Alert archive / Idaho / Special Weather Statements in 2021

Special Weather Statement, NWS Pocatello, ID

July 20, 2021Butte County, Idaho

NWS Pocatello, ID issued this special weather statement at Jul 20, 2021, 1:23 PM MDT for Butte County, Idaho. It was in force for 67 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 20, 2021, 1:23 PM MDT (19:23 UTC)
Expired
Jul 20, 2021, 2:30 PM MDT
In force
67 min
Issued by
NWS Pocatello, ID

County Butte County, ID

The radar

The Pocatello radar (KSFX), 112 km from the middle of the area, began a volume at 19:25 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

Elko, NV (KLKN), launched 12:00Z, 7.4 hours before the alert went out and 329 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-pSkew-T log-p diagram, Elko, NV at 12:00Z on 2021-07-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 6 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Elko, NV at 12:00Z on 2021-07-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -3 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
6 J/kg
Mixed-layer CIN
-227 J/kg
Mixed-layer LCL
1488 m above ground
0-6 km bulk shear
45 kt
0-1 km storm-relative helicity
-3 m²/s²
0-3 km storm-relative helicity
19 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 Jul 20, 3:11 AM MDT, 10 hours 12 minutes earlier.

Area forecast discussion, Jul 20, 3:11 AM MDT, 10 hours 12 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

Local storm report, Jul 20, 9:29 AM MDT, 3 hours 54 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE POCATELLO ID
929 AM MDT TUE JUL 20 2021

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

0843 AM     HEAVY RAIN       5 SE OBSIDIAN           43.95N 114.76W
07/20/2021  M0.47 INCH       CUSTER             ID   MESONET

            MESONET STATION HPFI1 - HORTON PEAK. LAST 24
            HOURS.

&&

KSMITH
Local storm report, Jul 20, 9:30 AM MDT, 3 hours 53 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE POCATELLO ID
930 AM MDT TUE JUL 20 2021

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

0850 AM     HEAVY RAIN       2 WSW CUSTER            44.37N 114.73W
07/20/2021  M0.30 INCH       CUSTER             ID   MESONET

            MESONET STATION YFFI1 - BONANZA. LAST 24
            HOURS.

&&

KSMITH
Special weather statement, Jul 20, 1:23 PM MDT, 0 minutes before
Special Weather Statement
National Weather Service Pocatello ID
123 PM MDT Tue Jul 20 2021

IDZ067>069-073>075-202030-
Lost River Range ID-Beaverhead/Lemhi Highlands ID-
Wood River Foothills ID-Big Lost Highlands/Copper Basin ID-
Sun Valley Region ID-Lost River Valleys ID-
123 PM MDT Tue Jul 20 2021

...SPECIAL WEATHER STATEMENT...

At 122 PM MDT, Doppler radar was tracking a strong thunderstorm near
Darlington, or near Mackay, moving northeast at 10 mph.

Half inch hail and winds in excess of 30 mph will be possible with
this storm.

Locations impacted include...
Mackay, Mackay Reservoir, Darlington, Garfield Ranger Station, Copper
Basin Airport and Clyde.

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.

&&

LAT...LON 4356 11406 4382 11419 4418 11314 4391 11297
TIME...MOT...LOC 1922Z 240DEG 49KT 4388 11349

GK

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 19, 7:32 PM MDTSpecial Weather StatementPIHBear Lake43 min
Jul 20, 2:06 PM MDTSpecial Weather StatementPIHCassia69 min
Jul 20, 2:16 PM MDTSpecial Weather StatementPIHPower44 min
Jul 20, 2:21 PM MDTSpecial Weather StatementPIHButte54 min
Jul 20, 2:51 PM MDTSpecial Weather StatementPIHCaribou24 min
Jul 20, 2:53 PM MDTSevere Thunderstorm WarningPIHCaribou37 min
Jul 20, 3:35 PM MDTSpecial Weather StatementPIHBonneville55 min
Jul 20, 4:09 PM MDTSpecial Weather StatementPIHCaribou36 min
Jul 20, 4:34 PM MDTSpecial Weather StatementPIHBonneville, Teton56 min
Jul 20, 4:39 PM MDTSpecial Weather StatementPIHFremont, Madison51 min
Jul 20, 4:41 PM MDTSpecial Weather StatementPIHCaribou34 min
Jul 20, 5:28 PM MDTSpecial Weather StatementPIHTeton32 min
Jul 20, 5:35 PM MDTSpecial Weather StatementPIHFremont25 min

Nearby

Special Weather Statements in Idaho, 2021Every special weather statement in 2021

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.