Alert archive / Arizona / Special Weather Statements in 2018

Special Weather Statement, NWS Tucson, AZ

August 2, 2018Santa Cruz County, Arizona

NWS Tucson, AZ issued this special weather statement at Aug 2, 2018, 12:20 PM MST for Santa Cruz County, Arizona. It was in force for 25 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, 2018, 12:20 PM MST (19:20 UTC)
Expired: Aug 2, 2018, 12:45 PM MST
In force: 25 min
Issued by: NWS Tucson, AZ

County Santa Cruz County, AZ

The radar

The Tucson radar (KEMX), 13 km from the middle of the area, began a volume at 19:22 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 (KDMA), launched 12:00Z, 7.3 hours before the alert went out and 47 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: 234 J/kg
Mixed-layer CIN: -280 J/kg
Mixed-layer LCL: 2343 m above ground
0-6 km bulk shear: 14 kt
0-1 km storm-relative helicity: -8 m²/s²
0-3 km storm-relative helicity: -18 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 Aug 2, 10:11 AM MST, 2 hours 9 minutes earlier.

Area forecast discussion, Aug 2, 10:11 AM MST, 2 hours 9 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, Aug 2, 11:40 AM MST, 40 minutes before

Special Weather Statement
National Weather Service Tucson AZ
1140 AM MST THU AUG 2 2018

AZZ503-504-507-513-021915-
Upper San Pedro River Valley including Sierra
Vista/Benson-Dragoon/Mule/Huachuca and Santa Rita Mountains including
Bisbee/Canelo Hills/Madera Canyon-Upper Santa Cruz River and Altar
Valleys including Nogales-Tucson Metro Area including Tucson/Green
Valley/Marana/Vail-
1140 AM MST THU AUG 2 2018

...SIGNIFICANT WEATHER ADVISORY FOR EAST CENTRAL PIMA AND NORTH
CENTRAL SANTA CRUZ COUNTIES UNTIL 1215 PM MST...

At 1138 AM MST, Doppler radar was tracking a strong thunderstorm 14
miles southeast of Green Valley over the Santa Rita Mountains. This
storm was nearly stationary.

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

Locations impacted include...
Madera Canyon.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 3161 11079 3171 11094 3185 11075 3178 11066
TIME...MOT...LOC 1838Z 221DEG 3KT 3173 11080

KD

Special weather statement, Aug 2, 12:20 PM MST, 0 minutes before

Special Weather Statement
National Weather Service Tucson AZ
1220 PM MST THU AUG 2 2018

AZZ507-513-021945-
Upper San Pedro River Valley including Sierra
Vista/Benson-Dragoon/Mule/Huachuca and Santa Rita Mountains including
Bisbee/Canelo Hills/Madera Canyon-
1220 PM MST THU AUG 2 2018

...SIGNIFICANT WEATHER ADVISORY FOR EAST CENTRAL PIMA AND
NORTHEASTERN SANTA CRUZ COUNTIES UNTIL 1245 PM MST...

At 1220 PM MST, Doppler radar was tracking a strong thunderstorm 15
miles southeast of East Sahuarita, or 17 miles east of Green Valley.
This storm was nearly stationary.

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

Locations impacted include...
Highway 83 north of Sonoita.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 3170 11071 3172 11078 3186 11073 3193 11061
      3182 11056
TIME...MOT...LOC 1920Z 226DEG 4KT 3179 11072

KD

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 1, 5:00 PM MST	Special Weather Statement	TWC	Graham	30 min
Aug 1, 5:41 PM MST	Special Weather Statement	TWC	Santa Cruz	34 min
Aug 1, 5:59 PM MST	Special Weather Statement	TWC		46 min
Aug 1, 6:30 PM MST	Special Weather Statement	TWC	Santa Cruz	30 min
Aug 1, 7:19 PM MST	Special Weather Statement	TWC		41 min
Aug 1, 7:27 PM MST	Severe Thunderstorm Warning	TWC	Pima	48 min
Aug 1, 7:59 PM MST	Severe Thunderstorm Warning	TWC	Pima, Pinal	46 min
Aug 1, 8:14 PM MST	Severe Thunderstorm Warning	TWC	Pima	46 min
Aug 1, 8:25 PM MST	Areal Flood Advisory	TWC	Pima, Pinal	110 min
Aug 1, 8:44 PM MST	Flash Flood Warning	TWC	Pima, Pinal	2 hr
Aug 1, 9:17 PM MST	Flash Flood Warning	TWC	Pima	118 min
Aug 1, 9:21 PM MST	Special Weather Statement	TWC	Pima	54 min
Aug 2, 11:40 AM MST	Special Weather Statement	TWC	Santa Cruz	35 min
Aug 2, 2:48 PM MST	Special Weather Statement	TWC	Pima	42 min
Aug 2, 3:04 PM MST	Special Weather Statement	TWC	Pima	41 min
Aug 2, 3:08 PM MST	Special Weather Statement	TWC	Pima	52 min
Aug 2, 4:05 PM MST	Special Weather Statement	TWC	Pima	40 min
Aug 2, 4:12 PM MST	Severe Thunderstorm Warning	TWC	Pima	48 min
Aug 2, 4:38 PM MST	Severe Thunderstorm Warning	TWC	Pima	37 min

Nearby

Special Weather Statements in Arizona, 2018 Every special weather statement in 2018

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.