Alert archive / Montana / Red Flag Warnings in 2021
Red Flag Warning 12, NWS Great Falls, MT
NWS Great Falls, MT issued this red flag warning at Aug 7, 2021, 10:48 AM MDT for 5 counties in Montana. It took effect at Aug 8, 2021, 12:00 PM MDT. It was in force for 7 hr. 6 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
- Aug 7, 2021, 10:48 AM MDT (16:48 UTC)
- In effect from
- Aug 8, 2021, 12:00 PM MDT
- Expired
- Aug 8, 2021, 7:26 PM MDT
- In force
- 7 hr
- Issued by
- NWS Great Falls, MT
Counties Broadwater County, MT, Gallatin County, MT, Jefferson County, MT, Lewis and Clark County, MT, Meagher County, MT
The radar
The Great Falls radar (KTFX), 125 km from the middle of the area, began a volume at 16:46 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 |
|---|---|---|---|
| Aug 8, 2:35 PM MDT | TSTM WND DMG | 5 Ne Townsend, MT | REPORT FROM BROADWATER SHERIFF OF MINOR TREE DAMAGE IN BROADWATER COUNTY. |
| Aug 8, 2:40 PM MDT | TSTM WND GST 50 | 9 Ene Winston, MT | ESTIMATED WIND GUSTS NEAR 50 MPH. |
| Aug 8, 3:14 PM MDT | NON-TSTM WND GST 67 | 1 Wnw Logan, MT | MEASURED BY KMTTHREE22. MAX SUSTAINED WIND OF 58MPH WITH PEAK GUST OF 67 MPH. TEMP DROPPED FROM 92 TO 65 IN ABOUT 15 MIN. |
| Aug 8, 3:29 PM MDT | NON-TSTM WND GST 62 | 3 N Manhattan, MT | REPORTED BY AMBIENT WEATHER NETWORK. |
| Aug 8, 3:42 PM MDT | NON-TSTM WND GST 55 | Bozeman Yellowstone Int, MT | KBZN ASOS. |
| Aug 8, 3:42 PM MDT | NON-TSTM WND GST 60 | 6 N Belgrade, MT | NON TSTORM WIND GUST OF 60.4 MPH MEASURED BY AMBIENT WEATHER STATION. |
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, 4.8 hours before the alert went out and 145 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
- 1763 m above ground
- 0-6 km bulk shear
- 26 kt
- 0-1 km storm-relative helicity
- 151 m²/s²
- 0-3 km storm-relative helicity
- 169 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
183 WWUS85 KTFX 071648 RFWTFX URGENT - FIRE WEATHER MESSAGE National Weather Service Great Falls MT 1048 AM MDT Sat Aug 7 2021 MTZ118-081200- /O.UPG.KTFX.FW.A.0009.210808T1800Z-210809T0300Z/ /O.NEW.KTFX.FW.W.0012.210808T1800Z-210809T0300Z/ Helena and Townsend Ranger Districts of the Helena National Forest- 1048 AM MDT Sat Aug 7 2021 ...RED FLAG WARNING IN EFFECT FROM NOON TO 9 PM MDT SUNDAY FOR LOW RELATIVE HUMIDITY, AS WELL AS, WIND SHIFT AND STRONG WINDS WITH A COLD FRONT FOR FIRE WEATHER ZONE 118... The National Weather Service in Great Falls has issued a Red Flag Warning which is in effect from noon to 9 PM MDT Sunday, for low relative humidity, as well as, wind shift and strong winds with a cold front. The Fire Weather Watch is no longer in effect. * AFFECTED AREA...Helena and Townsend Ranger Districts of the Helena National Forest. * THUNDERSTORMS...Some thunderstorm activity is possible along the cold front, as well. * WINDS...Northwest 15 to 20 mph with gusts up to 40 mph. * RELATIVE HUMIDITY...As low as 19 percent. * HUMIDITY...Humidity as low as 15 percent before the cold front arrives. * IMPACTS...Lightning in and near thunderstorms may cause new fire starts. In addition, gusty outflow winds may cause existing fires to exhibit erratic behavior. 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. && Fogleman $$ http://www.weather.gov/greatfalls
5 follow-up statements
483 WWUS85 KTFX 071655 RFWTFX URGENT - FIRE WEATHER MESSAGE National Weather Service Great Falls MT 1055 AM MDT Sat Aug 7 2021 MTZ118-081200- /O.CON.KTFX.FW.W.0012.210808T1800Z-210809T0300Z/ Helena and Townsend Ranger Districts of the Helena National Forest- 1055 AM MDT Sat Aug 7 2021 ...RED FLAG WARNING REMAINS IN EFFECT FROM NOON TO 9 PM MDT SUNDAY FOR LOW RELATIVE HUMIDITY, AS WELL AS, WIND SHIFT AND STRONG WINDS WITH A COLD FRONT FOR FIRE WEATHER ZONE 118... * AFFECTED AREA...Helena and Townsend Ranger Districts of the Helena National Forest. * THUNDERSTORMS...Some thunderstorm activity is possible along the cold front, as well. * WINDS...Northwest 15 to 20 mph with gusts up to 40 mph. * RELATIVE HUMIDITY...As low as 19 percent. * IMPACTS...Lightning in and near thunderstorms may cause new fire starts. In addition, gusty outflow winds may cause existing fires to exhibit erratic behavior. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now, or will shortly. A combination of strong winds, low relative humidity, and warm temperatures can contribute to extreme fire behavior. Please advise the appropriate officials or fire crews in these areas of this Red Flag Warning. && Fogleman $$ http://www.weather.gov/greatfalls
836 WWUS85 KTFX 080849 RFWTFX URGENT - FIRE WEATHER MESSAGE National Weather Service Great Falls MT 249 AM MDT Sun Aug 8 2021 MTZ118-090300- /O.CON.KTFX.FW.W.0012.210808T1800Z-210809T0300Z/ Helena and Townsend Ranger Districts of the Helena National Forest- 249 AM MDT Sun Aug 8 2021 ...RED FLAG WARNING REMAINS IN EFFECT FROM NOON TODAY TO 9 PM MDT THIS EVENING FOR LOW RELATIVE HUMIDITY, STRONG WINDS, AND A FRONTAL PASSAGE FOR FIRE WEATHER ZONE 118... * AFFECTED AREA...Helena and Townsend Ranger Districts of the Helena National Forest. * THUNDERSTORMS...Some thunderstorm activity is possible along the cold front. * WINDS...Southwest 15 to 25 mph, switching to north-northwest 15 to 25 mph with gusts up to 40 mph in the afternoon. * RELATIVE HUMIDITY...As low as 18 percent. * IMPACTS...Lightning in and near thunderstorms may cause new fire starts. In addition, gusty outflow winds may cause existing fires to exhibit erratic behavior. 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. && $$ http://www.weather.gov/greatfalls
089 WWUS85 KTFX 082005 RFWTFX URGENT - FIRE WEATHER MESSAGE National Weather Service Great Falls MT 205 PM MDT Sun Aug 8 2021 MTZ118-090300- /O.CON.KTFX.FW.W.0012.000000T0000Z-210809T0300Z/ Helena and Townsend Ranger Districts of the Helena National Forest- 205 PM MDT Sun Aug 8 2021 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 9 PM MDT THIS EVENING FOR LOW RELATIVE HUMIDITY, STRONG WINDS, AND A FRONTAL PASSAGE FOR FIRE WEATHER ZONE 118... * AFFECTED AREA...Helena and Townsend Ranger Districts of the Helena National Forest. * THUNDERSTORMS...Some thunderstorm activity is possible along the cold front. * WINDS...Northwest 15 to 25 mph with gusts up to 50 mph. * RELATIVE HUMIDITY...As low as 15 percent. * IMPACTS...Lightning in and near thunderstorms may cause new fire starts. In addition, gusty outflow winds may cause existing fires to exhibit erratic behavior. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now, or will shortly. A combination of strong winds, low relative humidity, and warm temperatures can contribute to extreme fire behavior. Please advise the appropriate officials or fire crews in these areas of this Red Flag Warning. && $$ http://www.weather.gov/greatfalls
780 WWUS85 KTFX 082138 RFWTFX URGENT - FIRE WEATHER MESSAGE National Weather Service Great Falls MT 338 PM MDT Sun Aug 8 2021 MTZ118-090300- /O.CON.KTFX.FW.W.0012.000000T0000Z-210809T0300Z/ Helena and Townsend Ranger Districts of the Helena National Forest- 338 PM MDT Sun Aug 8 2021 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 9 PM MDT THIS EVENING FOR LOW RELATIVE HUMIDITY, STRONG WINDS, AND A FRONTAL PASSAGE FOR FIRE WEATHER ZONE 118... * AFFECTED AREA...Helena and Townsend Ranger Districts of the Helena National Forest. * THUNDERSTORMS...Some thunderstorm activity is possible along the cold front. * WINDS...Northwest 15 to 25 mph with gusts up to 50 mph. * RELATIVE HUMIDITY...As low as 15 percent. * IMPACTS...Lightning in and near thunderstorms may cause new fire starts. In addition, gusty outflow winds may cause existing fires to exhibit erratic behavior. 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. && $$ http://www.weather.gov/greatfalls
147 WWUS85 KTFX 090126 RFWTFX URGENT - FIRE WEATHER MESSAGE National Weather Service Great Falls MT 726 PM MDT Sun Aug 8 2021 MTZ118-090230- /O.CAN.KTFX.FW.W.0012.000000T0000Z-210809T0300Z/ Helena and Townsend Ranger Districts of the Helena National Forest- 726 PM MDT Sun Aug 8 2021 ...RED FLAG WARNING IS CANCELLED FOR LOW RELATIVE HUMIDITY, STRONG WINDS, AND A FRONTAL PASSAGE FOR FIRE WEATHER ZONE 118... The National Weather Service in Great Falls has cancelled the Red Flag Warning. Wetting rains have fallen across most of Fire Weather Zone 118 this evening, and winds have begun to die down with rising humidity, reducing the fire danger. $$ 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.