Alert archive / Montana / Special Weather Statements in 2021

Special Weather Statement, NWS Great Falls, MT

February 24, 2021Blaine County, Montana

NWS Great Falls, MT issued this special weather statement at Feb 24, 2021, 2:16 AM MST for Blaine County, Montana. It was in force for 119 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: Feb 24, 2021, 2:16 AM MST (09:16 UTC)
Expired: Feb 24, 2021, 4:15 AM MST
In force: 119 min
Issued by: NWS Great Falls, MT

County Blaine County, MT

The radar

The Glasgow radar (KGGW), 167 km from the middle of the area, began a volume at 09:18 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, 9.3 hours before the alert went out and 141 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: 11 J/kg
Mixed-layer CIN: -5 J/kg
Mixed-layer LCL: 1741 m above ground
0-6 km bulk shear: 12 kt
0-1 km storm-relative helicity: -8 m²/s²
0-3 km storm-relative helicity: -5 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 Great Falls, MT wrote its last area forecast discussion before this special weather statement went out at Feb 23, 10:58 PM MST, 3 hours 18 minutes earlier.

Area forecast discussion, Feb 23, 10:58 PM MST, 3 hours 18 minutes before

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In the hours before

Special weather statement, Feb 24, 12:55 AM MST, 1 hour 21 minutes before

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Special weather statement, Feb 24, 2:16 AM MST, 0 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Feb 24, 12:55 AM MST	Special Weather Statement	TFX	Chouteau	65 min
Feb 24, 3:30 AM MST	Winter Weather Advisory	TFX		8 hr
Feb 24, 3:35 AM MST	High Wind Warning	TFX		41 hr
Feb 24, 7:24 AM MST	Special Weather Statement	TFX	Cascade, Chouteau, Lewis and Clark, Liberty, Pondera, Teton	36 min
Feb 24, 8:08 AM MST	Special Weather Statement	TFX	Cascade, Chouteau, Judith Basin, Lewis and Clark, Teton	37 min
Feb 24, 8:48 AM MST	Special Weather Statement	TFX	Cascade, Chouteau, Judith Basin, Lewis and Clark	42 min
Feb 24, 9:30 AM MST	Special Weather Statement	TFX	Cascade, Chouteau, Judith Basin, Lewis and Clark	45 min
Feb 24, 11:52 AM MST	Winter Weather Advisory	TFX		3 days

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.