Alert archive / Colorado / Red Flag Warnings in 2018

Red Flag Warning 32, NWS Denver/Boulder, CO

June 27, 201811 counties in Colorado

NWS Denver/Boulder, CO issued this red flag warning at Jun 27, 2018, 3:39 AM MDT for 11 counties in Colorado. It took effect at Jun 28, 2018, 11:00 AM MDT. It was in force for 11 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Jun 27, 2018, 3:39 AM MDT (09:39 UTC)
In effect from
Jun 28, 2018, 11:00 AM MDT
Expired
Jun 28, 2018, 9:30 PM MDT
In force
11 hr
Issued by
NWS Denver/Boulder, CO

Counties Boulder County, CO, Clear Creek County, CO, Douglas County, CO, Gilpin County, CO, Grand County, CO, Jackson County, CO, Jefferson County, CO, Larimer County, CO, Park County, CO, Summit County, CO, Weld County, CO

The radar

The Denver radar (KFTG), 86 km from the middle of the area, began a volume at 09:40 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.

The nearest sounding before it

Denver, CO (KDEN), launched 00:00Z, 9.7 hours before the alert went out and 196 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 2018-06-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 174 joules per kilogram.LCLEL10008507005003002001001 km2 km3 km6 km9 km12 km15 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 2018-06-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 44 square meters per square second.193958Sfc1 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
174 J/kg
Mixed-layer CIN
-6 J/kg
Mixed-layer LCL
4447 m above ground
0-6 km bulk shear
41 kt
0-1 km storm-relative helicity
44 m²/s²
0-3 km storm-relative helicity
76 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.2

Open this sounding in Storm Lab

The text

As transmitted.

612 
WWUS85 KBOU 270939
RFWBOU

URGENT - FIRE WEATHER MESSAGE
National Weather Service Denver/Boulder CO
339 AM MDT Wed Jun 27 2018


COZ211-213>215-217-238-271745-
/O.UPG.KBOU.FW.A.0018.180628T1700Z-180629T0300Z/
/O.NEW.KBOU.FW.W.0032.180628T1700Z-180629T0300Z/
Jackson County Below 9000 Feet-
Grand and Summit Counties Below 9000 Feet-
Central and Southeast Park County-
Larimer and Boulder Counties Between 6000 and 9000 Feet-
West Jackson and West Grand Counties Above 9000 Feet-
Larimer County Below 6000 Feet/Northwest Weld County-
339 AM MDT Wed Jun 27 2018

...RED FLAG WARNING IN EFFECT FROM 11 AM TO 9 PM MDT THURSDAY FOR
WIND AND LOW RELATIVE HUMIDITY FOR THE NORTHERN FRONT RANGE 
FOOTHILLS AND NEARBY PLAINS, THE PARK RANGE, AND THE HIGH 
MOUNTAIN VALLEYS OF NORTH CENTRAL COLORADO...

The National Weather Service in Denver has issued a Red Flag
Warning FOR WIND AND LOW RELATIVE HUMIDITY, which is in effect
from 11 AM to 9 PM MDT Thursday. The Fire Weather Watch is no
longer in effect.

* Affected Area...Fire Weather Zones 211...213...214...215... 
  217 and 238.

* Timing...11 AM MDT to 9 PM MDT Thursday

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

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

* Impacts...Rapid fire growth and spread will be possible under 
  these hot, dry and breezy conditions.

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.

&&

$$
6 follow-up statements
272 
WWUS85 KBOU 271910
RFWBOU

URGENT - FIRE WEATHER MESSAGE
National Weather Service Denver/Boulder CO
110 PM MDT Wed Jun 27 2018


COZ211-213>215-217-238-281100-
/O.CON.KBOU.FW.W.0032.180628T1700Z-180629T0300Z/
Jackson County Below 9000 Feet-
Grand and Summit Counties Below 9000 Feet-
Central and Southeast Park County-
Larimer and Boulder Counties Between 6000 and 9000 Feet-
West Jackson and West Grand Counties Above 9000 Feet-
Larimer County Below 6000 Feet/Northwest Weld County-
110 PM MDT Wed Jun 27 2018

...RED FLAG WARNING REMAINS IN EFFECT FROM 11 AM TO 9 PM MDT
THURSDAY FOR WIND AND LOW RELATIVE HUMIDITY FOR THE NORTHERN
FRONT RANGE FOOTHILLS AND NEARBY PLAINS, THE PARK RANGE, AND THE
HIGH MOUNTAIN VALLEYS OF NORTH CENTRAL COLORADO...

* Affected Area...Fire Weather Zones 211...213...214...215... 
  217 and 238.

* Timing...11 AM MDT to 9 PM MDT Thursday

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

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

* Impacts...Rapid fire growth and spread will be possible under 
  these hot, dry and breezy conditions.

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.

&&

$$
048 
WWUS85 KBOU 272214
RFWBOU

URGENT - FIRE WEATHER MESSAGE
National Weather Service Denver/Boulder CO
414 PM MDT Wed Jun 27 2018


COZ218-281100-
/O.EXA.KBOU.FW.W.0032.180628T1700Z-180629T0300Z/
South and East Jackson/Larimer/North and Northeast Grand/
Northwest Boulder Counties Above 9000 Feet-
414 PM MDT Wed Jun 27 2018

...RED FLAG WARNING IN EFFECT FROM 11 AM TO 9 PM MDT THURSDAY FOR
WIND AND LOW RELATIVE HUMIDITY FOR THE MEDICINE BOW AND FRONT 
RANGE MOUNTAINS ABOVE 9000 FEET IN LARIMER, GRAND AND NORTHWEST 
BOULDER COUNTIES...

The National Weather Service in Denver has issued a Red Flag
Warning FOR WIND AND LOW RELATIVE HUMIDITY, which is in effect
from 11 AM to 9 PM MDT Thursday.

* Affected Area...Fire Weather Zone 218.

* Timing...11 AM MDT to 9 PM MDT Thursday

* Winds...Southwest 10 to 25 mph with gusts up to 35 mph.

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

* Impacts...Rapid fire growth and spread will be possible under 
  these hot, dry and breezy conditions.

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>215-217-238-281100-
/O.CON.KBOU.FW.W.0032.180628T1700Z-180629T0300Z/
Jackson County Below 9000 Feet-
Grand and Summit Counties Below 9000 Feet-
Central and Southeast Park County-
Larimer and Boulder Counties Between 6000 and 9000 Feet-
West Jackson and West Grand Counties Above 9000 Feet-
Larimer County Below 6000 Feet/Northwest Weld County-
414 PM MDT Wed Jun 27 2018

...RED FLAG WARNING REMAINS IN EFFECT FROM 11 AM TO 9 PM MDT
THURSDAY FOR WIND AND LOW RELATIVE HUMIDITY FOR THE NORTHERN
FRONT RANGE FOOTHILLS AND NEARBY PLAINS, THE PARK RANGE, AND THE
HIGH MOUNTAIN VALLEYS OF NORTH CENTRAL COLORADO...

* Affected Area...Fire Weather Zones 211...213...214...215... 
  217 and 238.

* Timing...11 AM MDT to 9 PM MDT Thursday

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

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

* Impacts...Rapid fire growth and spread will be possible under 
  these hot, dry and breezy conditions.

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.

&&

$$
008 
WWUS85 KBOU 281037
RFWBOU

URGENT - FIRE WEATHER MESSAGE
National Weather Service Denver/Boulder CO
437 AM MDT Thu Jun 28 2018

...EXTREME FIRE DANGER IN THE MOUNTAINS TODAY...

.Very hot and very dry conditions today will combine with wind
gusts of 25 to 35 mph to produce extreme fire danger across the
northern Colorado mountains this afternoon and evening. The fire
danger will also be elevated on the plains, but the winds will not
be as strong. Conditions will not be as extreme on Friday, but
fire danger will still be very high, especially in the mountain
valleys. 

Please pay attention to restrictions on fires and fireworks. Check
with your local fire department, sheriff, or land managers for
details on what is allowed.

COZ212-216-281845-
/O.EXB.KBOU.FW.W.0032.180628T1700Z-180629T0600Z/
South and Southeast Grand/West Central and Southwest Boulder/
Gilpin/Clear Creek/Summit/North and West Park Counties Above
9000 Feet-
Jefferson and West Douglas Counties Above 6000 Feet/Gilpin/Clear
Creek/Northeast Park Counties Below 9000 Feet-
437 AM MDT Thu Jun 28 2018

...RED FLAG WARNING IN EFFECT FROM 11 AM THIS MORNING TO MIDNIGHT
MDT TONIGHT FOR WIND AND LOW RELATIVE HUMIDITY FOR THE CENTRAL
COLORADO MOUNTAINS AND 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 11 AM this morning to midnight MDT tonight.

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

* Timing...11 AM MDT to 9 PM MDT Thursday

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

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

* Impacts...Rapid fire growth and spread will be possible under 
  these hot, dry and breezy conditions.

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.

&&

$$

COZ211-213-214-281845-
/O.NEW.KBOU.FW.A.0019.180629T1700Z-180630T0300Z/
/O.EXT.KBOU.FW.W.0032.180628T1700Z-180629T0600Z/
Jackson County Below 9000 Feet-
Grand and Summit Counties Below 9000 Feet-
Central and Southeast Park County-
437 AM MDT Thu Jun 28 2018

...RED FLAG WARNING NOW IN EFFECT FROM 11 AM THIS MORNING TO
MIDNIGHT MDT TONIGHT FOR WIND AND LOW RELATIVE HUMIDITY FOR THE
NORTHERN FRONT RANGE FOOTHILLS AND NEARBY PLAINS, THE PARK RANGE,
AND THE HIGH MOUNTAIN VALLEYS OF NORTH CENTRAL COLORADO...

...FIRE WEATHER WATCH IN EFFECT FROM FRIDAY MORNING THROUGH
FRIDAY EVENING FOR WIND AND LOW RELATIVE HUMIDITY...

The National Weather Service in Denver has issued a Fire Weather 
Watch FOR WIND AND LOW RELATIVE HUMIDITY, which is in effect from 
Friday morning through Friday evening.

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

* Timing...11 AM MDT to 9 PM MDT Thursday

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

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

* Impacts...Rapid fire growth and spread will be possible under 
  these hot, dry and breezy conditions.

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.

A Fire Weather Watch means that critical fire weather conditions
are forecast to occur. Listen for later forecasts and possible
Red Flag Warnings.

&&

$$

COZ215-217-218-238-281845-
/O.EXT.KBOU.FW.W.0032.180628T1700Z-180629T0600Z/
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-
Larimer County Below 6000 Feet/Northwest Weld County-
437 AM MDT Thu Jun 28 2018

...RED FLAG WARNING NOW IN EFFECT FROM 11 AM THIS MORNING TO
MIDNIGHT MDT TONIGHT FOR WIND AND LOW RELATIVE HUMIDITY FOR THE
MEDICINE BOW AND FRONT RANGE MOUNTAINS ABOVE 9000 FEET IN
LARIMER, GRAND AND NORTHWEST BOULDER COUNTIES...

* Affected Area...Fire Weather Zones 215...217...218 and 238.

* Timing...11 AM MDT to 9 PM MDT Thursday

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

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

* Impacts...Rapid fire growth and spread will be possible under 
  these hot, dry and breezy conditions.

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/RJK
677 
WWUS85 KBOU 281419
RFWBOU

URGENT - FIRE WEATHER MESSAGE
National Weather Service Denver/Boulder CO
819 AM MDT Thu Jun 28 2018

...EXTREME FIRE DANGER IN THE MOUNTAINS TODAY...

.Very hot and very dry conditions today will combine with wind
gusts of 25 to 35 mph to produce extreme fire danger across the
northern Colorado mountains this afternoon and evening. The fire
danger will also be elevated on the plains, but the winds will
not be as strong. Conditions will not be as extreme on Friday,
but fire danger will still be very high, especially in the
mountain valleys.

Please pay attention to restrictions on fires and fireworks.
Check with your local fire department, sheriff, or land managers
for details on what is allowed.

COZ211-213-214-290000-
/O.CON.KBOU.FW.W.0032.180628T1700Z-180629T0600Z/
/O.CON.KBOU.FW.A.0019.180629T1700Z-180630T0300Z/
Jackson County Below 9000 Feet-
Grand and Summit Counties Below 9000 Feet-
Central and Southeast Park County-
819 AM MDT Thu Jun 28 2018

...RED FLAG WARNING REMAINS IN EFFECT UNTIL MIDNIGHT MDT TONIGHT
FOR WIND AND LOW RELATIVE HUMIDITY FOR THE NORTHERN FRONT RANGE
FOOTHILLS AND NEARBY PLAINS, THE PARK RANGE, AND THE HIGH
MOUNTAIN VALLEYS OF NORTH CENTRAL COLORADO...

...FIRE WEATHER WATCH REMAINS IN EFFECT FROM FRIDAY MORNING
THROUGH FRIDAY EVENING FOR WIND AND LOW RELATIVE HUMIDITY...

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

* Timing...11 AM MDT to midnight Thursday evening, then again 
  late Friday morning through Friday evening.

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

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

* Impacts...Rapid fire growth and spread will be possible under 
  these hot, dry and breezy conditions.

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.

A Fire Weather Watch means that critical fire weather conditions
are forecast to occur. Listen for later forecasts and possible
Red Flag Warnings.

&&

$$

COZ212-215>218-238-290000-
/O.CON.KBOU.FW.W.0032.180628T1700Z-180629T0600Z/
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-
West Jackson and West Grand Counties Above 9000 Feet-
South and East Jackson/Larimer/North and Northeast Grand/
Northwest Boulder Counties Above 9000 Feet-
Larimer County Below 6000 Feet/Northwest Weld County-
819 AM MDT Thu Jun 28 2018

...RED FLAG WARNING REMAINS IN EFFECT UNTIL MIDNIGHT MDT TONIGHT
FOR WIND AND LOW RELATIVE HUMIDITY FOR THE MEDICINE BOW AND FRONT
RANGE MOUNTAINS ABOVE 9000 FEET IN LARIMER, GRAND AND NORTHWEST
BOULDER COUNTIES...

* Affected Area...Fire Weather Zones 212...215...216...217... 
  218 and 238.

* Timing...11 AM MDT to midnight Thursday evening.

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

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

* Impacts...Rapid fire growth and spread will be possible under 
  these hot, dry and breezy conditions.

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.

&&

$$
842 
WWUS85 KBOU 282042
RFWBOU

URGENT - FIRE WEATHER MESSAGE
National Weather Service Denver/Boulder CO
242 PM MDT Thu Jun 28 2018

...EXTREME FIRE DANGER IN THE MOUNTAINS TODAY...

.Very hot and very dry conditions with wind gusts of 25 to 40 mph
will continue to produce extreme fire danger across the northern 
Colorado mountains this afternoon and evening. The fire danger 
will also be elevated on the plains. In addition, isolated high 
based showers and thunderstorms will produce wind gusts to 50 mph
and possibly dry lightning. Little to no rainfall is expected. 

Conditions will not be as extreme on Friday, but fire danger will
still be very high, especially in the mountains and mountain 
valleys where winds will gust to 30 mph.

Please pay attention to restrictions on fires and fireworks.
Check with your local fire department, sheriff, or land managers
for details on what is allowed.

COZ211-213-214-291200-
/O.UPG.KBOU.FW.A.0019.180629T1700Z-180630T0300Z/
/O.NEW.KBOU.FW.W.0033.180629T1700Z-180630T0300Z/
/O.CON.KBOU.FW.W.0032.000000T0000Z-180629T0600Z/
Jackson County Below 9000 Feet-
Grand and Summit Counties Below 9000 Feet-
Central and Southeast Park County-
242 PM MDT Thu Jun 28 2018

...RED FLAG WARNING REMAINS IN EFFECT UNTIL MIDNIGHT MDT TONIGHT
FOR WIND AND LOW RELATIVE HUMIDITY FOR NORTH, MIDDLE, AND SOUTH 
PARKS...

...RED FLAG WARNING IN EFFECT FROM 11 AM TO 9 PM MDT FRIDAY FOR
WIND AND LOW RELATIVE HUMIDITY FOR NORTH, MIDDLE, AND SOUTH 
PARKS...

The National Weather Service in Denver has issued a Red Flag
Warning FOR WIND AND LOW RELATIVE HUMIDITY, which is in effect
from 11 AM to 9 PM MDT Friday. The Fire Weather Watch is no
longer in effect.

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

* Timing...11 AM MDT to midnight Thursday evening, then again 
  late Friday morning through Friday evening.

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

* Relative Humidity...As low as 5 percent.

* Impacts...Rapid fire growth and spread will be possible under 
  these hot, dry and breezy conditions.

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.

&&

$$

COZ217-218-291200-
/O.NEW.KBOU.FW.W.0033.180629T1700Z-180630T0300Z/
/O.CON.KBOU.FW.W.0032.000000T0000Z-180629T0600Z/
West Jackson and West Grand Counties Above 9000 Feet-
South and East Jackson/Larimer/North and Northeast Grand/
Northwest Boulder Counties Above 9000 Feet-
242 PM MDT Thu Jun 28 2018

...RED FLAG WARNING REMAINS IN EFFECT UNTIL MIDNIGHT MDT TONIGHT
FOR WIND AND LOW RELATIVE HUMIDITY FOR THE MOUNTAINS OF NORTH
CENTRAL COLORADO...

...RED FLAG WARNING IN EFFECT FROM 11 AM TO 9 PM MDT FRIDAY FOR
WIND AND LOW RELATIVE HUMIDITY FOR THE MOUNTAINS OF NORTH CENTRAL
COLORADO...

The National Weather Service in Denver has issued a Red Flag
Warning FOR WIND AND LOW RELATIVE HUMIDITY, which is in effect
from 11 AM to 9 PM MDT Friday.

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

* Timing...11 AM MDT to midnight Thursday evening, then again 
  late Friday morning through Friday evening.

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

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

* Impacts...Rapid fire growth and spread will be possible under 
  these hot, dry and breezy conditions.

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.

&&

$$

COZ212-215-216-238-290600-
/O.CON.KBOU.FW.W.0032.000000T0000Z-180629T0600Z/
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-
Larimer County Below 6000 Feet/Northwest Weld County-
242 PM MDT Thu Jun 28 2018

...RED FLAG WARNING REMAINS IN EFFECT UNTIL MIDNIGHT MDT TONIGHT
FOR WIND AND LOW RELATIVE HUMIDITY FOR THE FOOTHILLS, LARIMER AND
NORTHWEST WELD COUNTIES, AND THE MOUNTAINS AROUND I-70...

* Affected Area...Fire Weather Zones 212...215...216 and 238.

* Timing...11 AM MDT to midnight Thursday evening.

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

* Relative Humidity...As low as 5 percent.

* Impacts...Rapid fire growth and spread will be possible under 
  these hot, dry and breezy conditions.

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.

&&

$$
114 
WWUS85 KBOU 290330
RFWBOU

URGENT - FIRE WEATHER MESSAGE
National Weather Service Denver/Boulder CO
930 PM MDT Thu Jun 28 2018

...EXTREME FIRE DANGER IN THE MOUNTAINS AGAIN FRIDAY...

.Temperatures have cooled this evening along with diminishing
winds. This has offered some relief from the extreme fire danger
levels earlier today. Humidity recoveries are still expected to 
be poor overnight. The Red Flag Warning for this evening has been 
cancelled. 

Very hot and very dry conditions with wind gusts of 20 to 35 mph 
are expected again Friday which will produce extreme fire danger 
across the northern and central Colorado mountains Friday 
afternoon and evening. 

Please pay attention to restrictions on fires and fireworks. 
Check with your local fire department, sheriff, or land managers 
for details on what is allowed.

COZ211-213-214-217-218-291130-
/O.CAN.KBOU.FW.W.0032.000000T0000Z-180629T0600Z/
/O.CON.KBOU.FW.W.0033.180629T1700Z-180630T0300Z/
Jackson County Below 9000 Feet-
Grand and Summit Counties Below 9000 Feet-
Central and Southeast Park County-
West Jackson and West Grand Counties Above 9000 Feet-
South and East Jackson/Larimer/North and Northeast Grand/
Northwest Boulder Counties Above 9000 Feet-
930 PM MDT Thu Jun 28 2018

...RED FLAG WARNING REMAINS IN EFFECT FROM 11 AM TO 9 PM MDT
FRIDAY FOR WIND AND LOW RELATIVE HUMIDITY FOR THE MOUNTAINS OF
NORTH CENTRAL COLORADO...
...RED FLAG WARNING FOR TONIGHT IS CANCELLED FOR WIND AND LOW 
RELATIVE HUMIDITY FOR THE MOUNTAINS OF NORTH CENTRAL COLORADO...

* Affected Area...Fire Weather Zones 211...213...214...217 and 
  218.

* Timing...Late Friday morning through Friday evening.

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

* Relative Humidity...As low as 7 percent.

* Impacts...Rapid fire growth and spread will be possible under 
  these hot, dry and breezy conditions.

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.

&&

$$

COZ212-291130-
/O.CAN.KBOU.FW.W.0032.000000T0000Z-180629T0600Z/
/O.EXA.KBOU.FW.W.0033.180629T1700Z-180630T0300Z/
South and Southeast Grand/West Central and Southwest Boulder/
Gilpin/Clear Creek/Summit/North and West Park Counties Above
9000 Feet-
930 PM MDT Thu Jun 28 2018

...RED FLAG WARNING IN EFFECT FROM 11 AM TO 9 PM MDT FRIDAY FOR
WIND AND LOW RELATIVE HUMIDITY FOR THE MOUNTAINS AROUND I-70... 
...RED FLAG WARNING TONIGHT IS CANCELLED FOR WIND AND LOW 
RELATIVE HUMIDITY FOR THE MOUNTAINS AROUND I-70...

The National Weather Service in Denver has issued a Red Flag
Warning FOR WIND AND LOW RELATIVE HUMIDITY, which is in effect
from 11 AM to 9 PM MDT Friday. 

* Affected Area...Fire Weather Zone 212.

* Timing...Late Friday morning through Friday evening. 

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

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

* Impacts...Rapid fire growth and spread will be possible under 
  these hot, dry and breezy conditions.

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.

&&

$$

COZ215-216-238-290430-
/O.CAN.KBOU.FW.W.0032.000000T0000Z-180629T0600Z/
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-
Larimer County Below 6000 Feet/Northwest Weld County-
930 PM MDT Thu Jun 28 2018

...RED FLAG WARNING FOR TONIGHT IS CANCELLED FOR WIND AND LOW 
RELATIVE HUMIDITY FOR THE FOOTHILLS, LARIMER AND NORTHWEST WELD 
COUNTIES...

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

As temperatures have cooled this evening, relative humidity levels
have slowly increased. Winds have also diminished, helping to
reduce the fire danger levels and fire behaviors. Humidity
recovery is still expected to be poor overnight. 

$$

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 Jun 26, 11:35 PM MDT, 4 hours 4 minutes earlier.

Area forecast discussion, Jun 26, 11:35 PM MDT, 4 hours 4 minutes before
Area Forecast Discussion
National Weather Service Denver/Boulder CO
1135 PM MDT Tue Jun 26 2018

.UPDATE...
Issued at 831 PM MDT Tue Jun 26 2018

Benign pattern tonight. No changes planned in the grids, current
forecast on track.

&&

.SHORT TERM...(This evening through Wednesday)
Issued at 204 PM MDT Tue Jun 26 2018

A mid to upper level ridge has continued to build over New Mexico
today and subsidence from this will lead to dry conditions
tonight. Low temperatures will stay a few degrees above normal as
winds will remain light. Forecast highs on Wednesday are still on track to
be near records especially along the urban corridor.

The focus then shifts to the positioning of a shallow cold front
that will bring dew points in the upper 50s to low 60s into
northeast Colorado late tonight and into Wednesday. Models tend to
struggle in these scenarios so confidence will be low concerning
the intensity and coverage of thunderstorms tomorrow. If this
moisture were to push up into the foothills, scattered strong to
severe thunderstorms would be possible from the urban corridor to
the eastern plains. These storms would be aided by good mixed
layer CAPE of near 2500 J/kg along with sufficient 0-6km bulk
shear of 30-35 knots according to the NAM. With this scenario
possible, I tend to agree with SPC adding a marginal risk area
across northeast Colorado. Storms that do develop could produce
large hail due to nearly dry adiabatic mid level lapse rates as
well as gusty winds as forecast soundings show a bit of an
inverted-V structure. However, it is also possible that the
shallow moisture mixes out tomorrow afternoon and showers and
storms will stay weaker and isolated in nature. With that being
said, I have increased POPs tomorrow afternoon and evening to
account for the first scenario.

.LONG TERM...(Wednesday night through Tuesday)
Issued at 204 PM MDT Tue Jun 26 2018

Hot upper level ridge over Colorado will shift east of the state on
Thursday. This will cause the light westerly flow aloft to turn
southwesterly and become stronger through the day. Near record the
high temperatures and low relative humidities has prompted a fire
weather watch for the northern Front range foothills and nearby
plains, and high mountain valleys. The watch will run from late
Thursday morning until mid-evening on Thursday. Friday will be not
quite as hot with an upper level trough moving in from the west.
However, gusty southwest winds and low relative humidities will keep
the fire danger high in the areas mainly along and west of the
Continental Divide. East of the Divide, a morning cold front will
bring slightly cooler temperatures and higher humidities to the
plains, as well as a slight chance of late day storms. This cooling
trend will continue over the weekend, along with a better chance for
the thunderstorms and wetting rainfall with passage of the upper
level trough.

&&

.AVIATION...(For the 06Z TAFS through 06Z Wednesday night)
Issued at 1128 PM MDT Tue Jun 26 2018

VFR clear through the period. Wind direction the big issue, mainly
southerly drainage wind tonight, then a brief period 15-18z where
they shift around to the north then veer east then south by the
end of the day. Slight chance of thunderstorms late afternoon but
not big enough numbers to include in the forecast.

&&

.FIRE WEATHER...
Issued at 204 PM MDT Tue Jun 26 2018

Fire danger will be elevated tomorrow due to hot temperatures and
low RHs. But due to the lighter winds, no highlights are anticipated
on Wednesday.

Hot temperatures, very low relative humidities, a high Haines Index,
and gusty southwest winds may combine with the dry fuels to create
high to extreme fire behavior conditions the mountain valleys, the
Park Range, the northern Front Range foothills and nearby plains on
Thursday. As a result, a Fire Weather Watch has been issued for
Thursday. The critical fire weather conditions should start to improve
gradually by mid evening with decreasing temperatures and rising
humidities.

Increasing southwest flow aloft ahead of an approaching upper level
trough will warm temperatures even more, and lower relative
humidities across the forecast area. However, the stronger winds
are expected to be confined to the northern mountains, high
mountain valleys and the northern Front Range Foothills.

Could see a repeat of these conditions in about the same area on
Friday, although temperatures are not expected to be as warm.

&&

.BOU WATCHES/WARNINGS/ADVISORIES...
Fire Weather Watch from Thursday morning through Thursday
evening for COZ211-213>215-217-238.

&&

UPDATE...Cooper
SHORT TERM...Danielson
LONG TERM...Baker
AVIATION...Hanson
FIRE WEATHER...Baker
Hazardous weather outlook, Jun 26, 11:14 AM MDT, 16 hours 25 minutes before
Hazardous Weather Outlook
National Weather Service Denver/Boulder CO
1114 AM MDT Tue Jun 26 2018

COZ030>051-270515-
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-
1114 AM MDT Tue Jun 26 2018

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

.DAY ONE...This Afternoon and Tonight

No hazardous weather is expected at this time. Hot weather will
be the rule today, with highs on the plains reaching well into the
90s and the mountains seeing temperatures in the 80s. Hot
temperatures and low humidity will combine to elevate fire danger.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday

It will remain hot and dry through Friday with the hottest
temperatures expected on Thursday. Many locations on the plains
could reach or surpass the 100 degree mark Thursday afternoon.
Isolated high-based thunderstorms late Wednesday afternoon and
evening could produce a few sprinkles, wind gusts and perhaps a
lightning strike or two. The near record hot temperatures, low
humidity and somewhat stronger winds on Thursday will further
increase the fire danger in many areas. An upper level trough and
associated cold front will bring a respite from the heat by the
weekend with a chance of showers and thunderstorms mainly for the
high plains.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be needed today or tonight.

Meier/Baker

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 27, 4:49 PM MDTSevere Thunderstorm WarningBOUAdams, Denver, Weld26 min
Jun 27, 5:24 PM MDTSpecial Weather StatementBOUDenver36 min

Nearby

Red Flag Warnings in Colorado, 2018Every red flag warning in 2018

Sources

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