Alert archive / Colorado / Red Flag Warnings in 2019

Red Flag Warning 16, NWS Denver/Boulder, CO

October 8, 201911 counties in Colorado

NWS Denver/Boulder, CO issued this red flag warning at Oct 8, 2019, 4:51 AM MDT for 11 counties in Colorado. It took effect at Oct 9, 2019, 12:00 PM MDT. It was in force for 6 hr. 1 report came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued
Oct 8, 2019, 4:51 AM MDT (10:51 UTC)
In effect from
Oct 9, 2019, 12:00 PM MDT
Expired
Oct 9, 2019, 5:56 PM MDT
In force
6 hr
Issued by
NWS Denver/Boulder, CO

Counties Arapahoe County, CO, Boulder County, CO, Clear Creek County, CO, Douglas County, CO, Elbert County, CO, Gilpin County, CO, Grand County, CO, Jefferson County, CO, Lincoln County, CO, Park County, CO, Summit County, CO

The radar

The Denver radar (KFTG), 57 km from the middle of the area, began a volume at 10:53 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

What was reported inside it

TimeReportWhereRemark
Oct 9, 5:52 PM MDTNON-TSTM WND GST 661 N Buckley Afb, COAWOS STATION KBKF BUCKLEY ANGB DEN.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Denver, CO (KDNR), launched 00:00Z, 10.9 hours before the alert went out and 167 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Denver, CO at 00:00Z on 2019-10-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Denver, CO at 00:00Z on 2019-10-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 22 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
4980 m above ground
0-6 km bulk shear
36 kt
0-1 km storm-relative helicity
22 m²/s²
0-3 km storm-relative helicity
107 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

321 
WWUS85 KBOU 081051
RFWBOU

URGENT - FIRE WEATHER MESSAGE
National Weather Service Denver/Boulder CO
451 AM MDT Tue Oct 8 2019

.Strong winds and very low relative humidity are expected across
most of the northern Colorado mountains this afternoon and again
on Wednesday afternoon. The worst conditions will be along and
north of Interstate 70 today, and along and south of Interstate 70
on Wednesday.

COZ212-213-082200-
/O.UPG.KBOU.FW.A.0008.191009T1800Z-191010T0000Z/
/O.NEW.KBOU.FW.W.0016.191009T1800Z-191010T0000Z/
/O.EXA.KBOU.FW.W.0015.191008T1600Z-191009T0000Z/
South and Southeast Grand/West Central and Southwest Boulder/
Gilpin/Clear Creek/Summit/North and West Park Counties Above
9000 Feet-Grand and Summit Counties Below 9000 Feet-
451 AM MDT Tue Oct 8 2019

...RED FLAG WARNING IN EFFECT FROM 10 AM THIS MORNING TO 6 PM MDT
THIS EVENING AND AGAIN FROM NOON TO 6 PM MDT WEDNESDAY FOR WIND 
AND LOW RELATIVE HUMIDITY FOR GRAND AND SUMMIT COUNTIES AND THE 
SURROUNDING MOUNTAINS...

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 this morning to 6 PM MDT this evening. A Red Flag 
Warning has also been issued from noon to 6 PM MDT Wednesday. The 
Fire Weather Watch is no longer in effect.

* Affected Area...Fire Weather Zones 212 and 213.

* Winds...Southwest 10 to 20 mph with gusts up to 30 mph. Gusts of
  to 55 mph over the higher mountains on Wednesday afternoon.

* Timing...Tuesday from 10 am to 6 pm and Wednesday from Noon
  through 6pm.

* Relative Humidity...As low as 10 percent.

* Impacts...Conditions will be favorable for the rapid ignition, 
  growth, and spread of fires.

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.

&&

$$

COZ214-216-082200-
/O.UPG.KBOU.FW.A.0008.191009T1800Z-191010T0000Z/
/O.NEW.KBOU.FW.W.0016.191009T1800Z-191010T0000Z/
Central and Southeast Park County-
Jefferson and West Douglas Counties Above 6000 Feet/Gilpin/Clear
Creek/Northeast Park Counties Below 9000 Feet-
451 AM MDT Tue Oct 8 2019

...RED FLAG WARNING IN EFFECT FROM NOON TO 6 PM MDT WEDNESDAY FOR
WIND AND LOW RELATIVE HUMIDITY FOR SOUTH PARK AND 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 to 6 PM MDT Wednesday. The Fire Weather Watch is no 
longer in effect.

* Affected Area...Fire Weather Zones 214 and 216.

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

* Timing...Wednesday from Noon through 6pm MDT.

* Relative Humidity...As low as 14 percent.

* Impacts...Conditions will be favorable for the rapid ignition, 
  growth, and spread of fires.

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.

&&

$$

COZ241-247-082200-
/O.UPG.KBOU.FW.A.0008.191009T1800Z-191010T0000Z/
/O.NEW.KBOU.FW.W.0016.191009T1800Z-191010T0000Z/
Elbert/Central and East Douglas Counties Above 6000 Feet-
Southeast Elbert County Below 6000 Feet/South Lincoln County-
451 AM MDT Tue Oct 8 2019

...RED FLAG WARNING IN EFFECT FROM NOON TO 6 PM MDT WEDNESDAY FOR
WIND AND LOW RELATIVE HUMIDITY FOR DOUGLAS, ELBERT, AND SOUTHERN
LINCOLN COUNTIES...

The National Weather Service in Denver has issued a Red Flag
Warning for wind and low relative humidity, which is in effect 
from noon to 6 PM MDT Wednesday. The Fire Weather Watch is no 
longer in effect.

* Affected Area...Fire Weather Zones 241 and 247.

* Winds...Southwest 10 to 20 mph with gusts up to 30 mph.

* Timing...Wednesday from Noon through 6pm MDT.

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

* Impacts...Conditions will be favorable for the rapid ignition, 
  growth, and spread of fires.

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.

&&

$$

COZ211-215-217-218-082200-
/O.CON.KBOU.FW.W.0015.191008T1600Z-191009T0000Z/
Jackson County Below 9000 Feet-
Larimer and Boulder Counties Between 6000 and 9000 Feet-
West Jackson and West Grand Counties Above 9000 Feet-
South and East Jackson/Larimer/North and Northeast Grand/
Northwest Boulder Counties Above 9000 Feet-
451 AM MDT Tue Oct 8 2019

...RED FLAG WARNING REMAINS IN EFFECT FROM 10 AM THIS MORNING TO
6 PM MDT THIS EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR THE
NORTHERN MOUNTAINS...NORTHERN FOOTHILLS AND NORTH PARK...

* Affected Area...Fire Weather Zones 211...215...217 and 218.

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

* Timing...Tuesday from 10am through 6pm MDT.

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

* Impacts...Conditions will be favorable for the rapid ignition, 
  growth, and spread of fires.

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/JK
5 follow-up statements
857 
WWUS85 KBOU 090008
RFWBOU

URGENT - FIRE WEATHER MESSAGE
National Weather Service Denver/Boulder CO
608 PM MDT Tue Oct 8 2019


...RED FLAG WARNING FOR THE CENTRAL MOUNTAINS AND HIGH 
VALLEYS...SOUTHERN FRONT RANGE FOOTHILLS...AND PALMER DIVIDE NOON
TO 6 PM WEDNESDAY FOR GUSTY WINDS AND LOW HUMIDITY...FIRE WEATHER
ZONES 212...213...214...216...241...AND 247...

.Winds have decreased quickly this evening and will stay lighter
overnight through mid morning Wednesday. Humidity recovery will be
poor to moderate. Then another round of gusty winds and low 
relative humidity are expected Wednesday afternoon. The worst 
conditions will be along and south of Interstate 70 on Wednesday.

COZ212-213-090815-
/O.EXP.KBOU.FW.W.0015.000000T0000Z-191009T0000Z/
/O.CON.KBOU.FW.W.0016.191009T1800Z-191010T0000Z/
South and Southeast Grand/West Central and Southwest Boulder/
Gilpin/Clear Creek/Summit/North and West Park Counties Above
9000 Feet-Grand and Summit Counties Below 9000 Feet-
608 PM MDT Tue Oct 8 2019

...RED FLAG WARNING REMAINS IN EFFECT FROM NOON TO 6 PM MDT
WEDNESDAY FOR WIND AND LOW RELATIVE HUMIDITY FOR MUCH OF GRAND AND
SUMMIT COUNTIES...FIRE WEATHER ZONES 212 AND 213...
...TODAY'S RED FLAG WARNING HAS EXPIRED FOR WIND AND LOW RELATIVE
HUMIDITY...

* Affected Area...Fire Weather Zones 212 and 213.

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

* Timing...Wednesday from Noon through 6pm.

* Relative Humidity...As low as 14 percent.

* Impacts...Conditions will be favorable for the rapid ignition, 
  growth, and spread of fires.

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.

&&

$$

COZ211-215-217-218-090115-
/O.EXP.KBOU.FW.W.0015.000000T0000Z-191009T0000Z/
Jackson County Below 9000 Feet-
Larimer and Boulder Counties Between 6000 and 9000 Feet-
West Jackson and West Grand Counties Above 9000 Feet-
South and East Jackson/Larimer/North and Northeast Grand/
Northwest Boulder Counties Above 9000 Feet-
608 PM MDT Tue Oct 8 2019

...RED FLAG WARNING HAS EXPIRED FOR WIND AND LOW RELATIVE
HUMIDITY FOR NORTH PARK...THE NORTHERN FRONT RANGE MOUNTAINS AND
NORTHERN FRONT RANGE FOOTHILLS...

Winds have decreased sufficiently, but there will only be poor to
moderate humidity recovery overnight. Humidities should be a
little higher on Wednesday, but fire danger will still be elevated
due to gusty winds. 

$$

COZ214-216-090815-
/O.CON.KBOU.FW.W.0016.191009T1800Z-191010T0000Z/
Central and Southeast Park County-
Jefferson and West Douglas Counties Above 6000 Feet/Gilpin/Clear
Creek/Northeast Park Counties Below 9000 Feet-
608 PM MDT Tue Oct 8 2019

...RED FLAG WARNING REMAINS IN EFFECT FROM NOON TO 6 PM MDT
WEDNESDAY FOR WIND AND LOW RELATIVE HUMIDITY FOR SOUTH PARK AND
THE SOUTHERN FRONT RANGE FOOTHILLS...

* Affected Area...Fire Weather Zones 214 and 216.

* Winds...Southwest 15 to 25 mph with gusts up to 35 mph.

* Timing...Wednesday from Noon through 6pm MDT.

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

* Impacts...Conditions will be favorable for the rapid ignition, 
  growth, and spread of fires.

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.

&&

$$

COZ241-247-090815-
/O.CON.KBOU.FW.W.0016.191009T1800Z-191010T0000Z/
Elbert/Central and East Douglas Counties Above 6000 Feet-
Southeast Elbert County Below 6000 Feet/South Lincoln County-
608 PM MDT Tue Oct 8 2019

...RED FLAG WARNING REMAINS IN EFFECT FROM NOON TO 6 PM MDT
WEDNESDAY FOR WIND AND LOW RELATIVE HUMIDITY FOR THE PALMER DIVIDE
AREA AND SOUTHERN LINCOLN COUNTY...

* Affected Area...Fire Weather Zones 241 and 247.

* Winds...Southwest 15 to 20 mph with gusts up to 30 mph.

* Timing...Wednesday from Noon through 6pm MDT.

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

* Impacts...Conditions will be favorable for the rapid ignition, 
  growth, and spread of fires.

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.

&&

$$
603 
WWUS85 KBOU 090214
RFWBOU

URGENT - FIRE WEATHER MESSAGE
National Weather Service Denver/Boulder CO
814 PM MDT Tue Oct 8 2019

...RED FLAG WARNING FOR THE CENTRAL MOUNTAINS AND HIGH VALLEYS...
SOUTHERN FRONT RANGE FOOTHILLS...AND PALMER DIVIDE NOON TO 6 PM
WEDNESDAY FOR GUSTY WINDS AND LOW HUMIDITY...FIRE WEATHER ZONES
212...213...214...216...241...AND 247...

.Humidity recovery will be poor to moderate overnight. Then 
another round of gusty winds and low relative humidity are 
expected Wednesday afternoon. The worst conditions will be along 
and south of Interstate 70 on Wednesday.

COZ212>214-216-091200-
/O.CON.KBOU.FW.W.0016.191009T1800Z-191010T0000Z/
South and Southeast Grand/West Central and Southwest Boulder/
Gilpin/Clear Creek/Summit/North and West Park Counties Above
9000 Feet-Grand and Summit Counties Below 9000 Feet-
Central and Southeast Park County-
Jefferson and West Douglas Counties Above 6000 Feet/Gilpin/Clear
Creek/Northeast Park Counties Below 9000 Feet-
814 PM MDT Tue Oct 8 2019

...RED FLAG WARNING REMAINS IN EFFECT FROM NOON TO 6 PM MDT
WEDNESDAY FOR WIND AND LOW RELATIVE HUMIDITY FOR THE CENTRAL
MOUNTAINS AND HIGH MOUNTAIN VALLEYS...AND THE SOUTHERN FRONT RANGE
FOOTHILLS...FIRE WEATHER ZONES 212...213...214...AND 216.

* Affected Area...Fire Weather Zones 212...213...214 and 216.

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

* Timing...Wednesday from Noon through 6pm.

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

* Impacts...Conditions will be favorable for the rapid ignition, 
  growth, and spread of fires.

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.

&&

$$

COZ241-247-091200-
/O.CON.KBOU.FW.W.0016.191009T1800Z-191010T0000Z/
Elbert/Central and East Douglas Counties Above 6000 Feet-
Southeast Elbert County Below 6000 Feet/South Lincoln County-
814 PM MDT Tue Oct 8 2019

...RED FLAG WARNING REMAINS IN EFFECT FROM NOON TO 6 PM MDT
WEDNESDAY FOR WIND AND LOW RELATIVE HUMIDITY FOR THE PALMER
DIVIDE AREA AND SOUTHERN LINCOLN COUNTY...

* Affected Area...Fire Weather Zones 241 and 247.

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

* Timing...Wednesday from Noon through 6pm MDT.

* Relative Humidity...As low as 10 percent.

* Impacts...Conditions will be favorable for the rapid ignition, 
  growth, and spread of fires.

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.

&&

$$
633 
WWUS85 KBOU 090957
RFWBOU

URGENT - FIRE WEATHER MESSAGE
National Weather Service Denver/Boulder CO
357 AM MDT Wed Oct 9 2019

...RED FLAG WARNING FOR THE CENTRAL MOUNTAINS AND HIGH VALLEYS...
SOUTHERN FRONT RANGE FOOTHILLS...AND PALMER DIVIDE NOON TO 6 PM
WEDNESDAY FOR GUSTY WINDS AND LOW HUMIDITY...FIRE WEATHER ZONES
212...213...214...216...241...AND 247...

.Gusty winds and low relative humidities are expected again this 
afternoon over the northern Colorado mountains, spreading out onto
the plains. The worst conditions will be along and south of 
Interstate 70.

COZ212>214-216-091800-
/O.CON.KBOU.FW.W.0016.191009T1800Z-191010T0000Z/
South and Southeast Grand/West Central and Southwest Boulder/
Gilpin/Clear Creek/Summit/North and West Park Counties Above
9000 Feet-Grand and Summit Counties Below 9000 Feet-
Central and Southeast Park County-
Jefferson and West Douglas Counties Above 6000 Feet/Gilpin/Clear
Creek/Northeast Park Counties Below 9000 Feet-
357 AM MDT Wed Oct 9 2019

...RED FLAG WARNING IN EFFECT FROM NOON TODAY TO 6 PM MDT THIS 
EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR THE CENTRAL 
MOUNTAINS AND HIGH MOUNTAIN VALLEYS...AND THE SOUTHERN FRONT RANGE
FOOTHILLS...FIRE WEATHER ZONES 212...213...214...AND 216.
 
* Affected Area...Fire Weather Zones 212...213...214 and 216.

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

* Timing...Wednesday from Noon through 6pm.

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

* Impacts...Conditions will be favorable for the rapid ignition, 
  growth, and spread of fires.

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.

&&

$$

COZ241-247-091800-
/O.CON.KBOU.FW.W.0016.191009T1800Z-191010T0000Z/
Elbert/Central and East Douglas Counties Above 6000 Feet-
Southeast Elbert County Below 6000 Feet/South Lincoln County-
357 AM MDT Wed Oct 9 2019

...RED FLAG WARNING REMAINS IN EFFECT FROM NOON TODAY TO 6 PM MDT
THIS EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR THE PALMER
DIVIDE AREA AND SOUTHERN LINCOLN COUNTY...

* Affected Area...Fire Weather Zones 241 and 247.

* Winds...Southwest 10 to 20 mph with gusts up to 30 mph.

* Timing...Wednesday from Noon through 6pm MDT.

* Relative Humidity...As low as 8 percent.

* Impacts...Conditions will be favorable for the rapid ignition, 
  growth, and spread of fires.

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
358 
WWUS85 KBOU 092126
RFWBOU

URGENT - FIRE WEATHER MESSAGE
National Weather Service Denver/Boulder CO
326 PM MDT Wed Oct 9 2019

...RED FLAG WARNING FOR THE CENTRAL MOUNTAINS AND HIGH VALLEYS...
SOUTHERN FRONT RANGE FOOTHILLS...AND PALMER DIVIDE UNTIL 6 PM 
WEDNESDAY FOR GUSTY WINDS AND LOW HUMIDITY...FIRE WEATHER ZONES 
212...213...214...216...241...AND 247...

.Gusty winds and low relative humidities will continue through the
rest of the afternoon. The worst conditions will be in the 
mountains.

COZ212>214-216-100000-
/O.CON.KBOU.FW.W.0016.000000T0000Z-191010T0000Z/
South and Southeast Grand/West Central and Southwest Boulder/
Gilpin/Clear Creek/Summit/North and West Park Counties Above
9000 Feet-Grand and Summit Counties Below 9000 Feet-
Central and Southeast Park County-
Jefferson and West Douglas Counties Above 6000 Feet/Gilpin/Clear
Creek/Northeast Park Counties Below 9000 Feet-
326 PM MDT Wed Oct 9 2019

...RED FLAG WARNING REMAINS IN EFFECT UNTIL 6 PM MDT THIS EVENING
FOR WIND AND LOW RELATIVE HUMIDITY FOR THE CENTRAL MOUNTAINS AND
HIGH MOUNTAIN VALLEYS...AND THE SOUTHERN FRONT RANGE FOOTHILLS...
FIRE WEATHER ZONES 212...213...214...AND 216...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

* Affected Area...Fire Weather Zones 212...213...214 and 216.

* Winds...Southwest 15 to 25 mph with gusts up to 35 mph.

* Timing...Wednesday from Noon through 6pm.

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

* Impacts...Conditions will be favorable for the rapid ignition, 
  growth, and spread of fires.

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.

&&

$$

COZ241-247-100000-
/O.CON.KBOU.FW.W.0016.000000T0000Z-191010T0000Z/
Elbert/Central and East Douglas Counties Above 6000 Feet-
Southeast Elbert County Below 6000 Feet/South Lincoln County-
326 PM MDT Wed Oct 9 2019

...RED FLAG WARNING REMAINS IN EFFECT UNTIL 6 PM MDT THIS EVENING
FOR WIND AND LOW RELATIVE HUMIDITY FOR THE PALMER DIVIDE AREA AND
SOUTHERN LINCOLN COUNTY...

* Affected Area...Fire Weather Zones 241 and 247.

* Winds...Southwest 10 to 15 mph with gusts up to 30 mph.

* Timing...Wednesday from Noon through 6pm MDT.

* Relative Humidity...As low as 8 percent.

* Impacts...Conditions will be favorable for the rapid ignition, 
  growth, and spread of fires.

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.

&&

$$
336 
WWUS85 KBOU 092356
RFWBOU

URGENT - FIRE WEATHER MESSAGE
National Weather Service Denver/Boulder CO
556 PM MDT Wed Oct 9 2019

COZ212>214-216-241-247-100100-
/O.CAN.KBOU.FW.W.0016.000000T0000Z-191010T0000Z/
South and Southeast Grand/West Central and Southwest Boulder/
Gilpin/Clear Creek/Summit/North and West Park Counties Above
9000 Feet-Grand and Summit Counties Below 9000 Feet-
Central and Southeast Park County-
Jefferson and West Douglas Counties Above 6000 Feet/Gilpin/Clear
Creek/Northeast Park Counties Below 9000 Feet-
Elbert/Central and East Douglas Counties Above 6000 Feet-
Southeast Elbert County Below 6000 Feet/South Lincoln County-
556 PM MDT Wed Oct 9 2019

...RED FLAG WARNING IS CANCELLED FOR THE CENTRAL MOUNTAINS AND 
HIGH VALLEYS...SOUTHERN FRONT RANGE FOOTHILLS...AND PALMER 
DIVIDE...

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

Temperatures have cooled, humidities have risen, and the threat of
dangerous fire behavior has diminished. A winter storm moving over
the state tonight will bring snow and colder temperatures to the 
mountains on Thursday.

$$

What forecasters said that day

The local office's own words before this red flag warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Denver/Boulder, CO wrote its last area forecast discussion before this red flag warning went out at Oct 7, 6:15 PM MDT, 10 hours 36 minutes earlier.

Area forecast discussion, Oct 7, 6:15 PM MDT, 10 hours 36 minutes before
Area Forecast Discussion
National Weather Service Denver/Boulder CO
615 PM MDT Mon Oct 7 2019

.UPDATE...
Issued at 607 PM MDT Mon Oct 7 2019

Only minor adjustments planned for the grids. The Red Flag Warning
that was in effect for today has been cancelled.

&&

.SHORT TERM...(This evening through Tuesday)
Issued at 144 PM MDT Mon Oct 7 2019

Very dry westerly zonal flow aloft will continue over Colorado
tonight and persist into Tuesday ahead of a tightening mid-level
height gradient associated with the next advancing cold trough
for later this week. With fire weather concerns in mind, ridge-top
winds this afternoon with occasional gusts of 25 to 35 mph over
the northern and central mountains will decrease slightly
overnight under a weak ridge axis before increasing again for
Tuesday in an environment of near single digit relative humidities
over the higher terrain. For the plains tonight, despite clear
skies and favorable light drainage, temperature are expected to be
warmer compared to last night with most locations across the
plains holding above the freezing mark.

Critical fire weather conditions will once again develop by midday
Tuesday over the northern mountains, northern foothills and high
parks as near ridge top winds gust to near 35mph with very low
relative humidity in the single digits. For the lower elevations,
dry, warm and stable conditions are expected for Tuesday. With
mid layer temps rising 4-8 degC over today's temps, the current
forecast highs of near 80 look on track. The record high for
Denver for October 8th is 85 degF set back in 1910, so at this
time that record should hold for another year.

.LONG TERM...(Tuesday night through Monday)
Issued at 144 PM MDT Mon Oct 7 2019

...Strong early season storm expected Wednesday night through
Thursday night, bringing potential record cold temperatures, snow
and wind...

Flow aloft will turn southwest and increase in speed Tuesday
night ahead of the advancing storm sinking into the Pacific
Northwest. This will keep above normal temperatures overnight with
mostly clear skies and gusty winds in the foothills as lee
surface pressure lowers.

Flow will continue to increase as the storm moves into the
Northern Rockies Wednesday, and a surface low is anticipated to
form and deepen over southeastern Colorado Wednesday. This will
bring another warm and breezy day to the forecast area, with fire
weather concerns shifting south due to the southwest winds
downsloping into the area. The associated cold front is expected
to push south into the forecast area Wednesday afternoon,
initially pretty dry but with strong winds and cold advection.
700mb temperatures are progged to drop 13 degrees C within about 6
hours, will likely see surface temperatures drop at least 20
degrees if not more with the frontal passage. Southwest flow
aloft will continue to increase in speed as the jet of the system
moves into the state overnight. Dynamic lift will begin
precipitation - likely to be all snow due to the really cold air
associated with this system. Surface temperatures will fall below
freezing Wednesday evening and will likely stay that way through
Friday. After our warm start to the week, this could spell
trouble for roads, as snow falling will melt on the roads then
freeze quickly due to the cold temperatures.

The best lift will occur Thursday as the upper low moves east
across Wyoming, with most of the snow accumulation expected during
the day. As the jet moves overhead over Colorado, snow banding is
expected with this system, bringing localized heavier amounts. At
this time, models are in reasonably good agreement with the system
still being 60 to 90 hours out from now. GFS is slightly quicker
with the system than the rest of the models, so will likely hold
on to a chance of snow past midnight Thursday night to hedge
toward the other models. Expected snow amounts of 2 to 5 inches
across the plains, 4 to 10 inches expected across the higher
terrain. There isn't any really good upslope flow into the
foothills, slightly better over the Palmer Divide. Another concern
with this storm will be the trees in the area, still with leaves
and not dormant. Accumulating snow could harm or break branches,
posing a threat to powerlines. Northerly winds behind the front
and through the day Thursday will easily mix down to the surface,
with gust speeds of 20 to 40 mph not out of the question. Lows on
Thursday night will likely fall into the teens to single digits,
and likely break low temperature records. All extended MOS
guidance has readings breaking the low record for the Denver area,
with its 90th percentiles even breaking the record. Precautions
should be taken with outdoor plumbing.

The system will push east for Friday leaving cool temperatures in
northwest flow aloft. Skies should be sunny to help warm the cold
airmass. Depending on how much snow falls, may need to lower
temperatures from guidance. Expect a warmer day Saturday as a
ridge transitions across the area with Sunday and Monday temperature
readings back to normal for this time of year.

&&

.AVIATION...(For the 18Z TAFS through 18Z Tuesday afternoon)
Issued at 610 PM MDT Mon Oct 7 2019

VFR with typical drainage winds expected overnight. Continued dry
and stable conditions will persist into Tuesday with a transition
of surface winds back over to daytime easterlies by midday.

&&

.FIRE WEATHER...
Issued at 607 PM MDT Mon Oct 7 2019

Very dry moderate westerly flow aloft will persist over Colorado
through Tuesday. After cooler temperatures and rapid relative
humidity recovery tonight, temperatures will become slightly
warmer for Tuesday with relative humidities expected to drop into
the the single digits over the higher terrain areas. After
slightly weaker ridge-top winds overnight, winds will again pulse
higher for Tuesday with gusts to 35 mph over the mountains during
the afternoon hours.

As southwest flow increases Wednesday ahead of the expected cold
front and snow storm of Wednesday night through Thursday night,
warm, dry and windy conditions will continue, but shift the focus
more south. The mountains, high valleys, foothills and Palmer
Divide area will possibly see the critical fire weather conditions
Wednesday afternoon. Winds will be stronger Wednesday, but
humidity will be a little wetter than the previous two days.
Therefore a Fire Weather Watch will be in effect Wednesday
afternoon.

&&

.BOU WATCHES/WARNINGS/ADVISORIES...
Fire Weather Watch Wednesday afternoon for COZ212>214-216-241-
247.

Red Flag Warning from 10 AM to 6 PM MDT Tuesday for COZ211-215-
217-218.

&&

UPDATE...Cooper
SHORT TERM...Fredin
LONG TERM...Kriederman
AVIATION...Fredin
FIRE WEATHER...Cooper
Hazardous weather outlook, Oct 7, 10:56 AM MDT, 17 hours 55 minutes before
Hazardous Weather Outlook
National Weather Service Denver/Boulder CO
1056 AM MDT Mon Oct 7 2019

COZ030>051-081700-
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-
1056 AM MDT Mon Oct 7 2019

...CRITICAL FIRE WEATHER CONDITIONS TODAY THROUGH WEDNESDAY...

...A STRONG EARLY SEASON SNOW STORM TO IMPACT THE AREA WEDNESDAY
NIGHT THROUGH THURSDAY NIGHT...

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

.DAY ONE...Today and Tonight

Dry conditions will persist across the region today with above
seasonal temperatures expected. The fire danger will remain
elevated this afternoon with critical fire weather conditions
expected over the higher northern mountains, northern foothills
and northern high valleys due to very low humidity and gusty winds
to 35 mph.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday

Low humidity, gusty winds and warm temperatures will continue
critical fire weather conditions across the northern mountains,
northern foothills Tuesday, then shifting south over the north-
central mountains and southern foothills and Palmer Divide
Wednesday afternoon.

Much colder unsettled weather is expected from late Wednesday
through Friday, with snow likely across north central and
northeastern Colorado. Denver should see its first snow of the
season Wednesday night or Thursday. Temperatures will fall below
freezing Wednesday night, likely remaining below freezing through
Thursday, with a hard freeze Friday morning. Roads may ice up
initially due to really warm temperatures of late. Trees have yet
to go dormant with leaves still on, snow could end up
breaking/damaging branches.

People should start to prepare now, with digging out winter wear,
wintertime emergency kits for cars and reviewing their winter
driving tips.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be needed today or tonight.

The office that day

Everything else NWS Denver/Boulder, CO issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Oct 8, 3:06 PM MDTFreeze WatchBOUAdams, Arapahoe, Boulder, Broomfield, Denver, Douglas and 6 more13 hr

Nearby

Red Flag Warnings in Colorado, 2019Every red flag warning in 2019

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.