Yellowstone National Park Severe Watches & Warnings NOAA Weather Radio

Watches & Warnings

Winter Weather Advisory
Issued: 1:07 PM MDT Sep. 21, 2017 – National Weather Service

... Winter Weather Advisory remains in effect until 6 PM MDT
Friday...

* timing... periods of snow will impact much of Yellowstone
National Park through the day Friday. The lowest elevations
could be mixture of rain and snow at times.

* New snowfall... 4 to 8 inches in the mountains and at pass level
with 1 to 4 inches across the lower elevations. The least being
around Mammoth.

* Main impact... mountain passes in Yellowstone will be slick and
hazardous at times, especially tonight and Friday morning.

Precautionary/preparedness actions...

A Winter Weather Advisory for snow means periods of snow will
cause primarily travel difficulties. Be prepared for snow covered
and slick roads with limited visibilities. Slow down, and allow
extra time to reach your destination. Check the latest Road
conditions before venturing out.





Special Statement
Issued: 1:17 AM MDT Sep. 21, 2017 – National Weather Service

... Cool and very wet Pacific storm system headed into western
Wyoming today...

The strong Pacific storm headed towards western Wyoming will
continue to bring copious amounts of precipitation with it.
However, temperatures with this Pacific air mass will be much
warmer than originally thought, keeping snow accumulation levels
very high... at or above 10000 feet through tonight... with only
slight chances for snow mixing with rain below this level. That
said, anywhere from a half an inch and two inches of liquid
precipitation can be expected to fall between now and Friday
morning across the western mountains and valleys. Heaviest
accumulating snow over the same time frame will range from 3 to 8
inches above 10000 feet... with locally higher amounts possible.


117 am MDT Thu Sep 21 2017

... Cool and very wet Pacific storm system headed into western
Wyoming today...

The strong Pacific storm headed towards western Wyoming will
continue to bring copious amounts of precipitation with it.
However, temperatures with this Pacific air mass will be much
warmer than originally thought, keeping snow accumulation levels
very high... at or above 10000 feet through tonight... with only
slight chances for snow mixing with rain below this level. That
said, anywhere from a half an inch and two inches of liquid
precipitation can be expected to fall between now and Friday
morning across the western mountains and valleys. Heaviest
accumulating snow over the same time frame will range from 3 to 8
inches above 10000 feet... with locally higher amounts possible.



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