Alert archive / Arizona / Flash Flood Warnings in 2025

Flash Flood Warning 53, NWS Flagstaff, AZ

September 28, 2025Coconino County, Gila County, Arizona

NWS Flagstaff, AZ issued this flash flood warning at Sep 28, 2025, 4:38 AM MST for Coconino County, Gila County, Arizona. It was in force for 5 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 28, 2025, 4:38 AM MST (11:38 UTC)
Expired: Sep 28, 2025, 9:15 AM MST
In force: 5 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 11:38 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 00:00Z, 11.6 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: 479 J/kg
Mixed-layer CIN: -22 J/kg
Mixed-layer LCL: 2079 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 83 m²/s²
0-3 km storm-relative helicity: 139 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.0

Open this sounding in Storm Lab

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 27, 5:27 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Coconino	2 hr
Sep 27, 6:21 PM MST	Special Weather Statement	FGZ		24 min
Sep 27, 6:59 PM MST	Special Weather Statement	FGZ	Yavapai	31 min
Sep 27, 7:26 PM MST	Severe Thunderstorm Warning	FGZ	Yavapai	34 min
Sep 27, 8:32 PM MST	Special Weather Statement	FGZ	Yavapai	28 min
Sep 28, 11:53 AM MST	Areal Flood Advisory	FGZ	Yavapai	3 hr
Sep 28, 2:04 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Yavapai	5 hr
Sep 28, 2:21 PM MST	Severe Thunderstorm Warning	FGZ	Coconino, Gila, Yavapai	24 min
Sep 28, 2:25 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Yavapai	4 hr
Sep 28, 2:43 PM MST	Severe Thunderstorm Warning	FGZ	Coconino, Gila	32 min
Sep 28, 3:14 PM MST	Severe Thunderstorm Warning	FGZ	Coconino, Gila	31 min
Sep 28, 3:27 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Coconino, Gila	3 hr

Nearby

Flash Flood Warnings in Arizona, 2025 Every flash flood warning in 2025

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.