Special Weather Statement, NWS Denver/Boulder, CO

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Hazardous Weather Outlook
National Weather Service Denver/Boulder CO
1057 AM MDT Sun Oct 1 2017

COZ030>051-021700-
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-
1057 AM MDT Sun Oct 1 2017

...Winter Storm Warning for the Northern Mountains this afternoon
through Monday evening...
....Winter Weather Advisory for the North Central Mountains
including the I-70 Corridor through Summit County, and North Park,
tonight through Monday evening....

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

.DAY ONE...Today and Tonight

Widespread rain and snow showers, along with a few thunderstorms,
will continue over the higher terrain today through tonight with
the snow level dropping below 9,000 feet this evening, and then
down to around 7,000 feet near the Wyoming border by late tonight.
Periods of heavy snow will occur in the northern mountains with
hazardous travel conditions developing this afternoon and evening.
Snowfall rates up to 2 inches per hour can be expected from the
heavier showers.

Across northeast Colorado there will be a chance of showers and
thunderstorms. An isolated severe storm or two is possible over
the far northeast plains. Hail to one inch in diameter along with
wind gusts to 60 mph will be possible.

.DAYS TWO THROUGH SEVEN...Monday through Saturday

Heavy bands of snow will continue over the Northern mountains
Monday and Monday evening before diminishing late Monday night.
The heaviest snow is expected to occur across Jackson, Grand, and
the higher elevations of Larimer County Monday morning into the
afternoon. In the I-70 Mountain Corridor, a lull in the storm is
expected into Monday morning before a period of moderate to heavy
snow moves back in during the afternoon. Snow levels will range
from around 7,000 feet near the Wyoming border, to around 8,500 to
9,500 feet along the I-70 Corridor. Total snow accumulations by
the time the storm diminishes Monday evening are expected to range
from 8-16 inches in the mountains of Jackson, Grand, and Larimer
Counties, with local amounts up to 2 feet possible. In the
mountains along the I-70 Corridor through Summit County, and in the
lower elevations of Jackson County, look for amounts of 4 to 10
inches.

Across the plains, showers and a few embedded thunderstorms will
occur through Monday evening, mainly from Denver, Fort Morgan,
and Akron northward to the Wyoming and Nebraska border. Showers
will diminish Monday evening with drier but still cool conditions
for Tuesday. More showers and clouds may return Tuesday night and
Wednesday across the eastern plains as another disturbance
approaches Colorado.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not anticipated today today or tonight. Any
reports of accumulating snow in the mountains will be appreciated.

Special Weather Statement
National Weather Service Denver CO
203 PM MDT SUN OCT 1 2017

COZ049-012030-
Washington County CO-
203 PM MDT SUN OCT 1 2017

...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN WASHINGTON COUNTY
UNTIL 230 PM MDT...

At 202 PM MDT, Doppler radar was tracking a strong thunderstorm near
Platner, or 7 miles northeast of Akron, moving northeast at 30 mph.

Nickel size hail and winds in excess of 40 mph will be possible with
this storm.

Locations impacted include...
Otis, Lone Star, Burdett and Platner.

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

LAT...LON 4035 10279 4035 10280 4027 10279 4015 10280
      4009 10316 4034 10317 4044 10278
TIME...MOT...LOC 2002Z 244DEG 26KT 4021 10308

COOPER