Alert archive / Montana / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 11, NWS Missoula, MT
NWS Missoula, MT issued this severe thunderstorm warning at Aug 4, 2021, 8:03 PM MDT for Lake County, Montana. It was in force for 27 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Aug 4, 2021, 8:03 PM MDT (02:03 UTC)
- Expired
- Aug 4, 2021, 8:30 PM MDT
- In force
- 27 min
- Issued by
- NWS Missoula, MT
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 50.0 mph
County Lake County, MT
The radar
The Missoula radar (KMSX), 83 km from the middle of the area, began a volume at 02:05 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
Spokane, WA (KOTX), launched 00:00Z, 2.1 hours before the alert went out and 171 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
- 502 J/kg
- Mixed-layer CIN
- -9 J/kg
- Mixed-layer LCL
- 3045 m above ground
- 0-6 km bulk shear
- 28 kt
- 0-1 km storm-relative helicity
- 29 m²/s²
- 0-3 km storm-relative helicity
- 58 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.3
The text
As transmitted.
081 WUUS55 KMSO 050203 SVRMSO MTC047-050230- /O.NEW.KMSO.SV.W.0011.210805T0203Z-210805T0230Z/ BULLETIN - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Warning National Weather Service Missoula MT 803 PM MDT Wed Aug 4 2021 The National Weather Service in Missoula has issued a * Severe Thunderstorm Warning for... Central Lake County in northwestern Montana... * Until 830 PM MDT. * At 803 PM MDT, a severe thunderstorm was located over Kings Point, or near Polson, moving east at 25 mph. HAZARD...Quarter size hail. SOURCE...Radar indicated. IMPACT...Damage to vehicles is expected. * Locations impacted include... Kings Point and Finley Point. PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a building. If on or near Flathead Lake, get away from the water and move indoors or inside a vehicle. Remember, lightning can strike out to 15 miles from the parent thunderstorm. If you can hear thunder, you are close enough to be struck by lightning. Move to safe shelter now! Do not be caught on the water in a thunderstorm. && LAT...LON 4776 11423 4783 11421 4784 11396 4773 11395 TIME...MOT...LOC 0203Z 275DEG 21KT 4779 11415 HAIL THREAT...RADAR INDICATED MAX HAIL SIZE...1.00 IN WIND THREAT...RADAR INDICATED MAX WIND GUST...<50 MPH $$
4 follow-up statements
410
WWUS55 KMSO 050205
SVSMSO
Severe Weather Statement
National Weather Service Missoula MT
805 PM MDT Wed Aug 4 2021
MTC047-050230-
/O.CON.KMSO.SV.W.0011.000000T0000Z-210805T0230Z/
Lake MT-
805 PM MDT Wed Aug 4 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 830 PM MDT
FOR CENTRAL LAKE COUNTY...
At 805 PM MDT, a severe thunderstorm was located over Kings Point, or
near Polson, moving east at 25 mph.
HAZARD...Ping pong ball size hail.
SOURCE...Radar indicated.
IMPACT...People and animals outdoors will be injured. Expect damage
to roofs, siding, windows, and vehicles.
Locations impacted include...
Kings Point and Finley Point.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
If on or near Flathead Lake, get away from the water and move
indoors or inside a vehicle. remember, lightning can strike out to
15 miles from the parent thunderstorm. If you can hear thunder, you
are close enough to be struck by lightning. Move to safe shelter
now! Do not be caught on the water in a thunderstorm.
&&
LAT...LON 4776 11422 4782 11419 4784 11396 4773 11395
TIME...MOT...LOC 0205Z 275DEG 21KT 4779 11413
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.50 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...<50 MPH
$$876
WWUS55 KMSO 050215
SVSMSO
Severe Weather Statement
National Weather Service Missoula MT
815 PM MDT Wed Aug 4 2021
MTC047-050230-
/O.CON.KMSO.SV.W.0011.000000T0000Z-210805T0230Z/
Lake MT-
815 PM MDT Wed Aug 4 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 830 PM MDT
FOR CENTRAL LAKE COUNTY...
At 815 PM MDT, a severe thunderstorm was located near Kings Point, or
8 miles northeast of Polson, moving east at 25 mph.
HAZARD...Ping pong ball size hail.
SOURCE...Radar indicated.
IMPACT...People and animals outdoors will be injured. Expect damage
to roofs, siding, windows, and vehicles.
Locations impacted include...
Finley Point.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
If on or near Flathead Lake, get away from the water and move
indoors or inside a vehicle. remember, lightning can strike out to
15 miles from the parent thunderstorm. If you can hear thunder, you
are close enough to be struck by lightning. Move to safe shelter
now! Do not be caught on the water in a thunderstorm.
&&
LAT...LON 4775 11413 4781 11413 4783 11396 4773 11395
TIME...MOT...LOC 0215Z 275DEG 21KT 4778 11404
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.50 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...<50 MPH
$$781
WWUS55 KMSO 050219
SVSMSO
Severe Weather Statement
National Weather Service Missoula MT
819 PM MDT Wed Aug 4 2021
MTC047-050230-
/O.CON.KMSO.SV.W.0011.000000T0000Z-210805T0230Z/
Lake MT-
819 PM MDT Wed Aug 4 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 830 PM MDT
FOR NORTHEASTERN LAKE COUNTY...
At 819 PM MDT, a severe thunderstorm was located near Kings Point, or
9 miles northeast of Polson, moving east at 25 mph.
HAZARD...Golf ball size hail.
SOURCE...Radar indicated.
IMPACT...People and animals outdoors will be injured. Expect damage
to roofs, siding, windows, and vehicles.
Locations impacted include...
Finley Point.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
This storm is producing large hail. SEEK SHELTER NOW inside a sturdy
structure and stay away from windows.
If on or near Flathead Lake, get away from the water and move
indoors or inside a vehicle. remember, lightning can strike out to
15 miles from the parent thunderstorm. If you can hear thunder, you
are close enough to be struck by lightning. Move to safe shelter
now! Do not be caught on the water in a thunderstorm.
&&
LAT...LON 4775 11409 4781 11410 4783 11396 4773 11395
TIME...MOT...LOC 0219Z 275DEG 21KT 4778 11401
THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...<50 MPH
$$086
WWUS55 KMSO 050227
SVSMSO
Severe Weather Statement
National Weather Service Missoula MT
827 PM MDT Wed Aug 4 2021
MTC047-050237-
/O.EXP.KMSO.SV.W.0011.000000T0000Z-210805T0230Z/
Lake MT-
827 PM MDT Wed Aug 4 2021
...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN LAKE COUNTY WILL
EXPIRE AT 830 PM MDT...
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire.
LAT...LON 4775 11409 4781 11410 4783 11396 4773 11395
TIME...MOT...LOC 0227Z 275DEG 21KT 4778 11399
$$The office that day
Everything else NWS Missoula, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 4, 6:21 PM MDT | Special Weather Statement | MSO | Flathead | 24 min |
| Aug 4, 6:31 PM MDT | Special Weather Statement | MSO | Lake | 14 min |
| Aug 4, 7:57 PM MDT | Special Weather Statement | MSO | Lake | 18 min |
| Aug 4, 8:26 PM MDT | Severe Thunderstorm Warning | MSO | Lake | 34 min |
| Aug 5, 2:27 PM MDT | Special Weather Statement | MSO | Mineral, Ravalli | 33 min |
| Aug 5, 3:20 PM MDT | Special Weather Statement | MSO | Granite, Ravalli | 55 min |
| Aug 5, 4:12 PM MDT | Special Weather Statement | MSO | Deer Lodge, Silver Bow | 48 min |
| Aug 5, 4:19 PM MDT | Special Weather Statement | MSO | Ravalli | 56 min |
| Aug 5, 5:03 PM MDT | Severe Thunderstorm Warning | MSO | Powell | 42 min |
Nearby
Severe Thunderstorm Warnings in Montana, 2021Every severe thunderstorm 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.