Alert archive / Montana / Red Flag Warnings in 2021
Red Flag Warning 12, NWS Missoula, MT
NWS Missoula, MT issued this red flag warning at Aug 4, 2021, 12:21 PM PDT for 5 counties in Idaho; 13 counties in Montana. It took effect at Aug 5, 2021, 8:00 AM PDT. It was in force for 15 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 4, 2021, 12:21 PM PDT (19:21 UTC)
- In effect from
- Aug 5, 2021, 8:00 AM PDT
- Expired
- Aug 5, 2021, 11:00 PM PDT
- In force
- 15 hr
- Issued by
- NWS Missoula, MT
Counties Clearwater County, ID, Idaho County, ID, Latah County, ID, Lewis County, ID, Nez Perce County, ID, Beaverhead County, MT, Deer Lodge County, MT, Flathead County, MT, Granite County, MT, Jefferson County, MT, Lewis and Clark County, MT, Madison County, MT, Mineral County, MT, Missoula County, MT, Powell County, MT, Ravalli County, MT, Sanders County, MT, Silver Bow County, MT
The radar
The Missoula radar (KMSX), 61 km from the middle of the area, began a volume at 19:23 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 5, 1:47 PM PDT | TSTM WND GST 51 | 10 Wsw Grant, MT | MESONET STATION BRRM8 BRENNER RAWS. |
| Aug 5, 2:58 PM PDT | TSTM WND GST 48 | 5 Ene Dillon, MT | ASOS STATION KDLN DILLON AIRPORT. |
| Aug 5, 3:08 PM PDT | TSTM WND GST 56 | 3 Sse Butte, MT | ASOS STATION KBTM BUTTE-MOONEY AP. |
| Aug 5, 4:39 PM PDT | TSTM WND GST 54 | 2 E Helena, MT | ASOS STATION KHLN HELENA AIRPORT. |
| Aug 5, 4:50 PM PDT | TSTM WND GST 63 | 2 E Helena, MT | ASOS STATION KHLN HELENA AIRPORT. |
| Aug 5, 5:28 PM PDT | NON-TSTM WND GST 63 | 8 Ssw Wolf Creek, MT | MESONET STATION MTSBN 8.4 S WOLF CREEK (MT DOT). |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Spokane, WA (KOTX), launched 12:00Z, 7.4 hours before the alert went out and 216 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
- 18 J/kg
- Mixed-layer CIN
- -391 J/kg
- Mixed-layer LCL
- 2638 m above ground
- 0-6 km bulk shear
- 37 kt
- 0-1 km storm-relative helicity
- 131 m²/s²
- 0-3 km storm-relative helicity
- 259 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.3
The text
As transmitted.
628 WWUS85 KMSO 041921 RFWMSO URGENT - FIRE WEATHER MESSAGE National Weather Service Missoula MT 121 PM MDT Wed Aug 4 2021 IDZ102-103-060600- /O.NEW.KMSO.FW.W.0012.210805T1500Z-210806T0600Z/ Palouse/Hells Canyon-Clearwater/Nez Perce- 1221 PM PDT Wed Aug 4 2021 ...RED FLAG WARNING IN EFFECT FROM 8 AM TO 11 PM PDT THURSDAY... * Affected area: Fire Zone 102 (Palouse/Hells Canyon). Fire Zone 103 (Clearwater/Nez Perce). * Impacts: Dangerous conditions due to strong and erratic outflow winds along with new fire starts are possible, particularly for areas that did not see significant rainfall over the last few days. * Thunderstorms: A mix of wet and dry storms will develop in the morning, with several waves of storms possible into Thursday evening. * Outflow Winds: Widespread outflow winds of 25-40 mph are anticipated. Stronger storms could produce winds up to 50 mph. && $$ MTZ106-108>111-060600- /O.NEW.KMSO.FW.W.0012.210805T1800Z-210806T0600Z/ West Lolo-East Lolo-Bitterroot-Deerlodge/West Beaverhead- East Beaverhead- 121 PM MDT Wed Aug 4 2021 ...RED FLAG WARNING IN EFFECT FROM NOON THURSDAY TO MIDNIGHT MDT THURSDAY NIGHT... * Affected area: Fire Zone 106 (West Lolo). Fire Zone 108 (East Lolo). Fire Zone 109 (Bitterroot). Fire Zone 110 (Deerlodge/West Beaverhead). Fire Zone 111 (East Beaverhead). * Impacts: Dangerous conditions due to strong and erratic outflow winds along with new fire starts are possible, particularly for areas that did not see significant rainfall over the last few days. * Thunderstorms: A mix of wet and dry storms will develop in the early afternoon, with several waves of storms possible into Thursday evening. * Outflow Winds: Widespread outflow winds of 25-40 mph are anticipated. Stronger storms could produce winds over 50 mph. && $$
1 follow-up statement
628 WWUS85 KMSO 060544 RFWMSO URGENT - FIRE WEATHER MESSAGE National Weather Service Missoula MT 1144 PM MDT Thu Aug 5 2021 IDZ102-103-060645- /O.EXP.KMSO.FW.W.0012.000000T0000Z-210806T0600Z/ Palouse/Hells Canyon-Clearwater/Nez Perce- 1044 PM PDT Thu Aug 5 2021 ...RED FLAG WARNING WILL EXPIRE AT 11 PM PDT THIS EVENING... * Affected area: Fire Zone 102 (Palouse/Hells Canyon). Fire Zone 103 (Clearwater/Nez Perce). && $$ MTZ106-108>111-060645- /O.EXP.KMSO.FW.W.0012.000000T0000Z-210806T0600Z/ West Lolo-East Lolo-Bitterroot-Deerlodge/West Beaverhead- East Beaverhead- 1144 PM MDT Thu Aug 5 2021 ...RED FLAG WARNING WILL EXPIRE AT MIDNIGHT MDT TONIGHT... * Affected area: Fire Zone 106 (West Lolo). Fire Zone 108 (East Lolo). Fire Zone 109 (Bitterroot). Fire Zone 110 (Deerlodge/West Beaverhead). Fire Zone 111 (East Beaverhead). && $$
The office that day
Everything else NWS Missoula, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 3, 7:55 PM PDT | Special Weather Statement | MSO | 65 min | |
| Aug 4, 2:57 PM PDT | Special Weather Statement | MSO | Powell | 48 min |
| Aug 4, 4:30 PM PDT | Special Weather Statement | MSO | Flathead | 30 min |
| Aug 4, 4:35 PM PDT | Special Weather Statement | MSO | Lake | 25 min |
| Aug 4, 4:50 PM PDT | Special Weather Statement | MSO | Lake | 25 min |
| Aug 4, 4:55 PM PDT | Special Weather Statement | MSO | Flathead | 35 min |
Nearby
Red Flag Warnings in Montana, 2021Red Flag Warnings in Idaho, 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.