Red Flag Warning 37, NWS Denver/Boulder, CO

045 
WWUS85 KBOU 210738
RFWBOU

URGENT - FIRE WEATHER MESSAGE
National Weather Service Denver/Boulder CO
138 AM MDT Wed Oct 21 2020

...RED FLAG WARNING FOR THE MOUNTAIN VALLEYS THIS AFTERNOON AND
EVENING FOR LOW HUMIDITY AND GUSTY WINDS...
...RED FLAG WARNING FOR THE FRONT RANGE FOOTHILLS THIS AFTERNOON
AND TONIGHT FOR LOW HUMIDITY...GUSTY WINDS...AND POOR RECOVERY
OVERNIGHT...

.Winds will increase today ahead of a weather system that will
pass over Colorado on Thursday. It will also be a little warmer
and drier. As a result, Red Flag conditions are expected in the
mountain valleys and foothills this afternoon. Conditions will
improve in the valleys this evening, but the foothills will have
windy conditions continuing with poor humidity recovery. Overnight
maximum humidity in the foothills will be in the 20 to 30 percent
range while winds increase with gusts of up to 50 mph possible,
mainly in the higher foothills and wind prone lower foothill 
locations. The foothills will see a shift to northeast winds with
cooler temperatures and higher humidities behind a cold front
Thursday morning. These winds may also gust up to 30 mph during
the day Thursday.

COZ211-211800-
/O.EXA.KBOU.FW.W.0037.201021T1800Z-201022T0100Z/
Jackson County Below 9000 Feet-
138 AM MDT Wed Oct 21 2020

...RED FLAG WARNING IN EFFECT FROM NOON TODAY TO 7 PM MDT THIS
EVENING FOR WIND AND LOW HUMIDITY FOR NORTH PARK...

The National Weather Service in Denver has issued a Red Flag
Warning for wind and low relative humidity, which is in effect
from noon today to 7 PM MDT this evening.

* Affected Area...Fire Weather Zone 211.

* Timing...Noon to 7 PM MDT, Wednesday.

* Winds...West 20 to 30 mph with gusts up to 45 mph.

* Relative Humidity...As low as 16 percent.

* Impacts...Fires will start easily and spread rapidly.

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.

&&

$$

COZ216-211800-
/O.EXA.KBOU.FW.W.0037.201021T1800Z-201022T1400Z/
Jefferson and West Douglas Counties Above 6000 Feet/Gilpin/Clear
Creek/Northeast Park Counties Below 9000 Feet-
138 AM MDT Wed Oct 21 2020

...RED FLAG WARNING IN EFFECT FROM NOON TODAY TO 8 AM MDT
THURSDAY FOR WIND AND LOW RELATIVE HUMIDITY FOR THE SOUTHERN FRONT
RANGE FOOTHILLS...

The National Weather Service in Denver has issued a Red Flag
Warning for wind and low relative humidity, which is in effect
from noon today to 8 AM MDT Thursday.

* Affected Area...Fire Weather Zone 216.

* Timing...From noon Wednesday to 8 AM MDT Thursday.

* Winds...Southwest 10 to 20 mph with gusts up to 40 mph.

* Relative Humidity...As low as 12 percent. Poor humidity recovery
  overnight.

* Impacts...Fires will start easily and spread rapidly.

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.

&&

$$

COZ213-214-211800-
/O.CON.KBOU.FW.W.0037.201021T1800Z-201022T0100Z/
Grand and Summit Counties Below 9000 Feet-
Central and Southeast Park County-
138 AM MDT Wed Oct 21 2020

...RED FLAG WARNING REMAINS IN EFFECT FROM NOON TODAY TO 7 PM MDT
THIS EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR MIDDLE PARK
AND SOUTH PARK...

* Affected Area...Fire Weather Zones 213 and 214.

* Timing...Noon to 7 PM MDT, Wednesday.

* Winds...West 15 to 25 mph with gusts up to 40 mph.

* Relative Humidity...As low as 12 percent.

* Impacts...Fires will start easily and spread rapidly.

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.

&&

$$

COZ215-211800-
/O.CON.KBOU.FW.W.0037.201021T1800Z-201022T1400Z/
Larimer and Boulder Counties Between 6000 and 9000 Feet-
138 AM MDT Wed Oct 21 2020

...RED FLAG WARNING REMAINS IN EFFECT FROM NOON TODAY TO 8 AM MDT
THURSDAY FOR WIND AND LOW RELATIVE HUMIDITY FOR THE NORTHERN
FOOTHILLS...

* Affected Area...Fire Weather Zone 215.

* Timing...From noon Wednesday to 8 AM MDT Thursday.

* Winds...West 15 to 30 mph with gusts up to 50 mph.

* Relative Humidity...As low as 15 percent.

* Impacts...Fires will start easily and spread rapidly.

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.

&&

$$

Gimmestad

670 
WWUS85 KBOU 211800
RFWBOU

URGENT - FIRE WEATHER MESSAGE
National Weather Service Denver/Boulder CO
1200 PM MDT Wed Oct 21 2020

...RED FLAG WARNING FOR THE MOUNTAIN VALLEYS THIS AFTERNOON AND
EVENING FOR LOW HUMIDITY AND GUSTY WINDS... 

...RED FLAG WARNING FOR THE FRONT RANGE FOOTHILLS THIS AFTERNOON 
AND TONIGHT FOR LOW HUMIDITY...GUSTY WINDS...AND POOR RECOVERY 
OVERNIGHT...

.Winds will increase today ahead of a weather system that will
pass over Colorado on Thursday. It will also be a little warmer
and drier. As a result, Red Flag conditions are expected in the
mountain valleys and foothills this afternoon. Conditions will
improve in the valleys this evening, but the foothills will have
windy conditions continuing with poor humidity recovery.
Overnight maximum humidity in the foothills will be in the 20 to
30 percent range while winds increase with gusts of up to 50 mph
possible, mainly down to about 9000 feet and wind prone lower 
foothill locations. The foothills will see a shift to northeast 
winds with cooler temperatures and higher humidities behind a cold
front Thursday morning. These winds may also gust up to 30 mph 
during the day Thursday.

COZ211-213-214-220100-
/O.CON.KBOU.FW.W.0037.000000T0000Z-201022T0100Z/
Jackson County Below 9000 Feet-
Grand and Summit Counties Below 9000 Feet-
Central and Southeast Park County-
1200 PM MDT Wed Oct 21 2020

...RED FLAG WARNING REMAINS IN EFFECT UNTIL 7 PM MDT THIS EVENING
FOR WIND AND LOW RELATIVE HUMIDITY FOR NORTH PARK, MIDDLE PARK 
AND SOUTH PARK...

* Affected Area...Fire Weather Zones 211, 213 and 214.

* Timing...Noon to 7 PM MDT, Wednesday.

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

* Relative Humidity...As low as 11 percent.

* Impacts...Ongoing drought conditions combined with strong winds
  and low relative humidity mean conditions are prime for rapid
  fire growth. 

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.

&&

$$

COZ215-216-220200-
/O.CON.KBOU.FW.W.0037.000000T0000Z-201022T1400Z/
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-
1200 PM MDT Wed Oct 21 2020

...RED FLAG WARNING REMAINS IN EFFECT UNTIL 8 AM MDT THURSDAY FOR
WIND AND LOW RELATIVE HUMIDITY FOR THE FRONT RANGE FOOTHILLS...

* Affected Area...Fire Weather Zones 215 and 216.

* Timing...From noon Wednesday to 8 AM MDT Thursday.

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

* Relative Humidity...As low as 12 percent this afternoon, then
  recovering only into the 20 to 30 percent range overnight.

* Impacts...Ongoing drought conditions combined with strong winds
  and low relative humidity mean conditions are prime for rapid
  fire growth. Poor humidity recovery overnight with the gusty
  winds will allow continuation of active fire behavior.

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.

&&

$$

229 
WWUS85 KBOU 212132
RFWBOU

URGENT - FIRE WEATHER MESSAGE
National Weather Service Denver/Boulder CO
332 PM MDT Wed Oct 21 2020

...RED FLAG WARNING FOR THE MOUNTAIN VALLEYS THIS AFTERNOON AND
EARLY EVENING FOR LOW HUMIDITY AND GUSTY WINDS...THEN AGAIN FOR
SOUTH PARK THURSDAY...

...RED FLAG WARNING FOR THE FRONT RANGE FOOTHILLS THIS AFTERNOON
AND TONIGHT FOR LOW HUMIDITY...GUSTY WINDS...AND POOR HUMIDITY RECOVERY
OVERNIGHT...

.Red Flag conditions continue in the mountain valleys and 
foothills this afternoon. Conditions will improve in the valleys 
this evening, but the foothills will have windy conditions 
with poor humidity recovery. Overnight maximum humidity in the 
foothills will be in the 20 to 30 percent range while winds 
increase with gusts of up to 50 mph possible, mainly down to about
9000 feet and wind prone lower foothill locations. The foothills 
will see a shift to northeast winds with cooler temperatures and 
higher humidities behind a cold front Thursday morning. These 
winds may also gust up to 30 mph during the day Thursday. Critical
conditions will return to South Park Thursday. 

COZ214-220600-
/O.NEW.KBOU.FW.W.0038.201022T1600Z-201023T0100Z/
/O.CON.KBOU.FW.W.0037.000000T0000Z-201022T0100Z/
Central and Southeast Park County-
332 PM MDT Wed Oct 21 2020

...RED FLAG WARNING REMAINS IN EFFECT UNTIL 7 PM MDT THIS EVENING
FOR WIND AND LOW RELATIVE HUMIDITY FOR SOUTH PARK... 

...RED FLAG WARNING IN EFFECT FROM 10 AM TO 7 PM MDT THURSDAY FOR
WIND AND LOW RELATIVE HUMIDITY FOR SOUTH PARK...

The National Weather Service in Denver has issued a Red Flag
Warning for wind and low relative humidity, which is in effect
from 10 AM to 7 PM MDT Thursday.

* Affected Area...Fire Weather Zone 214.

* Timing...Until 7 PM MDT this evening. Then again 10 AM MDT 
  Thursday morning until 7 PM Thursday evening. 

* Winds...West 10 to 20 mph with gusts up to 35 mph.

* Relative Humidity...As low as 11 percent.

* Impacts...Ongoing drought conditions combined with strong 
  winds and low relative humidity mean conditions are prime for 
  rapid fire growth.

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.

&&

$$

COZ211-213-220100-
/O.CON.KBOU.FW.W.0037.000000T0000Z-201022T0100Z/
Jackson County Below 9000 Feet-
Grand and Summit Counties Below 9000 Feet-
332 PM MDT Wed Oct 21 2020

...RED FLAG WARNING REMAINS IN EFFECT UNTIL 7 PM MDT THIS EVENING
FOR WIND AND LOW RELATIVE HUMIDITY FOR NORTH PARK AND MIDDLE PARK...

* Affected Area...Fire Weather Zones 211 and 213.

* Timing...Until 7 PM MDT this evening.

* Winds...West 15 to 25 mph with gusts up to 40 mph.

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

* Impacts...Ongoing drought conditions combined with strong 
  winds and low relative humidity mean conditions are prime for 
  rapid fire growth.

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.

&&

$$

COZ215-216-220600-
/O.CON.KBOU.FW.W.0037.000000T0000Z-201022T1400Z/
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-
332 PM MDT Wed Oct 21 2020

...RED FLAG WARNING REMAINS IN EFFECT UNTIL 8 AM MDT THURSDAY FOR
WIND AND LOW RELATIVE HUMIDITY FOR THE FRONT RANGE FOOTHILLS...

* Affected Area...Fire Weather Zones 215 and 216.

* Timing...Until 8 AM MDT Thursday.

* Winds...West 10 to 20 mph with gusts up to 40 mph, relaxing to
  gusts to 25 mph this evening, increasing back up to 10 to 20 mph
  with gusts 25 to 40 mph, highest readings above 7000 feet.

* Relative Humidity...As low as 12 percent.

* Impacts...Ongoing drought conditions combined with strong 
  winds and low relative humidity mean conditions are prime for 
  rapid fire growth. Poor humidity recovery overnight with the 
  gusty winds will allow continuation of active fire behavior.

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.

&&

$$

417 
WWUS85 KBOU 220105
RFWBOU

URGENT - FIRE WEATHER MESSAGE
National Weather Service Denver/Boulder CO
705 PM MDT Wed Oct 21 2020

...RED FLAG WARNING FOR SOUTH PARK THURSDAY...

...RED FLAG WARNING FOR THE FRONT RANGE FOOTHILLS TONIGHT FOR LOW
HUMIDITY...GUSTY WINDS...AND POOR HUMIDITY RECOVERY OVERNIGHT...

.Red Flag conditions will improve in the valleys this evening, 
but the foothills will have windy conditions with poor humidity 
recovery. Overnight maximum humidity in the foothills will be in 
the 20 to 30 percent range while winds increase with gusts of up 
to 50 mph possible, mainly down to about 9000 feet and wind prone 
lower foothill locations. The foothills will see a shift to 
northeast winds with cooler temperatures and higher humidities 
behind a cold front Thursday morning. These winds may also gust up
to 30 mph during the day Thursday. Critical conditions will 
return to South Park Thursday.

COZ214-220915-
/O.EXP.KBOU.FW.W.0037.000000T0000Z-201022T0100Z/
/O.CON.KBOU.FW.W.0038.201022T1600Z-201023T0100Z/
Central and Southeast Park County-
705 PM MDT Wed Oct 21 2020

...RED FLAG WARNING REMAINS IN EFFECT FROM 10 AM TO 7 PM MDT
THURSDAY FOR WIND AND LOW RELATIVE HUMIDITY FOR SOUTH PARK...
...RED FLAG WARNING HAS EXPIRED THIS EVENING FOR WIND AND LOW 
RELATIVE HUMIDITY FOR SOUTH PARK...

* Affected Area...Fire Weather Zone 214.

* Timing...10 AM MDT Thursday morning until 7 PM Thursday 
  evening.

* Winds...West 10 to 20 mph with gusts up to 35 mph.

* Relative Humidity...As low as 11 percent.

* Impacts...Ongoing drought conditions combined with strong 
  winds and low relative humidity mean conditions are prime for 
  rapid fire growth.

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.

&&

$$

COZ211-213-220215-
/O.EXP.KBOU.FW.W.0037.000000T0000Z-201022T0100Z/
Jackson County Below 9000 Feet-
Grand and Summit Counties Below 9000 Feet-
705 PM MDT Wed Oct 21 2020

...RED FLAG WARNING HAS EXPIRED FOR WIND AND LOW RELATIVE
HUMIDITY FOR NORTH PARK AND MIDDLE PARK...

Winds will decrease this evening, but humidity recover will 
remain low.

$$

COZ215-216-220915-
/O.CON.KBOU.FW.W.0037.000000T0000Z-201022T1400Z/
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-
705 PM MDT Wed Oct 21 2020

...RED FLAG WARNING REMAINS IN EFFECT UNTIL 8 AM MDT THURSDAY FOR
WIND AND LOW RELATIVE HUMIDITY FOR THE FRONT RANGE FOOTHILLS...

* Affected Area...Fire Weather Zones 215 and 216.

* Timing...Until 8 AM MDT Thursday.

* Winds...West 10 to 20 mph with gusts up to 40 mph.

* Relative Humidity...As low as 9 percent.

* Impacts...Ongoing drought conditions combined with strong 
  winds and low relative humidity mean conditions are prime for 
  rapid fire growth. Poor humidity recovery overnight with the 
  gusty winds will allow continuation of active fire behavior.

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.

&&

$$

105 
WWUS85 KBOU 220957
RFWBOU

URGENT - FIRE WEATHER MESSAGE
National Weather Service Denver/Boulder CO
357 AM MDT Thu Oct 22 2020

...RED FLAG WARNING FROM 10 AM THIS MORNING TO 7 PM MDT THIS 
EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR SOUTH PARK, FIRE
WEATHER ZONE 214...

COZ215-216-221100-
/O.CAN.KBOU.FW.W.0037.000000T0000Z-201022T1400Z/
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-
357 AM MDT Thu Oct 22 2020

...RED FLAG WARNING IS CANCELLED FOR WIND AND LOW RELATIVE
HUMIDITY FOR THE FRONT RANGE FOOTHILLS...

The National Weather Service in Denver has cancelled the Red Flag
Warning.

Gusty downslope winds did not develop overnight. In addition to
this, a strong cold front will arrive sooner than expected.
Therefore the Red Flag Warning has been canceled.

$$

COZ214-230100-
/O.CON.KBOU.FW.W.0038.201022T1600Z-201023T0100Z/
Central and Southeast Park County-
357 AM MDT Thu Oct 22 2020

...RED FLAG WARNING REMAINS IN EFFECT FROM 10 AM THIS MORNING TO
7 PM MDT THIS EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR
SOUTH PARK...

* Affected Area...Fire Weather Zone 214.

* Timing...10 AM MDT Thursday morning until 7 PM Thursday 
  evening.

* Winds...West 10 to 20 mph with gusts up to 40 mph.

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

* Impacts...Ongoing drought conditions combined with strong 
  winds and low relative humidity mean conditions are prime for 
  rapid fire growth.

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.

&&

$$

Area Forecast Discussion
National Weather Service Denver/Boulder CO
324 PM MDT Tue Oct 20 2020

.SHORT TERM...(This evening through Wednesday)
Issued at 315 PM MDT Tue Oct 20 2020

Mid to upper level moisture in west-northwest flow aloft continues
to produce wave clouds, most prominent over and downwind of the
Front Range Mountains. A dry cold front has made its way all the
way west across the plains and into the very lower foothills,
concentrating a lot of the smoke from the wildfires against the
foothills. This front should remain where it is this evening,
before a wiggle in the flow aloft will begin to induce a lee
surface trough bringing westerly winds back out of the higher
terrain. Not as strong as last night, so lows should be able to
cool off more tonight.

Winds aloft will be turning more west-southwesterly tomorrow as up
upper shortwave trough drops south into the Pacific Northwest.
This will bring in warmer and drier weather, with winds remaining
gusty. This will increase fire danger for the mountains, see more
in the discussion below. Less wave cloud action will help for
warmer temperatures over the plains, however with active fire
behavior expected again, smoke plumes may limit some readings from
getting too high mainly over Larimer and Boulder counties.

.LONG TERM...(Wednesday night through Tuesday)
Issued at 315 PM MDT Tue Oct 20 2020

Falls arrives in the extended but first have to get through a little
more elevated fire weather concerns. 500 mb flow starts with broad
nw flow over the western US and a weak shortwave trough diving
southwest out of the pacific nw. Trough axis reaches Idaho/Wyoming
border by 12z Thursday and brushes northern Colorado during the day
Thursday and moves on Thursday  night. Models pessimistic about
precip on Thursday afternoon now with this feature, but have left
chc pops in the northern mountains and northern plains. Have never
been bullish on precip amounts with this feature these last few
days, and although I still think we'll see a dusting of snow in the
higher terrain and rain/snow mix on the plains, will be light qpf
amounts. Regardless, any precip and higher RH will be a help to
firefighters.

Of more note with the Thursday system is the first cold front that
will begin our cooldown to more late fall-like temperatures. Lows
Wednesday night in the 30s and 40s will give way to teens and 20s
Thursday night. One more day to wrap up that cold weather prep.

Low level flow on the plains turns east during the day Friday, then
back to south, while higher elevation winds tap more into the upper
westerly flow and stay that direction through the end of the week.

Heading into the weekend our next system starts the process of
carving out a deeper trough in the west. Initial shortwave trough on
Saturday with surface front passes by mainly to the north, with
another shot of northern mountain/northern plains snow. this
shortwave is kicked on east as a second shortwave deepens a
positively tilted trough over the western US. ECMWF deeper/slower as
it has been all week, and even wants to close off a low near
southern CA/AZ Monday. Jet dynamics will come into play
Sunday/Monday but right now best 100 Kt jet is forecast to be over
southern CO out of our forecast area with better pops that area.

&&

.AVIATION...(For the 18Z TAFS through 18Z Wednesday afternoon)
Issued at 315 PM MDT Tue Oct 20 2020

Winds are easterly to northeasterly behind a weak front. Expect wind
speeds to slowly decrease through the afternoon and turn to normal
drainage patterns later tonight, leading into southerly winds
tomorrow morning. West winds may mix down again during the day and
afternoon.  The East Troublesome fire is still burning hot and
putting up a smoke plume. There have been brief, sporadic periods of
reduced surface visibility and pilots have reported reduced
slantwise visibility at DEN. The front did help to clear out some of
the smoke at the surface though it seems to have now concentrated
much of that smoke in the foothills. Easterly winds in the low
levels behind the front should keep smoke at the surface away from
most terminals for a few more hours at least, though smoke aloft
will persist. VFR conditions expected through the rest of the TAF
cycle except at terminals very close to the foothills, such as BJC
where reduced visibility is still being reported. We will continue
to keep smoke in the TAFs without visibility reduction this
afternoon, except in the current line of BJC.

&&

.FIRE WEATHER...
Issued at 315 PM MDT Tue Oct 20 2020

Near critical fire conditions over the high terrain with gusty
wind and low humidity should be improving this evening as winds
decouple in the high mountain valleys, and an cool front pushes
into the foothills from the east to improve humidity. However, a
surface lee trough will be forming later this evening to begin the
westerly winds again decreasing humidity recovery into the early
morning hours. Warmer and much drier conditions are expected
tomorrow, including less wave cloud activity. Winds will be
slighty weaker, however will still be at criteria. Therefore, have
issued a Red Flag Warning for Middle and South Parks for humidity
near 10% and winds gusting 25 to 35 mph. Over the northern
foothills, conditions may be marginal, but with a trend involving drier
humidities expected, and the ongoing fire activity, have included
Fire Weather Zone 215 in the Red Flag Warning. In addition, even
drier dewpoints are expected to move in tomorrow evening and
overnight, and a mountain wave signature will show up overnight.
This will result in extremely poor humidity recoveries overnight
with winds reaching 40 to 50 mph over the mountains and higher
foothills. Have therefore extended the Red Flag Warning into
Thursday morning before a cold front moves down from the north.

Elsewhere Wednesday night, modest RH recovery into the 30s in the
mountains and 40s-50s on the plains. On Thursday min RH in South
Park back down to the mid teens, with 20s and higher elsewhere. A
weak upper trough to move through late Thursday will bring light
snow over the higher terrain and northern plains. Liquid amounts a
few hundredths at best but will help RH recovery into the 60-90
percent range. Westerly flow over higher terrain will continue
with wind 20-30 mph, although improving humidity. Seasonably cold
temperatures to continue from Thursday onward, and a second trough
will bring more moisture to the region for the weekend. Minimum
RH during the day improves from Friday onward, with good RH
recovery during the nightime hours.

&&

.BOU WATCHES/WARNINGS/ADVISORIES...
Red Flag Warning from noon to 7 PM MDT Wednesday for COZ213-214.

Red Flag Warning from noon Wednesday to 8 AM MDT Thursday for
COZ215.

&&

SHORT TERM...Kriederman
LONG TERM...Hanson
AVIATION...Kriederman
FIRE WEATHER...Kriederman/Hanson

Hazardous Weather Outlook
National Weather Service Denver/Boulder CO
1127 AM MDT Tue Oct 20 2020

COZ030>051-211730-
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-
1127 AM MDT Tue Oct 20 2020

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

.DAY ONE...This Afternoon and Tonight

The mountains will remain breezy today with mild temperatures,
resulting in another day of very high fire danger. Wind gusts to
30 mph will be common, and the higher mountains could have gusts
to 50 mph at times. It will also be breezy behind a cold front
currently moving southwest across the plains. Fire danger will
remain elevated tonight as gusty west winds continue and humidity
recovery overnight at the higher elevations is poor.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday

Winds increase Wednesday and continue through early Thursday
ahead of a cold front. This combined with dry conditions will
elevate the fire danger. A storm system will move across the
Central Rockies this weekend. This system will bring a good chance
for snow Saturday night and Sunday along with cold temperatures.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be needed today and tonight.