Alert archive / Wyoming / Red Flag Warnings in 2021

Red Flag Warning 30, NWS Cheyenne, WY

September 9, 2021

NWS Cheyenne, WY issued this red flag warning at Sep 9, 2021, 7:55 PM MDT. It took effect at Sep 10, 2021, 10:00 AM MDT. It was in force for 10 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: Sep 9, 2021, 7:55 PM MDT (01:55 UTC)
In effect from: Sep 10, 2021, 10:00 AM MDT
Expired: Sep 10, 2021, 8:00 PM MDT
In force: 10 hr
Issued by: NWS Cheyenne, WY

The text

As transmitted.

548 
WWUS85 KCYS 100155
RFWCYS

URGENT - FIRE WEATHER MESSAGE
National Weather Service Cheyenne WY
755 PM MDT Thu Sep 9 2021

...RED FLAG WARNING IN EFFECT FOR GUSTY WINDS AND LOW HUMIDITY
FRIDAY FOR FWZ 301...302...303 AND NORTHERN 308...

WYZ301-101200-
/O.EXP.KCYS.FW.W.0029.000000T0000Z-210910T0200Z/
/O.UPG.KCYS.FW.A.0028.210910T1600Z-210911T0200Z/
/O.NEW.KCYS.FW.W.0030.210910T1600Z-210911T0200Z/
Niobrara/Lower Elevations of Converse/Thunder Basin National
Grassland-
755 PM MDT Thu Sep 9 2021

...RED FLAG WARNING IN EFFECT FROM 10 AM TO 8 PM MDT FRIDAY FOR
GUSTY WINDS AND LOW HUMIDITY...

...RED FLAG WARNING WILL EXPIRE AT 8 PM MDT THIS EVENING FOR 
GUSTY WINDS AND LOW HUMIDITY FOR FIRE WEATHER ZONE 301...

The National Weather Service in Cheyenne has issued a Red Flag
Warning, which is in effect from 10 AM to 8 PM MDT Friday. The
Fire Weather Watch is no longer in effect. 

* WIND...West to northwest winds 15 to 25 mph with gusts to 35
  mph. 

* HUMIDITY...8 to 12 percent.

* HAINES...6.

* IMPACTS...any fires that develop will likely spread rapidly. 
  Outdoor burning is not recommended.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&


$$

NEZ311-100300-
/O.EXP.KCYS.FW.W.0029.000000T0000Z-210910T0200Z/
Pine Ridge/Nebraska National Forest/Oglala National Grasslands-
755 PM MDT Thu Sep 9 2021

...RED FLAG WARNING WILL EXPIRE AT 8 PM MDT THIS EVENING FOR
GUSTY WINDS AND LOW HUMIDITY FOR FIRE WEATHER ZONE 311...

Winds have eased and are no longer expected to be critical.
Evening humidity is slowly recovering. Thus the Red Flag Warning 
will be allowed to expire on time at 8 PM.

$$

WYZ302-303-308-101200-
/O.UPG.KCYS.FW.A.0028.210910T1600Z-210911T0200Z/
/O.NEW.KCYS.FW.W.0030.210910T1600Z-210911T0200Z/
North Laramie Range/Medicine Bow NF-
Central and Northern Carbon/Ferris-Seminoe-Shirley Mountains-
Laramie Valley/Shirley Basin-
755 PM MDT Thu Sep 9 2021

...RED FLAG WARNING IN EFFECT FROM 10 AM TO 8 PM MDT FRIDAY FOR
GUSTY WINDS AND LOW HUMIDITY FOR FWZ 302...303 AND NORTHERN 308...

The National Weather Service in Cheyenne has issued a Red Flag
Warning, which is in effect from 10 AM to 8 PM MDT Friday. The
Fire Weather Watch is no longer in effect. 

* WIND...West to northwest winds around 15 to 20 MPH with 
  occasional gusts 30 to 35 MPH. 

* HUMIDITY...10 to 15 percent.

* HAINES...6.

* IMPACTS...any fires that develop will likely spread rapidly. 
  Outdoor burning is not recommended.

* IMPACTS...any fires that develop will likely spread rapidly. 
  Outdoor burning is not recommended.

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.

&&

$$

3 follow-up statements

985 
WWUS85 KCYS 101153
RFWCYS

URGENT - FIRE WEATHER MESSAGE
National Weather Service Cheyenne WY
553 AM MDT Fri Sep 10 2021

...RED FLAG WARNING IN EFFECT FOR GUSTY WINDS AND LOW HUMIDITY
FRIDAY FOR FWZ 301...302...303 AND NORTHERN 308...

WYZ301>303-308-102000-
/O.CON.KCYS.FW.W.0030.210910T1600Z-210911T0200Z/
Niobrara/Lower Elevations of Converse/Thunder Basin National
Grassland-North Laramie Range/Medicine Bow NF-
Central and Northern Carbon/Ferris-Seminoe-Shirley Mountains-
Laramie Valley/Shirley Basin-
553 AM MDT Fri Sep 10 2021

...RED FLAG WARNING REMAINS IN EFFECT FROM 10 AM THIS MORNING TO
8 PM MDT THIS EVENING FOR GUSTY WINDS AND LOW HUMIDITY FOR FWZ
302...303 AND NORTHERN 308...

* WIND...West to northwest winds around 15 to 20 MPH with 
  occasional gusts 30 to 35 MPH. 

* HUMIDITY...10 to 15 percent.

* HAINES...6.

* IMPACTS...any fires that develop will likely spread rapidly. 
  Outdoor burning is not recommended.

* IMPACTS...any fires that develop will likely spread rapidly. 
  Outdoor burning is not recommended.

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.

&&

$$

097 
WWUS85 KCYS 102027
RFWCYS

URGENT - FIRE WEATHER MESSAGE
National Weather Service Cheyenne WY
227 PM MDT Fri Sep 10 2021

...RED FLAG WARNING IN EFFECT FOR GUSTY WINDS AND LOW HUMIDITY
FRIDAY FOR FWZ 301...302...303 AND NORTHERN 308...

...FIRE WEATHER WATCH FOR FWZ ZONE 313 IN THE SOUTHERN NEBRASKA
PANHANDLE FROM 11AM TO 7PM SATURDAY...

WYZ301>303-308-110200-
/O.CON.KCYS.FW.W.0030.000000T0000Z-210911T0200Z/
Niobrara/Lower Elevations of Converse/Thunder Basin National
Grassland-North Laramie Range/Medicine Bow NF-
Central and Northern Carbon/Ferris-Seminoe-Shirley Mountains-
Laramie Valley/Shirley Basin-
227 PM MDT Fri Sep 10 2021

...RED FLAG WARNING REMAINS IN EFFECT UNTIL 8 PM MDT THIS EVENING
FOR LOW HUMIDITY AND GUSTY WINDS FOR FIRE WEATHER ZONES 301, 302,
303, AND 308...

* WIND...West to northwest winds around 15 to 20 MPH with 
  occasional gusts 30 to 35 MPH. 

* HUMIDITY...10 to 15 percent.

* HAINES...6.

* IMPACTS...any fires that develop will likely spread rapidly. 
  Outdoor burning is not recommended.

* IMPACTS...any fires that develop will likely spread rapidly. 
  Outdoor burning is not recommended.

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.

&&

$$

NEZ313-111100-
/O.NEW.KCYS.FW.A.0029.210911T1700Z-210912T0100Z/
Scotts Bluff National Monument/Wildcat Hills-
227 PM MDT Fri Sep 10 2021

...FIRE WEATHER WATCH IN EFFECT FROM SATURDAY MORNING THROUGH
SATURDAY EVENING FOR LOW HUMIDITY AND GUSTY WINDS FOR FIRE 
WEATHER ZONE 313...

The National Weather Service in Cheyenne has issued a Fire
Weather Watch, which is in effect from Saturday morning through
Saturday evening. 

* AFFECTED AREA...Fire weather zone 313.

* WIND...Northwest winds at 15 to 25 mph with gusts to 30 mph.

* HUMIDITY...15 to 20 percent

* HAINES...5

* THUNDERSTORMS...A few thunderstorms could develop after 5 pm. 


* IMPACTS...any fires that develop will likely spread rapidly. 
  Outdoor burning is not recommended.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Fire Weather Watch means that critical fire weather conditions
may develop. Listen for later forecasts and possible Red Flag
Warnings.

&&

$$

271 
WWUS85 KCYS 110205
RFWCYS

URGENT - FIRE WEATHER MESSAGE
National Weather Service Cheyenne WY
805 PM MDT Fri Sep 10 2021

...FIRE WEATHER WATCH FOR FWZ ZONE 313 IN THE SOUTHERN NEBRASKA
PANHANDLE FROM 11AM TO 7PM SATURDAY...

WYZ301>303-308-110315-
/O.EXP.KCYS.FW.W.0030.000000T0000Z-210911T0200Z/
Niobrara/Lower Elevations of Converse/Thunder Basin National
Grassland-North Laramie Range/Medicine Bow NF-
Central and Northern Carbon/Ferris-Seminoe-Shirley Mountains-
Laramie Valley/Shirley Basin-
805 PM MDT Fri Sep 10 2021

...RED FLAG WARNING HAS EXPIRED FOR FIRE WEATHER ZONES 301, 302, 
303, AND 308...

Increasing humidity values and decreasing wind speeds will ease
fire weather concerns into the night. 

$$

NEZ313-111200-
/O.CON.KCYS.FW.A.0029.210911T1700Z-210912T0100Z/
Scotts Bluff National Monument/Wildcat Hills-
805 PM MDT Fri Sep 10 2021

...FIRE WEATHER WATCH REMAINS IN EFFECT FROM SATURDAY MORNING
THROUGH SATURDAY EVENING FOR GUSTY WINDS AND LOW RELATIVE HUMIDITY 
FOR FIRE WEATHER ZONE 313...

* AFFECTED AREA...Fire weather zone 313.

* WIND...Northwest winds at 15 to 25 mph with gusts to 30 mph.

* HUMIDITY...15 to 20 percent

* HAINES...5

* THUNDERSTORMS...A few thunderstorms could develop after 5 pm.

* IMPACTS...any fires that develop will likely spread rapidly. 
  Outdoor burning is not recommended.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Fire Weather Watch means that critical fire weather conditions
may develop. Listen for later forecasts and possible Red Flag
Warnings.

&&

$$

The office that day

Everything else NWS Cheyenne, WY issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Sep 10, 5:45 PM MDT	Special Weather Statement	CYS	Carbon	45 min

Nearby

Red Flag Warnings in Wyoming, 2021 Every red flag warning in 2021

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text.