Sun Valley, Idaho Weather Conditions

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Current Conditions

  • 32°
  • Snow
  • Wind: South 12 mph
  • Humidity: 69%
  • Visibility: N/A
  • Dew Point: 23°
  • Pressure: 30.01 in. -
  • Heat Index: 23

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Next 12 Hours

2  am
5  am
8  am
11  am
2  pm
Mostly Cloudy
Mostly Cloudy
Chance of Snow
Chance of Snow
Chance of Snow
Chance of Snow
Snow
Snow
Snow
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25°
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28°
30°
Forecast data from the National Digital Forecast Database.

5 Day Forecast

  • Friday
  • Snow
  • High: 30 °
  • Low: 19 °
  • Snow
  • Saturday
  • Snow
  • High: 30 °
  • Low: 28 °
  • Snow
  • Sunday
  • Snow
  • High: 37 °
  • Low: 30 °
  • Snow
  • Monday
  • Overcast
  • High: 37 °
  • Low: 19 °
  • Overcast
  • Tuesday
  • Mostly Cloudy
  • High: 34 °
  • Low: 19 °
  • Mostly Cloudy

Forecast for Sun Valley, Idaho

Updated: 2:00 AM MST on December 19, 2014

  • Friday

    Overcast with snow. High of 30F with a windchill as low as 19F. Winds from the SSW at 5 to 10 mph. Chance of snow 70% with accumulations up to 1 in. possible.

  • Friday Night

    Mostly cloudy with a chance of snow. Low of 19F. Winds less than 5 mph. Chance of snow 40%.

  • Saturday

    Mostly cloudy with a chance of snow in the morning, then overcast with snow. Fog early. High of 30F with a windchill as low as 16F. Winds from the SSW at 5 to 10 mph. Chance of snow 70%.

  • Saturday Night

    Overcast with snow. Fog overnight. Low of 28F with a windchill as low as 19F. Winds from the SW at 5 to 15 mph. Chance of snow 80% with accumulations up to 3 in. possible.

  • Sunday

    Overcast with snow, then snow and rain in the afternoon. High of 37F with a windchill as low as 19F. Winds from the WSW at 10 to 15 mph. Chance of snow 70%.

  • Sunday Night

    Overcast with a chance of rain. Low of 30F. Winds from the West at 5 to 10 mph. Chance of rain 60% with rainfall amounts near 0.2 in. possible.

  • Monday

    Overcast. High of 37F. Winds less than 5 mph.

  • Monday Night

    Overcast. Low of 19F. Winds less than 5 mph.

  • Tuesday

    Overcast in the morning, then mostly cloudy. Fog early. High of 34F with a windchill as low as 23F. Winds from the SW at 5 to 10 mph.

  • Tuesday Night

    Mostly cloudy. Fog overnight. Low of 19F with a windchill as low as 12F. Winds from the SSW at 5 to 10 mph.

  • Wednesday

    Overcast with a chance of snow. Fog early. High of 28F. Winds from the SSW at 10 to 15 mph. Chance of snow 50% with accumulations up to 2 in. possible.

  • Wednesday Night

    Overcast with a chance of snow. Low of 16F with a windchill as low as 7F. Winds from the NW at 5 to 10 mph. Chance of snow 70% with accumulations up to 4 in. possible.

  • Thursday

    Partly cloudy. Fog early. High of 23F. Winds from the NW at 5 to 10 mph.

  • Thursday Night

    Partly cloudy. Low of 7F. Winds less than 5 mph.

  • Friday

    Clear. High of 21F. Winds less than 5 mph.

  • Friday Night

    Partly cloudy. Fog overnight. Low of 0F. Winds less than 5 mph.

  • Saturday

    Partly cloudy. Fog early. High of 19F. Winds less than 5 mph.

  • Saturday Night

    Partly cloudy. Fog overnight. Low of 7F. Winds less than 5 mph.

  • Sunday

    Overcast with a chance of snow. Fog early. High of 16F. Winds less than 5 mph. Chance of snow 40% with accumulations up to 1 in. possible.

  • Sunday Night

    Mostly cloudy with a chance of snow. Fog overnight. Low of 5F. Winds less than 5 mph. Chance of snow 40% with accumulations up to 1 in. possible.

  • Monday

    Mostly cloudy with a chance of snow. Fog early. High of 16F. Winds less than 5 mph. Chance of snow 40% with accumulations up to 1 in. possible.

  • Monday Night

    Clear. Fog overnight. Low of 5F. Winds less than 5 mph.

Severe Weather Alert Descriptions

 Special Weather Statement  Statement as of 5:59 am MST on December 18, 2014


... Heavy snow possible in the mountains of southeast Idaho
Saturday through Monday...

A pattern of rather moist westerly winds off the Pacific is
expected to develop across southeast Idaho this weekend and may
bring some heavy snow accumulation to the mountain areas. There
is also potential for some strong winds over the mountains tops to
develop by Sunday that could create some hazardous blowing and
drifting conditions. This is a developing situation and
implications for the lower valleys and interstates is uncertain at
this time although rain is mainly expected in the Snake River Plain.
If you are planning on travel that will include mountain passes
this weekend... stay informed on the latest weather forecasts.





Personal Weather Stations

Personal Weather Stations [Add your weather station!]

Location: RAWS COPPER BASIN ID US, Mackay, ID

Updated: 12:50 AM MST

Temperature: 22 °F Dew Point: 16 °F Humidity: 79% Wind: SSW at 1 mph Pressure: - Hourly Precipitation: 0.00 in Windchill: 22 °F Graphs

Location: RAWS NORTH FORK ID US, Ketchum, ID

Updated: 12:39 AM MST

Temperature: 28 °F Dew Point: 28 °F Humidity: 99% Wind: Calm Pressure: - Hourly Precipitation: 0.00 in Windchill: 28 °F Graphs

Location: HADS KETCHUM RANGER STATION NEAR KETC ID US USBR, Ketchum, ID

Updated: 12:45 AM MST

Temperature: 29 °F Dew Point: - Humidity: - Wind: Calm Pressure: - Hourly Precipitation: 0.00 in Windchill: 29 °F Graphs

Location: Meadowbrook Road, Hailey, ID

Updated: 1:31 AM MST

Temperature: 30.6 °F Dew Point: 26 °F Humidity: 84% Wind: North at - Pressure: 30.12 in Hourly Precipitation: - Windchill: 31 °F Graphs

Location: MesoWest SUN VALLEY-BALD MTN (1 HOUR) ID US SNOWNET, Ketchum, ID

Updated: 1:00 AM MST

Temperature: 22 °F Dew Point: 21 °F Humidity: 95% Wind: SSW at 3 mph Pressure: 29.92 in Hourly Precipitation: 0.00 in Windchill: 22 °F Graphs

Location: East Fork, Hailey, ID

Updated: 1:35 AM MST

Temperature: 27.9 °F Dew Point: 26 °F Humidity: 93% Wind: Calm Pressure: 24.46 in Hourly Precipitation: 0.00 in Windchill: 28 °F Graphs

Location: HADS HAILEY RANGER STATION AT HAILEY ID US USBR, Hailey, ID

Updated: 12:45 AM MST

Temperature: 31 °F Dew Point: - Humidity: - Wind: Calm Pressure: - Hourly Precipitation: 0.00 in Windchill: 31 °F Graphs

Location: MesoWest Titus Study Plot ID US AVALANCHE, Ketchum, ID

Updated: 1:00 AM MST

Temperature: 19 °F Dew Point: - Humidity: - Wind: NNE at 1 mph Pressure: - Hourly Precipitation: 0.00 in Windchill: 19 °F Graphs

Location: MesoWest TITUS PEAK ID US SNOWNET, Ketchum, ID

Updated: 1:00 AM MST

Temperature: 18 °F Dew Point: 17 °F Humidity: 96% Wind: SSW at 5 mph Pressure: - Hourly Precipitation: 0.00 in Windchill: 11 °F Graphs

MSN Maps of:

Temp: Dew Point: Humidity Wind Pressure Hr Precip -

NWS Forecaster Discussion




Area forecast discussion 
National Weather Service Pocatello Idaho 
212 PM MST Thursday Dec 18 2014 


Short term...low pressure trough in the eastern Pacific and quick 
westerly winds keep sending little disturbances through this area. 
Disturbance just to our west should cross this area tonight with 
little precipitation...mostly the central mountains near Stanley 
and the eastern Highlands from Macks Inn to Palisades Reservoir. 
Good more clouds tonight should help limit fog 
formation...although some patchy fog will near rivers and streams 
and foothills where clouds meet terrain. A second and stronger 
disturbance comes in Friday...timing is a little slower favoring 
Friday afternoon and night. Snow accumulation in the mountains of 
1 to 4 inches with an inch or less in the snake plain. 


Moist westerly flow off the Pacific begins to set up Saturday and 
continue into Sunday/Monday. On the one hand...models suggest a 
foot or more of snow possible in the central mountains and eastern 
Highlands. At the same time...westerly winds begin to modify the 
air warmer...raising snow levels to 7000-8000 feet elevation on 
Sunday. The warm over running air could bring a little freezing 
rain/drizzle to places like Willow Creek or Gilmore Summit on 
Sunday where valley temperatures might yet remain below freezing. 
The GFS also tries to bring in stronger winds at mountain top on 
Sunday. That could bring blowing snow at ski resort areas or even 
some unstable snow build up areas. On the plus side...travel may 
not be bad with more rain than snow in the valleys. Receiver station 


Long term...Sunday night through Christmas night. Active weather 
pattern will continue through Monday with a significant amount of 
mountain snow. Snow levels will be generally 6500 to 7500 feet Monday 
morning...but will be dropping Monday night. GFS shows significant 
ivt signifying atmospheric river penetrating through the Columbia 
River valley into the snake plain Sunday night into Monday. By 
Monday night...the moisture transport weakens as a broad upper ridge 
builds briefly into the Pacific northwest. Total snowfall amounts for the 
duration of the atmospheric river event will likely be very light in 
the snake plain...up to two inches...but will be much heavier in the 
central mountains and the eastern Highlands. The Sawtooth range as 
well as the Idaho Wasatch/Caribou Highlands could see 18 to 24 
inches. Focus then shifts to the upper disturbance that will move 
into the Pacific northwest from the Gulf of Alaska on Christmas evening. 
Operational GFS and European model (ecmwf) have varied somewhat between a cutoff low 
developing over the eastern Great Basin and a modest upper trough 
embedded in the northwesterly flow. Took a peek at the parallel GFS 
as well...which presents a deeper trough scenario over the Great 
Salt Lake and nearly cuts off a low circulation. It is a little 
early to place any confidence in either model yet...but will monitor 
the trends through the weekend to see if a consensus can be made on 
a solution. Both GFS and European model (ecmwf) are bringing cooler air along with 
the system so have adjusted maximum/min temperatures accordingly. Hinsberger 


&& 


Aviation...VFR conditions exist over the snake plain...and should 
continue through the afternoon. Ksun is experiencing 2000 feet 
ceilings with signs of some snowfall approaching from the enhanced 
infrared imagery. A switch to up-valley winds later this afternoon may 
result in ceilings dropping below airfield minimums. Models 
suggesting the same...though NAM MOS favors the greater chance for 
some light snowfall today. Hinsberger 


&& 


Pih watches/warnings/advisories...none. 


&& 


$$ 














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