Alert archive / Arizona / Special Weather Statements in 2021

Special Weather Statement, NWS Flagstaff, AZ

July 19, 2021

NWS Flagstaff, AZ issued this special weather statement at Jul 19, 2021, 1:54 PM MST. 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 19, 2021, 1:54 PM MST (20:54 UTC)
Expired: Jul 19, 2021, 2:45 PM MST
In force: 51 min
Issued by: NWS Flagstaff, AZ

The radar

The Flagstaff radar (KFSX), 121 km from the middle of the area, began a volume at 20:52 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 12:00Z, 8.9 hours before the alert went out and 35 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: 96 J/kg
Mixed-layer CIN: -89 J/kg
Mixed-layer LCL: 1290 m above ground
0-6 km bulk shear: 12 kt
0-1 km storm-relative helicity: -2 m²/s²
0-3 km storm-relative helicity: 68 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 19, 8:58 AM MST, 4 hours 56 minutes earlier.

Area forecast discussion, Jul 19, 8:58 AM MST, 4 hours 56 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>
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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

Special weather statement, Jul 19, 1:54 PM MST, 0 minutes before

Special Weather Statement
National Weather Service Flagstaff AZ
154 PM MST Mon Jul 19 2021

AZZ007-015-192145-
Western Mogollon Rim-Coconino Plateau-
154 PM MST Mon Jul 19 2021

...SIGNIFICANT WEATHER ADVISORY FOR THE WILLIAMS AREA IN COCONINO
COUNTY UNTIL 245 PM MST...

At 153 PM MST, Doppler radar was tracking a strong thunderstorm over
Williams, or 32 miles west of Flagstaff, moving northwest at 5 mph.

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

Locations impacted include...
Williams and Kaibab Lake Campground.

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.

&&

LAT...LON 3529 11203 3518 11219 3532 11243 3550 11218
TIME...MOT...LOC 2053Z 137DEG 5KT 3530 11218

JJ

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 18, 5:31 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Gila	59 min
Jul 18, 5:43 PM MST	Severe Thunderstorm Warning	FGZ	Gila, Yavapai	24 min
Jul 18, 6:14 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Yavapai	3 hr
Jul 18, 6:21 PM MST	Special Weather Statement	FGZ		24 min
Jul 19, 1:48 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Yavapai	3 hr
Jul 19, 2:08 PM MST	Severe Thunderstorm Warning	FGZ	Coconino	37 min
Jul 19, 2:30 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Coconino	2 hr
Jul 19, 3:07 PM MST	Special Weather Statement	FGZ		23 min
Jul 19, 3:28 PM MST	Special Weather Statement	FGZ		32 min
Jul 19, 3:37 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Coconino	3 hr
Jul 19, 4:01 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Navajo	3 hr
Jul 19, 4:27 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Yavapai	2 hr

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.