Alert archive / Montana / Special Weather Statements in 2021

Special Weather Statement, NWS Great Falls, MT

July 20, 2021Chouteau County, Judith Basin County, Montana

NWS Great Falls, MT issued this special weather statement at Jul 20, 2021, 8:45 PM MDT for Chouteau County, Judith Basin County, Montana. It was in force for 30 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 20, 2021, 8:45 PM MDT (02:45 UTC)
Expired: Jul 20, 2021, 9:15 PM MDT
In force: 30 min
Issued by: NWS Great Falls, MT

Counties Chouteau County, MT, Judith Basin County, MT

The radar

The Great Falls radar (KTFX), 69 km from the middle of the area, began a volume at 02:48 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, 2.8 hours before the alert went out and 19 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: 483 J/kg
Mixed-layer CIN: -31 J/kg
Mixed-layer LCL: 2558 m above ground
0-6 km bulk shear: 14 kt
0-1 km storm-relative helicity: -3 m²/s²
0-3 km storm-relative helicity: 13 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 Jul 20, 8:39 PM MDT, 6 minutes earlier.

Area forecast discussion, Jul 20, 8:39 PM MDT, 6 minutes before

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In the hours before

Local storm report, Jul 20, 7:07 PM MDT, 1 hour 38 minutes before

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Special weather statement, Jul 20, 7:17 PM MDT, 1 hour 28 minutes before

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Local storm report, Jul 20, 7:32 PM MDT, 1 hour 13 minutes before

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Special weather statement, Jul 20, 7:47 PM MDT, 58 minutes before

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Special weather statement, Jul 20, 7:52 PM MDT, 53 minutes before

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Special weather statement, Jul 20, 8:45 PM MDT, 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
Jul 20, 6:10 PM MDT	Special Weather Statement	TFX	Teton	35 min
Jul 20, 6:14 PM MDT	Special Weather Statement	TFX	Toole	31 min
Jul 20, 6:18 PM MDT	Special Weather Statement	TFX	Cascade	27 min
Jul 20, 6:34 PM MDT	Special Weather Statement	TFX	Teton	26 min
Jul 20, 6:48 PM MDT	Severe Thunderstorm Warning	TFX	Pondera, Teton	27 min
Jul 20, 7:01 PM MDT	Special Weather Statement	TFX	Cascade	29 min
Jul 20, 7:17 PM MDT	Special Weather Statement	TFX	Teton	28 min
Jul 20, 7:47 PM MDT	Special Weather Statement	TFX		28 min
Jul 20, 7:52 PM MDT	Special Weather Statement	TFX	Cascade	23 min
Jul 21, 1:26 PM MDT	Fire Weather Watch	TFX	Broadwater, Cascade, Chouteau, Fergus, Gallatin, Jefferson and 4 more	25 hr
Jul 21, 1:26 PM MDT	Red Flag Warning	TFX	Blaine, Broadwater, Cascade, Chouteau, Fergus, Gallatin and 12 more	56 hr
Jul 21, 2:38 PM MDT	Special Weather Statement	TFX	Glacier	37 min
Jul 21, 2:48 PM MDT	Special Weather Statement	TFX	Pondera	27 min
Jul 21, 2:56 PM MDT	Severe Thunderstorm Warning	TFX	Glacier	34 min
Jul 21, 3:16 PM MDT	Severe Thunderstorm Warning	TFX	Glacier	29 min
Jul 21, 3:23 PM MDT	Special Weather Statement	TFX	Pondera	37 min
Jul 21, 3:49 PM MDT	Special Weather Statement	TFX	Pondera	26 min
Jul 21, 3:50 PM MDT	Severe Thunderstorm Warning	TFX	Pondera	40 min
Jul 21, 3:51 PM MDT	Special Weather Statement	TFX	Teton	24 min
Jul 21, 4:07 PM MDT	Special Weather Statement	TFX	Fergus	23 min
Jul 21, 4:07 PM MDT	Severe Thunderstorm Warning	TFX	Pondera, Teton	38 min
Jul 21, 4:24 PM MDT	Special Weather Statement	TFX	Jefferson	36 min
Jul 21, 4:29 PM MDT	Special Weather Statement	TFX	Madison	31 min
Jul 21, 4:34 PM MDT	Special Weather Statement	TFX	Silver Bow	26 min
Jul 21, 4:39 PM MDT	Special Weather Statement	TFX	Fergus	36 min
Jul 21, 4:42 PM MDT	Special Weather Statement	TFX	Lewis and Clark	33 min
Jul 21, 4:45 PM MDT	Severe Thunderstorm Warning	TFX	Liberty, Pondera, Teton, Toole	45 min
Jul 21, 4:53 PM MDT	Special Weather Statement	TFX	Teton	22 min
Jul 21, 4:54 PM MDT	Special Weather Statement	TFX	Lewis and Clark	36 min
Jul 21, 4:56 PM MDT	Special Weather Statement	TFX	Jefferson	34 min
Jul 21, 4:58 PM MDT	Special Weather Statement	TFX	Broadwater, Jefferson	32 min
Jul 21, 5:02 PM MDT	Special Weather Statement	TFX	Glacier	28 min
Jul 21, 5:04 PM MDT	Special Weather Statement	TFX	Deer Lodge	26 min
Jul 21, 5:21 PM MDT	Special Weather Statement	TFX	Lewis and Clark	24 min
Jul 21, 5:29 PM MDT	Severe Thunderstorm Warning	TFX	Liberty, Toole	46 min
Jul 21, 5:32 PM MDT	Special Weather Statement	TFX	Cascade	43 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.