Alert archive / Idaho / Special Weather Statements in 2018

Special Weather Statement, NWS Pocatello, ID

May 26, 2018Custer County, Idaho

NWS Pocatello, ID issued this special weather statement at May 26, 2018, 2:02 PM MDT for Custer County, Idaho. It was in force for 43 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: May 26, 2018, 2:02 PM MDT (20:02 UTC)
Expired: May 26, 2018, 2:45 PM MDT
In force: 43 min
Issued by: NWS Pocatello, ID

County Custer County, ID

The radar

The Boise radar (KCBX), 191 km from the middle of the area, began a volume at 20:04 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 183 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: 2 J/kg
Mixed-layer CIN: -294 J/kg
Mixed-layer LCL: 1024 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: -18 m²/s²
0-3 km storm-relative helicity: 8 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 Pocatello, ID wrote its last area forecast discussion before this special weather statement went out at May 26, 3:52 AM MDT, 10 hours 10 minutes earlier.

Area forecast discussion, May 26, 3:52 AM MDT, 10 hours 10 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, May 26, 1:22 PM MDT, 40 minutes before

Special Weather Statement
National Weather Service Pocatello ID
122 PM MDT SAT MAY 26 2018

IDZ018-032-262000-
Lost River/Pashimeroi ID-Sawtooth Mountains ID-
122 PM MDT SAT MAY 26 2018

...NICKEL SIZE HAIL AND HEAVY RAIN POSSIBLE FOR CENTRAL CUSTER
COUNTY INCLUDING CLAYTON UNTIL 200 PM MDT...

At 119 PM MDT, Doppler radar was tracking a strong thunderstorm 12
miles east of Sunbeam or 22 miles east of Stanley, moving north at 10
mph.

Nickel size hail and heavy rainfall will be possible with this storm.

Locations impacted include...
Clayton and Bayhorse Lake.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with this storm, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

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.

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 4410 11443 4418 11463 4450 11462 4434 11415
TIME...MOT...LOC 1919Z 197DEG 8KT 4423 11448

JKEYES

Special weather statement, May 26, 2:02 PM MDT, 0 minutes before

Special Weather Statement
National Weather Service Pocatello ID
202 PM MDT SAT MAY 26 2018

IDZ018-032-262045-
Lost River/Pashimeroi ID-Sawtooth Mountains ID-
202 PM MDT SAT MAY 26 2018

...NICKEL SIZE HAIL AND HEAVY RAIN INCLUDING AREAS JUST WEST OF
CHALLIS UNTIL 245 PM MDT...

At 201 PM MDT, Doppler radar was tracking a strong thunderstorm 10
miles southwest of Challis, moving north at 15 mph.

Nickel size hail will be possible with this storm.

Locations impacted include...
Challis, Bayhorse Lake and Twin Peaks Summit.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with this storm, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

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.

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 4469 11413 4433 11427 4433 11455 4458 11455
      4460 11452 4460 11450 4459 11448 4461 11447
      4461 11445 4465 11444 4465 11441 4467 11440
      4467 11439 4470 11438
TIME...MOT...LOC 2001Z 188DEG 13KT 4442 11440

JKEYES

The office that day

Everything else NWS Pocatello, ID issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 26, 5:30 AM MDT	River Flood Warning	PIH	Custer	3 days
May 26, 5:30 AM MDT	River Flood Warning	PIH	Blaine	4 days
May 26, 1:22 PM MDT	Special Weather Statement	PIH	Custer	38 min
May 26, 2:49 PM MDT	Special Weather Statement	PIH	Cassia	41 min
May 26, 3:27 PM MDT	Severe Thunderstorm Warning	PIH	Cassia, Minidoka	33 min
May 26, 3:58 PM MDT	Severe Thunderstorm Warning	PIH	Cassia, Lincoln, Minidoka	32 min
May 26, 4:29 PM MDT	Severe Thunderstorm Warning	PIH	Lincoln, Minidoka	31 min
May 26, 4:36 PM MDT	Severe Thunderstorm Warning	PIH	Blaine, Cassia, Minidoka	24 min
May 26, 5:10 PM MDT	Special Weather Statement	PIH	Minidoka	35 min
May 26, 5:38 PM MDT	Special Weather Statement	PIH	Blaine	52 min

Nearby

Special Weather Statements in Idaho, 2018 Every special weather statement 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.