Cascade Severe Watches & Warnings NOAA Weather Radio

Watches & Warnings

Winter Weather Advisory
Issued: 3:09 AM MDT Sep. 22, 2017 – National Weather Service

... Winter Weather Advisory remains in effect until midnight MDT
tonight for elevations above 4500 feet...

* locations: for portions of central Mt that are above 4500
feet... including MacDonald... Homestake and Kings Hill Pass.

* Timing: periods of snow are expected this morning above 4500
feet this morning... with a rain and snow mix below 4500 feet.
Snow above 4500 feet may then persist through today before
diminishing tonight.

* Accumulations: snow accumulation of 2 to 6 inches, with higher
amounts of 6 to 10 inches possible across the highest elevations.

* Winds: northeast 5 to 15 mph with gusts up to 30 mph.

* Visibilities: visibilities will be reduced to less than one mile
at times in falling and blowing snow.

* Snow level: 4500 feet.

* Impacts: the snow could create snow covered roads and mountain
passes... produce scattered power outages... and some minor tree
damage. Those with outdoor plans should prepare for the return
of winter conditions.

Precautionary/preparedness actions...

A Winter Weather Advisory for snow means that periods of snow
will cause primarily travel difficulties. Be prepared for snow
covered roads and limited visibilities, and use caution while
driving.





Special Statement
Issued: 6:34 AM MDT Sep. 22, 2017 – National Weather Service

... Rain and snow increasing over central Mt...

At 630 am, light rain and snow continue to increase over portions
of central Mt. The precipitation has been very light in the Helena
valley, but the intensity should increase during the rest of the
morning hours. Otherwise, a mix of rain and snow was falling along
the I-15 corridor from The Gates of the mountains northward to
Great Falls. The visibility was reduced to near two miles at times
in areas of falling snow. Any snow accumulations at lower
elevations will be confined to the grassy areas this morning. In
the mountains, new snowfall accumulations of an inch are two are
expected through late morning.



634 am MDT Fri Sep 22 2017

... Rain and snow increasing over central Mt...

At 630 am, light rain and snow continue to increase over portions
of central Mt. The precipitation has been very light in the Helena
valley, but the intensity should increase during the rest of the
morning hours. Otherwise, a mix of rain and snow was falling along
the I-15 corridor from The Gates of the mountains northward to
Great Falls. The visibility was reduced to near two miles at times
in areas of falling snow. Any snow accumulations at lower
elevations will be confined to the grassy areas this morning. In
the mountains, new snowfall accumulations of an inch are two are
expected through late morning.