Alert archive / California / Special Weather Statements in 2017

Special Weather Statement, NWS Phoenix, AZ

August 2, 2017Imperial County, California

NWS Phoenix, AZ issued this special weather statement at Aug 2, 2017, 3:06 PM PDT for Imperial County, California. It was in force for 24 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, 3:06 PM PDT (22:06 UTC)
Expired: Aug 2, 2017, 3:30 PM PDT
In force: 24 min
Issued by: NWS Phoenix, AZ

County Imperial County, CA

The radar

The Yuma radar (KYUX), 46 km from the middle of the area, began a volume at 22:07 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

Yuma Prvg Ground, AZ (K1Y7), launched 12:00Z, 10.1 hours before the alert went out and 58 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: 287 J/kg
Mixed-layer CIN: -216 J/kg
Mixed-layer LCL: 1983 m above ground
0-6 km bulk shear: 4 kt
0-1 km storm-relative helicity: -5 m²/s²
0-3 km storm-relative helicity: 11 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 2, 2:39 PM PDT, 27 minutes earlier.

Area forecast discussion, Aug 2, 2:39 PM PDT, 27 minutes before

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<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>
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        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

Local storm report, Aug 2, 12:09 PM PDT, 2 hours 57 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PHOENIX AZ
1209 PM MST WED AUG 2 2017

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0845 PM     FLASH FLOOD      10 NNE CENTENNIAL       33.70N 113.30W
08/01/2017                   MARICOPA           AZ   DEPT OF HIGHWAYS

            6 INCHES TO 1 FOOT OF WATER FLOW OVER EAGLE
            EYE ROAD AT TIGER WASH. ROAD CLOSED. TIMING
            BASED ON MARICOPA COUNTY FLOOD CONTROL
            STREAM GAGE. DELAYED REPORT.

&&

MS

Special weather statement, Aug 2, 2:53 PM PDT, 13 minutes before

Special Weather Statement
National Weather Service Phoenix AZ
253 PM PDT WED AUG 2 2017

CAZ565-567-022245-
Imperial County Southeast CA-Imperial Valley CA-
253 PM PDT WED AUG 2 2017

...SIGNIFICANT WEATHER ADVISORY FOR SOUTH CENTRAL IMPERIAL COUNTY
UNTIL 345 PM PDT...

At 253 PM PDT, Doppler radar was tracking a strong thunderstorm 7
miles south of Holtville, or 10 miles east of Calexico, moving
northwest at 10 mph.

Winds in excess of 40 mph will be possible with this storm.

Locations impacted include...
Calexico, Holtville, Bonds Corner and Heber.

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.

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 3267 11557 3289 11542 3273 11523 3268 11527
      3266 11550
TIME...MOT...LOC 2153Z 121DEG 7KT 3271 11533

Hernandez

Special weather statement, Aug 2, 3:06 PM PDT, 0 minutes before

Special Weather Statement
National Weather Service Phoenix AZ
306 PM PDT WED AUG 2 2017

CAZ565-022230-
Imperial County Southeast CA-
306 PM PDT WED AUG 2 2017

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN IMPERIAL COUNTY
UNTIL 330 PM PDT...

At 306 PM PDT, Doppler radar was tracking a strong thunderstorm 9
miles north of Algodones Dunes, or 17 miles northwest of Yuma, moving
northwest at 10 mph.

Winds in excess of 40 mph will be possible with this storm.

This storm will remain over mainly rural areas of southeastern
Imperial County.

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.

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 3289 11472 3278 11479 3282 11503 3301 11490
TIME...MOT...LOC 2206Z 119DEG 7KT 3287 11482

Hernandez

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 1, 5:05 PM PDT	Blowing Dust Advisory	PSR	La Paz, Maricopa, Pinal	3 hr
Aug 1, 5:20 PM PDT	Special Weather Statement	PSR		40 min
Aug 1, 5:26 PM PDT	Areal Flood Advisory	PSR	Maricopa, Pinal	3 hr
Aug 1, 5:45 PM PDT	Severe Thunderstorm Warning	PSR	Maricopa	30 min
Aug 1, 6:20 PM PDT	Special Weather Statement	PSR		40 min
Aug 1, 6:26 PM PDT	Areal Flood Advisory	PSR	Maricopa	3 hr
Aug 1, 6:48 PM PDT	Flash Flood Warning	PSR	Maricopa	3 hr
Aug 1, 7:41 PM PDT	Special Weather Statement	PSR	La Paz	49 min
Aug 1, 8:02 PM PDT	Special Weather Statement	PSR		43 min
Aug 2, 2:39 PM PDT	Areal Flood Advisory	PSR	La Paz	3 hr
Aug 2, 4:41 PM PDT	Special Weather Statement	PSR		34 min
Aug 2, 4:42 PM PDT	Special Weather Statement	PSR	Yuma	48 min
Aug 2, 2:53 PM PDT	Special Weather Statement	PSR	Imperial	52 min
Aug 2, 3:28 PM PDT	Areal Flood Advisory	PSR	Imperial	3 hr
Aug 2, 3:38 PM PDT	Special Weather Statement	PSR	Imperial	52 min
Aug 2, 3:43 PM PDT	Areal Flood Advisory	PSR	Imperial	2 hr
Aug 2, 4:00 PM PDT	Special Weather Statement	PSR	Riverside	45 min
Aug 2, 4:13 PM PDT	Flash Flood Warning	PSR	Imperial	3 hr
Aug 2, 4:21 PM PDT	Special Weather Statement	PSR	Imperial	24 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.