Alert archive / Arizona / Severe Thunderstorm Warnings in 2022

Severe Thunderstorm Warning 91, NWS Flagstaff, AZ

September 12, 2022Coconino County, Gila County, Yavapai County, Arizona

NWS Flagstaff, AZ issued this severe thunderstorm warning at Sep 12, 2022, 11:42 PM MST for Coconino County, Gila County, Yavapai County, Arizona. It was in force for 48 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Sep 12, 2022, 11:42 PM MST (06:42 UTC)
Expired: Sep 13, 2022, 12:30 AM MST
In force: 48 min
Issued by: NWS Flagstaff, AZ
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Coconino County, AZ, Gila County, AZ, Yavapai County, AZ

The radar

The Flagstaff radar (KFSX), 51 km from the middle of the area, began a volume at 06:44 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

Flgstf/Belemont, AZ (KFGZ), launched 00:00Z, 6.7 hours before the alert went out and 54 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: 75 J/kg
Mixed-layer CIN: -18 J/kg
Mixed-layer LCL: 3550 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 47 m²/s²
0-3 km storm-relative helicity: 81 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.4

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm warning 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 severe thunderstorm warning went out at Sep 12, 9:06 PM MST, 2 hours 36 minutes earlier.

Area forecast discussion, Sep 12, 9:06 PM MST, 2 hours 36 minutes before

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In the hours before

Local storm report, Sep 12, 5:59 PM MST, 5 hours 43 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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The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 12, 5:47 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Coconino, Yavapai	3 hr
Sep 13, 1:31 AM MST	Special Weather Statement	FGZ		29 min
Sep 13, 9:53 AM MST	Special Weather Statement	FGZ	Yavapai	37 min
Sep 13, 10:27 AM MST	Severe Thunderstorm Warning	FGZ	Yavapai	33 min
Sep 13, 11:06 AM MST	Areal Flood Advisory	FGZ	Yavapai	4 hr
Sep 13, 11:14 AM MST	Special Weather Statement	FGZ	Navajo	31 min
Sep 13, 11:36 AM MST	Severe Thunderstorm Warning	FGZ	Navajo	24 min
Sep 13, 11:57 AM MST	Special Weather Statement	FGZ		33 min
Sep 13, 12:24 PM MST	Special Weather Statement	FGZ	Yavapai	36 min
Sep 13, 1:02 PM MST	Severe Thunderstorm Warning	FGZ	Navajo	28 min
Sep 13, 1:49 PM MST	Special Weather Statement	FGZ		26 min
Sep 13, 1:55 PM MST	Severe Thunderstorm Warning	FGZ	Coconino	35 min
Sep 13, 2:19 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Coconino	3 hr
Sep 13, 2:50 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Coconino	4 hr
Sep 13, 3:19 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Yavapai	3 hr

Nearby

Severe Thunderstorm Warnings in Arizona, 2022 Every severe thunderstorm warning in 2022

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.