Alert archive / Montana / Red Flag Warnings in 2021
Red Flag Warning 7, NWS Great Falls, MT
NWS Great Falls, MT issued this red flag warning at Jul 14, 2021, 1:32 PM MDT for 9 counties in Montana. It took effect at Jul 15, 2021, 2:00 PM MDT. It was in force for 7 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 14, 2021, 1:32 PM MDT (19:32 UTC)
- In effect from
- Jul 15, 2021, 2:00 PM MDT
- Expired
- Jul 15, 2021, 9:00 PM MDT
- In force
- 7 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, Powell County, MT
The radar
The Great Falls radar (KTFX), 86 km from the middle of the area, began a volume at 19:33 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, 7.5 hours before the alert went out and 101 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
- 1308 m above ground
- 0-6 km bulk shear
- 17 kt
- 0-1 km storm-relative helicity
- 6 m²/s²
- 0-3 km storm-relative helicity
- 58 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
363 WWUS85 KTFX 141932 RFWTFX URGENT - FIRE WEATHER MESSAGE National Weather Service Great Falls MT 132 PM MDT Wed Jul 14 2021 MTZ116-118-151200- /O.NEW.KTFX.FW.W.0007.210715T2000Z-210716T0300Z/ Lincoln Ranger District of the Helena National Forest- Helena and Townsend Ranger Districts of the Helena National Forest- 132 PM MDT Wed Jul 14 2021 ...RED FLAG WARNING IN EFFECT FROM 2 PM TO 9 PM MDT THURSDAY FOR GUSTY WINDS, LOW RELATIVE HUMIDITY, AND INCREASING THUNDERSTORM ACTIVITY FOR FIRE WEATHER ZONES 116 AND 118... The National Weather Service in Great Falls has issued a Red Flag Warning for gusty winds and low relative humidity, which is in effect from 2 PM to 9 PM MDT Thursday. * AFFECTED AREA...Lincoln Ranger District of the Helena National Forest and Helena and Townsend Ranger Districts of the Helena National Forest. * WINDS...West 10 to 20 mph, with gusts up to 30 mph. * RELATIVE HUMIDITY...As low as 13 percent. * THUNDERSTORMS...Scattered wet and dry * IMPACTS...In addition to the threat to create new fire starts due to lightning strikes, thunderstorms will be capable of producing gusty and erratic outflows, which could lead to extreme fire behavior on existing fires. 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. && Moldan $$ http://www.weather.gov/greatfalls
3 follow-up statements
007 WWUS85 KTFX 150814 RFWTFX URGENT - FIRE WEATHER MESSAGE National Weather Service Great Falls MT 214 AM MDT Thu Jul 15 2021 MTZ117-152200- /O.EXA.KTFX.FW.W.0007.210715T2000Z-210716T0300Z/ Central and Eastern Lewis and Clark National Forest Areas- 214 AM MDT Thu Jul 15 2021 ...RED FLAG WARNING IN EFFECT FROM 2 PM THIS AFTERNOON TO 9 PM MDT THIS EVENING FOR LOW HUMIDITY AND POTENTIAL DRY THUNDERSTORMS FOR FIRE WEATHER ZONE 117... The National Weather Service in Great Falls has issued a Red Flag Warning for increasing thunderstorm activity, which is in effect from 2 PM this afternoon to 9 PM MDT this evening. * AFFECTED AREA...Central and Eastern Lewis and Clark National Forest Areas. * WINDS...West 10 to 15 mph, with gusts up to 25 mph. * RELATIVE HUMIDITY...As low as 14 percent. * LIGHTNING...Some storms could produce frequent lightning strikes. * THUNDERSTORMS...Scattered wet and dry. * OUTFLOW WINDS...Thunderstorm outflow wind gusts of 30 to 50 mph are possible. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now, or will shortly. A combination of strong winds, low relative humidity, and warm temperatures can contribute to extreme fire behavior. Please advise the appropriate officials or fire crews in these areas of this Red Flag Warning. && $$ MTZ116-118-152200- /O.CON.KTFX.FW.W.0007.210715T2000Z-210716T0300Z/ Lincoln Ranger District of the Helena National Forest- Helena and Townsend Ranger Districts of the Helena National Forest- 214 AM MDT Thu Jul 15 2021 ...RED FLAG WARNING REMAINS IN EFFECT FROM 2 PM THIS AFTERNOON TO 9 PM MDT THIS EVENING FOR LOW HUMIDITY AND POTENTIAL DRY THUNDERSTORMS 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. * WINDS...West 10 to 15 mph, with gusts up to 25 mph. * RELATIVE HUMIDITY...As low as 14 percent. * LIGHTNING...Some storms could produce frequent lightning strikes. * THUNDERSTORMS...Scattered wet and dry. * OUTFLOW WINDS...Thunderstorm outflow wind gusts of 30 to 50 mph are 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. && $$ http://www.weather.gov/greatfalls
966 WWUS85 KTFX 152216 RFWTFX URGENT - FIRE WEATHER MESSAGE National Weather Service Great Falls MT 416 PM MDT Thu Jul 15 2021 MTZ116>118-160300- /O.CON.KTFX.FW.W.0007.000000T0000Z-210716T0300Z/ Lincoln Ranger District of the Helena National Forest- Central and Eastern Lewis and Clark National Forest Areas- Helena and Townsend Ranger Districts of the Helena National Forest- 416 PM MDT Thu Jul 15 2021 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 9 PM MDT THIS EVENING FOR LOW HUMIDITY AND POTENTIAL DRY THUNDERSTORMS FOR FIRE WEATHER ZONE 117... * AFFECTED AREA...Lincoln Ranger District of the Helena National Forest, Central and Eastern Lewis and Clark National Forest Areas and Helena and Townsend Ranger Districts of the Helena National Forest. * WINDS...West 10 to 15 mph with gusts up to 25 mph. * RELATIVE HUMIDITY...As low as 14 percent. * LIGHTNING...Some storms could produce frequent lightning strikes. * THUNDERSTORMS...Scattered wet and dry. * OUTFLOW WINDS...Thunderstorm outflow wind gusts of 30 to 50 mph are possible. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now, or will shortly. A combination of strong winds, low relative humidity, and warm temperatures can contribute to extreme fire behavior. Please advise the appropriate officials or fire crews in these areas of this Red Flag Warning. && $$ http://www.weather.gov/greatfalls
327 WWUS85 KTFX 160241 RFWTFX URGENT - FIRE WEATHER MESSAGE National Weather Service Great Falls MT 841 PM MDT Thu Jul 15 2021 MTZ116>118-160345- /O.EXP.KTFX.FW.W.0007.000000T0000Z-210716T0300Z/ 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- 841 PM MDT Thu Jul 15 2021 ...RED FLAG WARNING WILL EXPIRE AT 9 PM MDT THIS EVENING FOR LOW HUMIDITY AND POTENTIAL DRY THUNDERSTORMS FOR FIRE WEATHER ZONES 116, 117, AND 118... Relative humidity percentages have climbed back up above 20 percent and only an isolated thunderstorm or two will persist into the late evening hours. As such, the Red Flag Warning will be allowed to expire as scheduled at 9 PM MDT. $$ http://www.weather.gov/greatfalls
The office that day
Everything else NWS Great Falls, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 14, 1:38 PM MDT | Excessive Heat Watch | TFX | 49 hr |
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.