Alert archive / Montana / Special Weather Statements in 2021

Special Weather Statement, NWS Great Falls, MT

August 16, 2021Meagher County, Montana

NWS Great Falls, MT issued this special weather statement at Aug 16, 2021, 2:53 PM MDT for Meagher County, Montana. It was in force for 22 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: Aug 16, 2021, 2:53 PM MDT (20:53 UTC)
Expired: Aug 16, 2021, 3:15 PM MDT
In force: 22 min
Issued by: NWS Great Falls, MT
Hail: 0.00 in
Wind: 30

County Meagher County, MT

The radar

The Great Falls radar (KTFX), 117 km from the middle of the area, began a volume at 20:56 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 12:00Z, 8.9 hours before the alert went out and 120 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: 3460 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 170 m²/s²
0-3 km storm-relative helicity: 190 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 Aug 16, 11:29 AM MDT, 3 hours 24 minutes earlier.

Area forecast discussion, Aug 16, 11:29 AM MDT, 3 hours 24 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>
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        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, Aug 16, 2:53 PM MDT, 0 minutes before

Special Weather Statement
National Weather Service Great Falls MT
253 PM MDT Mon Aug 16 2021

MTZ053-054-162115-
Broadwater MT-Meagher MT-
253 PM MDT Mon Aug 16 2021

...A thunderstorm will impact portions of east central Broadwater
and south central Meagher Counties through 315 PM MDT...

At 252 PM MDT, Doppler radar was tracking a thunderstorm 15 miles
northeast of Townsend, moving east at 35 mph.

HAZARD...Winds in excess of 30 mph. A few lightning strikes are also
         possible.

SOURCE...Radar indicated.

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

Locations impacted include...
The southern portion of the Woods Creek Fire...White Sulphur Springs.

This includes the following highways...
 Highway 12 between mile markers 11 and 49.
 Highway 89 between mile markers 1 and 5, and between mile markers 54
and 57.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 4631 11129 4648 11138 4665 11081 4640 11069
TIME...MOT...LOC 2052Z 251DEG 31KT 4642 11123

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...30 MPH

SC

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 16, 3:00 PM MDT	Special Weather Statement	TFX	Madison	30 min
Aug 16, 3:02 PM MDT	Special Weather Statement	TFX	Fergus	28 min
Aug 16, 3:39 PM MDT	Special Weather Statement	TFX	Madison	36 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.