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Hazardous Weather Outlook

Hazardous Weather Outlook
National Weather Service Denver/Boulder CO
1001 AM MST Mon Dec 11 2017

COZ030>051-121715-
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-
1001 AM MST Mon Dec 11 2017

...Critical Fire Danger this Afternoon for Portions of Northeast
Colorado...

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

.DAY ONE...Today and Tonight

Northerly winds will increase across the northeast plains of
Colorado today behind a quick moving dry cold front. Winds could
gust to 45 mph this afternoon especially up along the Wyoming and
Nebraska borders and across Washington County. Humidities will be
slightly higher on the plains today with the cooler temperatures
behind the front. However, the strong and gusty winds will be
sufficient to produce critical rangeland fire behavior across the
northeast corner of the state. Otherwise, expect another dry day
and night with generally light breezes and above average
temperatures.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday

Dry and unseasonably warm conditions will continue through
Thursday due to a strong high pressure ridge over the western
United States. Temperatures will average 10 to 20 degrees above
normal across the plains. Thursday will bring some cooling along
with a chance of snow for the mountains. Another disturbance over
the weekend could produce additional snow over the higher
elevations and cooler temperatures across the plains.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be needed today or tonight.

$$




Red Flag Warning

URGENT - FIRE WEATHER MESSAGE
National Weather Service Denver/Boulder CO
436 AM MST Mon Dec 11 2017

...Red Flag Warning from 11 AM MST to 5 PM MST Today for Portions
of Northeast and East Central Colorado...

.Northerly winds will increase across the northeast plains of
Colorado later this morning behind a fast moving dry cold front.
Winds could gust to 45 mph this afternoon particularly up along
the Wyoming and Nebraska borders and across Washington County
where the pressure gradient and winds aloft will be strongest.
Minimum RH values will be slightly higher today with the cooler
temperatures. However, the strong and gusty winds will be
sufficient to produce critical rangeland fire behavior for
portions of northeast Colorado roughly east of a Cheyenne-to-
Limon line. Conditions should quickly improve with sunset.


COZ238-242-244-246>251-111945-
/O.CON.KBOU.FW.W.0031.171211T1800Z-171212T0000Z/
Larimer County Below 6000 Feet/Northwest Weld County-
Northeast Weld County-Morgan County-
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-
436 AM MST Mon Dec 11 2017

...RED FLAG WARNING REMAINS IN EFFECT FROM 11 AM THIS MORNING TO
5 PM MST THIS AFTERNOON FOR STRONG WINDS AND LOW RELATIVE
HUMIDITY FOR THE NORTHERN BORDER AREA AND EASTERN PLAINS...

* Affected Area...Fire Weather Zones 238...242...244...246...
  247...248...249...250 and 251.

* Timing...Winds will increase later this morning with passage of
  a dry cold front, and become strong and gusty this afternoon.
  Humidities will be slightly higher today, but still low enough
  to support critical fire behavior. Conditions will quickly
  improve by sunset.

* Winds...North 15 to 25 mph with gusts up to 45 mph.

* Relative Humidity...As low as 13 percent.

* Impacts...Gusty winds and low humidity will be favorable for
  rapid fire spread especially in open rangeland.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Red Flag Warning means that critical fire weather conditions
are either occurring now....or will shortly. A combination of
strong winds...low relative humidity...and warm temperatures can
contribute to extreme fire behavior.

&&

$$
Baker




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Page last modified: May 16, 2007
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