Alert archive / Arizona / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 65, NWS Flagstaff, AZ

July 23, 2021Yavapai County, Arizona

NWS Flagstaff, AZ issued this severe thunderstorm warning at Jul 23, 2021, 1:31 PM MST for Yavapai County, Arizona. It was in force for 34 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Jul 23, 2021, 1:31 PM MST (20:31 UTC)
Expired
Jul 23, 2021, 2:05 PM MST
In force
34 min
Issued by
NWS Flagstaff, AZ
Area
Storm-based polygon
Tornado
Possible
Hail
1.0 in
Wind
60.0 mph

County Yavapai County, AZ

The radar

The Flagstaff radar (KFSX), 110 km from the middle of the area, began a volume at 20:33 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, 8.5 hours before the alert went out and 80 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, Flgstf/Belemont, AZ at 12:00Z on 2021-07-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 503 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Flgstf/Belemont, AZ at 12:00Z on 2021-07-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 45 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
503 J/kg
Mixed-layer CIN
-51 J/kg
Mixed-layer LCL
915 m above ground
0-6 km bulk shear
11 kt
0-1 km storm-relative helicity
45 m²/s²
0-3 km storm-relative helicity
109 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

687 
WUUS55 KFGZ 232031
SVRFGZ
AZC025-232115-
/O.NEW.KFGZ.SV.W.0065.210723T2031Z-210723T2115Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Flagstaff AZ
131 PM MST Fri Jul 23 2021

The National Weather Service in Flagstaff has issued a

* Severe Thunderstorm Warning for...
  Yavapai County in west central Arizona...

* Until 215 PM MST.

* At 131 PM MST, a severe thunderstorm was located near Chino Valley,
  moving southeast at 25 mph.

  HAZARD...60 mph wind gusts and quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Hail damage to vehicles is expected. Expect wind damage 
           to roofs, siding, and trees.

* Locations impacted include...
  Chino Valley, Prescott Valley, Yavapai County Fairgrounds, Prescott
  Airport, Williamson Valley and Prescott Valley Event Center.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 3471 11255 3484 11238 3467 11213 3452 11233
TIME...MOT...LOC 2031Z 317DEG 21KT 3473 11240 

TORNADO...POSSIBLE
HAIL...1.00IN
WIND...60MPH
 
$$
JJ
2 follow-up statements
518 
WWUS55 KFGZ 232050
SVSFGZ

Severe Weather Statement
National Weather Service Flagstaff AZ
150 PM MST Fri Jul 23 2021

AZC025-232115-
/O.CON.KFGZ.SV.W.0065.000000T0000Z-210723T2115Z/
Yavapai-
150 PM MST Fri Jul 23 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 215 PM MST
FOR YAVAPAI COUNTY...

At 149 PM MST, a severe thunderstorm was located near Yavapai County
Fairgrounds, or near Prescott Valley, moving southeast at 20 mph.

HAZARD...60 mph wind gusts and quarter size hail.

SOURCE...Radar indicated.

IMPACT...Hail damage to vehicles is expected. Expect wind damage to 
         roofs, siding, and trees.

Locations impacted include...
Prescott Valley, Yavapai County Fairgrounds, Prescott Airport and
Prescott Valley Event Center.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 3464 11247 3474 11233 3464 11217 3452 11233
TIME...MOT...LOC 2049Z 316DEG 16KT 3461 11232 

TORNADO...POSSIBLE
HAIL...1.00IN
WIND...60MPH
 
$$
JJ
506 
WWUS55 KFGZ 232105
SVSFGZ

Severe Weather Statement
National Weather Service Flagstaff AZ
205 PM MST Fri Jul 23 2021

AZC025-232114-
/O.CAN.KFGZ.SV.W.0065.000000T0000Z-210723T2115Z/
Yavapai-
205 PM MST Fri Jul 23 2021

...THE SEVERE THUNDERSTORM WARNING FOR YAVAPAI COUNTY IS CANCELLED...
                
The storm which prompted the warning near Prescott Valley has 
weakened below severe limits, however heavy rain is still occurring 
with this thunderstorm. Flooding will be possible.

LAT...LON 3464 11247 3474 11233 3464 11217 3452 11233
TIME...MOT...LOC 2100Z 317DEG 21KT 3454 11225 

$$
JJ

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 22, 7:01 PM MSTAreal Flood WarningFGZNavajo5 min
Jul 22, 7:06 PM MSTFlash Flood Warning Considerable damage threatFGZNavajo3 hr
Jul 22, 8:08 PM MSTFlash Flood Warning Considerable damage threatFGZApache, Navajo3 hr
Jul 22, 10:06 PM MSTFlash Flood Warning Considerable damage threatFGZApache, Gila, Navajo4 hr
Jul 23, 12:57 AM MSTFlash Flood Warning Considerable damage threatFGZGila4 hr
Jul 23, 1:50 AM MSTAreal Flood AdvisoryFGZCoconino, Gila, Yavapai3 hr
Jul 23, 4:07 AM MSTFlash Flood Warning Considerable damage threatFGZYavapai4 hr
Jul 23, 11:21 AM MSTAreal Flood WarningFGZGila6 hr
Jul 23, 11:38 AM MSTSpecial Weather StatementFGZCoconino37 min
Jul 23, 12:07 PM MSTFlash Flood Warning Considerable damage threatFGZCoconino, Yavapai4 hr
Jul 23, 12:14 PM MSTSpecial Weather StatementFGZCoconino46 min
Jul 23, 12:19 PM MSTFlash Flood Warning Considerable damage threatFGZYavapai2 hr
Jul 23, 12:51 PM MSTFlash Flood Warning Considerable damage threatFGZCoconino114 min
Jul 23, 1:17 PM MSTSpecial Weather StatementFGZ43 min
Jul 23, 2:12 PM MSTFlash Flood Warning Considerable damage threatFGZYavapai2 hr
Jul 23, 2:24 PM MSTSpecial Weather StatementFGZYavapai36 min
Jul 23, 2:59 PM MSTFlash Flood Warning Considerable damage threatFGZCoconino7 hr
Jul 23, 3:26 PM MSTFlash Flood Warning Considerable damage threatFGZCoconino, Yavapai3 hr
Jul 23, 3:43 PM MSTSpecial Weather StatementFGZNavajo47 min
Jul 23, 4:01 PM MSTAreal Flood AdvisoryFGZYavapai3 hr
Jul 23, 4:28 PM MSTFlash Flood Warning Considerable damage threatFGZNavajo3 hr

Nearby

Severe Thunderstorm Warnings in Arizona, 2021Every severe thunderstorm warning in 2021

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.