Alert archive / Arizona / Special Weather Statements in 2021

Special Weather Statement, NWS Tucson, AZ

July 4, 2021Santa Cruz County, Arizona

NWS Tucson, AZ issued this special weather statement at Jul 4, 2021, 2:39 PM MST for Santa Cruz County, Arizona. It was in force for 51 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 4, 2021, 2:39 PM MST (21:39 UTC)
Expired: Jul 4, 2021, 3:30 PM MST
In force: 51 min
Issued by: NWS Tucson, AZ

County Santa Cruz County, AZ

The radar

The Tucson radar (KEMX), 70 km from the middle of the area, began a volume at 21:39 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, 9.7 hours before the alert went out and 89 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: 550 J/kg
Mixed-layer CIN: -109 J/kg
Mixed-layer LCL: 910 m above ground
0-6 km bulk shear: 12 kt
0-1 km storm-relative helicity: 13 m²/s²
0-3 km storm-relative helicity: 44 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 Tucson, AZ wrote its last area forecast discussion before this special weather statement went out at Jul 4, 9:40 AM MST, 4 hours 59 minutes earlier.

Area forecast discussion, Jul 4, 9:40 AM MST, 4 hours 59 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.
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In the hours before

Special weather statement, Jul 4, 2:39 PM MST, 0 minutes before

Special Weather Statement
National Weather Service Tucson AZ
239 PM MST Sun Jul 4 2021

AZZ503-042230-
Upper Santa Cruz River and Altar Valleys including Nogales-
239 PM MST Sun Jul 4 2021

...SIGNIFICANT WEATHER ADVISORY FOR SOUTH CENTRAL SANTA CRUZ COUNTY
UNTIL 330 PM MST...

At 239 PM MST, Doppler radar was tracking a strong thunderstorm near
Nogales. This storm was nearly stationary.

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

Locations impacted include...
Nogales and Pena Blanca Lake.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3135 11112 3136 11116 3153 11112 3143 11089
      3133 11091 3133 11108
TIME...MOT...LOC 2139Z 100DEG 3KT 3138 11100

Carpenter

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 4, 11:35 AM MST	Areal Flood Advisory	TWC	Cochise	3 hr
Jul 4, 11:41 AM MST	Areal Flood Advisory	TWC	Cochise	3 hr
Jul 4, 12:03 PM MST	Flash Flood Warning Considerable damage threat	TWC	Cochise	3 hr
Jul 4, 12:33 PM MST	Flash Flood Warning Considerable damage threat	TWC	Cochise	3 hr
Jul 4, 1:02 PM MST	Areal Flood Advisory	TWC	Cochise	3 hr
Jul 4, 1:17 PM MST	Areal Flood Advisory	TWC	Pima	3 hr
Jul 4, 2:20 PM MST	Areal Flood Advisory	TWC	Santa Cruz	3 hr
Jul 4, 3:08 PM MST	Severe Thunderstorm Warning	TWC	Pima, Santa Cruz	52 min
Jul 4, 3:44 PM MST	Areal Flood Advisory	TWC	Pima	2 hr
Jul 4, 4:01 PM MST	Special Weather Statement	TWC	Santa Cruz	44 min
Jul 4, 4:25 PM MST	Areal Flood Advisory	TWC	Pima	3 hr
Jul 4, 4:36 PM MST	Special Weather Statement	TWC	Graham	24 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.