Alert archive / Arizona / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 9, NWS Flagstaff, AZ

July 9, 2021Yavapai County, Arizona

NWS Flagstaff, AZ issued this severe thunderstorm warning at Jul 9, 2021, 3:02 PM MST for Yavapai County, Arizona. It was in force for 28 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 9, 2021, 3:02 PM MST (22:02 UTC)
Expired: Jul 9, 2021, 3:30 PM MST
In force: 28 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), 82 km from the middle of the area, began a volume at 22:03 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, 10.0 hours before the alert went out and 67 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: 115 J/kg
Mixed-layer CIN: -284 J/kg
Mixed-layer LCL: 2249 m above ground
0-6 km bulk shear: 5 kt
0-1 km storm-relative helicity: 74 m²/s²
0-3 km storm-relative helicity: 130 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

907 
WUUS55 KFGZ 092202
SVRFGZ
AZC025-092230-
/O.NEW.KFGZ.SV.W.0009.210709T2202Z-210709T2230Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Flagstaff AZ
302 PM MST Fri Jul 9 2021

The National Weather Service in Flagstaff has issued a

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

* Until 330 PM MST.

* At 300 PM MST, a severe thunderstorm was located near Cherry, or 14
  miles west of Camp Verde, and is nearly stationary.

  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...
  Cherry, Cottonwood, Jerome, Powell Springs Campground, Mingus
  Mountain Campground, Playground Group Campground and Potato Patch
  Campground.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Prepare immediately for large hail and deadly cloud to ground
lightning. Seek shelter inside a well-built structure. Stay away from
windows.

&&

LAT...LON 3476 11210 3469 11195 3454 11204 3464 11223
TIME...MOT...LOC 2200Z 040DEG 4KT 3465 11209 

HAIL...1.00IN
WIND...60MPH
 
$$

DB

1 follow-up statement

461 
WWUS55 KFGZ 092228
SVSFGZ

Severe Weather Statement
National Weather Service Flagstaff AZ
328 PM MST Fri Jul 9 2021

AZC025-092237-
/O.EXP.KFGZ.SV.W.0009.000000T0000Z-210709T2230Z/
Yavapai-
328 PM MST Fri Jul 9 2021

...THE SEVERE THUNDERSTORM WARNING FOR YAVAPAI COUNTY WILL EXPIRE AT
330 PM MST...
                
The storm which prompted the warning near Cottonwood has weakened 
below severe limits, therefore the warning will be allowed to 
expire.  However heavy rain is still occurring with this 
thunderstorm and may lead to flooding.

LAT...LON 3476 11210 3469 11195 3454 11204 3464 11223
TIME...MOT...LOC 2227Z 040DEG 4KT 3463 11211 

$$
JJ

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 8, 5:13 PM MST	Special Weather Statement	FGZ	Yavapai	32 min
Jul 8, 5:28 PM MST	Severe Thunderstorm Warning	FGZ	Yavapai	19 min
Jul 8, 6:25 PM MST	Special Weather Statement	FGZ	Yavapai	50 min
Jul 8, 7:03 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Yavapai	3 hr
Jul 9, 3:22 PM MST	Severe Thunderstorm Warning	FGZ	Gila	23 min
Jul 9, 3:33 PM MST	Severe Thunderstorm Warning	FGZ	Yavapai	27 min
Jul 9, 3:42 PM MST	Severe Thunderstorm Warning	FGZ	Yavapai	48 min
Jul 9, 3:45 PM MST	Areal Flood Advisory	FGZ	Yavapai	2 hr
Jul 9, 3:59 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Yavapai	3 hr
Jul 9, 4:26 PM MST	Areal Flood Advisory	FGZ	Yavapai	2 hr
Jul 9, 4:48 PM MST	Severe Thunderstorm Warning	FGZ	Gila	42 min

Nearby

Severe Thunderstorm Warnings in Arizona, 2021 Every 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.