Alert archive / Arizona / Severe Thunderstorm Warnings in 2023

Severe Thunderstorm Warning 39, NWS Flagstaff, AZ

August 1, 2023Coconino County, Arizona

NWS Flagstaff, AZ issued this severe thunderstorm warning at Aug 1, 2023, 4:26 PM MST for Coconino County, Arizona. It was in force for 33 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 1, 2023, 4:26 PM MST (23:26 UTC)
Expired
Aug 1, 2023, 4:59 PM MST
In force
33 min
Issued by
NWS Flagstaff, AZ
Area
Storm-based polygon
Hail
0.75 in
Wind
60.0 mph

County Coconino County, AZ

The radar

The Flagstaff radar (KFSX), 150 km from the middle of the area, began a volume at 23:27 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

Las Vegas, NV (KVEF), launched 12:00Z, 11.4 hours before the alert went out and 344 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, Las Vegas, NV at 12:00Z on 2023-08-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 30 joules per kilogram.LCLLFCEL10008507005003002001001 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, Las Vegas, NV at 12:00Z on 2023-08-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 54 square meters per square second.1939Sfc1 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
30 J/kg
Mixed-layer CIN
-280 J/kg
Mixed-layer LCL
1648 m above ground
0-6 km bulk shear
1 kt
0-1 km storm-relative helicity
54 m²/s²
0-3 km storm-relative helicity
26 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.

IssuedProductOfficeCountiesLasted
Jul 31, 5:05 PM MSTSevere Thunderstorm WarningFGZYavapai25 min
Jul 31, 5:30 PM MSTSevere Thunderstorm WarningFGZYavapai30 min
Jul 31, 5:57 PM MSTFlash Flood Warning Considerable damage threatFGZNavajo3 hr
Jul 31, 7:26 PM MSTFlash Flood Warning Considerable damage threatFGZCoconino, Navajo3 hr
Jul 31, 7:31 PM MSTFlash Flood Warning Considerable damage threatFGZCoconino3 hr
Aug 1, 12:35 PM MSTSpecial Weather StatementFGZYavapai25 min
Aug 1, 4:01 PM MSTSpecial Weather StatementFGZ29 min

Nearby

Severe Thunderstorm Warnings in Arizona, 2023Every severe thunderstorm warning in 2023

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.