Alert archive / Montana / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 28, NWS Great Falls, MT
NWS Great Falls, MT issued this severe thunderstorm warning at Jul 6, 2021, 7:27 PM MDT for Blaine County, Montana. It was in force for 63 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
- Jul 6, 2021, 7:27 PM MDT (01:27 UTC)
- Expired
- Jul 6, 2021, 8:30 PM MDT
- In force
- 63 min
- Issued by
- NWS Great Falls, MT
- Area
- Storm-based polygon
- Hail
- 1.75 in
- Wind
- 60.0 mph
County Blaine County, MT
The radar
The Glasgow radar (KGGW), 144 km from the middle of the area, began a volume at 01:30 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
Glasgow Intl Airport, MT (KGGW), launched 00:00Z, 1.5 hours before the alert went out and 145 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
- 20 J/kg
- Mixed-layer CIN
- -155 J/kg
- Mixed-layer LCL
- 1401 m above ground
- 0-6 km bulk shear
- 54 kt
- 0-1 km storm-relative helicity
- -5 m²/s²
- 0-3 km storm-relative helicity
- 134 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted.
691
WUUS55 KTFX 070127
SVRTFX
MTC005-070230-
/O.NEW.KTFX.SV.W.0028.210707T0127Z-210707T0230Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Great Falls MT
727 PM MDT Tue Jul 6 2021
The National Weather Service in Great Falls has issued a
* Severe Thunderstorm Warning for...
Northern Blaine County in north central Montana...
* Until 830 PM MDT.
* At 726 PM MDT, severe thunderstorms were located along a line
extending from 12 miles north of Turner to 25 miles north of
Harlem, moving southeast at 20 mph.
HAZARD...Golf ball size hail and 60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...People and animals outdoors will be injured. Expect hail
damage to roofs, siding, windows, and vehicles. Expect
wind damage to roofs, siding, and trees.
* Locations impacted include...
Harlem, Fort Belknap, Turner, Hogeland and Zurich.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Intense thunderstorm lines can produce brief tornadoes and widespread
significant wind damage. Although a tornado is not immediately
likely, it is best to move to an interior room on the lowest floor of
a building. These storms may cause serious injury and significant
property damage.
&&
LAT...LON 4892 10824 4891 10826 4875 10826 4874 10832
4858 10831 4856 10835 4844 10835 4844 10842
4811 10844 4869 10929 4900 10896 4900 10823
TIME...MOT...LOC 0126Z 317DEG 20KT 4903 10838 4888 10891
HAIL...1.75IN
WIND...60MPH
$$
RCG5 follow-up statements
575
WWUS55 KTFX 070143
SVSTFX
Severe Weather Statement
National Weather Service Great Falls MT
743 PM MDT Tue Jul 6 2021
MTC005-070230-
/O.CON.KTFX.SV.W.0028.000000T0000Z-210707T0230Z/
Blaine MT-
743 PM MDT Tue Jul 6 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 830 PM MDT
FOR NORTHERN BLAINE COUNTY...
At 743 PM MDT, severe thunderstorms were located along a line
extending from 9 miles northeast of Turner to 19 miles north of
Harlem, moving southeast at 25 mph.
HAZARD...Golf ball size hail and 60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...People and animals outdoors will be injured. Expect hail
damage to roofs, siding, windows, and vehicles. Expect wind
damage to roofs, siding, and trees.
Locations impacted include...
Harlem, Fort Belknap, Turner, Hogeland and Zurich.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Intense thunderstorm lines can produce brief tornadoes and widespread
significant wind damage. Although a tornado is not immediately
likely, it is best to move to an interior room on the lowest floor of
a building. These storms may cause serious injury and significant
property damage.
&&
LAT...LON 4892 10824 4891 10826 4875 10826 4874 10832
4858 10831 4856 10835 4844 10835 4844 10842
4811 10844 4869 10929 4891 10880 4900 10850
4900 10823
TIME...MOT...LOC 0143Z 317DEG 20KT 4896 10829 4882 10882
HAIL...1.75IN
WIND...60MPH
$$
RCG711
WWUS55 KTFX 070152
SVSTFX
Severe Weather Statement
National Weather Service Great Falls MT
752 PM MDT Tue Jul 6 2021
MTC005-070230-
/O.CON.KTFX.SV.W.0028.000000T0000Z-210707T0230Z/
Blaine MT-
752 PM MDT Tue Jul 6 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 830 PM MDT
FOR NORTHEASTERN BLAINE COUNTY...
At 751 PM MDT, severe thunderstorms were located along a line
extending from 9 miles northeast of Turner to 17 miles north of
Harlem, moving southeast at 25 mph.
HAZARD...Golf ball size hail and 60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...People and animals outdoors will be injured. Expect hail
damage to roofs, siding, windows, and vehicles. Expect wind
damage to roofs, siding, and trees.
Locations impacted include...
Harlem, Fort Belknap, Turner, Hogeland and Zurich.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Intense thunderstorm lines can produce brief tornadoes and widespread
significant wind damage. Although a tornado is not immediately
likely, it is best to move to an interior room on the lowest floor of
a building. These storms may cause serious injury and significant
property damage.
&&
LAT...LON 4892 10824 4891 10826 4875 10826 4874 10832
4858 10831 4856 10835 4844 10835 4844 10842
4811 10844 4853 10905 4874 10903 4888 10871
4900 10841 4900 10823
TIME...MOT...LOC 0151Z 317DEG 20KT 4894 10825 4879 10878
HAIL...1.75IN
WIND...60MPH
$$
RCG318
WWUS55 KTFX 070202
SVSTFX
Severe Weather Statement
National Weather Service Great Falls MT
802 PM MDT Tue Jul 6 2021
MTC005-070230-
/O.CON.KTFX.SV.W.0028.000000T0000Z-210707T0230Z/
Blaine MT-
802 PM MDT Tue Jul 6 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 830 PM MDT
FOR NORTHEASTERN BLAINE COUNTY...
At 802 PM MDT, severe thunderstorms were located along a line
extending from 10 miles east of Turner to 14 miles north of Harlem,
moving southeast at 25 mph.
HAZARD...Golf ball size hail and 60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...People and animals outdoors will be injured. Expect hail
damage to roofs, siding, windows, and vehicles. Expect wind
damage to roofs, siding, and trees.
Locations impacted include...
Harlem, Fort Belknap and Turner.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Intense thunderstorm lines can produce brief tornadoes and widespread
significant wind damage. Although a tornado is not immediately
likely, it is best to move to an interior room on the lowest floor of
a building. These storms may cause serious injury and significant
property damage.
&&
LAT...LON 4892 10824 4891 10826 4875 10826 4874 10832
4858 10831 4856 10835 4844 10835 4844 10842
4811 10844 4844 10891 4858 10887 4869 10885
4883 10850 4895 10824 4900 10823
TIME...MOT...LOC 0202Z 317DEG 20KT 4889 10819 4874 10871
HAIL...1.75IN
WIND...60MPH
$$
RCG952
WWUS55 KTFX 070210
SVSTFX
Severe Weather Statement
National Weather Service Great Falls MT
810 PM MDT Tue Jul 6 2021
MTC005-070230-
/O.CON.KTFX.SV.W.0028.000000T0000Z-210707T0230Z/
Blaine MT-
810 PM MDT Tue Jul 6 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 830 PM MDT
FOR EAST CENTRAL BLAINE COUNTY...
At 810 PM MDT, severe thunderstorms were located along a line
extending from 11 miles east of Turner to 13 miles north of Harlem,
moving southeast at 25 mph.
HAZARD...Golf ball size hail and 60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...People and animals outdoors will be injured. Expect hail
damage to roofs, siding, windows, and vehicles. Expect wind
damage to roofs, siding, and trees.
Locations impacted include...
Harlem and Fort Belknap.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Intense thunderstorm lines can produce brief tornadoes and widespread
significant wind damage. Although a tornado is not immediately
likely, it is best to move to an interior room on the lowest floor of
a building. These storms may cause serious injury and significant
property damage.
&&
LAT...LON 4861 10836 4859 10832 4858 10834 4858 10831
4856 10835 4844 10835 4844 10842 4811 10844
4844 10891 4858 10887 4869 10885 4871 10850
4859 10834
TIME...MOT...LOC 0210Z 317DEG 20KT 4887 10817 4872 10869
HAIL...1.75IN
WIND...60MPH
$$
RCG974
WWUS55 KTFX 070222
SVSTFX
Severe Weather Statement
National Weather Service Great Falls MT
822 PM MDT Tue Jul 6 2021
MTC005-070230-
/O.CON.KTFX.SV.W.0028.000000T0000Z-210707T0230Z/
Blaine MT-
822 PM MDT Tue Jul 6 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 830 PM MDT
FOR EAST CENTRAL BLAINE COUNTY...
At 822 PM MDT, severe thunderstorms were located along a line
extending from 12 miles west of Loring to 12 miles northeast of
Harlem, moving southeast at 25 mph.
HAZARD...Golf ball size hail and 60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...People and animals outdoors will be injured. Expect hail
damage to roofs, siding, windows, and vehicles. Expect wind
damage to roofs, siding, and trees.
Locations impacted include...
Fort Belknap.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Intense thunderstorm lines can produce brief tornadoes and widespread
significant wind damage. Although a tornado is not immediately
likely, it is best to move to an interior room on the lowest floor of
a building. These storms may cause serious injury and significant
property damage.
&&
LAT...LON 4857 10835 4856 10836 4854 10835 4844 10835
4844 10842 4812 10844 4837 10880 4854 10877
4858 10867 4865 10852 4858 10840
TIME...MOT...LOC 0222Z 317DEG 20KT 4884 10812 4869 10864
HAIL...1.75IN
WIND...60MPH
$$
RCGThe office that day
Everything else NWS Great Falls, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 6, 6:14 PM MDT | Severe Thunderstorm Warning | TFX | Blaine | 29 min |
| Jul 6, 6:16 PM MDT | Special Weather Statement | TFX | Toole | 29 min |
| Jul 6, 6:50 PM MDT | Severe Thunderstorm Warning | TFX | Blaine | 40 min |
| Jul 6, 6:57 PM MDT | Special Weather Statement | TFX | Toole | 33 min |
| Jul 6, 7:30 PM MDT | Special Weather Statement | TFX | Liberty | 30 min |
| Jul 6, 8:20 PM MDT | Tornado Warning | TFX | Blaine | 25 min |
| Jul 6, 8:45 PM MDT | Severe Thunderstorm Warning | TFX | Blaine | 19 min |
| Jul 7, 1:51 PM MDT | Special Weather Statement | TFX | Beaverhead | 39 min |
| Jul 7, 2:03 PM MDT | Special Weather Statement | TFX | Judith Basin | 27 min |
| Jul 7, 2:18 PM MDT | Special Weather Statement | TFX | Fergus | 27 min |
| Jul 7, 2:43 PM MDT | Special Weather Statement | TFX | Fergus | 32 min |
| Jul 7, 2:46 PM MDT | Severe Thunderstorm Warning | TFX | Fergus | 29 min |
| Jul 7, 2:55 PM MDT | Special Weather Statement | TFX | Madison | 50 min |
| Jul 7, 3:06 PM MDT | Special Weather Statement | TFX | Jefferson | 54 min |
| Jul 7, 3:13 PM MDT | Severe Thunderstorm Warning | TFX | Fergus | 47 min |
| Jul 7, 3:21 PM MDT | Special Weather Statement | TFX | Fergus | 24 min |
| Jul 7, 3:26 PM MDT | Severe Thunderstorm Warning | TFX | Jefferson, Lewis and Clark | 34 min |
| Jul 7, 3:36 PM MDT | Special Weather Statement | TFX | Fergus | 24 min |
| Jul 7, 3:40 PM MDT | Special Weather Statement | TFX | Lewis and Clark | 35 min |
| Jul 7, 3:46 PM MDT | Special Weather Statement | TFX | Broadwater, Jefferson | 44 min |
| Jul 7, 3:55 PM MDT | Special Weather Statement | TFX | Gallatin | 50 min |
| Jul 7, 3:59 PM MDT | Special Weather Statement | TFX | Fergus | 46 min |
| Jul 7, 4:02 PM MDT | Special Weather Statement | TFX | Broadwater, Jefferson | 43 min |
| Jul 7, 4:30 PM MDT | Severe Thunderstorm Warning | TFX | Gallatin | 30 min |
| Jul 7, 4:36 PM MDT | Severe Thunderstorm Warning | TFX | Gallatin | 15 min |
| Jul 7, 4:48 PM MDT | Special Weather Statement | TFX | Silver Bow | 27 min |
| Jul 7, 4:56 PM MDT | Special Weather Statement | TFX | Meagher | 34 min |
| Jul 7, 5:12 PM MDT | Special Weather Statement | TFX | Judith Basin | 48 min |
| Jul 7, 5:13 PM MDT | Special Weather Statement | TFX | Blaine | 62 min |
| Jul 7, 5:38 PM MDT | Severe Thunderstorm Warning | TFX | Blaine | 37 min |
| Jul 7, 5:56 PM MDT | Special Weather Statement | TFX | Blaine | 34 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.