Alert archive / Arizona / Special Weather Statements in 2021

Special Weather Statement, NWS Phoenix, AZ

July 2, 2021

NWS Phoenix, AZ issued this special weather statement at Jul 2, 2021, 4:12 PM MST. It was in force for 33 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 2, 2021, 4:12 PM MST (23:12 UTC)
Expired: Jul 2, 2021, 4:45 PM MST
In force: 33 min
Issued by: NWS Phoenix, AZ

The radar

The Phoenix radar (KIWA), 90 km from the middle of the area, began a volume at 23:15 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

Tuscon, AZ (KTUS), launched 12:00Z, 11.2 hours before the alert went out and 102 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: 385 J/kg
Mixed-layer CIN: -127 J/kg
Mixed-layer LCL: 1652 m above ground
0-6 km bulk shear: 13 kt
0-1 km storm-relative helicity: 37 m²/s²
0-3 km storm-relative helicity: 75 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 Phoenix, AZ wrote its last area forecast discussion before this special weather statement went out at Jul 2, 3:40 PM MST, 32 minutes earlier.

Area forecast discussion, Jul 2, 3:40 PM MST, 32 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, Jul 2, 4:12 PM MST, 0 minutes before

Special Weather Statement
National Weather Service Phoenix AZ
412 PM MST Fri Jul 2 2021

AZZ558-561-022345-
Dripping Springs AZ-Pinal/Superstition Mountains AZ-
412 PM MST Fri Jul 2 2021

...SIGNIFICANT WEATHER ADVISORY FOR GILA AND PINAL COUNTIES UNTIL 445
PM MST...

At 412 PM MST, Doppler radar was tracking a strong thunderstorm over
Christmas, moving west at 15 mph.

Pea size hail and winds in excess of 40 mph will be possible with
this storm.

Locations impacted include...
Hayden and Christmas.

This includes the following highways...
AZ Route 77 between mile markers 135 and 141, near mile marker 143,
and between mile markers 146 and 154.
AZ Route 177 between mile markers 137 and 138.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with this storm, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

&&

LAT...LON 3311 11068 3308 11070 3308 11071 3307 11073
      3304 11072 3299 11077 3299 11079 3317 11090
      3313 11064
TIME...MOT...LOC 2312Z 094DEG 12KT 3306 11070

SDB

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 1, 8:16 PM MST	Flash Flood Warning Considerable damage threat	PSR	Gila	4 hr
Jul 1, 9:37 PM MST	Flash Flood Warning Considerable damage threat	PSR	Maricopa	4 hr
Jul 1, 9:57 PM MST	Special Weather Statement	PSR		48 min
Jul 1, 10:22 PM MST	Flash Flood Warning Considerable damage threat	PSR	Maricopa	4 hr
Jul 2, 4:00 PM MST	Flash Flood Warning Considerable damage threat	PSR	Gila	4 hr
Jul 2, 4:50 PM MST	Special Weather Statement	PSR	Gila	25 min

Nearby

Special Weather Statements in Arizona, 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.