Alert archive / California / Special Weather Statements in 2020

Special Weather Statement, NWS San Diego, CA

August 15, 2020San Diego County, California

NWS San Diego, CA issued this special weather statement at Aug 15, 2020, 1:16 PM PDT for San Diego County, California. It was in force for 29 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: Aug 15, 2020, 1:16 PM PDT (20:16 UTC)
Expired: Aug 15, 2020, 1:45 PM PDT
In force: 29 min
Issued by: NWS San Diego, CA

County San Diego County, CA

The radar

The San Diego radar (KNKX), 65 km from the middle of the area, began a volume at 20:16 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

San Diego, CA (KNKX), launched 12:00Z, 8.3 hours before the alert went out and 83 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 2542 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 8 m²/s²
0-3 km storm-relative helicity: 113 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

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 San Diego, CA wrote its last area forecast discussion before this special weather statement went out at Aug 15, 9:10 AM PDT, 4 hours 6 minutes earlier.

Area forecast discussion, Aug 15, 9:10 AM PDT, 4 hours 6 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, Aug 15, 12:20 PM PDT, 56 minutes before

Special Weather Statement
National Weather Service San Diego CA
1220 PM PDT Sat Aug 15 2020

CAZ055-151945-
San Bernardino County Mountains CA-
1220 PM PDT Sat Aug 15 2020

...SIGNIFICANT WEATHER ADVISORY FOR SAN BERNARDINO COUNTY UNTIL 1245
PM PDT...

At 1218 PM PDT, meteorologists were tracking a strong thunderstorm
over Hwy 38 Between Yucaipa And Onyx Summit, or 5 miles southwest of
Big Bear City. This storm was nearly stationary.

Pea size hail and wind gusts up to 50 mph will be possible with this
storm.

Locations impacted include...
Big Bear City, Big Bear Lake, Seven Oaks, Hwy 38 Between Yucaipa And
Onyx Summit, Hwy 38 Between Onyx Summit And Sugarloaf, Heart Bar
Campground, Barton Flats Campground and Woodlands.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 3410 11690 3419 11700 3429 11685 3418 11675
TIME...MOT...LOC 1918Z 213DEG 3KT 3419 11687

Gregoria

Special weather statement, Aug 15, 1:16 PM PDT, 0 minutes before

Special Weather Statement
National Weather Service San Diego CA
116 PM PDT Sat Aug 15 2020

CAZ048-056-058-152045-
San Diego County Mountains CA-Riverside County Mountains CA-
San Bernardino and Riverside County Valleys-The Inland Empire CA-
116 PM PDT Sat Aug 15 2020

...SIGNIFICANT WEATHER ADVISORY FOR RIVERSIDE AND NORTH CENTRAL SAN
DIEGO COUNTIES UNTIL 145 PM PDT...

At 113 PM PDT, Meteorologist were tracking a strong thunderstorm
over Hwy 79 Between Oak Grove And Aguanga, or 10 miles southwest of
Anza. his storm was nearly stationary.

Wind gusts of 50 to 55 mph and pea size hail will be possible with
this storm.

Locations impacted include...
Anza, Aguanga, Warner Springs, Palomar Mountain, Hwy 79 Between Oak
Grove And Aguanga.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 3360 11663 3327 11657 3328 11681 3336 11696
      3360 11698
TIME...MOT...LOC 2013Z 090DEG 1KT 3343 11678

Gregoria

The office that day

Everything else NWS San Diego, CA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 15, 12:20 PM PDT	Special Weather Statement	SGX		25 min
Aug 15, 1:47 PM PDT	Areal Flood Advisory	SGX	San Bernardino	3 hr
Aug 15, 1:56 PM PDT	Special Weather Statement	SGX		49 min
Aug 15, 2:24 PM PDT	Severe Thunderstorm Warning	SGX	Riverside, San Diego	55 min
Aug 15, 4:12 PM PDT	Special Weather Statement	SGX	San Diego	33 min

Nearby

Special Weather Statements in California, 2020 Every special weather statement 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.