Alert archive / Montana / Special Weather Statements in 2022

Special Weather Statement, NWS Missoula, MT

July 4, 2022Powell County, Montana

NWS Missoula, MT issued this special weather statement at Jul 4, 2022, 2:12 PM MDT for Powell County, Montana. It was in force for 33 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 4, 2022, 2:12 PM MDT (20:12 UTC)
Expired: Jul 4, 2022, 2:45 PM MDT
In force: 33 min
Issued by: NWS Missoula, MT
Hail: 0.50 in
Wind: 40

County Powell County, MT

The radar

The Missoula radar (KMSX), 56 km from the middle of the area, began a volume at 20:15 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, 8.2 hours before the alert went out and 213 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: 751 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 24 m²/s²
0-3 km storm-relative helicity: 15 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 4, 2:41 AM MDT, 11 hours 31 minutes earlier.

Area forecast discussion, Jul 4, 2:41 AM MDT, 11 hours 31 minutes before

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</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.
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In the hours before

Local storm report, Jul 4, 11:00 AM MDT, 3 hours 12 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MISSOULA MT
1100 AM MDT MON JUL 4 2022

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

0310 PM     HAIL             CONNER                  45.93N 114.13W
07/03/2022  E1.00 INCH       RAVALLI            MT   PUBLIC

            REPORT RECEIVED VIA FACEBOOK MENTIONING
            QUARTER SIZE HAIL THAT RUINED THEIR GARDEN.

&&

JK

Special weather statement, Jul 4, 2:12 PM MDT, 0 minutes before

Special Weather Statement
National Weather Service Missoula MT
212 PM MDT Mon Jul 4 2022

MTZ007-043-042045-
Butte/Blackfoot Region MT-Potomac/Seeley Lake Region MT-
212 PM MDT Mon Jul 4 2022

...A strong thunderstorm will impact portions of east central
Missoula, northern Granite and west central Powell Counties through
245 PM MDT...

At 211 PM MDT, Doppler radar was tracking a strong thunderstorm 14
miles southwest of Ovando, or 15 miles northwest of Drummond, moving
northeast at 25 mph.

HAZARD...Winds in excess of 40 mph and half-inch size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor damage to outdoor objects is
         possible.

Locations impacted include...
Ovando and Garnet.

This includes Highway 200 between mile markers 36 and 39.

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 4680 11334 4686 11346 4706 11328 4693 11302
TIME...MOT...LOC 2011Z 228DEG 21KT 4685 11334

MAX HAIL SIZE...0.50 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 3, 6:17 PM MDT	Special Weather Statement	MSO	Lake	43 min
Jul 4, 3:12 PM MDT	Special Weather Statement	MSO	Lake	33 min
Jul 4, 3:23 PM MDT	Special Weather Statement	MSO	Jefferson	37 min
Jul 4, 3:34 PM MDT	Special Weather Statement	MSO	Granite	26 min
Jul 4, 3:39 PM MDT	Areal Flood Advisory	MSO	Powell	111 min
Jul 4, 3:59 PM MDT	Special Weather Statement	MSO	Granite	31 min
Jul 4, 4:06 PM MDT	Severe Thunderstorm Warning	MSO	Granite, Missoula, Powell	24 min
Jul 4, 4:25 PM MDT	Areal Flood Advisory	MSO	Granite	2 hr
Jul 4, 4:26 PM MDT	Special Weather Statement	MSO	Lincoln	64 min
Jul 4, 4:29 PM MDT	Severe Thunderstorm Warning	MSO	Granite, Missoula, Powell	31 min
Jul 4, 4:36 PM MDT	Special Weather Statement	MSO	Deer Lodge	39 min
Jul 4, 5:48 PM MDT	Special Weather Statement	MSO	Powell	27 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.