Alert archive / Arizona / Severe Thunderstorm Warnings in 2022

Severe Thunderstorm Warning 14, NWS Flagstaff, AZ

July 17, 2022Navajo County, Arizona

NWS Flagstaff, AZ issued this severe thunderstorm warning at Jul 17, 2022, 1:38 PM MDT for Navajo County, Arizona. It was in force for 37 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
Jul 17, 2022, 1:38 PM MDT (19:38 UTC)
Expired
Jul 17, 2022, 2:15 PM MDT
In force
37 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 19:37 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, 7.6 hours before the alert went out and 266 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, Phoenix, AZ at 12:00Z on 2022-07-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 124 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, Phoenix, AZ at 12:00Z on 2022-07-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 17 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
124 J/kg
Mixed-layer CIN
-614 J/kg
Mixed-layer LCL
2663 m above ground
0-6 km bulk shear
20 kt
0-1 km storm-relative helicity
17 m²/s²
0-3 km storm-relative helicity
64 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 Jul 17, 10:45 AM MDT, 2 hours 53 minutes earlier.

Area forecast discussion, Jul 17, 10:45 AM MDT, 2 hours 53 minutes before
Area Forecast Discussion
National Weather Service Flagstaff AZ
945 AM MST Sun Jul 17 2022

.SYNOPSIS...Monsoon moisture will remain in place for the
foreseeable future. Expect showers and thunderstorms to develop
each day, with lightning and heavy rain being the primary threats.
Warmer than average temperatures are expected this weekend and
lasting into next week.

&&

.DISCUSSION...Sunny skies, decent PW values and southeasterly
steering flow will make for an active day today. Expect initial
storm activity over higher terrain features, the Mogollon Rim, the
Bradshaws and the Chuskas, spreading westward through the day and
into this evening.

These conditions repeat for Monday, although there may be a slight
downturn in activity, if we get really worked over today. Daytime
temperatures will remain very warm for this forecast period, the
only relief coming from rainfall.

Forecast is in good shape, no updates needed.

&&

.AVIATION...For the 18Z TAF package...Mainly VFR conditions are
expected for the TAF period, outside of thunderstorms. Areas MVFR
possible from 18Z-03Z, due to SHRA/TSRA and ISOLD +TSRA. Sfc winds
generally light, aside from thunderstorm activity. Aviation
discussion not updated for TAF amendments.

&&

.FIRE WEATHER...Scattered showers and thunderstorms and warm
temperatures are expected Sunday and Monday. Storms most numerous
initially over higher terrain feature, then shifting westward late
each afternoon and evening.

Tuesday through Thursday...Chances for afternoon and evening showers
and thunderstorms remain, but the emphasis for storm activity shifts
a bit eastward. Outside of thunderstorms, temperatures will be warm
with generally light winds.

&&

.FGZ WATCHES/WARNINGS/ADVISORIES...

Excessive Heat Warning until 6 PM MST Wednesday for AZZ005-006 below
4500 feet.

&&

PUBLIC...Peterson
AVIATION...Peterson
FIRE WEATHER...BAJ/Peterson

For Northern Arizona weather information visit
weather.gov/flagstaff

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 16, 6:57 PM MDTSpecial Weather StatementFGZYavapai48 min
Jul 16, 8:19 PM MDTSpecial Weather StatementFGZ26 min
Jul 16, 9:00 PM MDTAreal Flood AdvisoryFGZApache, Navajo3 hr
Jul 16, 9:59 PM MDTAreal Flood AdvisoryFGZYavapai2 hr
Jul 17, 1:19 AM MDTSpecial Weather StatementFGZ41 min
Jul 17, 2:16 PM MDTSevere Thunderstorm WarningFGZApache, Navajo44 min
Jul 17, 2:39 PM MDTSevere Thunderstorm WarningFGZGila51 min
Jul 17, 2:58 PM MDTSpecial Weather StatementFGZ32 min
Jul 17, 3:27 PM MDTSpecial Weather StatementFGZCoconino33 min
Jul 17, 3:42 PM MDTSevere Thunderstorm WarningFGZGila48 min
Jul 17, 3:54 PM MDTFlash Flood Warning Considerable damage threatFGZCoconino, Gila3 hr
Jul 17, 4:13 PM MDTFlash Flood Warning Considerable damage threatFGZGila, Navajo3 hr
Jul 17, 4:26 PM MDTSevere Thunderstorm WarningFGZCoconino, Gila, Yavapai49 min
Jul 17, 4:39 PM MDTSpecial Weather StatementFGZNavajo36 min
Jul 17, 5:01 PM MDTSevere Thunderstorm WarningFGZYavapai44 min
Jul 17, 5:38 PM MDTFlash Flood Warning Considerable damage threatFGZYavapai3 hr
Jul 17, 5:46 PM MDTSpecial Weather StatementFGZYavapai29 min

Nearby

Severe Thunderstorm Warnings in Arizona, 2022Every severe thunderstorm warning in 2022

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.