Alert archive / Montana / Special Weather Statements in 2021

Special Weather Statement, NWS Billings, MT

August 5, 2021Park County, Montana

NWS Billings, MT issued this special weather statement at Aug 5, 2021, 4:57 PM MDT for Park County, Montana. It was in force for 48 min. 3 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Aug 5, 2021, 4:57 PM MDT (22:57 UTC)
Expired: Aug 5, 2021, 5:45 PM MDT
In force: 48 min
Issued by: NWS Billings, MT
Hail: 0.00 in
Wind: 55

County Park County, MT

The radar

The Billings radar (KBLX), 147 km from the middle of the area, began a volume at 22:59 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.

What was reported inside it

Time	Report	Where
Aug 5, 5:08 PM MDT	TSTM WND GST 65	6 Ene Livingston, MT
Aug 5, 5:15 PM MDT	TSTM WND GST 60	2 Wsw Livingston, MT
Aug 5, 5:21 PM MDT	TSTM WND GST 57	3 Ene Livingston, MT

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Great_falls, MT (KTFX), launched 12:00Z, 11.0 hours before the alert went out and 207 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1584 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 23 m²/s²
0-3 km storm-relative helicity: 142 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

445 
WWUS85 KBYZ 052257
SPSBYZ

Special Weather Statement
National Weather Service Billings MT
457 PM MDT Thu Aug 5 2021
 
MTZ064-065-052345-
Paradise Valley MT-Livingston Area MT-
457 PM MDT Thu Aug 5 2021

...A strong thunderstorm will impact portions of central Park County
through 545 PM MDT...

At 456 PM MDT, Doppler radar was tracking a strong thunderstorm 9
miles south of Livingston, moving northeast at 30 mph.

HAZARD...Wind gusts of 45 to 55 mph, and brief heavy rain.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around 
         unsecured objects.

Locations impacted include...
Livingston and Pine Creek. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building. 

&&

LAT...LON 4557 11076 4560 11058 4561 11074 4578 11066
      4578 11022 4565 11024 4564 11029 4563 11036
      4560 11031 4562 11025 4557 11027 4557 11028
      4558 11028 4563 11043 4560 11051 4561 11056
      4557 11049 4541 11059 4547 11075
TIME...MOT...LOC 2256Z 207DEG 27KT 4553 11062 

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...55 MPH

$$

Lester

The office that day

Everything else NWS Billings, MT issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 4, 6:02 PM MDT	Special Weather Statement	BYZ	Prairie	43 min
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, 5:48 PM MDT	Special Weather Statement	BYZ	Sweet Grass	42 min

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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.