Alert archive / Arizona / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 4, NWS Flagstaff, AZ

June 29, 2021Yavapai County, Arizona

NWS Flagstaff, AZ issued this severe thunderstorm warning at Jun 29, 2021, 1:58 PM MST for Yavapai County, Arizona. It was in force for 32 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: Jun 29, 2021, 1:58 PM MST (20:58 UTC)
Expired: Jun 29, 2021, 2:30 PM MST
In force: 32 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 Phoenix radar (KIWA), 112 km from the middle of the area, began a volume at 21:00 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, 9.0 hours before the alert went out and 85 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: 3 J/kg
Mixed-layer CIN: -545 J/kg
Mixed-layer LCL: 2595 m above ground
0-6 km bulk shear: 15 kt
0-1 km storm-relative helicity: -49 m²/s²
0-3 km storm-relative helicity: 31 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

748 
WUUS55 KFGZ 292058
SVRFGZ
AZC025-292130-
/O.NEW.KFGZ.SV.W.0004.210629T2058Z-210629T2130Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Flagstaff AZ
158 PM MST Tue Jun 29 2021

The National Weather Service in Flagstaff has issued a

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

* Until 230 PM MST.

* At 158 PM MST, a severe thunderstorm was located near Crown King,
  or 18 miles northwest of New River, moving southeast at 10 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...
  Crown King, Turney Gulch Group Campground and Hazlett Hollow
  Campground.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3413 11242 3427 11228 3417 11213 3402 11228
TIME...MOT...LOC 2058Z 307DEG 8KT 3416 11229 

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

ET

1 follow-up statement

235 
WWUS55 KFGZ 292125
SVSFGZ

Severe Weather Statement
National Weather Service Flagstaff AZ
225 PM MST Tue Jun 29 2021

AZC025-292135-
/O.EXP.KFGZ.SV.W.0004.000000T0000Z-210629T2130Z/
Yavapai-
225 PM MST Tue Jun 29 2021

...THE SEVERE THUNDERSTORM WARNING FOR YAVAPAI COUNTY WILL EXPIRE AT
230 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.

LAT...LON 3413 11242 3427 11228 3417 11213 3402 11228
TIME...MOT...LOC 2125Z 307DEG 8KT 3413 11223 

$$
ET

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 29, 11:34 AM MST	Severe Thunderstorm Warning	FGZ	Coconino	26 min
Jun 29, 11:56 AM MST	Flash Flood Warning Considerable damage threat	FGZ	Coconino, Yavapai	3 hr
Jun 29, 1:05 PM MST	Areal Flood Advisory	FGZ	Coconino, Yavapai	3 hr
Jun 29, 2:24 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Gila	3 hr
Jun 29, 3:03 PM MST	Severe Thunderstorm Warning	FGZ	Coconino	42 min
Jun 29, 3:39 PM MST	Severe Thunderstorm Warning	FGZ	Coconino	36 min
Jun 29, 3:49 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Coconino	3 hr
Jun 29, 4:07 PM MST	Special Weather Statement	FGZ	Gila	23 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.