Alert archive / Arizona / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 7, NWS Flagstaff, AZ

June 30, 2021Yavapai County, Arizona

NWS Flagstaff, AZ issued this severe thunderstorm warning at Jun 30, 2021, 12:47 PM MST for Yavapai County, Arizona. It was in force for 28 min. 1 report 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: Jun 30, 2021, 12:47 PM MST (19:47 UTC)
Expired: Jun 30, 2021, 1:15 PM MST
In force: 28 min
Issued by: NWS Flagstaff, AZ
Area: Storm-based polygon
Hail: 0.88 in
Wind: 60.0 mph

County Yavapai County, AZ

The radar

The Flagstaff radar (KFSX), 63 km from the middle of the area, began a volume at 19:46 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
Jun 30, 12:50 PM MST	TSTM WND GST 58	2 Se Middle Verde, AZ	PUBLIC WEATHER STATION REPORTS WIND GUST OF 58 MPH. STATION ON WEATHER UNDERGROUND AT MONTEZUMA HEIGHTS AIRPARK - SITE ID KAZCAMPV9.

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, 7.8 hours before the alert went out and 79 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: 13 J/kg
Mixed-layer CIN: -125 J/kg
Mixed-layer LCL: 1530 m above ground
0-6 km bulk shear: 9 kt
0-1 km storm-relative helicity: 10 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 text

As transmitted.

158 
WUUS55 KFGZ 301947
SVRFGZ
AZC025-302015-
/O.NEW.KFGZ.SV.W.0007.210630T1947Z-210630T2015Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Flagstaff AZ
1247 PM MST Wed Jun 30 2021

The National Weather Service in Flagstaff has issued a

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

* Until 115 PM MST.

* At 1246 PM MST, a severe thunderstorm was located near Camp Verde,
  moving east at 5 mph.

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

  SOURCE...Radar indicated.

  IMPACT...Expect damage to roofs, siding, and trees.

* Locations impacted include...
  Camp Verde, Middle Verde, Montezuma Castle National Monument 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 3448 11201 3463 11197 3461 11170 3440 11175
TIME...MOT...LOC 1946Z 276DEG 6KT 3453 11189 

HAIL...0.88IN
WIND...60MPH
 
$$

MCT

2 follow-up statements

806 
WWUS55 KFGZ 302002
SVSFGZ

Severe Weather Statement
National Weather Service Flagstaff AZ
102 PM MST Wed Jun 30 2021

AZC025-302015-
/O.CON.KFGZ.SV.W.0007.000000T0000Z-210630T2015Z/
Yavapai-
102 PM MST Wed Jun 30 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 115 PM MST
FOR YAVAPAI COUNTY...

At 102 PM MST, a severe thunderstorm was located over Camp Verde,
moving east at 5 mph.

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

SOURCE...Radar indicated.

IMPACT...Expect damage to roofs, siding, and trees.

Locations impacted include...
Camp Verde, Middle Verde, Montezuma Castle National Monument 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 3447 11199 3463 11194 3461 11170 3440 11175
TIME...MOT...LOC 2002Z 276DEG 6KT 3453 11186 

HAIL...0.88IN
WIND...60MPH
 
$$

MCT

829 
WWUS55 KFGZ 302011
SVSFGZ

Severe Weather Statement
National Weather Service Flagstaff AZ
111 PM MST Wed Jun 30 2021

AZC025-302021-
/O.EXP.KFGZ.SV.W.0007.000000T0000Z-210630T2015Z/
Yavapai-
111 PM MST Wed Jun 30 2021

...THE SEVERE THUNDERSTORM WARNING FOR YAVAPAI COUNTY WILL EXPIRE AT
115 PM MST...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning will be allowed to expire.  However small 
hail, gusty winds up to 50 mph and heavy rain are still possible 
with this thunderstorm.

LAT...LON 3447 11199 3463 11194 3461 11170 3440 11175
TIME...MOT...LOC 2011Z 276DEG 6KT 3453 11185 

$$

MCT

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 30, 11:54 AM MST	Areal Flood Advisory	FGZ	Yavapai	4 hr
Jun 30, 12:23 PM MST	Special Weather Statement	FGZ		52 min
Jun 30, 12:39 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Yavapai	3 hr
Jun 30, 2:38 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Gila, Yavapai	2 hr
Jun 30, 3:20 PM MST	Areal Flood Advisory	FGZ	Gila	3 hr

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.