Alert archive / Arizona / Special Weather Statements in 2021

Special Weather Statement, NWS Flagstaff, AZ

July 16, 2021

NWS Flagstaff, AZ issued this special weather statement at Jul 16, 2021, 12:52 PM MST. It was in force for 23 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 16, 2021, 12:52 PM MST (19:52 UTC)
Expired: Jul 16, 2021, 1:15 PM MST
In force: 23 min
Issued by: NWS Flagstaff, AZ

The radar

The Flagstaff radar (KFSX), 134 km from the middle of the area, began a volume at 19:56 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

Phoenix, AZ (KPSR), launched 12:00Z, 7.9 hours before the alert went out and 190 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: 2375 m above ground
0-6 km bulk shear: 11 kt
0-1 km storm-relative helicity: 19 m²/s²
0-3 km storm-relative helicity: 52 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 Flagstaff, AZ wrote its last area forecast discussion before this special weather statement went out at Jul 16, 8:40 AM MST, 4 hours 12 minutes earlier.

Area forecast discussion, Jul 16, 8:40 AM MST, 4 hours 12 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.
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In the hours before

Special weather statement, Jul 16, 12:52 PM MST, 0 minutes before

Special Weather Statement
National Weather Service Flagstaff AZ
1252 PM MST Fri Jul 16 2021

AZZ017-018-162015-
Northern Gila County-White Mountains-
1252 PM MST Fri Jul 16 2021

...SIGNIFICANT WEATHER ADVISORY FOR GILA AND NAVAJO COUNTIES UNTIL
115 PM MST...

At 1252 PM MST, Doppler radar was tracking a strong thunderstorm near
Rainbow City, moving south at 5 mph.

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

Locations impacted include...
Whiteriver, Turkey Creek, Seven Mile, Rainbow City, Fort Apache, Fort
Apache Reservation, East Fork and Canyon Day.

LAT...LON 3401 11001 3396 10988 3373 10992 3380 11015
TIME...MOT...LOC 1952Z 017DEG 5KT 3392 10994

ET

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 15, 5:20 PM MST	Areal Flood Advisory	FGZ	Yavapai	115 min
Jul 15, 6:33 PM MST	Severe Thunderstorm Warning	FGZ	Yavapai	27 min
Jul 15, 6:55 PM MST	Areal Flood Advisory	FGZ	Yavapai	3 hr
Jul 15, 8:21 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Yavapai	114 min
Jul 16, 11:56 AM MST	Flash Flood Warning Considerable damage threat	FGZ	Coconino	3 hr
Jul 16, 12:03 PM MST	Areal Flood Advisory	FGZ	Yavapai	2 hr
Jul 16, 12:36 PM MST	Areal Flood Advisory	FGZ	Coconino	2 hr
Jul 16, 1:16 PM MST	Severe Thunderstorm Warning	FGZ	Coconino	29 min
Jul 16, 1:20 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Coconino	115 min
Jul 16, 1:24 PM MST	Severe Thunderstorm Warning	FGZ	Gila, Navajo	51 min
Jul 16, 1:44 PM MST	Special Weather Statement	FGZ		46 min
Jul 16, 2:13 PM MST	Severe Thunderstorm Warning	FGZ	Gila, Navajo	32 min
Jul 16, 2:25 PM MST	Areal Flood Advisory	FGZ	Coconino	3 hr
Jul 16, 2:59 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Coconino	61 min
Jul 16, 3:14 PM MST	Special Weather Statement	FGZ		31 min
Jul 16, 3:43 PM MST	Severe Thunderstorm Warning	FGZ	Coconino, Yavapai	32 min
Jul 16, 4:18 PM MST	Severe Thunderstorm Warning	FGZ	Yavapai	12 min
Jul 16, 4:34 PM MST	Severe Thunderstorm Warning	FGZ	Gila	41 min
Jul 16, 4:41 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Gila	3 hr
Jul 16, 4:48 PM MST	Severe Thunderstorm Warning	FGZ	Coconino, Gila	20 min
Jul 16, 4:59 PM MST	Severe Thunderstorm Warning	FGZ	Gila, Yavapai	15 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.