Alert archive / Montana / Special Weather Statements in 2022

Special Weather Statement, NWS Missoula, MT

July 13, 2022Silver Bow County, Montana

NWS Missoula, MT issued this special weather statement at Jul 13, 2022, 2:02 PM MDT for Silver Bow County, Montana. It was in force for 28 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 13, 2022, 2:02 PM MDT (20:02 UTC)
Expired: Jul 13, 2022, 2:30 PM MDT
In force: 28 min
Issued by: NWS Missoula, MT
Hail: 0.00 in
Wind: 40

County Silver Bow County, MT

The radar

The Missoula radar (KMSX), 181 km from the middle of the area, began a volume at 20:06 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, 8.0 hours before the alert went out and 386 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: 3969 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 133 m²/s²
0-3 km storm-relative helicity: 159 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 Missoula, MT wrote its last area forecast discussion before this special weather statement went out at Jul 13, 4:19 AM MDT, 9 hours 43 minutes earlier.

Area forecast discussion, Jul 13, 4:19 AM MDT, 9 hours 43 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, Jul 13, 2:02 PM MDT, 0 minutes before

Special Weather Statement
National Weather Service Missoula MT
202 PM MDT Wed Jul 13 2022

MTZ007-132030-
Butte/Blackfoot Region MT-
202 PM MDT Wed Jul 13 2022

...A strong thunderstorm will impact portions of southeastern Silver
Bow County through 230 PM MDT...

At 202 PM MDT, Doppler radar was tracking a strong thunderstorm 10
miles east of Divide, or 14 miles south of Butte, moving northeast at
25 mph.

HAZARD...Winds in excess of 40 mph.

SOURCE...Radar indicated.

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

Locations impacted include...
Butte, Janney and Newcomb.

This includes Interstate 90 between mile markers 227 and 231.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

&&

LAT...LON 4574 11235 4574 11246 4576 11249 4576 11250
      4574 11252 4571 11252 4569 11255 4577 11269
      4602 11244 4593 11244 4589 11240 4585 11243
      4579 11228
TIME...MOT...LOC 2002Z 221DEG 23KT 4577 11253

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...40 MPH

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 12, 8:34 PM MDT	Special Weather Statement	MSO		41 min
Jul 13, 2:10 PM MDT	Special Weather Statement	MSO	Deer Lodge	35 min
Jul 13, 4:51 PM MDT	Special Weather Statement	MSO	Silver Bow	24 min
Jul 13, 5:04 PM MDT	Special Weather Statement	MSO	Deer Lodge	41 min
Jul 13, 2:49 PM MDT	Special Weather Statement	MSO	Lemhi	41 min
Jul 13, 3:24 PM MDT	Special Weather Statement	MSO	Lemhi	21 min
Jul 13, 3:30 PM MDT	Severe Thunderstorm Warning	MSO	Lemhi	15 min

Nearby

Special Weather Statements in Montana, 2022 Every special weather statement in 2022

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.