Alert archive / Arizona / Flash Flood Warnings in 2024

Flash Flood Warning 66, NWS Flagstaff, AZ

August 12, 2024Coconino County, Gila County, Arizona

NWS Flagstaff, AZ issued this flash flood warning at Aug 12, 2024, 3:13 PM MST for Coconino County, Gila 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: Aug 12, 2024, 3:13 PM MST (22:13 UTC)
Expired: Aug 12, 2024, 6:15 PM MST
In force: 3 hr
Issued by: NWS Flagstaff, AZ
Area: Storm-based polygon
Damage threat: Considerable
Flood severity: None

Counties Coconino County, AZ, Gila County, AZ

The radar

The Flagstaff radar (KFSX), 29 km from the middle of the area, began a volume at 22:15 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

Tuscon, AZ (KTUS), launched 12:00Z, 10.2 hours before the alert went out and 297 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: 219 J/kg
Mixed-layer CIN: -186 J/kg
Mixed-layer LCL: 1948 m above ground
0-6 km bulk shear: 17 kt
0-1 km storm-relative helicity: -24 m²/s²
0-3 km storm-relative helicity: 20 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 12, 2:46 PM MST, 27 minutes earlier.

Area forecast discussion, Aug 12, 2:46 PM MST, 27 minutes before

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In the hours before

Special weather statement, Aug 12, 12:57 PM MST, 2 hours 16 minutes before

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Special weather statement, Aug 12, 1:04 PM MST, 2 hours 9 minutes before

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Local storm report, Aug 12, 1:22 PM MST, 1 hour 51 minutes before

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Special weather statement, Aug 12, 1:43 PM MST, 1 hour 30 minutes before

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Special weather statement, Aug 12, 1:58 PM MST, 1 hour 15 minutes before

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Local storm report, Aug 12, 3:07 PM MST, 6 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 11, 5:31 PM MST	Severe Thunderstorm Warning	FGZ	Coconino	20 min
Aug 11, 5:48 PM MST	Severe Thunderstorm Warning	FGZ	Coconino, Yavapai	27 min
Aug 12, 12:46 PM MST	Severe Thunderstorm Warning	FGZ	Yavapai	29 min
Aug 12, 12:57 PM MST	Special Weather Statement	FGZ		48 min
Aug 12, 1:04 PM MST	Special Weather Statement	FGZ	Coconino	26 min
Aug 12, 1:38 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Coconino, Navajo	4 hr
Aug 12, 1:43 PM MST	Special Weather Statement	FGZ	Coconino	32 min
Aug 12, 1:58 PM MST	Special Weather Statement	FGZ		32 min
Aug 12, 2:17 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Coconino	4 hr
Aug 12, 2:45 PM MST	Severe Thunderstorm Warning	FGZ	Coconino, Gila	45 min
Aug 12, 3:22 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Coconino	3 hr
Aug 12, 3:42 PM MST	Special Weather Statement	FGZ		33 min
Aug 12, 3:58 PM MST	Severe Thunderstorm Warning	FGZ	Coconino	32 min
Aug 12, 4:40 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Coconino	3 hr

Nearby

Flash Flood Warnings in Arizona, 2024 Every 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.