Alert archive / Arizona / Special Weather Statements in 2021

Special Weather Statement, NWS Flagstaff, AZ

July 30, 2021

NWS Flagstaff, AZ issued this special weather statement at Jul 30, 2021, 2:01 PM MST. It was in force for 29 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 30, 2021, 2:01 PM MST (21:01 UTC)
Expired: Jul 30, 2021, 2:30 PM MST
In force: 29 min
Issued by: NWS Flagstaff, AZ

The nearest sounding before it

Albuquerq/Krtlnd, NM (KABQ), launched 12:00Z, 9.0 hours before the alert went out and 306 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: 66 J/kg
Mixed-layer CIN: -58 J/kg
Mixed-layer LCL: 1636 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: -44 m²/s²
0-3 km storm-relative helicity: 71 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 30, 9:31 AM MST, 4 hours 30 minutes earlier.

Area forecast discussion, Jul 30, 9:31 AM MST, 4 hours 30 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

Local storm report, Jul 30, 12:29 PM MST, 1 hour 32 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE FLAGSTAFF AZ
1229 PM MST FRI JUL 30 2021

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1220 PM     HAIL             1 ESE DOWNTOWN FLAGSTAF 35.19N 111.63W
07/30/2021  E0.70 INCH       COCONINO           AZ   TRAINED SPOTTER

            MARBLE SIZED HAIL.

&&

BEP

Local storm report, Jul 30, 12:36 PM MST, 1 hour 25 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE FLAGSTAFF AZ
1236 PM MST FRI JUL 30 2021

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0300 PM     FLOOD            1 ESE MOENKOPI          36.10N 111.20W
07/29/2021                   COCONINO           AZ   OTHER FEDERAL

            9.7 FOOT RISE ON THE MOENKOPI GAGE -
            STARTING AT 3 PM MST ON 7/29/21 AND PEAKING
            AT 445 AM MST ON 7/30/21.

&&

BEP

Special weather statement, Jul 30, 2:01 PM MST, 0 minutes before

Special Weather Statement
National Weather Service Flagstaff AZ
301 PM MDT Fri Jul 30 2021

AZZ010-302130-
Chinle Valley-
301 PM MDT Fri Jul 30 2021

...SIGNIFICANT WEATHER ADVISORY FOR APACHE COUNTY UNTIL 330 PM MDT...

At 300 PM MDT, Doppler radar was tracking a strong thunderstorm 7
miles southwest of Round Rock, or 19 miles north of Chinle, moving
northwest at 15 mph.

Half inch hail and winds in excess of 40 mph will be possible with
this storm.

Locations impacted include...
Round Rock, Many Farms Lake and Many Farms.

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 3640 10941 3632 10960 3645 10977 3658 10946
TIME...MOT...LOC 2100Z 153DEG 13KT 3643 10955

ET

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 29, 5:05 PM MST	Special Weather Statement	FGZ	Coconino	40 min
Jul 29, 5:35 PM MST	Special Weather Statement	FGZ		25 min
Jul 29, 5:38 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Yavapai	112 min
Jul 29, 6:45 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Yavapai	3 hr
Jul 29, 6:56 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Coconino	3 hr
Jul 29, 8:12 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Gila	5 hr
Jul 30, 5:58 AM MST	Areal Flood Warning	FGZ	Coconino	5 hr
Jul 30, 11:34 AM MST	Areal Flood Advisory	FGZ	Navajo	2 hr
Jul 30, 12:44 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Coconino	2 hr
Jul 30, 1:15 PM MST	Areal Flood Advisory	FGZ	Coconino	3 hr
Jul 30, 1:47 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Yavapai	3 hr
Jul 30, 2:18 PM MST	Severe Thunderstorm Warning	FGZ	Coconino	27 min
Jul 30, 4:09 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Coconino, Gila	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.