Alert archive / Arizona / Special Weather Statements in 2018

Special Weather Statement, NWS Flagstaff, AZ

August 9, 2018

NWS Flagstaff, AZ issued this special weather statement at Aug 9, 2018, 2:03 PM MST. It was in force for 27 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 9, 2018, 2:03 PM MST (21:03 UTC)
Expired: Aug 9, 2018, 2:30 PM MST
In force: 27 min
Issued by: NWS Flagstaff, AZ

The radar

The Flagstaff radar (KFSX), 71 km from the middle of the area, began a volume at 21:05 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, 9.1 hours before the alert went out and 27 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: 399 J/kg
Mixed-layer CIN: -248 J/kg
Mixed-layer LCL: 1615 m above ground
0-6 km bulk shear: 12 kt
0-1 km storm-relative helicity: 130 m²/s²
0-3 km storm-relative helicity: 172 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.4

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 9, 9:29 AM MST, 4 hours 34 minutes earlier.

Area forecast discussion, Aug 9, 9:29 AM MST, 4 hours 34 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.
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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, Aug 9, 11:03 AM MST, 3 hours before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE FLAGSTAFF AZ
1103 AM MST THU AUG 9 2018

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

0648 PM     TSTM WND GST     HUMBUG CREEK            34.11N 112.30W
08/08/2018  M75 MPH          YAVAPAI            AZ   MESONET

            MESONET STATION QHBA3, HUMBUG CREEK.

&&

41

Local storm report, Aug 9, 11:05 AM MST, 2 hours 58 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE FLAGSTAFF AZ
1105 AM MST THU AUG 9 2018

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

0553 PM     TSTM WND GST     SUNSET POINT            34.19N 112.13W
08/08/2018  M56 MPH          YAVAPAI            AZ   MESONET

            MESONET STATION QSPA3, SUNSET POINT.

&&

41

Local storm report, Aug 9, 11:06 AM MST, 2 hours 57 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE FLAGSTAFF AZ
1106 AM MST THU AUG 9 2018

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

0802 PM     TSTM WND GST     GRAND CANYON AIRPORT    35.95N 112.15W
08/08/2018  M52 MPH          COCONINO           AZ   ASOS

            ASOS STATION GCN, GRAND CANYON AIRPORT.

&&

41

Local storm report, Aug 9, 1:10 PM MST, 53 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE FLAGSTAFF AZ
110 PM MST THU AUG 9 2018

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

0145 AM     LIGHTNING        COTTONWOOD              34.74N 112.02W
08/09/2018                   YAVAPAI            AZ   BROADCAST MEDIA

            HOUSE CAUGHT FIRE DUE TO LIGHTNING STRIKE.
            NO INJURIES.

&&

41

Special weather statement, Aug 9, 2:03 PM MST, 0 minutes before

Special Weather Statement
National Weather Service Flagstaff AZ
203 PM MST THU AUG 9 2018

AZZ015-092130-
Western Mogollon Rim-
203 PM MST THU AUG 9 2018

...SIGNIFICANT WEATHER ADVISORY FOR COCONINO COUNTY UNTIL 230 PM
MST...

At 202 PM MST, Doppler radar was tracking a strong thunderstorm over
Walnut Canyon National Monument, or near Flagstaff, moving south at
10 mph.

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

Locations impacted include...
Cosnino, Mountainaire, Walnut Canyon National Monument, Upper Lake
Mary, Upper Lake Mary Boat Ramps, Walnut Canyon Visitors Center,
Pinegrove Campground, Lower Lake Mary, Canyon Vista Campground, Lake
View Campground and Ashurst Lake Campgrounds.

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 3524 11153 3523 11144 3501 11140 3506 11169
TIME...MOT...LOC 2102Z 010DEG 11KT 3518 11150

RR

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 8, 5:43 PM MST	Severe Thunderstorm Warning	FGZ	Gila	47 min
Aug 8, 6:28 PM MST	Areal Flood Advisory	FGZ	Gila	3 hr
Aug 9, 2:39 PM MST	Severe Thunderstorm Warning	FGZ	Coconino	51 min
Aug 9, 2:58 PM MST	Severe Thunderstorm Warning	FGZ	Coconino	32 min
Aug 9, 3:03 PM MST	Areal Flood Advisory	FGZ	Coconino	111 min
Aug 9, 3:08 PM MST	Severe Thunderstorm Warning	FGZ	Coconino, Yavapai	52 min
Aug 9, 3:31 PM MST	Severe Thunderstorm Warning	FGZ	Coconino, Yavapai	29 min
Aug 9, 3:33 PM MST	Severe Thunderstorm Warning	FGZ	Navajo	30 min
Aug 9, 3:41 PM MST	Severe Thunderstorm Warning	FGZ	Coconino, Yavapai	49 min
Aug 9, 4:03 PM MST	Severe Thunderstorm Warning	FGZ	Coconino	57 min
Aug 9, 4:08 PM MST	Severe Thunderstorm Warning	FGZ	Coconino, Yavapai	67 min
Aug 9, 4:24 PM MST	Areal Flood Advisory	FGZ	Coconino, Yavapai	3 hr
Aug 9, 4:41 PM MST	Flash Flood Warning	FGZ	Gila	3 hr
Aug 9, 4:42 PM MST	Severe Thunderstorm Warning	FGZ	Yavapai	48 min
Aug 9, 4:58 PM MST	Severe Thunderstorm Warning	FGZ	Coconino, Yavapai	47 min

Nearby

Special Weather Statements in Arizona, 2018 Every special weather statement in 2018

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.