Alert archive / Arizona / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 12, NWS Flagstaff, AZ

July 9, 2021Yavapai County, Arizona

NWS Flagstaff, AZ issued this severe thunderstorm warning at Jul 9, 2021, 3:42 PM MST for Yavapai County, Arizona. It was in force for 48 min. 3 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Jul 9, 2021, 3:42 PM MST (22:42 UTC)
Expired: Jul 9, 2021, 4:30 PM MST
In force: 48 min
Issued by: NWS Flagstaff, AZ
Area: Storm-based polygon
Hail: 1.5 in
Wind: 70.0 mph

County Yavapai County, AZ

The radar

The Flagstaff radar (KFSX), 56 km from the middle of the area, began a volume at 22:41 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.

What was reported inside it

Time	Report	Where	Remark
Jul 9, 3:50 PM MST	TSTM WND DMG	Rimrock, AZ	SOCIAL MEDIA REPORTS WITH PICTURES OF BLOWN ROOF AND PATIO FURNITURE, AC UNIT RIPPED OFF OF ROOF, AND BROKEN TREE LIMBS.
Jul 9, 3:50 PM MST	HAIL 1.75	Rimrock, AZ	SOCIAL MEDIA REPORTS OF LOST LIVESTOCK, CHICKENS, AND GARDENS AS WELL AS BROKEN WINDOWS AND ROOF DAMAGE. INCLUDED PHOTOS OF GOLF BALL SIZED HAIL.
Jul 9, 3:54 PM MST	HAIL 0.75	Rimrock, AZ

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Flgstf/Belemont, AZ (KFGZ), launched 12:00Z, 10.7 hours before the alert went out and 66 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.

299 
WUUS55 KFGZ 092242
SVRFGZ
AZC025-092330-
/O.NEW.KFGZ.SV.W.0012.210709T2242Z-210709T2330Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Flagstaff AZ
342 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 430 PM MST.

* At 341 PM MST, a severe thunderstorm was located over Lake 
  Montezuma, or 5 miles northeast of Camp Verde, moving southwest at 
  5 mph.

  HAZARD...70 mph wind gusts and ping pong ball size hail.

  SOURCE...Radar indicated.

  IMPACT...People and animals outdoors will be injured. Expect hail 
           damage to roofs, siding, windows, and vehicles. Expect 
           considerable tree damage. Wind damage is also likely to 
           mobile homes, roofs, and outbuildings.

* Locations impacted include...
  Camp Verde, Mcguireville, Montezuma Well, Montezuma Castle National
  Monument, Rimrock, Middle Verde, Lake Montezuma, Wet Beaver Creek
  Campground, V Bar V Visitors Center and Clear Creek Campgrounds.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3475 11179 3461 11162 3448 11181 3461 11199
TIME...MOT...LOC 2241Z 046DEG 6KT 3464 11179 

HAIL...1.50IN
WIND...70MPH
 
$$
JJ

2 follow-up statements

988 
WWUS55 KFGZ 092311
SVSFGZ

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

AZC025-092330-
/O.CON.KFGZ.SV.W.0012.000000T0000Z-210709T2330Z/
Yavapai-
411 PM MST Fri Jul 9 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 430 PM MST
FOR YAVAPAI COUNTY...

At 410 PM MST, a severe thunderstorm was located over Montezuma 
Castle National Monument, or just northeast of Camp Verde, moving 
southwest at 5 mph.

HAZARD...70 mph wind gusts and quarter size hail.

SOURCE...Radar indicated.

IMPACT...Hail damage to vehicles is expected. Expect considerable 
         tree damage. Wind damage is also likely to mobile homes, 
         roofs, and outbuildings.

Locations impacted include...
Camp Verde, Mcguireville, Montezuma Well, Montezuma Castle National
Monument, Rimrock, Middle Verde, Lake Montezuma and Clear Creek
Campgrounds.

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 3470 11178 3460 11163 3448 11181 3461 11199
TIME...MOT...LOC 2310Z 046DEG 6KT 3461 11183 

HAIL...1.00IN
WIND...70MPH
 
$$
JJ

954 
WWUS55 KFGZ 092331
SVSFGZ

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

AZC025-092339-
/O.EXP.KFGZ.SV.W.0012.000000T0000Z-210709T2330Z/
Yavapai-
431 PM MST Fri Jul 9 2021

...THE SEVERE THUNDERSTORM WARNING FOR YAVAPAI COUNTY WILL EXPIRE AT
430 PM MST...
                
The storm which prompted the warning has weakened below severe 
limits. However gusty winds and heavy rain are still occurring 
with this storm. Be alert for flooding, a Flood Advisory has been 
issued for this area until 630 PM MST.

LAT...LON 3470 11178 3460 11163 3448 11181 3461 11199
TIME...MOT...LOC 2329Z 046DEG 6KT 3459 11185 

$$
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, 3:02 PM MST	Severe Thunderstorm Warning	FGZ	Yavapai	28 min
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, 3:45 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.