Alert archive / Montana / Special Weather Statements in 2021

Special Weather Statement, NWS Great Falls, MT

July 16, 2021

NWS Great Falls, MT issued this special weather statement at Jul 16, 2021, 12:10 AM MDT. It was in force for 50 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 16, 2021, 12:10 AM MDT (06:10 UTC)
Expired: Jul 16, 2021, 1:00 AM MDT
In force: 50 min
Issued by: NWS Great Falls, MT

The radar

The Missoula radar (KMSX), 152 km from the middle of the area, began a volume at 06:11 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, 6.2 hours before the alert went out and 305 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 Great Falls, MT wrote its last area forecast discussion before this special weather statement went out at Jul 15, 11:45 PM MDT, 25 minutes earlier.

Area forecast discussion, Jul 15, 11:45 PM MDT, 25 minutes before

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In the hours before

Special weather statement, Jul 15, 8:35 PM MDT, 3 hours 35 minutes before

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Special weather statement, Jul 15, 9:41 PM MDT, 2 hours 29 minutes before

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Special weather statement, Jul 15, 10:25 PM MDT, 1 hour 45 minutes before

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Special weather statement, Jul 16, 12:10 AM MDT, 0 minutes before

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        Please try again in a few minutes.
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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 15, 6:04 PM MDT	Special Weather Statement	TFX	Broadwater	56 min
Jul 15, 8:35 PM MDT	Special Weather Statement	TFX	Meagher	55 min
Jul 15, 9:41 PM MDT	Special Weather Statement	TFX	Judith Basin	49 min
Jul 16, 2:14 PM MDT	Excessive Heat Warning	TFX		3 days
Jul 16, 2:14 PM MDT	Heat 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.