Alert archive / Montana / Red Flag Warnings in 2021
Red Flag Warning 14, NWS Missoula, MT
NWS Missoula, MT issued this red flag warning at Aug 17, 2021, 9:47 AM MDT for 4 counties in Montana. It took effect at Aug 17, 2021, 12:00 PM MDT. It was in force for 9 hr. 5 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 17, 2021, 9:47 AM MDT (15:47 UTC)
- In effect from
- Aug 17, 2021, 12:00 PM MDT
- Expired
- Aug 17, 2021, 9:00 PM MDT
- In force
- 9 hr
- Issued by
- NWS Missoula, MT
Counties Beaverhead County, MT, Jefferson County, MT, Madison County, MT, Silver Bow County, MT
The radar
The Missoula radar (KMSX), 200 km from the middle of the area, began a volume at 15:47 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 17, 2:45 PM MDT | TSTM WND GST 60 | 3 Sw Dillon, MT | IMET RELAYED THAT GUSTY WINDS FROM A THUNDERSTORM ROLLED THROUGH THE ICP FOR THE ALDER CREEK FIRE AND KNOCKED DOWN ALL OF THE PORTABLE TOILETS. |
| Aug 17, 2:45 PM MDT | TSTM WND GST 69 | 5 Ne Dillon, MT | |
| Aug 17, 3:34 PM MDT | TSTM WND GST 53 | 4 Nne Mcallister, MT | NORRIS HILL MDT. |
| Aug 17, 6:00 PM MDT | NON-TSTM WND GST 55 | 12 Se Boulder, MT | |
| Aug 17, 6:16 PM MDT | NON-TSTM WND GST 50 | 3 Ssw Ennis, MT | ENNIS RAWS. |
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, 3.8 hours before the alert went out and 246 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
- 2898 m above ground
- 0-6 km bulk shear
- 31 kt
- 0-1 km storm-relative helicity
- 15 m²/s²
- 0-3 km storm-relative helicity
- 155 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
994 WWUS85 KMSO 171547 RFWMSO URGENT - FIRE WEATHER MESSAGE National Weather Service Missoula MT 947 AM MDT Tue Aug 17 2021 MTZ111-180300- /O.NEW.KMSO.FW.W.0014.210817T1800Z-210818T0300Z/ East Beaverhead- 947 AM MDT Tue Aug 17 2021 ...RED FLAG WARNING IN EFFECT UNTIL 9 PM MDT THIS EVENING... * Affected area: Fire Zone 111 (East Beaverhead). * Impacts: A combination of gusty winds and low humidity will produce critical fire weather conditions this afternoon and evening. * Winds: Southwest 25 to 30 mph with gusts to around 40 mph. * Minimum humidities: 15 to 20 percent. && $$
1 follow-up statement
829 WWUS85 KMSO 180240 RFWMSO URGENT - FIRE WEATHER MESSAGE National Weather Service Missoula MT 840 PM MDT Tue Aug 17 2021 MTZ111-180345- /O.EXP.KMSO.FW.W.0014.000000T0000Z-210818T0300Z/ East Beaverhead- 840 PM MDT Tue Aug 17 2021 ...RED FLAG WARNING WILL EXPIRE AT 9 PM MDT THIS EVENING... Although breezy winds continue, RHs will continue to rise. && $$
The office that day
Everything else NWS Missoula, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 17, 2:55 PM MDT | Special Weather Statement | MSO | Silver Bow | 50 min |
| Aug 17, 3:26 PM MDT | Special Weather Statement | MSO | Powell | 49 min |
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.