Winter Weather Warnings / Watches / Advisories
Issued by NWS Pocatello, ID

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495
WWUS45 KPIH 191932
WSWPIH

URGENT - WINTER WEATHER MESSAGE
National Weather Service Pocatello ID
1232 PM MST Mon Feb 19 2018

...Arctic air generating bone chilling cold and some snow...

.Arctic air has spilled over the continental divide from southwest
Montana. The air is extremely cold, with single digit overnight
lows expected as far south and west as the eastern Magic Valley.
Widespread areas of Clark and Fremont counties will also have
enough wind to plunge Effective Chill Temperatures (Windchill)
below minus twenty degrees Fahrenheit. In addition, the cold air
will act as a small cold front once it reaches the American Falls
Reservoir. It will spread light to moderate snow from areas west
of Pocatello all the way to Burley tonight.

IDZ019-201200-
/O.NEW.KPIH.WC.W.0001.180220T0100Z-180220T1700Z/
Upper Snake Highlands-
Including the cities of St. Anthony, Ashton, Driggs, and Victor
1232 PM MST Mon Feb 19 2018

...WIND CHILL WARNING IN EFFECT FROM 6 PM THIS EVENING TO 10 AM
MST TUESDAY...

* WHAT...Dangerously cold wind chills will cause frostbite in as
  little as 10 minutes to exposed skin. Expect wind chills to
  range from 20 below zero to 35 below zero.

* WHERE...The upper Snake Highlands, including Clark and Fremont
  counties in Idaho, including the towns of Macks Inn, Island
  Park, Dubois, and Spencer.

* WHEN...From 6 PM this evening to 10 AM MST Tuesday. At first,
  elevations at or above 7000 ft will be affected, then by
  midnight this should spread down in elevation until nearly all
  of Clark and most of Fremont counties are affected.

* ADDITIONAL DETAILS...The windchill is caused by air temperatures
  below zero combining with wind of 10 to 15 mph.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Wind Chill Warning means the combination of very cold air and
the wind will create dangerously low wind chill values. Frost
bite can occur quickly and even hypothermia or death if
precautions are not taken.

$$

IDZ017-021-022-201200-
/O.NEW.KPIH.WW.Y.0011.180220T0100Z-180220T1200Z/
Eastern Magic Valley-Lower Snake River Plain-
South Central Highlands-
Including the cities of Burley, Rupert, Heyburn, and Pocatello
1232 PM MST Mon Feb 19 2018

...WINTER WEATHER ADVISORY IN EFFECT FROM 6 PM THIS EVENING TO
5 AM MST TUESDAY...

* WHAT...Snow expected. Plan on slippery road conditions,
  including during the evening commute. Total snow accumulations
  of up to two inches, with localized amounts up to 4 inches,
  are expected.

* WHERE...The lower Snake River plain, from areas west of
  Pocatello through the eastern Magic Valley to the Burley area.
  The heaviest snowfall is expected from American Falls to the
  Cold Water area.

* WHEN...From 6 PM this evening to 5 AM MST Tuesday.

* ADDITIONAL DETAILS...Be prepared for reduced visibilities at
  times. Cold wind chills as low as 15 below zero will cause
  frostbite in as little as 30 minutes to exposed skin.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Weather Advisory for snow means periods of snow will
cause primarily travel difficulties. Be prepared for snow covered
roads and limited visibilities, and use caution while driving.
The latest road conditions can be obtained by calling 5 1 1.

$$

For more information from the National Weather Service visit
http://www.weather.gov/pocatello

jam



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