Alert archive / Montana / Special Weather Statements in 2021
Special Weather Statement, NWS Billings, MT
NWS Billings, MT issued this special weather statement at Aug 4, 2021, 6:02 PM MDT for Prairie County, Montana. It was in force for 43 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, 6:02 PM MDT (00:02 UTC)
- Expired
- Aug 4, 2021, 6:45 PM MDT
- In force
- 43 min
- Issued by
- NWS Billings, MT
- Hail
- 0.50 in
- Wind
- 40
County Prairie County, MT
The radar
The Glasgow radar (KGGW), 177 km from the middle of the area, began a volume at 00:04 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, 0.0 hours before the alert went out and 178 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
- 133 J/kg
- Mixed-layer CIN
- -88 J/kg
- Mixed-layer LCL
- 2787 m above ground
- 0-6 km bulk shear
- 15 kt
- 0-1 km storm-relative helicity
- -18 m²/s²
- 0-3 km storm-relative helicity
- 13 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
792
WWUS85 KBYZ 050002
SPSBYZ
Special Weather Statement
National Weather Service Billings MT
602 PM MDT Wed Aug 4 2021
MTZ032-050045-
Custer MT-
602 PM MDT Wed Aug 4 2021
...A strong thunderstorm will impact portions of northwestern Custer
County through 645 PM MDT...
At 601 PM MDT, Doppler radar was tracking a strong thunderstorm 20
miles east of Hillside, or 30 miles north of Miles City, moving
southeast at 35 mph.
HAZARD...Heavy rainfall, winds in excess of 40 mph and half inch
hail.
SOURCE...Radar indicated.
IMPACT...Heavy rain could cause ponding of water on roads. Gusty
winds could knock down tree limbs and blow around unsecured
objects. Minor damage to outdoor objects is possible.
Locations impacted include...
Matthews Recreation Area and Strawberry Hill Recreation Area.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
Torrential rainfall is also occurring with this storm and may lead to
localized flooding. Do not drive your vehicle through flooded
roadways.
&&
LAT...LON 4686 10583 4683 10583 4683 10571 4679 10561
4675 10562 4674 10557 4666 10558 4666 10550
4660 10549 4660 10545 4657 10544 4637 10565
4678 10613 4683 10612 4683 10608 4686 10608
TIME...MOT...LOC 0001Z 306DEG 29KT 4684 10599
MAX HAIL SIZE...0.50 IN
MAX WIND GUST...40 MPH
$$
ArthurThe office that day
Everything else NWS Billings, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 4, 6:46 PM MDT | Special Weather Statement | BYZ | Wheatland | 44 min |
| Aug 5, 3:21 PM MDT | Special Weather Statement | BYZ | Park | 39 min |
| Aug 5, 4:02 PM MDT | Special Weather Statement | BYZ | Park | 43 min |
| Aug 5, 4:23 PM MDT | Special Weather Statement | BYZ | Park | 37 min |
| Aug 5, 4:57 PM MDT | Special Weather Statement | BYZ | Park | 48 min |
| Aug 5, 5:48 PM MDT | Special Weather Statement | BYZ | Sweet Grass | 42 min |
Nearby
Special Weather Statements in Montana, 2021Every special weather statement 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.