Alert archive / Montana / Red Flag Warnings in 2021

Red Flag Warning 8, NWS Billings, MT

July 18, 2021Sheridan County, Wyoming; 17 counties in Montana

NWS Billings, MT issued this red flag warning at Jul 18, 2021, 3:10 PM MDT for Sheridan County, Wyoming; 17 counties in Montana. It took effect at Jul 19, 2021, 12:00 PM MDT. It was in force for 36 hr. 4 reports 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: Jul 18, 2021, 3:10 PM MDT (21:10 UTC)
In effect from: Jul 19, 2021, 12:00 PM MDT
Expired: Jul 20, 2021, 11:40 PM MDT
In force: 36 hr
Issued by: NWS Billings, MT

Counties Big Horn County, MT, Carbon County, MT, Carter County, MT, Custer County, MT, Fallon County, MT, Gallatin County, MT, Golden Valley County, MT, Madison County, MT, Musselshell County, MT, Park County, MT, Powder River County, MT, Rosebud County, MT, Stillwater County, MT, Sweet Grass County, MT, Treasure County, MT, Wheatland County, MT, Yellowstone County, MT, Sheridan County, WY

The radar

The Billings radar (KBLX), 38 km from the middle of the area, began a volume at 21:13 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

Time	Report	Where	Remark
Jul 20, 2:45 PM MDT	HAIL 0.25	6 Wsw Emigrant, MT
Jul 20, 4:18 PM MDT	TSTM WND GST 53	1 Sse Baker, MT
Jul 20, 4:43 PM MDT	TSTM WND GST 60	20 Nne Baker, MT	MAINLY PEA SIZE HAIL WITH A FEW QUARTERS. ENOUGH TO BREAK WINDOWS ON THE HOUSE.
Jul 20, 4:43 PM MDT	HAIL 1	20 Nne Baker, MT	MAINLY PEA SIZE HAIL WITH A FEW QUARTERS. ENOUGH TO BREAK WINDOWS ON THE HOUSE.

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

The nearest sounding before it

Great_falls, MT (KTFX), launched 12:00Z, 9.2 hours before the alert went out and 264 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 3122 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 54 m²/s²
0-3 km storm-relative helicity: 172 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

993 
WWUS85 KBYZ 182110
RFWBYZ

URGENT - FIRE WEATHER MESSAGE
National Weather Service Billings MT
310 PM MDT Sun Jul 18 2021

MTZ130>133-WYZ274-192115-
/O.UPG.KBYZ.FW.A.0006.210719T1800Z-210720T0600Z/
/O.NEW.KBYZ.FW.W.0008.210719T1800Z-210720T0600Z/
Northern Rosebud/Northern Treasure Counties-
Northern Cheyenne Indian Reservation/Ashland Ranger District
Custer Natl Forest-Custer County-
Sioux Ranger District Custer National Forest-Sheridan County-
310 PM MDT Sun Jul 18 2021

...RED FLAG WARNING IN EFFECT FROM NOON MONDAY TO MIDNIGHT MDT
MONDAY NIGHT...

The National Weather Service in Billings has issued a Red Flag
Warning...which is in effect from noon Monday to midnight MDT
Monday night. The Fire Weather Watch is no longer in effect.

* IMPACTS: Low humidities, hot temperatures and brisk southeast
  winds, will create erratic fire behavior for existing fires and 
  new fire starts.

* AFFECTED AREA: 
   In North Central WY Fire Zone...274.
   In Southeast MT Fire Zones...130...131...132.
   In Southeast MT and Northwest SD Fire Zone...133.

* COUNTIES AFFECTED: 
   In North Central WY...Sheridan.
   In Northwest SD...Harding.
   In South Central MT...Big Horn.
   In Southeast MT...Carter...Custer...Fallon...Powder River
                     Rosebud...Treasure.

* WIND: Southeast 15 to 25 mph with gusts up to 30 mph.

* HUMIDITY: As low as 9 percent.

* TEMPERATURES: 100 to 109 degrees.

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.

&&

$$

MTZ127>129-192115-
/O.UPG.KBYZ.FW.A.0006.210719T1800Z-210720T0600Z/
/O.NEW.KBYZ.FW.W.0008.210719T1800Z-210721T0600Z/
Golden Valley County/Musselshell county-Yellowstone County-
Crow Indian Reservation/Bighorn Canyon Rec Area-
310 PM MDT Sun Jul 18 2021

...RED FLAG WARNING IN EFFECT FROM NOON MONDAY TO MIDNIGHT MDT
TUESDAY NIGHT...

The National Weather Service in Billings has issued a Red Flag
Warning...which is in effect from noon Monday to midnight MDT
Tuesday night. The Fire Weather Watch is no longer in effect.

* IMPACTS: Low humidities, hot temperatures, gusty and erratic
  outflow winds from thunderstorms, will create erratic fire 
  behavior for existing fires and new fire starts. 

* AFFECTED AREA: 
   In South Central MT Fire Zones...127...128...129.

* COUNTIES AFFECTED: 
   In Central MT...Golden Valley...Musselshell.
   In South Central MT...Big Horn...Carbon...Yellowstone.

* WIND: Strong westerly outflow with gusts over 50 mph. 

* HUMIDITY: As low as 9 percent.

* TEMPERATURES: near 100 to 105 degrees. 

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.

&&

$$

MTZ123>126-192115-
/O.NEW.KBYZ.FW.W.0008.210719T1800Z-210721T0600Z/
Gallatin National Forest-Wheatland County/Sweet Grass County-
Stillwater County-Beartooth Ranger District Custer National Forest-
310 PM MDT Sun Jul 18 2021

...RED FLAG WARNING IN EFFECT FROM NOON MONDAY TO MIDNIGHT MDT
TUESDAY NIGHT...

The National Weather Service in Billings has issued a Red Flag
Warning...which is in effect from noon Monday to midnight MDT
Tuesday night.

* IMPACTS: Low humidities, hot temperatures, along with potential
  for wet and dry thunderstorms producing gusty and erratic 
  outflow winds, will create erratic fire behavior for existing 
  fires and new fire starts.

* AFFECTED AREA: 
   In South Central MT Fire Zones...123...124...125...126.

* COUNTIES AFFECTED: 
  In Central MT...Wheatland. In South Central MT...Carbon... 
  Park...Stillwater...SweetGrass. In Southwest MT...Gallatin.

* WIND: Strong westerly outflow with gusts over 50 mph.

* HUMIDITY: 10 to 15 percent. 

* TEMPERATURES: from near 100 to 105 degrees. 

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.

&&

$$


http://weather.gov/Billings

7 follow-up statements

240 
WWUS85 KBYZ 190915
RFWBYZ

URGENT - FIRE WEATHER MESSAGE
National Weather Service Billings MT
315 AM MDT Mon Jul 19 2021

MTZ130>133-WYZ274-200600-
/O.CON.KBYZ.FW.W.0008.210719T1800Z-210720T0600Z/
Northern Rosebud/Northern Treasure Counties-
Northern Cheyenne Indian Reservation/Ashland Ranger District
Custer Natl Forest-Custer County-
Sioux Ranger District Custer National Forest-Sheridan County-
315 AM MDT Mon Jul 19 2021

...RED FLAG WARNING REMAINS IN EFFECT FROM NOON TODAY TO MIDNIGHT
MDT TONIGHT...

* IMPACTS: Low humidities, hot temperatures and brisk southeast
  winds, will create erratic fire behavior for existing fires and
  new fire starts.

* AFFECTED AREA: 
   In North Central WY Fire Zone...274.
   In Southeast MT Fire Zones...130...131...132.
   In Southeast MT and Northwest SD Fire Zone...133.

* COUNTIES AFFECTED: 
   In North Central WY...Sheridan.
   In Northwest SD...Harding.
   In South Central MT...Big Horn.
   In Southeast MT...Carter...Custer...Fallon...Powder River
                     Rosebud...Treasure.

* WIND: Southeast 15 to 25 mph with gusts up to 35 mph.

* HUMIDITY: As low as 9 percent.

* TEMPERATURES: 100 to 109 degrees.

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.

&&

$$

MTZ123>129-200915-
/O.CON.KBYZ.FW.W.0008.210719T1800Z-210721T0600Z/
Gallatin National Forest-Wheatland County/Sweet Grass County-
Stillwater County-Beartooth Ranger District Custer National Forest-
Golden Valley County/Musselshell county-Yellowstone County-
Crow Indian Reservation/Bighorn Canyon Rec Area-
315 AM MDT Mon Jul 19 2021

...RED FLAG WARNING REMAINS IN EFFECT FROM NOON TODAY TO MIDNIGHT
MDT TUESDAY NIGHT...

* IMPACTS: Low humidities, hot temperatures, along with potential
  for wet and dry thunderstorms producing gusty and erratic 
  outflow winds, will create erratic fire behavior for existing 
  fires and new fire starts.

* AFFECTED AREA: 
   In South Central MT Fire Zones...123...124...125...126...127
                                    128...129.

* COUNTIES AFFECTED: 
   In Central MT...Golden Valley...Musselshell...Wheatland.
   In South Central MT...Big Horn...Carbon...Park...Stillwater
                         Sweet Grass...Yellowstone.
   In Southwest MT...Gallatin.

* WIND: Strong westerly outflow with gusts over 50 mph.

* HUMIDITY: As low as 9 percent.

* TEMPERATURES: near 100 to 105 degrees. 

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.

&&

$$


http://weather.gov/Billings

567 
WWUS85 KBYZ 191945
RFWBYZ

URGENT - FIRE WEATHER MESSAGE
National Weather Service Billings MT
145 PM MDT Mon Jul 19 2021

MTZ130>133-WYZ274-200600-
/O.CON.KBYZ.FW.W.0008.000000T0000Z-210720T0600Z/
Northern Rosebud/Northern Treasure Counties-
Northern Cheyenne Indian Reservation/Ashland Ranger District
Custer Natl Forest-Custer County-
Sioux Ranger District Custer National Forest-Sheridan County-
145 PM MDT Mon Jul 19 2021

...RED FLAG WARNING REMAINS IN EFFECT UNTIL MIDNIGHT MDT TONIGHT...

* IMPACTS: Low humidities, hot temperatures and brisk southeast
  winds, will create erratic fire behavior for existing fires and
  new fire starts.

* AFFECTED AREA: 
   In North Central WY Fire Zone...274.
   In Southeast MT Fire Zones...130...131...132.
   In Southeast MT and Northwest SD Fire Zone...133.

* COUNTIES AFFECTED: 
   In North Central WY...Sheridan.
   In Northwest SD...Harding.
   In South Central MT...Big Horn.
   In Southeast MT...Carter...Custer...Fallon...Powder River
                     Rosebud...Treasure.

* WIND: Southeast 15 to 25 mph with gusts up to 35 mph.

* HUMIDITY: As low as 9 percent.

* TEMPERATURES: 100 to 109 degrees.

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.

&&

$$

MTZ123>129-201945-
/O.CON.KBYZ.FW.W.0008.000000T0000Z-210721T0600Z/
Gallatin National Forest-Wheatland County/Sweet Grass County-
Stillwater County-Beartooth Ranger District Custer National Forest-
Golden Valley County/Musselshell county-Yellowstone County-
Crow Indian Reservation/Bighorn Canyon Rec Area-
145 PM MDT Mon Jul 19 2021

...RED FLAG WARNING REMAINS IN EFFECT UNTIL MIDNIGHT MDT TUESDAY
NIGHT...

* IMPACTS: Low humidities, hot temperatures, along with potential
  for wet and dry thunderstorms producing gusty and erratic 
  outflow winds, will create erratic fire behavior for existing 
  fires and new fire starts.

* AFFECTED AREA: 
   In South Central MT Fire Zones...123...124...125...126...127
                                    128...129.

* COUNTIES AFFECTED: 
   In Central MT...Golden Valley...Musselshell...Wheatland.
   In South Central MT...Big Horn...Carbon...Park...Stillwater
                         Sweet Grass...Yellowstone.
   In Southwest MT...Gallatin.

* WIND: Strong westerly outflow with gusts over 50 mph.

* HUMIDITY: As low as 9 percent.

* TEMPERATURES: Near 100 to 105 degrees.

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.

&&

$$


http://weather.gov/Billings

147 
WWUS85 KBYZ 200541
RFWBYZ

URGENT - FIRE WEATHER MESSAGE
National Weather Service Billings MT
1141 PM MDT Mon Jul 19 2021

MTZ130>133-WYZ274-200645-
/O.CAN.KBYZ.FW.W.0008.000000T0000Z-210720T0600Z/
Northern Rosebud/Northern Treasure Counties-
Northern Cheyenne Indian Reservation/Ashland Ranger District
Custer Natl Forest-Custer County-
Sioux Ranger District Custer National Forest-Sheridan County-
1141 PM MDT Mon Jul 19 2021

...RED FLAG WARNING IS CANCELLED...

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

Humidities are slowly rising as temperatures cool this evening.
Expect afternoon humidities in the mid to upper teens along with 
breezy and slightly cooler conditions on Tuesday.

$$

MTZ123>129-210545-
/O.CON.KBYZ.FW.W.0008.000000T0000Z-210721T0600Z/
Gallatin National Forest-Wheatland County/Sweet Grass County-
Stillwater County-Beartooth Ranger District Custer National Forest-
Golden Valley County/Musselshell county-Yellowstone County-
Crow Indian Reservation/Bighorn Canyon Rec Area-
1141 PM MDT Mon Jul 19 2021

...RED FLAG WARNING REMAINS IN EFFECT UNTIL MIDNIGHT MDT TUESDAY
NIGHT...

* IMPACTS: Low humidities, hot temperatures, and the potential for
  wet and dry thunderstorms producing gusty and erratic outflow
  winds, will create erratic fire behavior for existing fires and
  possible new fire starts.

* AFFECTED AREA: 
   In South Central MT Fire Zones...123...124...125...126...127
                                    128...129.

* COUNTIES AFFECTED: 
   In Central MT...Golden Valley...Musselshell...Wheatland.
   In South Central MT...Big Horn...Carbon...Park...Stillwater
                         Sweet Grass...Yellowstone.
   In Southwest MT...Gallatin.

* WIND: Southwest to west 15 to 25 mph, with higher gusts near
  thunderstorm activity Tuesday afternoon.

* HUMIDITY: Minimums from 18 to 30 percent on Tuesday.

* TEMPERATURES: In the upper 80s and 90s on Tuesday.

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.

&&

$$

http://weather.gov/Billings

115 
WWUS85 KBYZ 200931
RFWBYZ

URGENT - FIRE WEATHER MESSAGE
National Weather Service Billings MT
331 AM MDT Tue Jul 20 2021

MTZ133-210600-
/O.EXB.KBYZ.FW.W.0008.210720T1800Z-210721T0600Z/
Sioux Ranger District Custer National Forest-
331 AM MDT Tue Jul 20 2021

...RED FLAG WARNING IN EFFECT FROM NOON TODAY TO MIDNIGHT MDT
TONIGHT...

The National Weather Service in Billings has issued a Red Flag
Warning...which is in effect from noon today to midnight MDT
tonight.

* IMPACTS: Low humidities, hot temperatures, increasing
  thunderstorm activity, and gusty winds will create erratic fire
  behavior and possible new fire starts.

* AFFECTED AREA: 
   In Southeast MT and Northwest SD Fire Zone...133.

* COUNTIES AFFECTED: 
   In Northwest SD...Harding.
   In Southeast MT...Carter...Fallon.

* WIND: Southeast 15 to 25 mph with gusts up to 35 mph. Strong and
  erratic winds are expected near thunderstorms.

* HUMIDITY: As low as 17 percent.

* TEMPERATURES: Highs around 100 degrees.

* THUNDERSTORMS: Scattered thunderstorms expected between 4 and 10
  pm.

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.

&&

$$

MTZ123>129-210600-
/O.CON.KBYZ.FW.W.0008.000000T0000Z-210721T0600Z/
Gallatin National Forest-Wheatland County/Sweet Grass County-
Stillwater County-Beartooth Ranger District Custer National Forest-
Golden Valley County/Musselshell county-Yellowstone County-
Crow Indian Reservation/Bighorn Canyon Rec Area-
331 AM MDT Tue Jul 20 2021

...RED FLAG WARNING REMAINS IN EFFECT UNTIL MIDNIGHT MDT TONIGHT...

* IMPACTS: Low humidities, hot temperatures, increasing
  thunderstorm activity, and gusty winds will create erratic fire
  behavior and possible new fire starts.

* AFFECTED AREA: 
   In South Central MT Fire Zones...123...124...125...126...127
                                    128...129.

* COUNTIES AFFECTED: 
   In Central MT...Golden Valley...Musselshell...Wheatland.
   In South Central MT...Big Horn...Carbon...Park...Stillwater
                         Sweet Grass...Yellowstone.
   In Southwest MT...Gallatin.

* WIND: Southwest to west 10 to 20 mph with gusts around 25 mph.
  Strong and erratic winds are expected near thunderstorms.

* HUMIDITY: Minimums from 18 to 28 percent.

* TEMPERATURES: Highs in the 90s.

* THUNDERSTORMS: Scattered thunderstorms expected between noon and
  11 pm.

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.

&&

$$

http://weather.gov/Billings

128 
WWUS85 KBYZ 201953
RFWBYZ

URGENT - FIRE WEATHER MESSAGE
National Weather Service Billings MT
153 PM MDT Tue Jul 20 2021

MTZ123>129-210600-
/O.CON.KBYZ.FW.W.0008.000000T0000Z-210721T0600Z/
Gallatin National Forest-Wheatland County/Sweet Grass County-
Stillwater County-Beartooth Ranger District Custer National Forest-
Golden Valley County/Musselshell county-Yellowstone County-
Crow Indian Reservation/Bighorn Canyon Rec Area-
153 PM MDT Tue Jul 20 2021

...RED FLAG WARNING REMAINS IN EFFECT UNTIL MIDNIGHT MDT TONIGHT...

* IMPACTS: Low humidities, hot temperatures, strong gusty winds, 
  and increasing thunderstorm activity will create erratic fire 
  behavior and new fire starts. 

* AFFECTED AREA: 
   In South Central MT Fire Zones...123...124...125...126...127
                                    128...129.

* COUNTIES AFFECTED: 
   In Central MT...Golden Valley...Musselshell...Wheatland.
   In South Central MT...Big Horn...Carbon...Park...Stillwater
                         Sweet Grass...Yellowstone.
   In Southwest MT...Gallatin.

* WIND: Southwest to northwest 10 to 20 mph with gusts around 25 
  mph. Strong and erratic winds are expected near thunderstorms.

* HUMIDITY: Minimums from 18 to 28 percent.

* TEMPERATURES: Highs in the 90s.

* THUNDERSTORMS: Scattered thunderstorms expected between now and 
  11 pm.

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.

&&

$$

MTZ133-210600-
/O.CON.KBYZ.FW.W.0008.000000T0000Z-210721T0600Z/
Sioux Ranger District Custer National Forest-
153 PM MDT Tue Jul 20 2021

...RED FLAG WARNING REMAINS IN EFFECT UNTIL MIDNIGHT MDT TONIGHT...

* IMPACTS: Low humidities, hot temperatures, strong gusty winds, 
  and increasing thunderstorm activity will create erratic fire 
  behavior and new fire starts. 

* AFFECTED AREA: 
   In Southeast MT and Northwest SD Fire Zone...133.

* COUNTIES AFFECTED: 
   In Northwest SD...Harding.
   In Southeast MT...Carter...Fallon.

* WIND: Southeast 15 to 25 mph with gusts up to 35 mph. Strong and
  erratic winds are expected near thunderstorms.

* HUMIDITY: As low as 17 percent.

* TEMPERATURES: Highs around 100 degrees.

* THUNDERSTORMS: Scattered thunderstorms expected between 4 and 
  10 pm.

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.

&&

$$


http://weather.gov/Billings

344 
WWUS85 KBYZ 210330
RFWBYZ

URGENT - FIRE WEATHER MESSAGE
National Weather Service Billings MT
930 PM MDT Tue Jul 20 2021

MTZ123>129-210430-
/O.CAN.KBYZ.FW.W.0008.000000T0000Z-210721T0600Z/
Gallatin National Forest-Wheatland County/Sweet Grass County-
Stillwater County-Beartooth Ranger District Custer National Forest-
Golden Valley County/Musselshell county-Yellowstone County-
Crow Indian Reservation/Bighorn Canyon Rec Area-
930 PM MDT Tue Jul 20 2021

...RED FLAG WARNING IS CANCELLED...

The National Weather Service in Billings has cancelled the Red
Flag Warning. While thunderstorms are still possible late this
evening, the threat of strong outflow winds has diminished.

$$

MTZ133-210600-
/O.CON.KBYZ.FW.W.0008.000000T0000Z-210721T0600Z/
Sioux Ranger District Custer National Forest-
930 PM MDT Tue Jul 20 2021

...RED FLAG WARNING REMAINS IN EFFECT UNTIL MIDNIGHT MDT TONIGHT...

* IMPACTS: Low humidities, hot temperatures, strong gusty winds,
  and thunderstorm activity will create erratic fire behavior and 
  new fire starts. 

* AFFECTED AREA: 
   In Southeast MT and Northwest SD Fire Zone...133.

* COUNTIES AFFECTED: 
   In Northwest SD...Harding.
   In Southeast MT...Carter...Fallon.

* WIND: Southeast 15 to 25 mph with gusts up to 35 mph. Strong 
  and erratic winds are expected near thunderstorms.

* HUMIDITY: As low as 25 percent.

* TEMPERATURES: In the 80s.

* THUNDERSTORMS: Scattered thunderstorms expected through midnight
  MDT.

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.

&&

$$


http://weather.gov/Billings

822 
WWUS85 KBYZ 210540
RFWBYZ

URGENT - FIRE WEATHER MESSAGE
National Weather Service Billings MT
1140 PM MDT Tue Jul 20 2021

MTZ133-210645-
/O.CAN.KBYZ.FW.W.0008.000000T0000Z-210721T0600Z/
Sioux Ranger District Custer National Forest-
1140 PM MDT Tue Jul 20 2021

...RED FLAG WARNING IS CANCELLED...

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

Humidities are climbing as temperatures cool. A few wet
thunderstorms are possible tonight until around 1 am.

$$


http://weather.gov/Billings

The office that day

Everything else NWS Billings, MT issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 18, 2:06 AM MDT	Fire Weather Watch	BYZ	Sheridan	13 hr
Jul 17, 6:18 PM MDT	Special Weather Statement	BYZ	Fallon	27 min
Jul 17, 6:45 PM MDT	Special Weather Statement	BYZ	Fallon	45 min
Jul 17, 7:17 PM MDT	Special Weather Statement	BYZ	Fallon	43 min
Jul 17, 7:31 PM MDT	Special Weather Statement	BYZ	Fallon	44 min

Nearby

Red Flag Warnings in Montana, 2021 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.