Alert archive / Arizona / Special Weather Statements in 2020

Special Weather Statement, NWS Flagstaff, AZ

August 17, 2020Yavapai County, Arizona

NWS Flagstaff, AZ issued this special weather statement at Aug 17, 2020, 6:21 PM MST for Yavapai County, Arizona. It was in force for 39 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 17, 2020, 6:21 PM MST (01:21 UTC)
Expired: Aug 17, 2020, 7:00 PM MST
In force: 39 min
Issued by: NWS Flagstaff, AZ

County Yavapai County, AZ

The radar

The Flagstaff radar (KFSX), 106 km from the middle of the area, began a volume at 01:24 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

Phoenix, AZ (KPSR), launched 00:00Z, 1.4 hours before the alert went out and 136 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: 215 J/kg
Mixed-layer CIN: -136 J/kg
Mixed-layer LCL: 4201 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 5 m²/s²
0-3 km storm-relative helicity: 50 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

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>

The office that day

Everything else NWS Flagstaff, AZ issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 17, 5:07 PM MST	Special Weather Statement	FGZ	Gila	38 min
Aug 17, 5:48 PM MST	Special Weather Statement	FGZ	Gila	42 min
Aug 17, 6:00 PM MST	Severe Thunderstorm Warning	FGZ	Gila	45 min
Aug 17, 6:58 PM MST	Special Weather Statement	FGZ	Yavapai	47 min
Aug 18, 12:51 PM MST	Special Weather Statement	FGZ		39 min
Aug 18, 1:29 PM MST	Severe Thunderstorm Warning	FGZ	Coconino, Yavapai	31 min
Aug 18, 2:36 PM MST	Special Weather Statement	FGZ		39 min
Aug 18, 3:26 PM MST	Severe Thunderstorm Warning	FGZ	Yavapai	34 min
Aug 18, 4:29 PM MST	Special Weather Statement	FGZ	Yavapai	31 min

Nearby

Special Weather Statements in Arizona, 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.