Alert archive / Montana / Special Weather Statements in 2017

Special Weather Statement, NWS Missoula, MT

June 1, 2017Ravalli County, Montana

NWS Missoula, MT issued this special weather statement at Jun 1, 2017, 1:40 PM MDT for Ravalli County, Montana. It was in force for 35 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: Jun 1, 2017, 1:40 PM MDT (19:40 UTC)
Expired: Jun 1, 2017, 2:15 PM MDT
In force: 35 min
Issued by: NWS Missoula, MT

County Ravalli County, MT

The radar

The Missoula radar (KMSX), 141 km from the middle of the area, began a volume at 19:40 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, 7.7 hours before the alert went out and 319 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: 21 J/kg
Mixed-layer CIN: -406 J/kg
Mixed-layer LCL: 2141 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 8 m²/s²
0-3 km storm-relative helicity: 128 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 Jun 1, 4:20 AM MDT, 9 hours 20 minutes earlier.

Area forecast discussion, Jun 1, 4:20 AM MDT, 9 hours 20 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>
      <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, Jun 1, 12:51 PM MDT, 49 minutes before

Special Weather Statement
National Weather Service Missoula MT
1251 PM MDT THU JUN 1 2017

IDZ009-010-011930-
Eastern Lemhi County ID-Western Lemhi County ID-
1251 PM MDT THU JUN 1 2017

...SIGNIFICANT WEATHER ADVISORY FOR NORTH CENTRAL LEMHI AND SOUTHERN
RAVALLI COUNTIES UNTIL 130 PM MDT...

At 1249 PM MDT, Doppler radar was tracking a strong thunderstorm near
North Fork, or 12 miles northwest of Salmon, moving north at 40 mph.

Heavy rain, lightning, pea size hail and winds in excess of 30 mph
will be possible with this storm affecting US-93.

Locations impacted include...
Salmon, North Fork, Gibbonsville, Carmen, Leesburg and Shoup.

LAT...LON 4524 11430 4554 11425 4554 11420 4556 11414
      4562 11407 4565 11402 4569 11402 4571 11399
      4569 11394 4562 11390 4560 11381 4552 11384
      4552 11377 4541 11377 4539 11373 4533 11374
      4530 11370 4516 11376
TIME...MOT...LOC 1849Z 188DEG 36KT 4534 11401

Special weather statement, Jun 1, 1:12 PM MDT, 28 minutes before

Special Weather Statement
National Weather Service Missoula MT
112 PM MDT THU JUN 1 2017

IDZ010-MTZ005-006-011945-
Eastern Lemhi County ID-Bitterroot/Sapphire Mountains MT-
Missoula/Bitterroot Valleys MT-
112 PM MDT THU JUN 1 2017

...SIGNIFICANT WEATHER ADVISORY FOR NORTHERN LEMHI...EASTERN IDAHO
AND SOUTHWESTERN RAVALLI COUNTIES UNTIL 145 PM MDT...

At 110 PM MDT, Doppler radar was tracking a strong thunderstorm 24
miles west of Gibbonsville, or 1 mile west of Alta Campground,
moving northeast at 35 mph.

Lightning, heavy rain, pea size hail and winds in excess of 30 mph
will be possible with this storm.

Locations impacted include...
Sula, Alta Campground, Painted Rocks State Park, Slate Creek and
Rombo Campgrounds.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4578 11386 4577 11389 4574 11392 4551 11436
      4565 11454 4567 11450 4569 11451 4571 11450
      4573 11451 4586 11444 4585 11441 4588 11439
      4591 11441 4593 11440 4582 11377
TIME...MOT...LOC 1910Z 225DEG 30KT 4562 11442

Special weather statement, Jun 1, 1:40 PM MDT, 0 minutes before

Special Weather Statement
National Weather Service Missoula MT
140 PM MDT THU JUN 1 2017

IDZ006-MTZ005>007-012015-
Southern Clearwater Mountains ID-Bitterroot/Sapphire Mountains MT-
Missoula/Bitterroot Valleys MT-Butte/Blackfoot Region MT-
140 PM MDT THU JUN 1 2017

...SIGNIFICANT WEATHER ADVISORY FOR NORTHERN LEMHI...EAST CENTRAL
IDAHO...SOUTHWESTERN DEER LODGE...SOUTH CENTRAL GRANITE AND SOUTHERN
RAVALLI COUNTIES UNTIL 215 PM MDT...

At 139 PM MDT, Doppler radar was tracking a strong thunderstorm 9
miles south of Conner, or 31 miles south of Hamilton, moving
northeast at 35 mph.

Widespread pea size to half inch hail and wind gusts of 50 to 55 mph
will be possible with this storm.

Locations impacted include...
Darby, Conner, Sula, and Como. Campgrounds Crazy Creek, Warm
Springs, and Spring Gulch.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

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

&&

LAT...LON 4575 11385 4578 11387 4575 11391 4571 11391
      4569 11396 4571 11399 4569 11402 4565 11402
      4562 11407 4585 11442 4612 11426 4594 11351
TIME...MOT...LOC 1939Z 220DEG 30KT 4580 11415

The office that day

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

Issued	Product	Office	Counties	Lasted
May 31, 7:03 PM MDT	Special Weather Statement	MSO	Missoula	27 min
May 31, 7:30 PM MDT	Special Weather Statement	MSO	Lake	45 min
May 31, 8:12 PM MDT	Special Weather Statement	MSO	Lake	33 min
May 31, 8:53 PM MDT	Special Weather Statement	MSO	Flathead	37 min
May 31, 9:22 PM MDT	Special Weather Statement	MSO	Flathead	38 min
Jun 1, 9:57 AM MDT	Areal Flood Advisory	MSO	Ravalli	10 hr
Jun 1, 12:51 PM MDT	Special Weather Statement	MSO		39 min
Jun 1, 1:12 PM MDT	Special Weather Statement	MSO	Ravalli	33 min
Jun 1, 2:06 PM MDT	Special Weather Statement	MSO	Granite	24 min
Jun 1, 2:11 PM MDT	Special Weather Statement	MSO	Ravalli	34 min
Jun 1, 2:34 PM MDT	Special Weather Statement	MSO	Granite	26 min
Jun 1, 3:08 PM MDT	Special Weather Statement	MSO	Powell	52 min
Jun 1, 3:59 PM MDT	Special Weather Statement	MSO	Powell	46 min
May 31, 9:15 PM MDT	Areal Flood Advisory	MSO	Idaho	3 hr
Jun 1, 1:34 PM MDT	Areal Flood Advisory	MSO	Lemhi	3 hr

Nearby

Special Weather Statements in Montana, 2017 Every special weather statement in 2017

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.