Alert archive / Arizona / Flash Flood Warnings in 2022

Flash Flood Warning 313, NWS Flagstaff, AZ

September 10, 2022Navajo County, Arizona

NWS Flagstaff, AZ issued this flash flood warning at Sep 10, 2022, 4:52 PM MDT for Navajo County, Arizona. It was in force for 2 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: Sep 10, 2022, 4:52 PM MDT (22:52 UTC)
Expired: Sep 10, 2022, 7:11 PM MDT
In force: 2 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 22:55 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, 10.9 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-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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 3192 m above ground
0-6 km bulk shear: 6 kt
0-1 km storm-relative helicity: -116 m²/s²
0-3 km storm-relative helicity: -153 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 Sep 10, 3:53 PM MDT, 59 minutes earlier.

Area forecast discussion, Sep 10, 3:53 PM MDT, 59 minutes before

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In the hours before

Local storm report, Sep 10, 12:25 PM MDT, 4 hours 27 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE FLAGSTAFF AZ
1125 AM MST SAT SEP 10 2022

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

1045 AM     FLASH FLOOD      SUPAI                   36.22N 112.69W
09/10/2022                   COCONINO           AZ   OTHER FEDERAL

            USGS STREAM GAUGE REPORTED A 1.83 FT. RISE
            AT 10:45 AM MST.

&&

PTS

Special weather statement, Sep 10, 12:27 PM MDT, 4 hours 25 minutes before

Special Weather Statement
National Weather Service Flagstaff AZ
1127 AM MST Sat Sep 10 2022

AZZ015-101900-
Western Mogollon Rim-
1127 AM MST Sat Sep 10 2022

...Strong thunderstorms will impact portions of the Flagstaff Metro
Area in Coconino County through NOON MST...

At 1126 AM MST, Doppler radar was tracking strong thunderstorms over
Flagstaff, moving northwest at 20 mph.

HAZARD...Winds in excess of 30 mph and heavy rainfall.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Localized flooding is possible.

Locations impacted include...
Flagstaff, Cosnino, Fort Valley, Flagstaff Mall, Walnut Canyon
National Monument, Downtown Flagstaff, Hutchison Acres, Walnut Canyon
Visitors Center, Little Elden Spring Horse Camp, Canyon Vista
Campground and Lower Lake Mary.

This includes the following highways...
 Route 66 between mile markers 192 and 204.
 Interstate 40 between mile markers 192 and 208.
 U.S. Highway 89 between mile markers 419 and 423.
 Highway 180 between mile markers 217 and 224.

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.

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 3521 11145 3514 11144 3509 11155 3523 11179
      3536 11165
TIME...MOT...LOC 1826Z 121DEG 18KT 3520 11160

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...30 MPH

EFL

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 10, 10:35 AM MDT	Flash Flood Warning Considerable damage threat	FGZ	Coconino	3 hr
Sep 10, 10:56 AM MDT	Flash Flood Warning Considerable damage threat	FGZ	Coconino	6 hr
Sep 10, 12:27 PM MDT	Special Weather Statement	FGZ		33 min
Sep 10, 12:32 PM MDT	Severe Thunderstorm Warning	FGZ	Coconino	30 min
Sep 10, 12:55 PM MDT	Flash Flood Warning Considerable damage threat	FGZ	Coconino	4 hr
Sep 10, 2:52 PM MDT	Flash Flood Warning Considerable damage threat	FGZ	Coconino, Navajo	4 hr
Sep 10, 3:26 PM MDT	Flash Flood Warning Considerable damage threat	FGZ	Coconino	5 hr
Sep 10, 4:22 PM MDT	Flash Flood Warning Considerable damage threat	FGZ	Coconino, Navajo	3 hr
Sep 10, 4:29 PM MDT	Flash Flood Warning Considerable damage threat	FGZ	Coconino, Gila	3 hr
Sep 10, 5:14 PM MDT	Flash Flood Warning Considerable damage threat	FGZ	Coconino, Yavapai	110 min
Sep 10, 5:18 PM MDT	Flash Flood Warning Considerable damage threat	FGZ	Coconino, Navajo	3 hr
Sep 10, 5:23 PM MDT	Flash Flood Warning Considerable damage threat	FGZ	Coconino, Navajo	3 hr
Sep 10, 5:39 PM MDT	Flash Flood Warning Considerable damage threat	FGZ	Apache, Navajo	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.