Alert archive / Montana / Severe Thunderstorm Warnings in 2024

Severe Thunderstorm Warning 17, NWS Missoula, MT

August 15, 2024Ravalli County, Montana

NWS Missoula, MT issued this severe thunderstorm warning at Aug 15, 2024, 4:31 PM MDT for Ravalli County, Montana. It was in force for 44 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 15, 2024, 4:31 PM MDT (22:31 UTC)
Expired
Aug 15, 2024, 5:15 PM MDT
In force
44 min
Issued by
NWS Missoula, MT
Area
Storm-based polygon
Hail
0.75 in
Wind
60.0 mph

County Ravalli County, MT

The radar

The Missoula radar (KMSX), 107 km from the middle of the area, began a volume at 22:32 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 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 15, 12:57 PM MDT, 3 hours 34 minutes earlier.

Area forecast discussion, Aug 15, 12:57 PM MDT, 3 hours 34 minutes before
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In the hours before

Special weather statement, Aug 15, 3:19 PM MDT, 1 hour 12 minutes before
Special Weather Statement
National Weather Service Missoula MT
319 PM MDT Thu Aug 15 2024

IDZ009-010-MTZ006-152200-
Eastern Lemhi County ID-Western Lemhi County ID-
Bitterroot/Sapphire Mountains MT-
319 PM MDT Thu Aug 15 2024

...Strong thunderstorms will impact portions of northwestern Lemhi
and southern Ravalli Counties through 400 PM MDT...

At 319 PM MDT, Doppler radar was tracking strong thunderstorms along
a line extending from 22 miles southwest of North Fork to near
Salmon. Movement was northeast at 25 mph.

HAZARD...Wind gusts up to 50 mph.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects.

Locations impacted include...
North Fork, Carmen, Leesburg, and Shoup.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

These storms may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

&&

LAT...LON 4524 11441 4549 11428 4539 11373 4536 11373
      4514 11401
TIME...MOT...LOC 2119Z 231DEG 21KT 4523 11438 4519 11396

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...50 MPH

AL
Special weather statement, Aug 15, 3:47 PM MDT, 44 minutes before
Special Weather Statement
National Weather Service Missoula MT
347 PM MDT Thu Aug 15 2024

IDZ009-010-MTZ005-006-152230-
Eastern Lemhi County ID-Western Lemhi County ID-
Bitterroot/Sapphire Mountains MT-Missoula/Bitterroot Valleys MT-
347 PM MDT Thu Aug 15 2024

...Strong thunderstorms will impact portions of northern Lemhi and
southern Ravalli Counties through 430 PM MDT...

At 346 PM MDT, Doppler radar was tracking strong thunderstorms along
a line extending from 14 miles south of Conner to 17 miles northeast
of Gibbonsville. Movement was north at 30 mph.

HAZARD...Wind gusts up to 50 mph.

SOURCE...Gusts of 40 to 50 mph observed across Lemhi County.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects.

Locations impacted include...
Darby, Conner, Sula, Lost Trail Pass, and Como.

This includes Highway 93 S between mile markers 0 and 35.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

These storms may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

&&

LAT...LON 4585 11360 4584 11370 4575 11383 4575 11385
      4578 11387 4575 11391 4570 11391 4570 11394
      4565 11391 4564 11436 4610 11437 4609 11381
      4601 11381 4590 11359
TIME...MOT...LOC 2146Z 182DEG 28KT 4573 11421 4576 11373

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...50 MPH

AL
Special weather statement, Aug 15, 4:13 PM MDT, 18 minutes before
Special Weather Statement
National Weather Service Missoula MT
413 PM MDT Thu Aug 15 2024

MTZ005-006-043-152230-
Bitterroot/Sapphire Mountains MT-Missoula/Bitterroot Valleys MT-
Potomac/Seeley Lake Region MT-
413 PM MDT Thu Aug 15 2024

...A strong thunderstorm will impact portions of southeastern
Missoula County through 430 PM MDT...

At 412 PM MDT, Doppler radar was tracking a strong thunderstorm over
Bonner-West Riverside, or 7 miles east of Missoula, moving north at
15 mph.

HAZARD...Winds in excess of 30 mph and half-inch size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor damage to outdoor objects is
         possible.

Locations impacted include...
Missoula, Bonner-West Riverside, East Missoula, and Turah.

This includes the following highways...
 Interstate 90 between mile markers 107 and 115.
 Highway 200 E between mile markers 0 and 5.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with this storm and may lead to
localized flooding. Do not drive your vehicle through flooded
roadways.

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

&&

LAT...LON 4681 11376 4679 11390 4694 11401 4698 11377
TIME...MOT...LOC 2212Z 159DEG 14KT 4686 11386

MAX HAIL SIZE...0.50 IN
MAX WIND GUST...30 MPH

AL

The office that day

Everything else NWS Missoula, MT issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 15, 3:47 PM MDTSpecial Weather StatementMSORavalli43 min
Aug 15, 4:13 PM MDTSpecial Weather StatementMSOMissoula17 min
Aug 15, 3:19 PM MDTSpecial Weather StatementMSOLemhi41 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; radar from the NEXRAD Level II archive.