Alert archive / California / Special Weather Statements in 2021

Special Weather Statement, NWS Reno, NV

July 31, 2021Lassen County, California

NWS Reno, NV issued this special weather statement at Jul 31, 2021, 1:22 PM PDT for Lassen County, California. It was in force for 38 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 31, 2021, 1:22 PM PDT (20:22 UTC)
Expired: Jul 31, 2021, 2:00 PM PDT
In force: 38 min
Issued by: NWS Reno, NV

County Lassen County, CA

The radar

The Beale AFB radar (KBBX), 123 km from the middle of the area, began a volume at 20:24 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

Reno, NV (KREV), launched 12:00Z, 8.4 hours before the alert went out and 268 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: 1 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 2114 m above ground
0-6 km bulk shear: 4 kt
0-1 km storm-relative helicity: -11 m²/s²
0-3 km storm-relative helicity: 20 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 Reno, NV wrote its last area forecast discussion before this special weather statement went out at Jul 31, 3:06 AM PDT, 10 hours 16 minutes earlier.

Area forecast discussion, Jul 31, 3:06 AM PDT, 10 hours 16 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, Jul 31, 1:22 PM PDT, 0 minutes before

Special Weather Statement
National Weather Service Reno NV
122 PM PDT Sat Jul 31 2021

CAZ071-312100-
Lassen-Eastern Plumas-Eastern Sierra Counties CA-
122 PM PDT Sat Jul 31 2021

...STRONG THUNDERSTORM DEVELOPING ALONG HIGHWAY 44 NEAR BOGARD...

At 117 PM PDT, Doppler radar was tracking a strong thunderstorm
near Highway 44 just south of Bogard.

Half inch hail and winds in excess of 45 mph will be possible with
this storm.

Blinding downpours may result in sudden drops in visibility for
motorists along with ponding of water on roadways.

Locations impacted include...
Highway 44 near Bogard and Crater Lake Campground

LAT...LON 4045 12120 4058 12124 4069 12100 4045 12081
TIME...MOT...LOC 2017Z 267DEG 11KT 4050 12111

TF

The office that day

Everything else NWS Reno, NV issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 30, 5:02 PM PDT	Special Weather Statement	REV		88 min
Jul 30, 5:10 PM PDT	Flash Flood Warning	REV	Douglas	110 min
Jul 30, 5:34 PM PDT	Special Weather Statement	REV	Churchill, Douglas, Lyon, Mineral, Pershing, Storey and 1 more	86 min
Jul 30, 6:25 PM PDT	Flash Flood Warning	REV	Douglas	107 min
Jul 30, 6:27 PM PDT	Areal Flood Advisory	REV	Douglas, Lyon	6 hr
Jul 31, 4:40 PM PDT	Special Weather Statement	REV	Mineral	50 min
Jul 30, 5:42 PM PDT	Areal Flood Advisory	REV	Alpine, Mono	3 hr
Jul 31, 2:04 PM PDT	Special Weather Statement	REV	Lassen	41 min
Jul 31, 2:34 PM PDT	Flash Flood Warning Considerable damage threat	REV	Alpine, Mono	116 min
Jul 31, 3:14 PM PDT	Special Weather Statement	REV	Alpine	31 min
Jul 31, 3:41 PM PDT	Areal Flood Advisory	REV	Mono	3 hr

Nearby

Special Weather Statements in California, 2021 Every 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.