Alert archive / Arizona / Special Weather Statements in 2019

Special Weather Statement, NWS Flagstaff, AZ

August 3, 2019

NWS Flagstaff, AZ issued this special weather statement at Aug 3, 2019, 1:14 PM MST. It was in force for 46 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 3, 2019, 1:14 PM MST (20:14 UTC)
Expired: Aug 3, 2019, 2:00 PM MST
In force: 46 min
Issued by: NWS Flagstaff, AZ

The radar

The Flagstaff radar (KFSX), 122 km from the middle of the area, began a volume at 20:17 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, 8.2 hours before the alert went out and 214 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: 206 J/kg
Mixed-layer CIN: -376 J/kg
Mixed-layer LCL: 2943 m above ground
0-6 km bulk shear: 14 kt
0-1 km storm-relative helicity: 38 m²/s²
0-3 km storm-relative helicity: 33 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 Aug 3, 9:46 AM MST, 3 hours 28 minutes earlier.

Area forecast discussion, Aug 3, 9:46 AM MST, 3 hours 28 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, Aug 3, 12:11 PM MST, 1 hour 3 minutes before

Special Weather Statement
National Weather Service Flagstaff AZ
111 PM MDT Sat Aug 3 2019

AZZ011-032000-
Chuska Mountains and Defiance Plateau-
111 PM MDT Sat Aug 3 2019

...SIGNIFICANT WEATHER ADVISORY FOR APACHE COUNTY UNTIL 200 PM MDT...

At 109 PM MDT, Doppler radar was tracking a cluster of strong
thunderstorms 10 miles southeast of Kinlichee Chapter House, or 32
miles west of Gallup, moving northeast at 15 mph.

Pea size hail and winds in excess of 30 mph will be possible with
this storm.

Locations impacted include...
Fort Defiance, Window Rock, St. Michaels and Sawmill.

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.

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 3548 10907 3560 10941 3595 10925 3585 10904
      3556 10905
TIME...MOT...LOC 1909Z 211DEG 12KT 3568 10927

JDS

Special weather statement, Aug 3, 1:14 PM MST, 0 minutes before

Special Weather Statement
National Weather Service Flagstaff AZ
114 PM MST Sat Aug 3 2019

AZZ013-014-016-017-032100-
Little Colorado River Valley in Navajo County-Little Colorado River
Valley in Apache County-White Mountains-Eastern Mogollon Rim-
114 PM MST Sat Aug 3 2019

...SIGNIFICANT WEATHER ADVISORY FOR APACHE AND NAVAJO COUNTIES UNTIL
200 PM MST...

At 114 PM MST, Doppler radar was tracking a strong thunderstorm 8
miles east of Show Low, moving north at 15 mph.

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

Locations impacted include...
White Mountain Lake.

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.

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 3424 10981 3421 10999 3443 11005 3444 10988
TIME...MOT...LOC 2014Z 164DEG 11KT 3431 10992

JDS

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 2, 5:25 PM MST	Flash Flood Warning	FGZ	Yavapai	3 hr
Aug 2, 6:07 PM MST	Special Weather Statement	FGZ		38 min
Aug 2, 6:12 PM MST	Flash Flood Warning	FGZ	Yavapai	3 hr
Aug 2, 6:27 PM MST	Severe Thunderstorm Warning	FGZ	Yavapai	37 min
Aug 2, 7:02 PM MST	Special Weather Statement	FGZ	Yavapai	28 min
Aug 2, 7:09 PM MST	Flash Flood Warning	FGZ	Coconino	3 hr
Aug 3, 12:11 PM MST	Special Weather Statement	FGZ	Apache	49 min
Aug 3, 1:28 PM MST	Flash Flood Warning	FGZ	Yavapai	3 hr
Aug 3, 1:55 PM MST	Special Weather Statement	FGZ		50 min
Aug 3, 2:14 PM MST	Special Weather Statement	FGZ		46 min
Aug 3, 2:30 PM MST	Severe Thunderstorm Warning	FGZ	Yavapai	45 min
Aug 3, 3:25 PM MST	Severe Thunderstorm Warning	FGZ	Yavapai	35 min
Aug 3, 4:19 PM MST	Flash Flood Warning	FGZ	Gila	3 hr
Aug 3, 4:29 PM MST	Flash Flood Warning	FGZ	Gila	3 hr

Nearby

Special Weather Statements in Arizona, 2019 Every special weather statement in 2019

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.