Alert archive / Arizona / Flash Flood Warnings in 2024

Flash Flood Warning 20, NWS Flagstaff, AZ

June 27, 2024Navajo County, Arizona

NWS Flagstaff, AZ issued this flash flood warning at Jun 27, 2024, 5:21 PM MDT for Navajo County, Arizona. It was in force for 3 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Jun 27, 2024, 5:21 PM MDT (23:21 UTC)
Expired
Jun 27, 2024, 8:15 PM MDT
In force
3 hr
Issued by
NWS Flagstaff, AZ
Area
Storm-based polygon
Damage threat
Considerable
Flood severity
None

County Navajo County, AZ

The radar

The Flagstaff radar (KFSX), 122 km from the middle of the area, began a volume at 23:21 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, 11.4 hours before the alert went out and 136 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-pSkew-T log-p diagram, Flgstf/Belemont, AZ at 12:00Z on 2024-06-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 765 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Flgstf/Belemont, AZ at 12:00Z on 2024-06-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 10 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
765 J/kg
Mixed-layer CIN
-76 J/kg
Mixed-layer LCL
1295 m above ground
0-6 km bulk shear
20 kt
0-1 km storm-relative helicity
10 m²/s²
0-3 km storm-relative helicity
44 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.3

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this flash flood warning 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 flash flood warning went out at Jun 27, 3:10 PM MDT, 2 hours 11 minutes earlier.

Area forecast discussion, Jun 27, 3:10 PM MDT, 2 hours 11 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>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>

In the hours before

Local storm report, Jun 27, 11:24 AM MDT, 5 hours 57 minutes before
Preliminary Local Storm Report
National Weather Service Flagstaff AZ
1024 AM MST Thu Jun 27 2024

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

0823 AM     Tstm Wnd Gst     1 WSW Winslow           35.02N 110.73W
06/27/2024  M62 MPH          Navajo             AZ   ASOS

            Thunderstorm wind gust at Winslow Airport
            (ASOS).

&&

BAK
Special weather statement, Jun 27, 12:01 PM MDT, 5 hours 20 minutes before
Special Weather Statement
National Weather Service Flagstaff AZ
1101 AM MST Thu Jun 27 2024

AZZ013-014-017-040-271845-
Little Colorado River Valley in Navajo County-
Little Colorado River Valley in Apache County-White Mountains-
Northeast Plateaus and Mesas South of Hwy 264-
1101 AM MST Thu Jun 27 2024

...STRONG THUNDERSTORMS WILL IMPACT SOUTHERN APACHE AND NAVAJO
COUNTIES THROUGH 1145 AM MST...

At 1100 AM MST, Doppler radar was tracking strong thunderstorms along
a line extending from near Woodruff to near Lyman Lake State Park.
Movement was northeast at 20 mph.

HAZARD...Wind gusts up to 50 mph and half inch hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor hail damage to vegetation is
         possible.

Locations impacted include...
Concho Lake, Lions Park, Woodruff, Zion Reservoir, Concho, St. Johns,
Saint Johns Industrial Air Park, White Mountain Ultralight
Flightpark, Little Ortega Lake, Hunt, St. Johns City Park, Rainbow
Forest Lodge, Mesa Redonda, Lyman Lake, Cerro Montoso Peak, Mesa
Parada, Petrified Forest National Park, Lyman Lake State Park,
Crystal Forest, and Snowflake.

This includes the following highways...
 Interstate 40 between mile markers 300 and 307.
 State Route 77 between mile markers 362 and 383.
 Highway 180 191 between mile markers 371 and 387.
 Highway 60 between mile markers 364 and 375.
 Highway 191 161 between mile markers 316 and 329.
 Highway 180 between mile markers 312 and 368.
 State Route 61 between mile markers 359 and 381.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

Torrential rainfall is also occurring with these storms and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

&&

LAT...LON 3419 10951 3466 11032 3506 10989 3456 10905
      3442 10905
TIME...MOT...LOC 1800Z 230DEG 19KT 3474 11010 3433 10942

MAX HAIL SIZE...0.50 IN
MAX WIND GUST...50 MPH

JJ
Special weather statement, Jun 27, 12:14 PM MDT, 5 hours 7 minutes before
Special Weather Statement
National Weather Service Flagstaff AZ
1114 AM MST Thu Jun 27 2024

AZZ011-271845-
Chuska Mountains and Defiance Plateau-
1114 AM MST Thu Jun 27 2024

...STRONG THUNDERSTORMS WILL IMPACT APACHE COUNTY NEAR FORT DEFIANCE
THROUGH 1145 AM MST...

At 1113 AM MST, Doppler radar was tracking a cluster of strong
thunderstorms over Fort Defiance, or 25 miles northwest of Gallup,
moving east at 30 mph.

HAZARD...Wind gusts up to 50 mph and penny size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor hail damage to vegetation is
         possible.

Locations impacted include...
Piney Hill, Window Rock Airport, St. Michaels, Window Rock, Fort
Defiance, Sawmill, and Hunters Point.

This includes State Route 264 between mile markers 459 and 475.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

Torrential rainfall is also occurring with this storm and may lead to
localized flooding. Do not drive your vehicle through flooded
roadways.

&&

LAT...LON 3553 10933 3595 10933 3596 10905 3557 10905
TIME...MOT...LOC 1813Z 269DEG 25KT 3575 10909

MAX HAIL SIZE...0.75 IN
MAX WIND GUST...50 MPH

JJ

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 26, 7:17 PM MDTSevere Thunderstorm WarningFGZCoconino28 min
Jun 27, 9:34 AM MDTSevere Thunderstorm WarningFGZNavajo26 min
Jun 27, 10:02 AM MDTSpecial Weather StatementFGZNavajo28 min
Jun 27, 10:32 AM MDTSpecial Weather StatementFGZNavajo28 min
Jun 27, 11:01 AM MDTSpecial Weather StatementFGZApache44 min
Jun 27, 11:18 AM MDTAreal Flood AdvisoryFGZNavajo117 min
Jun 27, 11:47 AM MDTSevere Thunderstorm WarningFGZCoconino43 min
Jun 27, 12:01 PM MDTSpecial Weather StatementFGZ44 min
Jun 27, 12:14 PM MDTSpecial Weather StatementFGZApache31 min
Jun 27, 12:32 PM MDTSevere Thunderstorm WarningFGZCoconino43 min
Jun 27, 12:41 PM MDTAreal Flood AdvisoryFGZApache109 min
Jun 27, 1:00 PM MDTAreal Flood AdvisoryFGZApache3 hr
Jun 27, 1:52 PM MDTFlash Flood Warning Considerable damage threatFGZCoconino3 hr
Jun 27, 2:09 PM MDTSevere Thunderstorm WarningFGZCoconino51 min
Jun 27, 2:43 PM MDTFlash Flood Warning Considerable damage threatFGZCoconino, Navajo3 hr
Jun 27, 3:00 PM MDTSevere Thunderstorm WarningFGZCoconino45 min
Jun 27, 3:22 PM MDTSevere Thunderstorm WarningFGZCoconino, Navajo23 min
Jun 27, 3:46 PM MDTFlash Flood Warning Considerable damage threatFGZCoconino2 hr
Jun 27, 4:12 PM MDTFlash Flood Warning Considerable damage threatFGZCoconino2 hr
Jun 27, 5:04 PM MDTSevere Thunderstorm WarningFGZApache, Navajo26 min

Nearby

Flash Flood Warnings in Arizona, 2024Every flash flood warning in 2024

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.