Alert archive / California / Severe Thunderstorm Warnings in 2025

Severe Thunderstorm Warning 6, NWS San Francisco Bay Area, CA

February 4, 2025San Mateo County, Santa Clara County, California

NWS San Francisco Bay Area, CA issued this severe thunderstorm warning at Feb 4, 2025, 4:24 PM PST for San Mateo County, Santa Clara County, California. It was in force for 21 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: Feb 4, 2025, 4:24 PM PST (00:24 UTC)
Expired: Feb 4, 2025, 4:45 PM PST
In force: 21 min
Issued by: NWS San Francisco Bay Area, CA
Area: Storm-based polygon
Tornado: Possible
Hail: 0.0 in
Wind: 60.0 mph

Counties San Mateo County, CA, Santa Clara County, CA

The radar

The San Francisco radar (KMUX), 23 km from the middle of the area, began a volume at 00:29 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.

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 San Francisco Bay Area, CA wrote its last area forecast discussion before this severe thunderstorm warning went out at Feb 4, 3:54 PM PST, 30 minutes earlier.

Area forecast discussion, Feb 4, 3:54 PM PST, 30 minutes before

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In the hours before

Local storm report, Feb 4, 4:15 PM PST, 9 minutes before

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<body>
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    <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.
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      <p id="message2">
        Please try again in a few minutes.
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      <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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Local storm report, Feb 4, 4:17 PM PST, 7 minutes before

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<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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Local storm report, Feb 4, 4:19 PM PST, 5 minutes before

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</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>

Local storm report, Feb 4, 4:20 PM PST, 4 minutes before

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<head>
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  <title>Service Notice</title>
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</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>

Local storm report, Feb 4, 4:22 PM PST, 2 minutes before

<!doctype html>
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<head>
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  <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>

Local storm report, Feb 4, 4:24 PM PST, 0 minutes before

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<html lang="en">
<head>
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  <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>

The office that day

Everything else NWS San Francisco Bay Area, CA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Feb 4, 4:13 PM PST	Special Marine Warning	MTR		17 min
Feb 4, 5:33 PM PST	Special Weather Statement	MTR	Santa Cruz	27 min
Feb 4, 6:01 PM PST	Special Weather Statement	MTR	Santa Cruz	44 min
Feb 4, 6:57 PM PST	River Flood Warning	MTR	Napa	5 hr
Feb 4, 7:05 PM PST	River Flood Warning	MTR	Napa	5 hr
Feb 4, 8:38 PM PST	Small Craft Advisory	MTR		6 hr
Feb 5, 2:38 AM PST	Small Craft Advisory	MTR		48 hr
Feb 5, 9:57 AM PST	Frost Advisory	MTR	Alameda, Contra Costa, Marin, Monterey, Napa, Sonoma	19 hr
Feb 5, 12:36 PM PST	Flood Watch	MTR	Marin, Napa, Sonoma	41 hr
Feb 5, 2:12 PM PST	Gale Warning	MTR		37 hr
Feb 5, 2:12 PM PST	Small Craft Advisory	MTR		19 hr

Nearby

Severe Thunderstorm Warnings in California, 2025 Every severe thunderstorm warning in 2025

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; radar from the NEXRAD Level II archive.