Alert archive / Montana / Special Weather Statements in 2021

Special Weather Statement, NWS Great Falls, MT

July 3, 2021Beaverhead County, Gallatin County, Madison County, Montana

NWS Great Falls, MT issued this special weather statement at Jul 3, 2021, 5:37 PM MDT for Beaverhead County, Gallatin County, Madison County, Montana. It was in force for 38 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 3, 2021, 5:37 PM MDT (23:37 UTC)
Expired: Jul 3, 2021, 6:15 PM MDT
In force: 38 min
Issued by: NWS Great Falls, MT

Counties Beaverhead County, MT, Gallatin County, MT, Madison County, MT

The radar

The Pocatello radar (KSFX), 198 km from the middle of the area, began a volume at 23:37 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 12:00Z, 11.6 hours before the alert went out and 351 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: 3162 m above ground
0-6 km bulk shear: 12 kt
0-1 km storm-relative helicity: 7 m²/s²
0-3 km storm-relative helicity: 23 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 3, 2:04 PM MDT, 3 hours 33 minutes earlier.

Area forecast discussion, Jul 3, 2:04 PM MDT, 3 hours 33 minutes before

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<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
</head>
<body>
  <main class="wrap">
    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <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.
      </p>
      <p id="message2">
        Please try again in a few minutes.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
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In the hours before

Special weather statement, Jul 3, 5:37 PM MDT, 0 minutes before

Special Weather Statement
National Weather Service Great Falls MT
537 PM MDT Sat Jul 3 2021

MTZ008-015-055-040015-
Madison-Beaverhead-Gallatin-
537 PM MDT Sat Jul 3 2021

...SCATTERED STRONG THUNDERSTORMS WILL AFFECT MADISON...BEAVERHEAD
AND GALLATIN COUNTIES...

At 534 PM MDT, scattered strong thunderstorms will continue to
develop over mainly southern portions of Beaverhead, Madison, and
Gallatin Counties late this afternoon, and move east at 25 mph.

Winds in excess of 30 mph are possible with these storms. Brief rain
showers are also possible.

Locations impacted include...
Dillon, Sheridan, Virginia City, Ennis, Twin Bridges, Lima, Jackson,
Monida, Alder, Dell, Big Sky, Bannack Pass, Targhee Pass, Cameron,
Glen, Snowline, Red Rock Pass, Jeffers, Bannack State Park and
Norris.

This includes the following highways...
 Interstate 15 between mile markers 1  and 88 .
 Highway 191 between mile markers 31 and 75.
 Highway 287 between mile markers 1  and 65.

If outdoors, consider seeking shelter inside a building.

LAT...LON 4445 11300 4477 11313 4487 11346 4506 11345
      4533 11374 4556 11382 4558 11087 4536 11092
      4535 11104 4508 11104 4505 11115 4449 11110
      4449 11111 4475 11139 4470 11149 4454 11148
      4457 11229 4445 11239 4448 11278 4436 11285
TIME...MOT...LOC 2334Z 255DEG 22KT 4520 11313

SC

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 2, 7:24 PM MDT	Special Weather Statement	TFX	Beaverhead	51 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.