Alert archive / Montana / Special Weather Statements in 2021

Special Weather Statement, NWS Great Falls, MT

September 10, 2021Beaverhead County, Montana

NWS Great Falls, MT issued this special weather statement at Sep 10, 2021, 8:49 PM MDT for Beaverhead County, Montana. It was in force for 41 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: Sep 10, 2021, 8:49 PM MDT (02:49 UTC)
Expired: Sep 10, 2021, 9:30 PM MDT
In force: 41 min
Issued by: NWS Great Falls, MT
Hail: 0.00 in
Wind: 30

County Beaverhead County, MT

The radar

The Pocatello radar (KSFX), 215 km from the middle of the area, began a volume at 02:53 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

Boise Airport, ID (KBOI), launched 00:00Z, 2.8 hours before the alert went out and 318 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: 1590 m above ground
0-6 km bulk shear: 50 kt
0-1 km storm-relative helicity: -23 m²/s²
0-3 km storm-relative helicity: 2 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 Sep 10, 3:02 PM MDT, 5 hours 47 minutes earlier.

Area forecast discussion, Sep 10, 3:02 PM MDT, 5 hours 47 minutes before

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In the hours before

Special weather statement, Sep 10, 4:47 PM MDT, 4 hours 2 minutes before

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Special weather statement, Sep 10, 5:46 PM MDT, 3 hours 3 minutes before

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      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
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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
Sep 10, 6:12 PM MDT	Severe Thunderstorm Warning Considerable damage threat	TFX	Beaverhead, Gallatin, Madison	48 min
Sep 10, 7:02 PM MDT	Special Weather Statement	TFX	Gallatin, Jefferson, Madison	28 min
Sep 10, 7:32 PM MDT	Special Weather Statement	TFX	Broadwater, Jefferson, Meagher	43 min
Sep 10, 8:04 PM MDT	Special Weather Statement	TFX	Beaverhead	41 min
Sep 10, 8:24 PM MDT	Special Weather Statement	TFX	Broadwater, Jefferson, Lewis and Clark, Meagher	36 min
Sep 10, 8:58 PM MDT	Special Weather Statement	TFX	Broadwater, Lewis and Clark, Meagher	32 min
Sep 11, 3:34 PM MDT	Special Weather Statement	TFX	Hill	41 min
Sep 11, 5:26 PM MDT	Special Weather Statement	TFX	Blaine	64 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.