Preliminary Snow Totals

Preliminary Snow Totals

Snow began to fall out west in the early Saturday morning hours before spreading east of the Divide. Below are the earliest snow reports, with most reported by 8 AM. The list will be updated as more reports come in. Location Snowfall Big Horn County… 9 NNW Shell… 0.7 inches. Fremont County… Atlantic City… 2 inches. 6 SW Lander… 0.1 inches. Hot Springs County… Johnson County… 13 SSE Buffalo… 1 inch. 7 NE Buffalo… 0.5 inches. Buffalo… 0.4 inches. 17…

Read More Read More

How Much Longer Before Return to Winter in Star Valley?

How Much Longer Before Return to Winter in Star Valley?

Clear skies, light winds and seasonably cool weather persisted through the weekend across Star Valley and surrounding area as an unusually strong and persistent high pressure dominates the Western States.  This high is blocking Pacific storm systems from moving into the U.S.  Instead storms are forced far to the north across Western Canada and then plunging southeastward into the eastern States.  Animation of the water vapor imagery over the weekend clearly depicts this pattern.     This pattern of High…

Read More Read More

Coldest Temperatures of the Season Star Valley-December 7 2017

Coldest Temperatures of the Season Star Valley-December 7 2017

Under clear skies and with fresh snow cover, temperatures dropped to some of the lowest levels so far this season.  Single digits were common across Star Valley with the lowest observed occurring a Double L Ranch where it dipped to Zero followed close behind at Smoot with a 1 above.  Coldest observed in the area was in Grey’s River at the Box Y Ranch with 5 below. Here is a map of the low temperatures across the region Minimum temperatures…

Read More Read More

SNOTEL’s What, Why and How

SNOTEL’s What, Why and How

  Introduction The Natural Resources Conservation Service (NRCS) installs, operates, and maintains an extensive, automated system to collect snowpack and related climatic data in the Western United States called SNOTEL (for SNOwpack TELemetry). The system evolved from NRCS’s Congressional mandate in the mid-1930’s “to measure snowpack in the mountains of the West and forecast the water supply.” The programs began with manual measurements of snow courses; since 1980, SNOTEL has reliably and efficiently collected the data needed to produce water…

Read More Read More

Storm Summary for December 4 2017

Storm Summary for December 4 2017

Clearing Skies in Star Valley Public Information Statement National Weather Service Riverton WY 225 PM MST Mon Dec 04 2017 …Preliminary Storm Information… The snowfall started off lightly Sunday evening, and then increased through the late night hours. The winter storm has now exited the region leaving snowfall amounts from just a trace to up to 15 inches. Here are the updated amounts through 2 pm Monday. Observations are collected from a variety of sources with varying equipment and exposures….

Read More Read More

High Pressure Ridge to Dominate Western Weather well into December- Mild and Dry

High Pressure Ridge to Dominate Western Weather well into December- Mild and Dry

Once the current weather system departs Wyoming by late Monday an unseasonably large and persistent  high pressure ridge develops along the West Coast. By the end of the week the ridge will extend all the way north to Alaska, steering storms well to the north of a normal track for December . This model forecast above  is for noon Friday. Very cool/cold air will drop southward from Northern Canada into the eastern half of the U.S. where the deep low…

Read More Read More

Winter Weather Advisory Star Valley-Winter Storm Warning in Mountains

Winter Weather Advisory Star Valley-Winter Storm Warning in Mountains

Weather Service Riverton WY 139 PM MST Sat Dec 2 2017 …Winter storm for mountains of Western Wyoming tonight through Sunday night… Winter storm watch for parts of Central Wyoming Sunday night and Monday Morning… .Snow will spread south and east from the northwest mountains this evening. Snow, possibly heavy at times, will continue Sunday and into Sunday night over the western mountains. The snow will be accompanied by periods of gusty wind. Areas of blowing and drifting snow will…

Read More Read More

Winter Storm Watch Star Valley Late Saturday and Sunday

Winter Storm Watch Star Valley Late Saturday and Sunday

Forecast Snowfall through Monday Afternoon National Weather Service Riverton WY 101 PM MST Fri Dec 1 2017 …Significant snowstorm expected for parts of Western Wyoming later Saturday night through Sunday night and over into parts of Central Wyoming Sunday night and Monday Morning… .A cold storm system over the southern Gulf of Alaska will dive southeast towards the area this weekend. Snow is expected to become widespread across the northwest mountains Saturday evening and then spread southeast across the area….

Read More Read More

Fall Weather Summary for Star Valley

Fall Weather Summary for Star Valley

The fall months of September, October and November were both wetter and somewhat warmer than normal. Following are the totals of rain, snow and maximum and minimum temperatures from observation stations around Star Valley for the 3 month period.   Fall Precipitation  inches …………………………..September            October                   November        Fall Totals Station                               …

Read More Read More

Example of Computer Models Difficulty in Forecasting 10 Days in Advance

Example of Computer Models Difficulty in Forecasting 10 Days in Advance

Weather forecasts have become quite accurate in the near term given the increasingly sophisticated computer models that provide the primary guidance.  However the usefulness of forecast diminishes the further out in time the forecast is made as the models steadily decrease in accuracy. Also models are the primary guidance that is used beyond the first couple of days, and almost exclusively beyond 5-7 days. It is instructive to examine a series of forecasts made by the same model(GFS) for the…

Read More Read More