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-pSkew-T log-p diagram, Tuscon, AZ at 00:00Z on 2025-09-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 479 joules per kilogram.LCLEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Tuscon, AZ at 00:00Z on 2025-09-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 83 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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.

IssuedProductOfficeCountiesLasted
Sep 27, 5:27 PM MSTFlash Flood Warning Considerable damage threatFGZCoconino2 hr
Sep 27, 6:21 PM MSTSpecial Weather StatementFGZ24 min
Sep 27, 6:59 PM MSTSpecial Weather StatementFGZYavapai31 min
Sep 27, 7:26 PM MSTSevere Thunderstorm WarningFGZYavapai34 min
Sep 27, 8:32 PM MSTSpecial Weather StatementFGZYavapai28 min
Sep 28, 11:53 AM MSTAreal Flood AdvisoryFGZYavapai3 hr
Sep 28, 2:04 PM MSTFlash Flood Warning Considerable damage threatFGZYavapai5 hr
Sep 28, 2:21 PM MSTSevere Thunderstorm WarningFGZCoconino, Gila, Yavapai24 min
Sep 28, 2:25 PM MSTFlash Flood Warning Considerable damage threatFGZYavapai4 hr
Sep 28, 2:43 PM MSTSevere Thunderstorm WarningFGZCoconino, Gila32 min
Sep 28, 3:14 PM MSTSevere Thunderstorm WarningFGZCoconino, Gila31 min
Sep 28, 3:27 PM MSTFlash Flood Warning Considerable damage threatFGZCoconino, Gila3 hr

Nearby

Flash Flood Warnings in Arizona, 2025Every 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.