Alert archive / Montana / Special Weather Statements in 2021

Special Weather Statement, NWS Billings, MT

August 4, 2021Carter County, Custer County, Fallon County, Montana

NWS Billings, MT issued this special weather statement at Aug 4, 2021, 4:26 PM MDT for Carter County, Custer County, Fallon County, Montana. It was in force for 49 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, 4:26 PM MDT (22:26 UTC)
Expired: Aug 4, 2021, 5:15 PM MDT
In force: 49 min
Issued by: NWS Billings, MT
Hail: 0.50 in
Wind: 50

Counties Carter County, MT, Custer County, MT, Fallon County, MT

The radar

The Glasgow radar (KGGW), 211 km from the middle of the area, began a volume at 22:26 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 12:00Z, 10.4 hours before the alert went out and 212 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 606 J/kg
Mixed-layer CIN: -145 J/kg
Mixed-layer LCL: 1810 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 46 m²/s²
0-3 km storm-relative helicity: 7 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

417 
WWUS85 KBYZ 042226
SPSBYZ

Special Weather Statement
National Weather Service Billings MT
426 PM MDT Wed Aug 4 2021
 
MTZ031>033-036-037-042315-
Custer MT-Northern Rosebud MT-Powder River MT-Fallon MT-Carter MT-
426 PM MDT Wed Aug 4 2021

...Strong thunderstorms will impact portions of Fallon, Custer, 
Carter, northeastern Powder River and northern Rosebud Counties 
through 515 PM MDT...

At 423 PM MDT, Doppler radar was tracking strong thunderstorms over 
the area, moving southeast at 25 mph.

HAZARD...Heavy rainfall, wind gusts up to 50 mph and half inch hail.

SOURCE...Radar indicated.

IMPACT...Heavy rainfall could create poor visibility and 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...
Miles City, Baker, Ekalaka, Ridgeway, Rosebud, Plevna, Ismay, Locate,
Angela, Westmore, Cartersville, Mill Iron, Hathaway, Medicine Rocks
State Park, Capitol, Knowlton, Matthews Recreation Area, Strawberry
Hill Recreation Area, Willard and Webster.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building. 

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

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 4640 10678 4685 10620 4686 10608 4683 10562
      4666 10558 4666 10550 4657 10544 4654 10524
      4654 10499 4668 10460 4662 10425 4651 10404
      4501 10404
TIME...MOT...LOC 2223Z 305DEG 23KT 4587 10453 

MAX HAIL SIZE...0.50 IN
MAX WIND GUST...50 MPH

$$

Arthur

Nearby

Special Weather Statements in Montana, 2021 Every 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.