Alert archive / Oregon / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 4, NWS Boise, ID

April 29, 2020Baker County, Oregon

NWS Boise, ID issued this severe thunderstorm warning at Apr 29, 2020, 6:29 PM PDT for Baker County, Oregon. It was in force for 61 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: Apr 29, 2020, 6:29 PM PDT (01:29 UTC)
Expired: Apr 29, 2020, 7:30 PM PDT
In force: 61 min
Issued by: NWS Boise, ID
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Baker County, OR

The radar

The Pendleton radar (KPDT), 143 km from the middle of the area, began a volume at 01:31 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 00:00Z, 1.5 hours before the alert went out and 173 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: 20 J/kg
Mixed-layer CIN: -72 J/kg
Mixed-layer LCL: 3346 m above ground
0-6 km bulk shear: 56 kt
0-1 km storm-relative helicity: 44 m²/s²
0-3 km storm-relative helicity: 102 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 Boise, ID wrote its last area forecast discussion before this severe thunderstorm warning went out at Apr 29, 1:44 PM PDT, 4 hours 45 minutes earlier.

Area forecast discussion, Apr 29, 1:44 PM PDT, 4 hours 45 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, Apr 29, 4:35 PM PDT, 1 hour 54 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>

Special weather statement, Apr 29, 4:49 PM PDT, 1 hour 40 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>

Special weather statement, Apr 29, 5:08 PM PDT, 1 hour 21 minutes before

Special Weather Statement
National Weather Service Boise ID
608 PM MDT Wed Apr 29 2020

IDZ016-300100-
Western Magic Valley ID-
608 PM MDT Wed Apr 29 2020

...SIGNIFICANT WEATHER ADVISORY FOR NORTHERN JEROME...WEST CENTRAL
TWIN FALLS AND SOUTHEASTERN GOODING COUNTIES UNTIL 700 PM MDT...

At 607 PM MDT, Doppler radar was tracking a strong thunderstorm 7
miles west of Jerome, moving northeast at 35 mph.

Half inch hail and wind gusts up to 50 mph will be possible with this
storm.

This strong thunderstorm will be near...
  Twin Falls around 610 PM MDT.
  Jerome around 620 PM MDT.
  Minidoka National Monument around 630 PM MDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

When safe to do so, please relay storm reports to the National
Weather Service in Boise via local law enforcement, or National
Weather Service Boise Facebook and Twitter accounts.

&&

LAT...LON 4251 11472 4266 11487 4286 11460 4284 11437
      4281 11435 4281 11415 4280 11405 4276 11404
TIME...MOT...LOC 0007Z 226DEG 28KT 4268 11464

SP

Special weather statement, Apr 29, 5:08 PM PDT, 1 hour 21 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>

Special weather statement, Apr 29, 5:50 PM PDT, 39 minutes before

Special Weather Statement
National Weather Service Boise ID
650 PM MDT Wed Apr 29 2020

ORZ061-063-300145-
Malheur County OR-Harney County OR-
650 PM MDT Wed Apr 29 2020

...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN HARNEY AND
NORTHWESTERN MALHEUR COUNTIES UNTIL 745 PM MDT/645 PM PDT/...

At 650 PM MDT/550 PM PDT/, Doppler radar was tracking a strong
thunderstorm near Otis Mountain, or 38 miles northeast of Burns,
moving northeast at 40 mph.

Half inch hail and wind gusts up to 50 mph will be possible with this
storm.

This strong thunderstorm will be near...
  Cottonwood Creek Reservoir around 600 PM PDT.
  Castle Rock, Beulah Reservoir and Beulah around 610 PM PDT.
  Sheep Rock around 720 PM MDT.
  Ironside Mountain around 730 PM MDT.
  Brushy Hollow around 740 PM MDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

When safe to do so, please relay storm reports to the National
Weather Service in Boise via local law enforcement, or National
Weather Service Boise Facebook and Twitter accounts.

&&

LAT...LON 4405 11862 4404 11823 4426 11823 4425 11805
      4410 11769 4373 11854 4392 11880
TIME...MOT...LOC 0050Z 231DEG 33KT 4396 11848

SP

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 29, 5:08 PM PDT	Special Weather Statement	BOI	Jerome	52 min
Apr 29, 5:50 PM PDT	Special Weather Statement	BOI		55 min
Apr 29, 7:21 PM PDT	Special Weather Statement	BOI		39 min
Apr 29, 7:29 PM PDT	Special Weather Statement	BOI	Adams	61 min
Apr 29, 7:53 PM PDT	Special Weather Statement	BOI		52 min
Apr 29, 8:04 PM PDT	Special Weather Statement	BOI		56 min
Apr 30, 12:39 PM PDT	Severe Thunderstorm Warning	BOI	Canyon, Owyhee	51 min
Apr 30, 1:13 PM PDT	Severe Thunderstorm Warning	BOI	Ada, Canyon, Elmore, Owyhee	47 min
Apr 30, 1:28 PM PDT	Severe Thunderstorm Warning	BOI	Ada, Boise, Canyon, Elmore, Gem	47 min
Apr 30, 1:33 PM PDT	Severe Thunderstorm Warning	BOI	Ada, Elmore, Owyhee	42 min
Apr 30, 1:48 PM PDT	Severe Thunderstorm Warning	BOI	Ada, Elmore	42 min
Apr 30, 2:12 PM PDT	Severe Thunderstorm Warning	BOI	Boise, Camas, Elmore, Gooding, Owyhee, Twin Falls	48 min
Apr 30, 2:56 PM PDT	Special Weather Statement	BOI	Camas, Gooding, Jerome	49 min
Apr 29, 5:26 PM PDT	Severe Thunderstorm Warning	BOI	Baker	64 min
Apr 29, 6:34 PM PDT	Severe Thunderstorm Warning	BOI	Baker	56 min
Apr 30, 12:13 PM PDT	Severe Thunderstorm Warning	BOI	Malheur	35 min
Apr 30, 12:21 PM PDT	Severe Thunderstorm Warning	BOI	Malheur	24 min

Nearby

Severe Thunderstorm Warnings in Oregon, 2020 Every severe thunderstorm warning in 2020

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.