Alert archive / Montana / Special Weather Statements in 2021

Special Weather Statement, NWS Great Falls, MT

September 9, 2021Gallatin County, Madison County, Montana

NWS Great Falls, MT issued this special weather statement at Sep 9, 2021, 5:46 PM MDT for Gallatin County, Madison County, Montana. It was in force for 29 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 9, 2021, 5:46 PM MDT (23:46 UTC)
Expired
Sep 9, 2021, 6:15 PM MDT
In force
29 min
Issued by
NWS Great Falls, MT
Hail
0.00 in
Wind
50

Counties Gallatin County, MT, Madison County, MT

The radar

The Great Falls radar (KTFX), 214 km from the middle of the area, began a volume at 23:46 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 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 9, 2:36 PM MDT, 3 hours 10 minutes earlier.

Area forecast discussion, Sep 9, 2:36 PM MDT, 3 hours 10 minutes before
<!doctype html>
<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, Sep 9, 4:35 PM MDT, 1 hour 11 minutes before
Special Weather Statement
National Weather Service Great Falls MT
435 PM MDT Thu Sep 9 2021

MTZ008-015-055-100045-
Beaverhead-Madison-Gallatin-
Including the cities of Big Hole Pass, Wisdom, Dillon,
Chief Joseph Pass, Monida Pass, Wise River, Ennis, Norris Hill,
Raynolds Pass, Twin Bridges, Virginia City, Bozeman Apt,
City of Bozeman, West Yellowstone, Battle Ridge Pass,
Bozeman Pass, and Targhee Pass
435 PM MDT Thu Sep 9 2021

...Isolated showers and thunderstorms may cause strong wind gusts
across a portion of Southwest Montana through early this
evening...

As of 430 pm MDT...Isolated showers have developed over
Beaverhead and Madison Counties, and will likely move into much
of Gallatin County through 530 pm. A few embedded thunderstorms
with isolated lightning strikes are also possible.

However, the main threat from these collapsing showers and storms
will be potentially strong wind gusts of up to 50 mph.

If you see a shower overhead, or if you hear a clap of thunder,
make sure you seek shelter!
Local storm report, Sep 9, 5:38 PM MDT, 8 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GREAT FALLS MT
538 PM MDT THU SEP 9 2021

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0523 PM     TSTM WND GST     5 ENE DILLON            45.25N 112.55W
09/09/2021  M46 MPH          BEAVERHEAD         MT   ASOS

            ASOS STATION KDLN DILLON AIRPORT.

&&

SAC
Local storm report, Sep 9, 5:44 PM MDT, 2 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GREAT FALLS MT
544 PM MDT THU SEP 9 2021

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0535 PM     TSTM WND GST     5 NNE CAMERON           45.27N 111.65W
09/09/2021  M51 MPH          MADISON            MT   AWOS

            AWOS STATION KEKS ENNIS BIG SKY AWOS.

&&

SAC
Special weather statement, Sep 9, 5:46 PM MDT, 0 minutes before
Special Weather Statement
National Weather Service Great Falls MT
546 PM MDT Thu Sep 9 2021

MTZ008-015-052-055-100015-
Madison MT-Beaverhead MT-Jefferson MT-Gallatin MT-
546 PM MDT Thu Sep 9 2021

...Strong thunderstorms will impact portions of northern Madison,
central Beaverhead, southern Jefferson and central Gallatin Counties
through 615 PM MDT...

At 546 PM MDT, Doppler radar was tracking strong thunderstorms along
a line extending from 10 miles north of Dillon to 14 miles east of
Ennis. Movement was northeast at 50 mph.

HAZARD...Wind gusts up to 50 mph.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects.

Locations impacted include...
Bozeman, Sheridan, Virginia City, Ennis, Twin Bridges, Alder, Pony,
Silver Star, Harrison, Norris, Big Sky, Mcallister, Bozeman Hot
Springs, Gallatin Gateway, Laurin, Waterloo, Glen and Jeffers.

This includes the following highways...
 Interstate 15 between mile markers 67  and 92 .
 Interstate 90 between mile markers 314 and 317.
 Highway 191 between mile markers 47 and 81.
 Highway 287 between mile markers 40 and 76.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 4564 11265 4570 11253 4576 11250 4564 11079
      4560 11080 4559 11086 4553 11086 4552 11092
      4543 11092 4521 11131 4528 11296
TIME...MOT...LOC 2346Z 238DEG 43KT 4537 11265 4535 11144

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...50 MPH

ML

Nearby

Special Weather Statements in Montana, 2021Every 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; radar from the NEXRAD Level II archive.