Alert archive / Arizona / Special Weather Statements in 2021

Special Weather Statement, NWS Flagstaff, AZ

July 10, 2021Yavapai County, Arizona

NWS Flagstaff, AZ issued this special weather statement at Jul 10, 2021, 2:55 PM MST for Yavapai County, Arizona. It was in force for 50 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 10, 2021, 2:55 PM MST (21:55 UTC)
Expired: Jul 10, 2021, 3:45 PM MST
In force: 50 min
Issued by: NWS Flagstaff, AZ

County Yavapai County, AZ

The radar

The Flagstaff radar (KFSX), 124 km from the middle of the area, began a volume at 21:54 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, 9.9 hours before the alert went out and 89 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: 110 J/kg
Mixed-layer CIN: -242 J/kg
Mixed-layer LCL: 2626 m above ground
0-6 km bulk shear: 14 kt
0-1 km storm-relative helicity: 37 m²/s²
0-3 km storm-relative helicity: 131 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 10, 10:18 AM MST, 4 hours 37 minutes earlier.

Area forecast discussion, Jul 10, 10:18 AM MST, 4 hours 37 minutes before

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<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 10, 12:36 PM MST, 2 hours 19 minutes before

Special Weather Statement
National Weather Service Flagstaff AZ
136 PM MDT Sat Jul 10 2021

AZZ011-040-102000-
Chuska Mountains and Defiance Plateau-
Northeast Plateaus and Mesas South of Hwy 264-
136 PM MDT Sat Jul 10 2021

...SIGNIFICANT WEATHER ADVISORY FOR A STRONG THUNDERSTORM OVER
APACHE COUNTY AND THE NAVAJO NATION UNTIL 200 PM MDT...

At 134 PM MDT, Doppler radar was tracking a strong thunderstorm over
Wide Ruins moving south at 20 mph.

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

Locations impacted include...
Wide Ruins and parts of US Hwy 191 between Wide Ruins and Chambers.

LAT...LON 3551 10957 3550 10939 3530 10935 3533 10966
TIME...MOT...LOC 1934Z 004DEG 17KT 3543 10948

NL

Local storm report, Jul 10, 1:12 PM MST, 1 hour 43 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE FLAGSTAFF AZ
112 PM MST SAT JUL 10 2021

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

0707 PM     HAIL             1 NW HEBER-OVERGAARD    34.43N 110.58W
07/09/2021  M1.00 INCH       NAVAJO             AZ   PUBLIC

&&

Special weather statement, Jul 10, 1:57 PM MST, 58 minutes before

Special Weather Statement
National Weather Service Flagstaff AZ
157 PM MST Sat Jul 10 2021

AZZ018-102130-
Northern Gila County-
157 PM MST Sat Jul 10 2021

...SIGNIFICANT WEATHER ADVISORY FOR A STRONG THUNDERSTORM IN GILA
COUNTY INCLUDING AREAS NEAR CANYON DAY UNTIL 230 PM MST...

At 156 PM MST, Doppler radar was tracking a strong thunderstorm near
Fort Apache and Canyon Day, or 32 miles south of Show Low, moving
west at 15 mph.

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

Locations impacted include...
Whiteriver, Fort Apache Reservation and Canyon Day.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 3380 11029 3386 11000 3367 11000 3364 11009
TIME...MOT...LOC 2056Z 077DEG 11KT 3377 11005

NL

Special weather statement, Jul 10, 2:55 PM MST, 0 minutes before

Special Weather Statement
National Weather Service Flagstaff AZ
255 PM MST Sat Jul 10 2021

AZZ008-037-102245-
Yavapai County Valleys and Basins-Yavapai County  Mountains-
255 PM MST Sat Jul 10 2021

...SIGNIFICANT WEATHER ADVISORY FOR STRONG THUNDERSTORMS IN YAVAPAI
COUNTY UNTIL 345 PM MST...

At 254 PM MST, Doppler radar was tracking strong thunderstorms along
a line extending from 6 miles west of Paulden to near Yavapai County
Fairgrounds. Movement was west at 15 mph.

Half inch hail and wind gusts up to 50 mph will be possible with
these storms.

Locations impacted include...
Chino Valley, Prescott Valley, Prescott, Prescott Airport, Williamson
Valley, Prescott Gateway Mall, Iron Springs, Yavapai Campground,
Downtown Prescott, Ponderosa Park, Indian Hill West Prescott, Oak
Knoll Village, Lynx Lake Dam, Prescott Valley Event Center and White
Spar Campground.

LAT...LON 3482 11278 3445 11247 3461 11225 3470 11241
      3486 11256
TIME...MOT...LOC 2154Z 068DEG 15KT 3487 11258 3460 11232

NL

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 9, 5:00 PM MST	Severe Thunderstorm Warning	FGZ	Yavapai	45 min
Jul 9, 5:11 PM MST	Special Weather Statement	FGZ		34 min
Jul 9, 5:21 PM MST	Special Weather Statement	FGZ	Yavapai	39 min
Jul 9, 5:32 PM MST	Severe Thunderstorm Warning	FGZ	Navajo	43 min
Jul 9, 5:40 PM MST	Severe Thunderstorm Warning	FGZ	Yavapai	35 min
Jul 9, 6:14 PM MST	Severe Thunderstorm Warning	FGZ	Navajo	46 min
Jul 9, 7:14 PM MST	Special Weather Statement	FGZ	Gila	46 min
Jul 10, 12:36 PM MST	Special Weather Statement	FGZ	Apache	24 min
Jul 10, 1:29 PM MST	Areal Flood Advisory	FGZ	Apache	2 hr
Jul 10, 1:38 PM MST	Severe Thunderstorm Warning	FGZ	Coconino, Yavapai	31 min
Jul 10, 1:57 PM MST	Special Weather Statement	FGZ		33 min
Jul 10, 2:21 PM MST	Severe Thunderstorm Warning	FGZ	Yavapai	39 min
Jul 10, 2:40 PM MST	Areal Flood Advisory	FGZ	Gila	4 hr
Jul 10, 3:40 PM MST	Areal Flood Advisory	FGZ	Yavapai	3 hr
Jul 10, 4:18 PM MST	Severe Thunderstorm Warning	FGZ	Gila	27 min
Jul 10, 4:27 PM MST	Severe Thunderstorm Warning	FGZ	Apache, Navajo	48 min
Jul 10, 4:40 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Gila	3 hr
Jul 10, 4:40 PM MST	Severe Thunderstorm Warning	FGZ	Gila, Navajo	50 min
Jul 10, 4:51 PM MST	Severe Thunderstorm Warning	FGZ	Coconino, Yavapai	24 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.