Alert archive / Montana / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 49, NWS Billings, MT
NWS Billings, MT issued this severe thunderstorm warning at Aug 26, 2021, 7:21 PM MDT for Big Horn County, Montana. It was in force for 54 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 26, 2021, 7:21 PM MDT (01:21 UTC)
- Expired
- Aug 26, 2021, 8:15 PM MDT
- In force
- 54 min
- Issued by
- NWS Billings, MT
- Area
- Storm-based polygon
- Hail
- 1.25 in
- Wind
- 60.0 mph
County Big Horn County, MT
The radar
The Billings radar (KBLX), 58 km from the middle of the area, began a volume at 01:23 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.
The nearest sounding before it
Riverton, WY (KRIW), launched 00:00Z, 1.4 hours before the alert went out and 263 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
- 154 J/kg
- Mixed-layer CIN
- -30 J/kg
- Mixed-layer LCL
- 3406 m above ground
- 0-6 km bulk shear
- 49 kt
- 0-1 km storm-relative helicity
- 14 m²/s²
- 0-3 km storm-relative helicity
- 47 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
059
WUUS55 KBYZ 270121
SVRBYZ
MTC003-270215-
/O.NEW.KBYZ.SV.W.0049.210827T0121Z-210827T0215Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Billings MT
721 PM MDT Thu Aug 26 2021
The National Weather Service in Billings has issued a
* Severe Thunderstorm Warning for...
Western Big Horn County in south central Montana...
* Until 815 PM MDT.
* At 721 PM MDT, a severe thunderstorm was located 14 miles east of
Pryor, or 29 miles southeast of Billings, moving east at 15 mph.
HAZARD...60 mph wind gusts and half dollar size hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect wind damage
to roofs, siding, and trees.
* Locations impacted include...
Fort Smith, Bighorn Lake and Crow Indian Reservation.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4535 10834 4546 10832 4549 10832 4549 10820
4552 10819 4552 10781 4526 10785
TIME...MOT...LOC 0121Z 277DEG 13KT 4543 10822
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.25 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Carrothers2 follow-up statements
619
WWUS55 KBYZ 270147
SVSBYZ
Severe Weather Statement
National Weather Service Billings MT
747 PM MDT Thu Aug 26 2021
MTC003-270215-
/O.CON.KBYZ.SV.W.0049.000000T0000Z-210827T0215Z/
Big Horn MT-
747 PM MDT Thu Aug 26 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 815 PM MDT
FOR WESTERN BIG HORN COUNTY...
At 747 PM MDT, a severe thunderstorm was located 10 miles northwest
of Fort Smith, or 31 miles southwest of Hardin, moving east at 15
mph.
HAZARD...60 mph wind gusts and half dollar size hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect wind damage to
roofs, siding, and trees.
Locations impacted include...
Crow Indian Reservation.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4539 10821 4552 10819 4552 10781 4532 10784
TIME...MOT...LOC 0147Z 277DEG 13KT 4542 10809
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.25 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Carrothers731
WWUS55 KBYZ 270206
SVSBYZ
Severe Weather Statement
National Weather Service Billings MT
806 PM MDT Thu Aug 26 2021
MTC003-270216-
/O.EXP.KBYZ.SV.W.0049.000000T0000Z-210827T0215Z/
Big Horn MT-
806 PM MDT Thu Aug 26 2021
...THE SEVERE THUNDERSTORM WARNING FOR WESTERN BIG HORN COUNTY WILL
EXPIRE AT 815 PM MDT...
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning will be allowed to expire. However heavy rain
is still possible with this thunderstorm.
LAT...LON 4539 10821 4552 10819 4552 10781 4532 10784
TIME...MOT...LOC 0206Z 277DEG 13KT 4541 10799
$$
CarrothersThe office that day
Everything else NWS Billings, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 26, 6:50 PM MDT | Special Weather Statement | BYZ | Musselshell | 25 min |
| Aug 26, 7:13 PM MDT | Special Weather Statement | BYZ | Treasure | 47 min |
| Aug 26, 7:15 PM MDT | Special Weather Statement | BYZ | Big Horn | 30 min |
| Aug 26, 7:58 PM MDT | Special Weather Statement | BYZ | Treasure | 62 min |
| Aug 26, 8:22 PM MDT | Special Weather Statement | BYZ | Big Horn | 23 min |
| Aug 26, 8:57 PM MDT | Special Weather Statement | BYZ | Rosebud | 63 min |
| Aug 26, 9:02 PM MDT | Special Weather Statement | BYZ | Big Horn | 28 min |
| Aug 26, 9:27 PM MDT | Special Weather Statement | BYZ | Big Horn | 33 min |
| Aug 26, 9:57 PM MDT | Special Weather Statement | BYZ | Custer, Rosebud | 63 min |
| Aug 26, 10:57 PM MDT | Special Weather Statement | BYZ | 63 min | |
| Aug 27, 2:48 PM MDT | Special Weather Statement | BYZ | Yellowstone | 42 min |
| Aug 27, 3:33 PM MDT | Special Weather Statement | BYZ | Carter | 42 min |
| Aug 27, 4:14 PM MDT | Special Weather Statement | BYZ | Carter | 31 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.