Alert archive / Arizona / Special Weather Statements in 2019

Special Weather Statement, NWS Phoenix, AZ

August 7, 2019

NWS Phoenix, AZ issued this special weather statement at Aug 7, 2019, 11:40 AM MST. It was in force for 50 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 7, 2019, 11:40 AM MST (18:40 UTC)
Expired: Aug 7, 2019, 12:30 PM MST
In force: 50 min
Issued by: NWS Phoenix, AZ

The radar

The Yuma radar (KYUX), 22 km from the middle of the area, began a volume at 18:42 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, 6.7 hours before the alert went out and 228 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: 1405 m above ground
0-6 km bulk shear: 12 kt
0-1 km storm-relative helicity: -20 m²/s²
0-3 km storm-relative helicity: -21 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 Aug 7, 11:12 AM MST, 28 minutes earlier.

Area forecast discussion, Aug 7, 11:12 AM MST, 28 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, Aug 7, 11:40 AM MST, 0 minutes before

Special Weather Statement
National Weather Service Phoenix AZ
1140 AM MST Wed Aug 7 2019

AZZ532-CAZ565-569-071930-
Yuma AZ-Imperial County Southeast CA-Palo Verde Valley CA-
1140 AM MST Wed Aug 7 2019

...SIGNIFICANT WEATHER ADVISORY FOR WESTERN YUMA AND SOUTHEASTERN
IMPERIAL COUNTIES UNTIL 1230 PM MST/1230 PM PDT/...

At 1139 AM MST/1139 AM PDT/, Doppler radar was tracking a strong
thunderstorm near Somerton, moving north at 30 mph.

Winds in excess of 40 mph and brief heavy rain will be possible with
this storm.

Locations impacted include...
Yuma, Somerton, Gadsden, Winterhaven and Andrade.

This includes CA Interstate 8 between mile markers 82 and 96.

LAT...LON 3255 11478 3257 11481 3258 11480 3262 11481
      3263 11478 3272 11472 3271 11487 3293 11488
      3291 11456 3254 11466
TIME...MOT...LOC 1839Z 185DEG 24KT 3263 11476

MP

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 7, 12:22 PM MST	Special Weather Statement	PSR		38 min
Aug 7, 12:32 PM MST	Special Weather Statement	PSR	La Paz	43 min
Aug 7, 12:33 PM MST	Special Weather Statement	PSR	La Paz	42 min
Aug 7, 12:36 PM MST	Special Weather Statement	PSR	Yuma	39 min
Aug 7, 12:56 PM MST	Special Weather Statement	PSR	La Paz	49 min
Aug 7, 1:18 PM MST	Severe Thunderstorm Warning	PSR	La Paz	27 min
Aug 7, 1:19 PM MST	Areal Flood Advisory	PSR	La Paz, Yuma	3 hr
Aug 7, 1:36 PM MST	Special Weather Statement	PSR	Gila	39 min
Aug 7, 1:38 PM MST	Flash Flood Warning	PSR	La Paz, Yuma	4 hr
Aug 7, 1:41 PM MST	Special Weather Statement	PSR	La Paz	49 min
Aug 7, 1:44 PM MST	Severe Thunderstorm Warning	PSR	La Paz	46 min
Aug 7, 1:48 PM MST	Special Weather Statement	PSR		42 min
Aug 7, 1:54 PM MST	Severe Thunderstorm Warning	PSR	Maricopa	36 min
Aug 7, 2:02 PM MST	Areal Flood Advisory	PSR	Gila	3 hr
Aug 7, 2:11 PM MST	Special Weather Statement	PSR	La Paz	49 min
Aug 7, 2:12 PM MST	Areal Flood Advisory	PSR	Maricopa	2 hr
Aug 7, 2:25 PM MST	Flash Flood Warning	PSR	La Paz	4 hr
Aug 7, 2:44 PM MST	Flash Flood Warning	PSR	La Paz	4 hr
Aug 7, 2:44 PM MST	Special Weather Statement	PSR		46 min
Aug 7, 2:57 PM MST	Flash Flood Warning	PSR	La Paz, Maricopa	4 hr
Aug 7, 3:13 PM MST	Severe Thunderstorm Warning	PSR	Maricopa	19 min
Aug 7, 3:58 PM MST	Dust Storm Advisory	PSR	Maricopa	62 min
Aug 7, 4:08 PM MST	Special Weather Statement	PSR	Maricopa	37 min
Aug 7, 4:14 PM MST	Special Weather Statement	PSR		31 min
Aug 7, 4:15 PM MST	Special Weather Statement	PSR	Maricopa	30 min
Aug 7, 4:28 PM MST	Severe Thunderstorm Warning	PSR	Maricopa	17 min
Aug 7, 4:33 PM MST	Dust Storm Advisory	PSR	Maricopa	42 min
Aug 7, 4:47 PM MST	Special Weather Statement	PSR	Maricopa	43 min
Aug 7, 4:57 PM MST	Dust Storm Advisory	PSR	Maricopa, Pinal	48 min
Aug 7, 8:54 AM MST	Areal Flood Advisory	PSR	Imperial	3 hr

Nearby

Special Weather Statements in Arizona, 2019 Every special weather statement in 2019

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.