Alert archive / California / Special Weather Statements in 2017

Special Weather Statement, NWS Sacramento, CA

August 2, 2017Tuolumne County, California

NWS Sacramento, CA issued this special weather statement at Aug 2, 2017, 3:28 PM PDT for Tuolumne County, California. It was in force for 47 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 2, 2017, 3:28 PM PDT (22:28 UTC)
Expired: Aug 2, 2017, 4:15 PM PDT
In force: 47 min
Issued by: NWS Sacramento, CA

County Tuolumne County, CA

The radar

The Sacramento radar (KDAX), 165 km from the middle of the area, began a volume at 22:30 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

Oakland, CA (KOAK), launched 12:00Z, 10.5 hours before the alert went out and 207 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: 2529 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 4 m²/s²
0-3 km storm-relative helicity: 25 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

<!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>

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 Sacramento, CA wrote its last area forecast discussion before this special weather statement went out at Aug 2, 3:40 AM PDT, 11 hours 48 minutes earlier.

Area forecast discussion, Aug 2, 3:40 AM PDT, 11 hours 48 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, Aug 2, 1:28 PM PDT, 2 hours 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, Aug 2, 2:34 PM PDT, 54 minutes before

Special Weather Statement
National Weather Service Sacramento CA
234 PM PDT WED AUG 2 2017

CAZ069-022215-
West Slope Northern Sierra Nevada CA-
234 PM PDT WED AUG 2 2017

...SPECIAL WEATHER STATEMENT...

At 233 PM PDT, Doppler radar was tracking a strong thunderstorm 7
miles south of Kennedy Meadow, or 11 miles southwest of Sonora Pass.
This storm was nearly stationary.

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

This storm will remain over mainly rural areas of northeastern
Tuolumne County.

LAT...LON 3810 11989 3831 11980 3824 11962 3811 11973
TIME...MOT...LOC 2133Z 063DEG 3KT 3820 11975

cs

Special weather statement, Aug 2, 3:28 PM PDT, 0 minutes before

Special Weather Statement
National Weather Service Sacramento CA
328 PM PDT WED AUG 2 2017

CAZ069-022315-
West Slope Northern Sierra Nevada CA-
328 PM PDT WED AUG 2 2017

...SPECIAL WEATHER STATEMENT...

At 327 PM PDT, Doppler radar was tracking a strong thunderstorm 8
miles southeast of Pinecrest, or 21 miles southwest of Sonora Pass,
moving southwest at 10 mph.

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

This storm will remain over mainly rural areas of east central
Tuolumne County.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 3808 11980 3809 11984 3803 11989 3799 11988
      3798 11989 3793 11996 3809 12010 3821 11988
      3809 11976
TIME...MOT...LOC 2227Z 051DEG 9KT 3810 11989

IDM

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 2, 1:28 PM PDT	Special Weather Statement	STO	Alpine	47 min
Aug 2, 2:34 PM PDT	Special Weather Statement	STO	Tuolumne	41 min

Nearby

Special Weather Statements in California, 2017 Every special weather statement in 2017

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.