Alert archive / Arizona / Flash Flood Warnings in 2022

Flash Flood Warning 164, NWS Flagstaff, AZ

August 10, 2022Coconino County, Arizona

NWS Flagstaff, AZ issued this flash flood warning at Aug 10, 2022, 7:12 PM MST for Coconino County, Arizona. It was in force for 6 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: Aug 10, 2022, 7:12 PM MST (02:12 UTC)
Expired: Aug 11, 2022, 1:08 AM MST
In force: 6 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 02:12 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 00:00Z, 2.2 hours before the alert went out and 68 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: 10 J/kg
Mixed-layer CIN: -116 J/kg
Mixed-layer LCL: 2967 m above ground
0-6 km bulk shear: 3 kt
0-1 km storm-relative helicity: -50 m²/s²
0-3 km storm-relative helicity: -51 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 Aug 10, 3:30 PM MST, 3 hours 42 minutes earlier.

Area forecast discussion, Aug 10, 3:30 PM MST, 3 hours 42 minutes before

Area Forecast Discussion
National Weather Service Flagstaff AZ
330 PM MST Wed Aug 10 2022

.SYNOPSIS...Daily showers and thunderstorms will continue across
much of northern Arizona at least through the end of the week and
into the weekend with deep monsoonal moisture in place. Scattered
to widespread thunderstorms are likely each afternoon, with flash
flooding being the main threat.

&&

.DISCUSSION...A very active day has developed, roughly along, west
and south of the Mogollon Rim. Outflows are pushing activity a bit
outside of the current FFA, but it looks well placed for now.

Thursday onward, with the high pressure system to our east showing
no sign of major movement from model guidance, monsoonal moisture
will continue across northern Arizona. As a result, expect numerous
to widespread storm coverage throughout the end of the week and into
the weekend.

Be sure to check our social media pages (Twitter and Facebook) and
local forecasts for updates on current weather conditions.

&&

.AVIATION...For the 00Z TAF package...Widespread SHRA/TSRA along
and south of KSJN-KFLG-KGCN line will continue this afternoon with
ISO-SCT activity north of that line. Heavier cells are producing
periods of localized reduced visibility resulting in MVFR/IFR along
with strong, gusty winds. Activity will begin to weaken by 03Z.
However, some storms will linger throughout the evening. Outside of
TSRA, winds remain light. Expect another day of storms Thursday
beginning around 19Z. Aviation discussion not updated for TAF
amendments.

&&

.FIRE WEATHER...Expect widespread showers and thunderstorms each
afternoon through the end of the week, bringing localized flash
flooding. Seasonal temperatures and light winds outside of storms,
with gusty and erratic winds near storms.

Saturday through Monday...Shower and storm chances remain high
through the weekend into next week. Winds will be light away from
storms, with seasonal temperatures.

&&

.FGZ WATCHES/WARNINGS/ADVISORIES...

Flood Watch until 9 PM MST this evening for AZZ004-006>008-015>018-
037-038-104-106>108-115>118-137-138.

&&

PUBLIC...Peterson/Swenson
AVIATION...Peterson
FIRE WEATHER...MAS

For Northern Arizona weather information visit
weather.gov/flagstaff

In the hours before

Local storm report, Aug 10, 4:27 PM MST, 2 hours 45 minutes before

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Local storm report, Aug 10, 5:26 PM MST, 1 hour 46 minutes before

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Local storm report, Aug 10, 6:11 PM MST, 1 hour 1 minute before

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Special weather statement, Aug 10, 6:38 PM MST, 34 minutes before

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Local storm report, Aug 10, 6:48 PM MST, 24 minutes before

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Local storm report, Aug 10, 6:57 PM MST, 15 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
Aug 10, 5:52 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Apache, Navajo	3 hr
Aug 10, 6:38 PM MST	Special Weather Statement	FGZ		37 min
Aug 11, 10:43 AM MST	Flood Watch	FGZ	Apache, Coconino, Gila, Navajo, Yavapai	12 hr
Aug 11, 12:09 PM MST	Areal Flood Advisory	FGZ	Navajo	3 hr
Aug 11, 2:00 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Apache, Navajo	4 hr
Aug 11, 2:01 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Apache, Navajo	5 hr
Aug 11, 2:12 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Coconino	5 hr
Aug 11, 2:16 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Navajo	4 hr
Aug 11, 2:34 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Apache	3 hr
Aug 11, 2:55 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Coconino, Navajo	4 hr
Aug 11, 3:35 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Apache	3 hr
Aug 11, 4:13 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Apache, Navajo	4 hr
Aug 11, 4:44 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Coconino	4 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.