Winter Storm Watch 14, NWS Denver/Boulder, CO

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Hazardous Weather Outlook
National Weather Service Denver/Boulder CO
1109 AM MDT Sat Sep 30 2017

COZ030>051-011715-
Jackson County Below 9000 Feet-
West Jackson and West Grand Counties Above 9000 Feet-
Grand and Summit Counties Below 9000 Feet-
South and East Jackson/Larimer/North and Northeast Grand/
Northwest Boulder Counties Above 9000 Feet-
South and Southeast Grand/West Central and Southwest Boulder/
Gilpin/Clear Creek/Summit/North and West Park Counties Above
9000 Feet-Larimer and Boulder Counties Between 6000 and 9000 Feet-
Jefferson and West Douglas Counties Above 6000 Feet/Gilpin/Clear
Creek/Northeast Park Counties Below 9000 Feet-
Central and Southeast Park County-
Larimer County Below 6000 Feet/Northwest Weld County-
Boulder And Jefferson Counties Below 6000 Feet/West Broomfield
County-
North Douglas County Below 6000 Feet/Denver/West Adams and
Arapahoe Counties/East Broomfield County-
Elbert/Central and East Douglas Counties Above 6000 Feet-
Northeast Weld County-Central and South Weld County-Morgan County-
Central and East Adams and Arapahoe Counties-
North and Northeast Elbert County Below 6000 Feet/North Lincoln
County-
Southeast Elbert County Below 6000 Feet/South Lincoln County-
Logan County-Washington County-Sedgwick County-Phillips County-
1109 AM MDT Sat Sep 30 2017

This hazardous weather outlook is for northeast and north central
Colorado.

.DAY ONE...Today and Tonight

Scattered showers and thunderstorms are expected to form over the
high country this afternoon and then move eastward across
northeast Colorado late this afternoon and evening. An isolated
severe storm or two may occur over the eastern plains with hail
up to one inch in diameter and wind gusts to 60 mph.

The showers and thunderstorms are expected to end over the
plains by late evening. Over the mountains, showers will become
likely tonight with the snow level down to 10000 feet. Snowfall
accumulations of 2 to 6 inches will be possible in some mountain
areas north of I-70 overnight.

.DAYS TWO THROUGH SEVEN...Sunday through Friday

After a brief break, the next storm system will quickly arrive in
the northern mountains by mid day Sunday. Snow levels will lower
from 9000 to 10000 feet on Sunday, down to between 7000 and 8000
feet over the northern border area by late Sunday night and
Monday. The combination of colder temperatures and a prolonged
period of precipitation may result in heavy snow accumulations
across the northern mountains and high valleys, favoring the
northern border area including Jackson, Grand, and higher
elevations of Larimer County. Farther south in the mountains
including the I-70 through Summit County, snow levels will be a
little higher and precipitation amounts should be lighter.
However, there may still be travel impacts with slushy or snow
covered roads over the higher mountain passes including the
approaches to the Eisenhower Tunnel and Vail Pass.

In lower elevations, an isolated severe storm or two will be
possible east of a Sterling to Akron line late Sunday afternoon
and evening. Then much cooler weather and a better chance of
showers will spread across the plains Sunday night into Monday
night. Precipitation is expected to decrease by early Tuesday.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be needed today or tonight.