Alert archive / Montana / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 44, NWS Great Falls, MT

July 25, 20184 counties in Montana

NWS Great Falls, MT issued this severe thunderstorm warning at Jul 25, 2018, 7:46 PM MDT for 4 counties in Montana. It was in force for 59 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Jul 25, 2018, 7:46 PM MDT (01:46 UTC)
Expired: Jul 25, 2018, 8:45 PM MDT
In force: 59 min
Issued by: NWS Great Falls, MT
Area: Storm-based polygon
Hail: 1.25 in
Wind: 60.0 mph

Counties Glacier County, MT, Pondera County, MT, Teton County, MT, Toole County, MT

The radar

The Great Falls radar (KTFX), 120 km from the middle of the area, began a volume at 01:49 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 00:00Z, 1.8 hours before the alert went out and 161 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: 212 J/kg
Mixed-layer CIN: -87 J/kg
Mixed-layer LCL: 1981 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 31 m²/s²
0-3 km storm-relative helicity: 144 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm warning 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 severe thunderstorm warning went out at Jul 25, 6:05 PM MDT, 1 hour 41 minutes earlier.

Area forecast discussion, Jul 25, 6:05 PM MDT, 1 hour 41 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.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>

In the hours before

Special weather statement, Jul 25, 6:55 PM MDT, 51 minutes before

Special Weather Statement
National Weather Service Great Falls MT
655 PM MDT WED JUL 25 2018

MTZ009-260145-
Northern Rocky Mountain Front MT-
655 PM MDT WED JUL 25 2018

...SIGNIFICANT WEATHER ADVISORY FOR WEST CENTRAL PONDERA AND SOUTH
CENTRAL GLACIER COUNTIES UNTIL 745 PM MDT...

At 654 PM MDT, Doppler radar was tracking a strong thunderstorm near
Kiowa, or 46 miles west of Cut Bank, moving southeast at 20 mph.

Dime size hail and wind gusts up to 50 mph will be possible with this
storm.

Locations impacted include...
Kiowa, East Glacier Park Village, East Glacier Park and South
Browning.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Persons in campgrounds should consider seeking sturdy shelter until
this storm passes.

&&

LAT...LON 4858 11329 4851 11282 4848 11279 4820 11319
      4835 11337 4837 11334 4842 11335 4842 11340
      4845 11347
TIME...MOT...LOC 0054Z 313DEG 17KT 4847 11331

mpj

Special weather statement, Jul 25, 7:02 PM MDT, 44 minutes before

Special Weather Statement
National Weather Service Great Falls MT
702 PM MDT WED JUL 25 2018

MTZ010-044-046-260145-
Eastern Glacier MT-Eastern Pondera MT-Toole MT-
702 PM MDT WED JUL 25 2018

...SIGNIFICANT WEATHER ADVISORY FOR NORTH CENTRAL PONDERA...EAST
CENTRAL GLACIER AND SOUTHWESTERN TOOLE COUNTIES UNTIL 745 PM MDT...

At 701 PM MDT, Doppler radar was tracking a strong thunderstorm 9
miles west of Cut Bank, moving southeast at 15 mph.

Dime size hail and wind gusts up to 50 mph will be possible with this
storm.

Locations impacted include...
Cut Bank and Ethridge.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
office in Great Falls.

&&

LAT...LON 4859 11270 4873 11254 4856 11207 4834 11230
TIME...MOT...LOC 0101Z 304DEG 15KT 4863 11253

mpj

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 25, 6:55 PM MDT	Special Weather Statement	TFX	Glacier	50 min
Jul 25, 7:02 PM MDT	Special Weather Statement	TFX	Pondera	43 min
Jul 25, 8:44 PM MDT	Severe Thunderstorm Warning	TFX	Teton	61 min
Jul 25, 9:45 PM MDT	Severe Thunderstorm Warning	TFX	Cascade, Teton	60 min
Jul 25, 9:50 PM MDT	Special Weather Statement	TFX	Teton	40 min
Jul 25, 10:44 PM MDT	Special Weather Statement	TFX	Cascade	46 min
Jul 25, 11:24 PM MDT	Special Weather Statement	TFX	Judith Basin	36 min
Jul 25, 11:29 PM MDT	Special Weather Statement	TFX	Judith Basin	31 min
Jul 25, 11:57 PM MDT	Special Weather Statement	TFX	Judith Basin	33 min
Jul 25, 11:59 PM MDT	Special Weather Statement	TFX	Pondera	31 min
Jul 26, 12:02 AM MDT	Special Weather Statement	TFX	Judith Basin	28 min
Jul 26, 12:45 AM MDT	Special Weather Statement	TFX	Wheatland	15 min
Jul 26, 12:48 AM MDT	Special Weather Statement	TFX	Judith Basin	27 min
Jul 26, 1:23 AM MDT	Special Weather Statement	TFX	Fergus	37 min
Jul 26, 1:26 AM MDT	Special Weather Statement	TFX	Toole	34 min
Jul 26, 11:43 AM MDT	Special Weather Statement	TFX	Fergus	32 min
Jul 26, 3:00 PM MDT	Special Weather Statement	TFX	Glacier	60 min
Jul 26, 3:21 PM MDT	Severe Thunderstorm Warning	TFX	Glacier	54 min
Jul 26, 4:34 PM MDT	Severe Thunderstorm Warning	TFX	Cascade, Lewis and Clark	22 min

Nearby

Severe Thunderstorm Warnings in Montana, 2018 Every severe thunderstorm warning in 2018

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.