Alert archive / Montana / Severe Thunderstorm Warnings in 2024
Severe Thunderstorm Warning 28, NWS Missoula, MT
NWS Missoula, MT issued this severe thunderstorm warning at Aug 23, 2024, 4:40 PM MDT for Lake County, Missoula County, Sanders County, Montana. It was in force for 35 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Aug 23, 2024, 4:40 PM MDT (22:40 UTC)
- Expired
- Aug 23, 2024, 5:15 PM MDT
- In force
- 35 min
- Issued by
- NWS Missoula, MT
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Lake County, MT, Missoula County, MT, Sanders County, MT
The radar
The Missoula radar (KMSX), 55 km from the middle of the area, began a volume at 22:44 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 watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Aug 23, 2:54 PM MDT | Severe Thunderstorm Watch | SPC | 6 hr |
The nearest sounding before it
Spokane, WA (KOTX), launched 12:00Z, 10.7 hours before the alert went out and 154 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
- 2000 m above ground
- 0-6 km bulk shear
- 32 kt
- 0-1 km storm-relative helicity
- 68 m²/s²
- 0-3 km storm-relative helicity
- 150 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
What forecasters said that day
The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Missoula, MT wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 23, 1:39 PM MDT, 3 hours 1 minute earlier.
Area forecast discussion, Aug 23, 1:39 PM MDT, 3 hours 1 minute before
Area Forecast Discussion
National Weather Service Missoula MT
139 PM MDT Fri Aug 23 2024
.DISCUSSION...The cold front associated with the large low
pressure system off the Pacific Northwest coast is already causing
showers and thunderstorms to develop across central Idaho. Storms
will continue to increase in coverage and intensity as they move
northward into north central Idaho and western Montana. Storms
will be capable of producing erratic wind gusts up to 60 mph,
hail, and heavy rain.
Also, strong southerly winds have developed across Lemhi County
into southwest Montana. A wind advisory has been issued for Lemhi
County until 9pm MDT tonight as gusts up to 45 mph will continue.
The low pressure system will track over the top of the Northern
Rockies this weekend, causing significantly cooler temperatures
as most valleys will be in the 60s and 70s. The evolution of the
low pressure system will cause moisture to become fairly limited.
North central Idaho and west central Montana have the best
probability to receive some additional rainfall over the weekend.
Areas south of the line from Lookout pass to Seeley Lake over to
Rogers pass now have a 50% to 80% chance of receiving a tenth
(0.10") of rain over 48hrs ending Monday morning.
Westerly flow is still expected to develop over the Northern
Rockies for Monday and Tuesday allowing for a warming and drying
trend. Temperatures should be near seasonal averages by Tuesday
afternoon.
All the models are showing a dry cold front pushing through the
region sometime Wednesday/Thursday. This front will bring breezy
conditions to the region along with temperatures once again drop
below average for this time of year. After the passage of the
front a ridge of high pressure builds over the region by the
weekend.
&&
.AVIATION...Increasing south or southeasterly winds gusting to
25-40 knots will continue early this afternoon before shifting to
the west by about 24/0000Z along a frontal passage. Shear and
instability will also increase as a disturbance lifts across the
Northern Rockies and interacts with monsoonal moisture. Scattered
thunderstorms look to initiate around 23/20Z and quickly spread
northward. Some storms could become severe (about 15 percent
chance for KMSO and KGPI; 5% chance for all other airfields),
capable of damaging winds (above 50 knots) and one inch diameter
hail. Winds and thunderstorms diminish quickly by sunset. Saturday
will bring increasing clouds and more widespread rain later in
the day.
&&
.MSO WATCHES/WARNINGS/ADVISORIES...
MT...Red Flag Warning until 9 PM MDT this evening for Deerlodge/West
Beaverhead...East Beaverhead.
ID...Wind Advisory until 9 PM MDT this evening for Eastern Lemhi
County...Western Lemhi County.
&&In the hours before
Local storm report, Aug 23, 4:24 PM MDT, 16 minutes before
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</html>The office that day
Everything else NWS Missoula, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 23, 7:04 AM MDT | Red Flag Warning | MSO | Beaverhead, Deer Lodge, Granite, Jefferson, Madison, Powell and 1 more | 13 hr |
| Aug 23, 2:15 PM MDT | Special Weather Statement | MSO | Ravalli | 60 min |
| Aug 23, 2:17 PM MDT | Special Weather Statement | MSO | Deer Lodge | 58 min |
| Aug 23, 2:21 PM MDT | Special Weather Statement | MSO | Mineral | 39 min |
| Aug 23, 2:49 PM MDT | Special Weather Statement | MSO | Deer Lodge | 26 min |
| Aug 23, 3:06 PM MDT | Special Weather Statement | MSO | Sanders | 24 min |
| Aug 23, 3:11 PM MDT | Special Weather Statement | MSO | Ravalli | 34 min |
| Aug 23, 3:17 PM MDT | Severe Thunderstorm Warning | MSO | Granite, Missoula, Ravalli | 28 min |
| Aug 23, 3:19 PM MDT | Special Weather Statement | MSO | Powell | 41 min |
| Aug 23, 3:38 PM MDT | Severe Thunderstorm Warning | MSO | Sanders | 37 min |
| Aug 23, 3:41 PM MDT | Severe Thunderstorm Warning | MSO | Granite, Missoula, Ravalli | 34 min |
| Aug 23, 3:54 PM MDT | Special Weather Statement | MSO | Powell | 51 min |
| Aug 23, 4:07 PM MDT | Special Weather Statement | MSO | Flathead | 68 min |
| Aug 23, 4:09 PM MDT | Severe Thunderstorm Warning | MSO | Lake, Mineral, Missoula, Sanders | 36 min |
| Aug 23, 4:12 PM MDT | Special Weather Statement | MSO | Sanders | 33 min |
| Aug 23, 4:26 PM MDT | Special Weather Statement | MSO | Sanders | 34 min |
| Aug 23, 4:27 PM MDT | Special Weather Statement | MSO | Sanders | 33 min |
| Aug 23, 4:28 PM MDT | Special Weather Statement | MSO | Sanders | 32 min |
| Aug 23, 4:53 PM MDT | Special Weather Statement | MSO | Sanders | 37 min |
| Aug 23, 4:58 PM MDT | Special Weather Statement | MSO | Lincoln | 32 min |
| Aug 23, 4:59 PM MDT | Special Weather Statement | MSO | Lincoln | 31 min |
| Aug 23, 5:01 PM MDT | Special Weather Statement | MSO | Lake | 29 min |
| Aug 23, 5:02 PM MDT | Special Weather Statement | MSO | Flathead | 28 min |
| Aug 23, 5:13 PM MDT | Severe Thunderstorm Warning | MSO | Flathead, Lake, Lincoln, Sanders | 32 min |
| Aug 23, 5:24 PM MDT | Special Weather Statement | MSO | Lincoln | 51 min |
| Aug 23, 5:38 PM MDT | Special Weather Statement | MSO | Lincoln | 37 min |
| Aug 23, 5:44 PM MDT | Special Weather Statement | MSO | Flathead | 31 min |
| Aug 23, 5:53 PM MDT | Special Weather Statement | MSO | Flathead | 37 min |
| Aug 23, 7:26 AM MDT | Wind Advisory | MSO | Lemhi | 12 hr |
| Aug 23, 1:48 PM MDT | Special Weather Statement | MSO | Lemhi | 27 min |
| Aug 23, 2:23 PM MDT | Special Weather Statement | MSO | Clearwater | 52 min |
Nearby
Severe Thunderstorm Warnings in Montana, 2024Every severe thunderstorm warning in 2024
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.