
  Wyoming, Jackson Hole. In southwest Wyoming, South Lincoln
  County. In west central Wyoming, Star Valley.

* Through late tonight

* The warmer valley temperatures, southerly winds, and recent rain
  on a ripe and melting snowpack will cause significant low
  elevation snowmelt runoff.

* Flooding of smaller streams, culverts, and other low lying areas
  will remain a distinct possibility through tonight.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Flood Watch means there is a potential for flooding based on
current forecasts.

People living in flood prone areas across the western valleys
should begin preparing for rising water across low lying areas
such as drainage ditches, bridges, and basements. You should
monitor later forecasts and be alert for possible Flood Warnings.

&&

Friday, March 17, 2017

Weekend Flood Watch Star Valley along with Western Wyoming Valleys Through Sunday Night

Flood Watch
National Weather Service Riverton WY
211 AM MDT Sat Mar 18 2017

...Significant low elevation snowmelt today through Sunday night
will cause flooding in the western valleys...

.Temperatures in the 50s are expected across Jackson Hole and
Star Valley on Saturday. Low temperatures on Sunday are forecasted
to be in the middle 30s to near 40 degrees. Strong southerly
winds at 15 to 30 mph are also expected across the western valleys
Saturday afternoon through early Sunday morning. Expect rain in
the western valleys to start later night and last through Sunday
afternoon.

Jackson Hole-Star Valley-South Lincoln County-
Including the cities of Jackson, Afton, Alpine,
Star Valley Ranch, Thayne, Kemmerer, and Cokeville
211 AM MDT Sat Mar 18 2017

...FLOOD WATCH NOW IN EFFECT FROM NOON MDT TODAY THROUGH LATE
SUNDAY NIGHT...

The Flood Watch is now in effect for

* Portions of northwest Wyoming, southwest Wyoming, and west
  central Wyoming, including the following areas, in northwest
  Wyoming, Jackson Hole. In southwest Wyoming, South Lincoln
  County. In west central Wyoming, Star Valley.

* From noon MDT today through late Sunday night

* The warmer valley temperatures, strong southerly winds, and
  rain on a ripe and melting snowpack forecasted for the weekend
  will cause significant low elevation snowmelt runoff.

* Flooding of smaller streams, culverts, and other low lying
  areas is expected to be the greatest by Sunday afternoon as
  snowmelt runoff will be peaking at that time.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Flood Watch means there is a potential for flooding based on
current forecasts.

People living in flood prone areas across the western valleys
should begin preparing for rising water across low lying areas
such as drainage ditches, bridges, and basements. You should
monitor later forecasts and be alert for possible Flood Warnings.