Alert archive / Arizona / Flash Flood Warnings in 2024

Flash Flood Warning 40, NWS Flagstaff, AZ

July 21, 2024Yavapai County, Arizona

NWS Flagstaff, AZ issued this flash flood warning at Jul 21, 2024, 3:19 PM MST for Yavapai 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
Jul 21, 2024, 3:19 PM MST (22:19 UTC)
Expired
Jul 21, 2024, 6:30 PM MST
In force
3 hr
Issued by
NWS Flagstaff, AZ
Area
Storm-based polygon
Damage threat
Considerable
Flood severity
None

County Yavapai County, AZ

The radar

The Flagstaff radar (KFSX), 124 km from the middle of the area, began a volume at 22:20 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, 10.3 hours before the alert went out and 98 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 2024-07-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 227 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 2024-07-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 53 square meters per square second.193958Sfc1 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
227 J/kg
Mixed-layer CIN
-144 J/kg
Mixed-layer LCL
1703 m above ground
0-6 km bulk shear
30 kt
0-1 km storm-relative helicity
53 m²/s²
0-3 km storm-relative helicity
55 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

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 Jul 21, 2:32 PM MST, 47 minutes earlier.

Area forecast discussion, Jul 21, 2:32 PM MST, 47 minutes before
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In the hours before

Special weather statement, Jul 21, 11:35 AM MST, 3 hours 44 minutes before
Special Weather Statement
National Weather Service Flagstaff AZ
1135 AM MST Sun Jul 21 2024

AZZ015-038-211900-
Western Mogollon Rim-Oak Creek and Sycamore Canyons-
1135 AM MST Sun Jul 21 2024

...A STRONG THUNDERSTORM WILL IMPACT COCONINO COUNTY THROUGH NOON
MST...

At 1135 AM MST, Doppler radar was tracking a strong thunderstorm over
Munds Park, or 10 miles northeast of Sedona, moving southeast at 20
mph.

HAZARD...Wind gusts up to 40 mph and pea 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...
Munds Park, Indian Gardens, Pine Flats, East Pocket Lookout Tower,
Schnebly Hill Overlook, Slide Rock State Park, West Fork of Oak
Creek, and Red Rock-Secret Mountain Wilderness.

This includes the following highways...
 Interstate 17 between mile markers 321 and 330.
 State Route 89A between mile markers 377 and 387.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 3499 11178 3505 11169 3496 11157 3487 11172
TIME...MOT...LOC 1835Z 328DEG 17KT 3496 11168

MAX HAIL SIZE...0.25 IN
MAX WIND GUST...40 MPH

Konieczny
Special weather statement, Jul 21, 12:09 PM MST, 3 hours 10 minutes before
Special Weather Statement
National Weather Service Flagstaff AZ
1209 PM MST Sun Jul 21 2024

AZZ016-018-211945-
Northern Gila County-Eastern Mogollon Rim-
1209 PM MST Sun Jul 21 2024

...A STRONG THUNDERSTORM WILL IMPACT GILA...NAVAJO AND COCONINO
COUNTIES BETWEEN KOHLS RANCH AND FOREST LAKES THROUGH 1245 PM MST...

At 1209 PM MST, Doppler radar was tracking a strong thunderstorm over
Hunter Creek, or 10 miles west of Forest Lakes, moving southeast at
20 mph.

HAZARD...Wind gusts up to 40 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...
Bear Flat, Haigler Creek, Young, Mountain Meadows, Willow Springs
Canyon Lake, Christopher Creek, Woods Canyon Lake, Woods Canyon Lake
Recreation Area, Colcord Mountain Estates, Mogollon Rim Visitor
Center, Willow Springs Lake Recreation Area, Hunter Creek, Canyon
Creek Fish Hatchery, Sleepy Hollow, Sardine Point Day Use, Forest
Lakes, and Hellsgate Wilderness.

This includes the following highways...
 State Route 288 between mile markers 301 and 311.
 State Route 260 between mile markers 271 and 286.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

&&

LAT...LON 3427 11114 3440 11093 3421 11068 3403 11097
TIME...MOT...LOC 1909Z 323DEG 17KT 3429 11097

MAX HAIL SIZE...0.75 IN
MAX WIND GUST...40 MPH

MCT
Local storm report, Jul 21, 12:33 PM MST, 2 hours 46 minutes before
Preliminary Local Storm Report
National Weather Service Flagstaff AZ
1233 PM MST Sun Jul 21 2024

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

1231 PM     Tstm Wnd Dmg     1 E Pine                34.38N 111.45W
07/21/2024                   Gila               AZ   Trained Spotter

            Phone call received for trees down
            (approximately a foot in diameter) along HWY
            87.

&&

PTK
Special weather statement, Jul 21, 2:04 PM MST, 1 hour 15 minutes before
Special Weather Statement
National Weather Service Flagstaff AZ
204 PM MST Sun Jul 21 2024

AZZ008-037-212130-
Yavapai County Valleys and Basins-Yavapai County Mountains-
204 PM MST Sun Jul 21 2024

...A STRONG THUNDERSTORM WILL IMPACT YAVAPAI COUNTY FROM
PAULDEN THROUGH PRESCOTT AND DEWEY HUMBOLDT THROUGH 230 PM MST...

At 203 PM MST, Doppler radar was tracking a strong thunderstorm near
Yavapai County Fairgrounds, or near Prescott Valley, moving south at
25 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...
Quartz Mountain, Thumbe Butte, Rancho Vista Estates, Willow Creek
Reservoir, Poland Junction, Prescott Gateway Mall, Iron Springs,
Embry-Riddle Aeronautical University, Acker Park, Chino Valley,
Prescott Valley, Woodchute Mountain, Goldwater Lake Park, Wildwood
Estates, Fain Lake, Mingus Mountain, Alto Pit OHV, Courthouse Plaza,
Wilhoit, and Prescott Regional Airport.

This includes the following highways...
 State Route 89 between mile markers 293 and 342.
 State Route 89A between mile markers 318 and 342.
 State Route 69 between mile markers 274 and 296.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

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.

A Severe Thunderstorm Watch remains in effect until 800 PM MST for
west central Arizona.

&&

LAT...LON 3493 11265 3497 11219 3445 11205 3439 11262
TIME...MOT...LOC 2103Z 350DEG 35KT 3469 11232

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

MCT
Local storm report, Jul 21, 3:13 PM MST, 6 minutes before
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Local storm report, Jul 21, 3:17 PM MST, 2 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Jul 20, 5:35 PM MSTSevere Thunderstorm WarningFGZGila, Yavapai25 min
Jul 21, 11:24 AM MSTSpecial Weather StatementFGZGila36 min
Jul 21, 11:35 AM MSTSpecial Weather StatementFGZ25 min
Jul 21, 12:09 PM MSTSpecial Weather StatementFGZGila36 min
Jul 21, 12:13 PM MSTSevere Thunderstorm WarningFGZCoconino, Gila19 min
Jul 21, 12:20 PM MSTSevere Thunderstorm WarningFGZCoconino, Gila25 min
Jul 21, 12:43 PM MSTSevere Thunderstorm WarningFGZCoconino, Gila32 min
Jul 21, 1:02 PM MSTSevere Thunderstorm WarningFGZGila, Navajo28 min
Jul 21, 1:22 PM MSTSevere Thunderstorm WarningFGZYavapai23 min
Jul 21, 1:27 PM MSTSevere Thunderstorm WarningFGZGila33 min
Jul 21, 1:44 PM MSTSevere Thunderstorm WarningFGZGila, Yavapai46 min
Jul 21, 2:04 PM MSTSpecial Weather StatementFGZYavapai26 min
Jul 21, 2:13 PM MSTFlash Flood Warning Considerable damage threatFGZYavapai4 hr
Jul 21, 2:35 PM MSTSevere Thunderstorm WarningFGZYavapai25 min
Jul 21, 3:02 PM MSTSevere Thunderstorm WarningFGZYavapai43 min
Jul 21, 3:52 PM MSTSpecial Weather StatementFGZ38 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.