Alert archive / Arizona / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 8, NWS Flagstaff, AZ

July 8, 2021Yavapai County, Arizona

NWS Flagstaff, AZ issued this severe thunderstorm warning at Jul 8, 2021, 5:28 PM MST for Yavapai County, Arizona. It was in force for 19 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 8, 2021, 5:28 PM MST (00:28 UTC)
Expired: Jul 8, 2021, 5:47 PM MST
In force: 19 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), 98 km from the middle of the area, began a volume at 00:32 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 00:00Z, 0.5 hours before the alert went out and 99 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: 216 J/kg
Mixed-layer CIN: -71 J/kg
Mixed-layer LCL: 2828 m above ground
0-6 km bulk shear: 15 kt
0-1 km storm-relative helicity: 37 m²/s²
0-3 km storm-relative helicity: 123 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

493 
WUUS55 KFGZ 090028
SVRFGZ
AZC025-090100-
/O.NEW.KFGZ.SV.W.0008.210709T0028Z-210709T0100Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Flagstaff AZ
528 PM MST Thu Jul 8 2021

The National Weather Service in Flagstaff has issued a

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

* Until 600 PM MST.

* At 526 PM MST, a severe thunderstorm was located over Mayer, or 14
  miles southeast of Prescott Valley, moving south 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...
  Mayer and Poland Junction. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3445 11233 3449 11218 3437 11212 3433 11232
TIME...MOT...LOC 0026Z 343DEG 8KT 3442 11224 

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

1 follow-up statement

023 
WWUS55 KFGZ 090047
SVSFGZ

Severe Weather Statement
National Weather Service Flagstaff AZ
547 PM MST Thu Jul 8 2021

AZC025-090056-
/O.CAN.KFGZ.SV.W.0008.000000T0000Z-210709T0100Z/
Yavapai-
547 PM MST Thu Jul 8 2021

...THE SEVERE THUNDERSTORM WARNING FOR YAVAPAI COUNTY IS CANCELLED...
                
The storm which prompted the warning near Mayer has weakened below 
severe limits. Therefore, the warning has been cancelled.  However 
heavy rain is still occurring with this thunderstorm.

LAT...LON 3445 11233 3449 11218 3437 11212 3433 11232
TIME...MOT...LOC 0045Z 343DEG 8KT 3438 11222 

$$
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, 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, 3:42 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.