Alert archive / Arizona / Flash Flood Warnings in 2022

Flash Flood Warning 56, NWS Flagstaff, AZ

July 24, 2022Coconino County, Arizona

NWS Flagstaff, AZ issued this flash flood warning at Jul 24, 2022, 3:00 PM MST for Coconino 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 24, 2022, 3:00 PM MST (22:00 UTC)
Expired: Jul 24, 2022, 5:47 PM MST
In force: 3 hr
Issued by: NWS Flagstaff, AZ
Area: Storm-based polygon
Damage threat: Considerable
Flood severity: None

County Coconino County, AZ

The radar

The Flagstaff radar (KFSX), 150 km from the middle of the area, began a volume at 22:00 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

Phoenix, AZ (KPSR), launched 12:00Z, 10.0 hours before the alert went out and 268 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: 437 J/kg
Mixed-layer CIN: -178 J/kg
Mixed-layer LCL: 1851 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 34 m²/s²
0-3 km storm-relative helicity: 3 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

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 Jul 24, 3:00 PM MST, 0 minutes earlier.

Area forecast discussion, Jul 24, 3:00 PM MST, 0 minutes before

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In the hours before

Special weather statement, Jul 24, 1:45 PM MST, 1 hour 15 minutes before

Special Weather Statement
National Weather Service Flagstaff AZ
145 PM MST Sun Jul 24 2022

AZZ013-242100-
Little Colorado River Valley in Navajo County-
145 PM MST Sun Jul 24 2022

...A strong thunderstorm will impact portions of Navajo County
through 200 PM MST...

At 144 PM MST, Doppler radar was tracking a strong thunderstorm 7
miles southwest of Woodruff moving north at 25 mph.

HAZARD...Winds in excess of 40 mph and half inch hail.

SOURCE...Radar indicated.

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

Locations impacted include...
Woodruff.

This includes the following highways...
 State Route 277 between mile markers 327 and 331.
 State Route 377 between mile markers 16 and 30.
 State Route 77 between mile markers 364 and 383.
 Highway 180 between mile markers 315 and 320.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 3462 10990 3448 11024 3476 11041 3489 10995
TIME...MOT...LOC 2044Z 163DEG 20KT 3469 11012

MAX HAIL SIZE...0.50 IN
MAX WIND GUST...40 MPH

ET

Local storm report, Jul 24, 2:44 PM MST, 16 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 23, 5:19 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Coconino, Yavapai	5 hr
Jul 23, 5:20 PM MST	Special Weather Statement	FGZ	Apache	40 min
Jul 23, 5:35 PM MST	Special Weather Statement	FGZ		40 min
Jul 23, 5:49 PM MST	Areal Flood Advisory	FGZ	Apache, Navajo	3 hr
Jul 23, 6:25 PM MST	Special Weather Statement	FGZ	Yavapai	35 min
Jul 23, 6:44 PM MST	Areal Flood Advisory	FGZ	Yavapai	3 hr
Jul 23, 7:20 PM MST	Special Weather Statement	FGZ	Yavapai	40 min
Jul 24, 1:09 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Apache	3 hr
Jul 24, 1:45 PM MST	Special Weather Statement	FGZ		15 min
Jul 24, 2:14 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Navajo	4 hr
Jul 24, 3:13 PM MST	Severe Thunderstorm Warning	FGZ	Coconino	32 min
Jul 24, 3:34 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Coconino	2 hr
Jul 24, 4:56 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Coconino	3 hr

Nearby

Flash Flood Warnings in Arizona, 2022 Every flash flood warning in 2022

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.