Alert archive / Montana / Red Flag Warnings in 2021
Red Flag Warning 8, NWS Great Falls, MT
NWS Great Falls, MT issued this red flag warning at Jul 18, 2021, 1:58 PM MDT for 11 counties in Montana. It took effect at Jul 19, 2021, 12:00 PM MDT. It was in force for 9 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
- Jul 18, 2021, 1:58 PM MDT (19:58 UTC)
- In effect from
- Jul 19, 2021, 12:00 PM MDT
- Expired
- Jul 19, 2021, 9:00 PM MDT
- In force
- 9 hr
- Issued by
- NWS Great Falls, MT
Counties Broadwater County, MT, Cascade County, MT, Fergus County, MT, Gallatin County, MT, Jefferson County, MT, Judith Basin County, MT, Lewis and Clark County, MT, Meagher County, MT, Pondera County, MT, Powell County, MT, Teton County, MT
The radar
The Great Falls radar (KTFX), 59 km from the middle of the area, began a volume at 20:00 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
Great_falls, MT (KTFX), launched 12:00Z, 8.0 hours before the alert went out and 88 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.
- 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
The text
As transmitted.
990 WWUS85 KTFX 181958 RFWTFX URGENT - FIRE WEATHER MESSAGE National Weather Service Great Falls MT 158 PM MDT Sun Jul 18 2021 MTZ116-118-191100- /O.NEW.KTFX.FW.W.0008.210719T1800Z-210720T0300Z/ Lincoln Ranger District of the Helena National Forest- Helena and Townsend Ranger Districts of the Helena National Forest- 158 PM MDT Sun Jul 18 2021 ...RED FLAG WARNING IN EFFECT FROM NOON TO 9 PM MDT MONDAY FOR DRY THUNDERSTORMS WITH GUSTY AND ERRATIC OUTFLOW WINDS FOR FIRE WEATHER ZONES 116 AND 118... The National Weather Service in Great Falls has issued a Red Flag Warning for dry thunderstorms with gusty and erratic outflow winds, which is in effect from noon to 9 PM MDT Monday. * AFFECTED AREA...Lincoln Ranger District of the Helena National Forest, and Helena and Townsend Ranger Districts of the Helena National Forest. * IMPACTS...Gusty and erratic outflows developing from high-based scattered thunderstorms and frequent lightning in areas. * THUNDERSTORMS...A mix of wet and dry thunderstorms over the Red Flag Warning area. * OUTFLOW WINDS...Erratic outflow gusts over 40 mph possible. 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. Please advise the appropriate officials or fire crews in these areas of this Red Flag Warning. && $$ http://www.weather.gov/greatfalls
4 follow-up statements
045 WWUS85 KTFX 190823 RFWTFX URGENT - FIRE WEATHER MESSAGE National Weather Service Great Falls MT 223 AM MDT Mon Jul 19 2021 MTZ114-117-192200- /O.EXA.KTFX.FW.W.0008.210719T1800Z-210720T0300Z/ Lewis and Clark National Forest Rocky Mountain District- Rocky Mountain Front- Central and Eastern Lewis and Clark National Forest Areas- 223 AM MDT Mon Jul 19 2021 ...RED FLAG WARNING IN EFFECT FROM NOON TODAY TO 9 PM MDT THIS EVENING FOR DRY THUNDERSTORMS WITH GUSTY AND ERRATIC OUTFLOW WINDS FOR FIRE WEATHER ZONES 114 AND 117... The National Weather Service in Great Falls has issued a Red Flag Warning for dry thunderstorms with gusty and erratic outflow winds, which is in effect from noon today to 9 PM MDT this evening. * AFFECTED AREA...Lewis and Clark National Forest Rocky Mountain District-Rocky Mountain Front and Central and Eastern Lewis and Clark National Forest Areas. * LIGHTNING... * IMPACTS...Gusty and erratic outflows developing from high-based scattered thunderstorms and frequent lightning in some areas. * THUNDERSTORMS...A mix of wet and dry thunderstorms over the Red Flag Warning area. Wetting rain will become more likely with storms Monday evening but the increase in lightning activity following recent heat and dry fuels could lead to new fire starts. * OUTFLOW WINDS...Erratic outflow gusts over 40 mph possible. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now, or will shortly. A combination of strong winds, low relative humidity, and warm temperatures can contribute to extreme fire behavior. Please advise the appropriate officials or fire crews in these areas of this Red Flag Warning. && $$ MTZ116-118-192200- /O.CON.KTFX.FW.W.0008.210719T1800Z-210720T0300Z/ Lincoln Ranger District of the Helena National Forest- Helena and Townsend Ranger Districts of the Helena National Forest- 223 AM MDT Mon Jul 19 2021 ...RED FLAG WARNING REMAINS IN EFFECT FROM NOON TODAY TO 9 PM MDT THIS EVENING FOR DRY THUNDERSTORMS WITH GUSTY AND ERRATIC OUTFLOW WINDS FOR FIRE WEATHER ZONES 116 AND 118... * AFFECTED AREA...Lincoln Ranger District of the Helena National Forest and Helena and Townsend Ranger Districts of the Helena National Forest. * IMPACTS...Gusty and erratic outflows developing from high-based scattered thunderstorms and frequent lightning in areas. * THUNDERSTORMS...A mix of wet and dry thunderstorms over the Red Flag Warning area. * OUTFLOW WINDS...Erratic outflow gusts over 40 mph possible. 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. Please advise the appropriate officials or fire crews in these areas of this Red Flag Warning. && $$ http://www.weather.gov/greatfalls
612 WWUS85 KTFX 192011 RFWTFX URGENT - FIRE WEATHER MESSAGE National Weather Service Great Falls MT 211 PM MDT Mon Jul 19 2021 MTZ114-116>118-200300- /O.CON.KTFX.FW.W.0008.000000T0000Z-210720T0300Z/ Lewis and Clark National Forest Rocky Mountain District- Rocky Mountain Front- Lincoln Ranger District of the Helena National Forest- Central and Eastern Lewis and Clark National Forest Areas- Helena and Townsend Ranger Districts of the Helena National Forest- 211 PM MDT Mon Jul 19 2021 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 9 PM MDT THIS EVENING FOR DRY THUNDERSTORMS WITH GUSTY AND ERRATIC OUTFLOW WINDS FOR FIRE WEATHER ZONES 114 AND 117... * AFFECTED AREA...Lewis and Clark National Forest Rocky Mountain District-Rocky Mountain Front, Lincoln Ranger District of the Helena National Forest, Central and Eastern Lewis and Clark National Forest Areas and Helena and Townsend Ranger Districts of the Helena National Forest. * IMPACTS...Gusty and erratic outflows developing from high-based scattered thunderstorms and frequent lightning in some areas. * THUNDERSTORMS...A mix of wet and dry thunderstorms over the Red Flag Warning area. Wetting rain will become more likely with storms Monday evening but the increase in lightning activity following recent heat and dry fuels could lead to new fire starts. * OUTFLOW WINDS...Erratic outflow gusts over 40 mph possible. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now, or will shortly. A combination of strong winds, low relative humidity, and warm temperatures can contribute to extreme fire behavior. Please advise the appropriate officials or fire crews in these areas of this Red Flag Warning. && $$ http://www.weather.gov/greatfalls
195 WWUS85 KTFX 192145 CCA RFWTFX URGENT - FIRE WEATHER MESSAGE...CORRECTED National Weather Service Great Falls MT 345 PM MDT Mon Jul 19 2021 MTZ114-116>118-200300- /O.COR.KTFX.FW.W.0008.000000T0000Z-210720T0300Z/ Lewis and Clark National Forest Rocky Mountain District- Rocky Mountain Front- Lincoln Ranger District of the Helena National Forest- Central and Eastern Lewis and Clark National Forest Areas- Helena and Townsend Ranger Districts of the Helena National Forest- 345 PM MDT Mon Jul 19 2021 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 9 PM MDT THIS EVENING FOR DRY THUNDERSTORMS WITH GUSTY AND ERRATIC OUTFLOW WINDS FOR FIRE WEATHER ZONES 114, 116, 117, AND 118... * AFFECTED AREA...Lewis and Clark National Forest Rocky Mountain District-Rocky Mountain Front, Lincoln Ranger District of the Helena National Forest, Central and Eastern Lewis and Clark National Forest Areas and Helena and Townsend Ranger Districts of the Helena National Forest. * IMPACTS...Gusty and erratic outflows developing from high-based scattered thunderstorms and frequent lightning in some areas. * THUNDERSTORMS...A mix of wet and dry thunderstorms over the Red Flag Warning area. Wetting rain will become more likely with storms Monday evening but the increase in lightning activity following recent heat and dry fuels could lead to new fire starts. * OUTFLOW WINDS...Erratic outflow gusts over 40 mph possible. 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. Please advise the appropriate officials or fire crews in these areas of this Red Flag Warning. && $$ http://www.weather.gov/greatfalls
068 WWUS85 KTFX 200242 RFWTFX URGENT - FIRE WEATHER MESSAGE National Weather Service Great Falls MT 842 PM MDT Mon Jul 19 2021 MTZ114-116>118-200345- /O.EXP.KTFX.FW.W.0008.000000T0000Z-210720T0300Z/ Lewis and Clark National Forest Rocky Mountain District- Rocky Mountain Front- Lincoln Ranger District of the Helena National Forest- Central and Eastern Lewis and Clark National Forest Areas- Helena and Townsend Ranger Districts of the Helena National Forest- 842 PM MDT Mon Jul 19 2021 ...RED FLAG WARNING WILL EXPIRE AT 9 PM MDT THIS EVENING FOR DRY THUNDERSTORMS WITH GUSTY AND ERRATIC OUTFLOW WINDS FOR FIRE WEATHER ZONES 114, 116, 117, AND 118... Thunderstorm activity has ended for the evening; therefore, the Red Flag Warning will be allowed to expire. $$ http://www.weather.gov/greatfalls
Nearby
Red Flag Warnings in Montana, 2021Every 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.