Alert archive / Arizona / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 50, NWS Flagstaff, AZ

July 16, 2021Gila County, Yavapai County, Arizona

NWS Flagstaff, AZ issued this severe thunderstorm warning at Jul 16, 2021, 5:30 PM MST for Gila County, Yavapai County, Arizona. It was in force for 26 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 16, 2021, 5:30 PM MST (00:30 UTC)
Expired: Jul 16, 2021, 5:56 PM MST
In force: 26 min
Issued by: NWS Flagstaff, AZ
Area: Storm-based polygon
Hail: 1.25 in
Wind: 50.0 mph

Counties Gila County, AZ, Yavapai County, AZ

The radar

The Flagstaff radar (KFSX), 54 km from the middle of the area, began a volume at 00:30 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 00:00Z, 0.5 hours before the alert went out and 100 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: 1249 J/kg
Mixed-layer CIN: -88 J/kg
Mixed-layer LCL: 2188 m above ground
0-6 km bulk shear: 11 kt
0-1 km storm-relative helicity: 24 m²/s²
0-3 km storm-relative helicity: 147 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

238 
WUUS55 KFGZ 170030
SVRFGZ
AZC007-025-170115-
/O.NEW.KFGZ.SV.W.0050.210717T0030Z-210717T0115Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Flagstaff AZ
530 PM MST Fri Jul 16 2021

The National Weather Service in Flagstaff has issued a

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

* Until 615 PM MST.

* At 527 PM MST, Severe thunderstorms were located 9 miles south of 
  Childs Power Plant, moving southwest at 10 mph.

  HAZARD...Half dollar size hail.

  SOURCE...Radar indicated.

  IMPACT...Damage to vehicles is expected.

* Locations impacted include...
  Payson, Childs Power Plant, East Verde Estates and Tonto Natural 
  Bridge State Park may be impacted. Storms are becoming quickly 
  severe then just as rapidly dissipating.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3449 11184 3430 11133 3411 11137 3410 11173
      3431 11196
TIME...MOT...LOC 0027Z 029DEG 9KT 3423 11175 

HAIL...1.25IN
WIND...<50MPH
 
$$

McCollum

1 follow-up statement

524 
WWUS55 KFGZ 170056
SVSFGZ

Severe Weather Statement
National Weather Service Flagstaff AZ
556 PM MST Fri Jul 16 2021

AZC007-025-170106-
/O.CAN.KFGZ.SV.W.0050.000000T0000Z-210717T0115Z/
Gila-Yavapai-
556 PM MST Fri Jul 16 2021

...THE SEVERE THUNDERSTORM WARNING FOR GILA AND YAVAPAI COUNTIES IS
CANCELLED...
                
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 has been cancelled.

LAT...LON 3449 11184 3430 11133 3411 11137 3410 11173
      3431 11196
TIME...MOT...LOC 0052Z 029DEG 9KT 3417 11179 

$$

McCollum

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 16, 5:19 PM MST	Severe Thunderstorm Warning	FGZ	Yavapai	26 min
Jul 16, 5:55 PM MST	Areal Flood Advisory	FGZ	Coconino, Gila, Yavapai	3 hr
Jul 16, 6:38 PM MST	Special Weather Statement	FGZ	Yavapai	52 min
Jul 16, 7:24 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Yavapai	3 hr
Jul 16, 10:22 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Yavapai	6 hr
Jul 17, 1:47 PM MST	Special Weather Statement	FGZ		28 min
Jul 17, 2:24 PM MST	Special Weather Statement	FGZ		21 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.