Alert archive / Montana / Special Weather Statements in 2021

Special Weather Statement, NWS Billings, MT

July 15, 2021Park County, Montana

NWS Billings, MT issued this special weather statement at Jul 15, 2021, 9:31 PM MDT for Park County, Montana. It was in force for 29 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 15, 2021, 9:31 PM MDT (03:31 UTC)
Expired: Jul 15, 2021, 10:00 PM MDT
In force: 29 min
Issued by: NWS Billings, MT

County Park County, MT

The radar

The Billings radar (KBLX), 148 km from the middle of the area, began a volume at 03:33 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

Great_falls, MT (KTFX), launched 00:00Z, 3.5 hours before the alert went out and 206 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: 228 J/kg
Mixed-layer CIN: -48 J/kg
Mixed-layer LCL: 3908 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 34 m²/s²
0-3 km storm-relative helicity: 70 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.5

Open this sounding in Storm Lab

The text

As transmitted.

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What forecasters said that day

The local office's own words before this special weather statement went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Billings, MT wrote its last area forecast discussion before this special weather statement went out at Jul 15, 8:34 PM MDT, 57 minutes earlier.

Area forecast discussion, Jul 15, 8:34 PM MDT, 57 minutes before

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Hazardous weather outlook, Jul 15, 12:50 PM MDT, 8 hours 41 minutes before

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In the hours before

Special weather statement, Jul 15, 9:31 PM MDT, 0 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 16, 11:06 AM MDT	Excessive Heat Warning	BYZ	Big Horn, Carbon, Carter, Custer, Fallon, Golden Valley and 6 more	6 days
Jul 16, 3:14 PM MDT	Heat Advisory	BYZ	Carbon, Golden Valley, Park, Stillwater, Sweet Grass, Wheatland	3 days
Jul 16, 3:50 PM MDT	Special Weather Statement	BYZ	Stillwater	40 min
Jul 16, 4:28 PM MDT	Special Weather Statement	BYZ	Yellowstone	47 min
Jul 16, 4:49 PM MDT	Severe Thunderstorm Warning	BYZ	Yellowstone	41 min
Jul 16, 5:35 PM MDT	Special Weather Statement	BYZ	Sheridan	55 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.