Alert archive / Arizona / Severe Thunderstorm Warnings in 2026

Severe Thunderstorm Warning 101, NWS Flagstaff, AZ

August 29, 2026Yavapai County, Arizona

NWS Flagstaff, AZ issued this severe thunderstorm warning at Aug 29, 2026, 11:52 AM MST for Yavapai County, Arizona. It was in force for 23 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: Aug 29, 2026, 11:52 AM MST (18:52 UTC)
Expired: Aug 29, 2026, 12:15 PM MST
In force: 23 min
Issued by: NWS Flagstaff, AZ
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Yavapai County, AZ

The radar

The Flagstaff radar (KFSX), 124 km from the middle of the area, began a volume at 18:52 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

Phoenix, AZ (KPSR), launched 12:00Z, 6.9 hours before the alert went out and 141 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: 769 J/kg
Mixed-layer CIN: -162 J/kg
Mixed-layer LCL: 2570 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 12 m²/s²
0-3 km storm-relative helicity: 53 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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
Aug 28, 11:48 PM MST	Flood Watch	FGZ	Coconino, Gila, Yavapai	29 hr
Aug 29, 8:19 AM MST	Special Weather Statement	FGZ		26 min
Aug 29, 11:46 AM MST	Special Weather Statement	FGZ	Yavapai	29 min
Aug 29, 11:50 AM MST	Flood Watch	FGZ	Apache, Coconino, Gila, Navajo, Yavapai	60 hr
Aug 29, 12:02 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Coconino	3 hr
Aug 29, 12:27 PM MST	Special Weather Statement	FGZ	Navajo	33 min
Aug 29, 2:28 PM MST	Severe Thunderstorm Warning	FGZ	Coconino	26 min
Aug 29, 2:42 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Coconino	5 hr
Aug 29, 2:59 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Coconino	3 hr
Aug 29, 3:40 PM MST	Severe Thunderstorm Warning	FGZ	Yavapai	34 min

Nearby

Severe Thunderstorm Warnings in Arizona, 2026 Every severe thunderstorm warning in 2026

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.