Alert archive / Arizona / Severe Thunderstorm Warnings in 2025

Severe Thunderstorm Warning 45, NWS Flagstaff, AZ

September 25, 2025Navajo County, Arizona

NWS Flagstaff, AZ issued this severe thunderstorm warning at Sep 25, 2025, 3:00 PM MDT for Navajo County, Arizona. It was in force for 30 min. 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 25, 2025, 3:00 PM MDT (21:00 UTC)
Expired: Sep 25, 2025, 3:30 PM MDT
In force: 30 min
Issued by: NWS Flagstaff, AZ
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Navajo County, AZ

The radar

The Flagstaff radar (KFSX), 122 km from the middle of the area, began a volume at 21:01 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, 9.0 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: 2344 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 107 m²/s²
0-3 km storm-relative helicity: 123 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 severe thunderstorm 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 severe thunderstorm warning went out at Sep 25, 11:56 AM MDT, 3 hours 4 minutes earlier.

Area forecast discussion, Sep 25, 11:56 AM MDT, 3 hours 4 minutes before

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In the hours before

Special weather statement, Sep 25, 2:46 PM MDT, 14 minutes before

Special Weather Statement
National Weather Service Flagstaff AZ
146 PM MST Thu Sep 25 2025

AZZ013-014-252115-
Little Colorado River Valley in Navajo County AZ-Little Colorado
River Valley in Apache County AZ-
146 PM MST Thu Sep 25 2025 /246 PM MDT Thu Sep 25 2025/

...A STRONG THUNDERSTORM WILL IMPACT APACHE AND NAVAJO COUNTIES
UNTIL 215 PM MST /315 PM MDT/...

At 146 PM MST /246 PM MDT/, Doppler radar was tracking a strong
thunderstorm 6 miles north of Taylor Airport, or 20 miles north of
Show Low, moving east at 15 mph.

HAZARD...Wind gusts up to 50 mph and half inch size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects. Minor damage to outdoor objects is possible.

Locations impacted include...
  Taylor, Shumway, Taylor Airport, Snowflake and White Mountain Lake
  Estates.

This includes the following highways...
	State Route 277 between mile markers 332 and 336.
	State Route 77 between mile markers 356 and 370.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Monitor the weather situation closely and be alert for threatening
weather conditions.

&&

LAT...LON 3445 11016 3464 11017 3467 10982 3435 10983
TIME...MOT...LOC 2046Z 277DEG 13KT 3453 11008

MAX HAIL SIZE...0.50 IN
MAX WIND GUST...50 MPH

Bernhart

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 25, 1:16 PM MDT	Severe Thunderstorm Warning	FGZ	Navajo	29 min
Sep 25, 2:46 PM MDT	Special Weather Statement	FGZ		29 min
Sep 25, 3:22 PM MDT	Special Weather Statement	FGZ		23 min
Sep 25, 3:47 PM MDT	Areal Flood Advisory	FGZ	Coconino, Yavapai	3 hr
Sep 25, 3:56 PM MDT	Special Weather Statement	FGZ		34 min
Sep 25, 4:22 PM MDT	Severe Thunderstorm Warning	FGZ	Coconino	23 min
Sep 25, 4:34 PM MDT	Special Weather Statement	FGZ		26 min
Sep 25, 4:53 PM MDT	Special Weather Statement	FGZ		37 min
Sep 25, 5:07 PM MDT	Special Weather Statement	FGZ		23 min
Sep 25, 5:23 PM MDT	Special Weather Statement	FGZ		37 min

Nearby

Severe Thunderstorm Warnings in Arizona, 2025 Every severe thunderstorm 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.