Alert archive / Arizona / Special Weather Statements in 2021

Special Weather Statement, NWS Phoenix, AZ

August 29, 2021Yuma County, Arizona

NWS Phoenix, AZ issued this special weather statement at Aug 29, 2021, 7:27 AM MST for Yuma County, Arizona. It was in force for 48 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 29, 2021, 7:27 AM MST (14:27 UTC)
Expired: Aug 29, 2021, 8:15 AM MST
In force: 48 min
Issued by: NWS Phoenix, AZ
Hail: 0.00 in
Wind: 40

County Yuma County, AZ

The radar

The Yuma radar (KYUX), 13 km from the middle of the area, began a volume at 14:30 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

San Diego, CA (KNKX), launched 12:00Z, 2.5 hours before the alert went out and 241 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: 2595 m above ground
0-6 km bulk shear: 14 kt
0-1 km storm-relative helicity: -9 m²/s²
0-3 km storm-relative helicity: 35 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 Phoenix, AZ wrote its last area forecast discussion before this special weather statement went out at Aug 29, 5:07 AM MST, 2 hours 20 minutes earlier.

Area forecast discussion, Aug 29, 5:07 AM MST, 2 hours 20 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 29, 5:35 AM MST, 1 hour 52 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>

Special weather statement, Aug 29, 6:51 AM MST, 36 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>

Special weather statement, Aug 29, 7:27 AM MST, 0 minutes before

Special Weather Statement
National Weather Service Phoenix AZ
727 AM MST Sun Aug 29 2021

AZZ532-535-536-CAZ565-291515-
Gila River Valley AZ-Southeast Yuma County AZ-Yuma AZ-
Imperial County Southeast CA-
727 AM MST Sun Aug 29 2021

...A strong thunderstorm will impact portions of west central Yuma
and southeastern Imperial Counties through 815 AM MST/815 AM PDT/...

At 727 AM MST/727 AM PDT/, Doppler radar was tracking strong
thunderstorms from Yuma to Wellton, moving west at 15 mph.

HAZARD...Winds in excess of 40 mph.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects.

Locations impacted include...
Yuma, Somerton, Gadsden, Fortuna Foothills, San Luis, Wellton,
Blaisdell, Kinter, Andrade, Ligurta, Winterhaven and Araby.

This includes the following highways...
AZ Interstate 8 between mile markers 1 and 32.
CA Interstate 8 between mile markers 88 and 96.
AZ Route 95 between mile markers 29 and 41.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

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

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 3249 11480 3251 11482 3255 11479 3256 11481
      3262 11481 3263 11478 3272 11472 3272 11479
      3280 11477 3278 11420 3267 11412 3256 11416
      3246 11458
TIME...MOT...LOC 1427Z 086DEG 13KT 3265 11460

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...40 MPH

SDB

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 28, 6:21 PM MST	Special Weather Statement	PSR		39 min
Aug 28, 6:48 PM MST	Dust Storm Warning	PSR	Pinal	42 min
Aug 28, 7:14 PM MST	Dust Storm Advisory	PSR	Maricopa, Pinal	31 min
Aug 29, 1:15 AM MST	Special Weather Statement	PSR	Yuma	45 min
Aug 29, 5:35 AM MST	Special Weather Statement	PSR		25 min
Aug 29, 6:51 AM MST	Special Weather Statement	PSR	Yuma	39 min
Aug 29, 8:18 AM MST	Special Weather Statement	PSR	Yuma	42 min
Aug 29, 8:22 AM MST	Areal Flood Advisory	PSR	Yuma	3 hr
Aug 29, 4:31 PM MST	Special Weather Statement	PSR		44 min
Aug 29, 4:49 PM MST	Areal Flood Advisory	PSR	Maricopa	3 hr
Aug 29, 1:14 PM MST	Special Weather Statement	PSR	Riverside	31 min
Aug 29, 3:30 PM MST	Special Weather Statement	PSR	Riverside	30 min
Aug 29, 4:01 PM MST	Special Weather Statement	PSR	Riverside	29 min
Aug 29, 4:29 PM MST	Flash Flood Warning Considerable damage threat	PSR	Riverside, San Bernardino	3 hr

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.