Alert archive / Arizona / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 13, NWS Flagstaff, AZ

July 9, 2021Gila County, Arizona

NWS Flagstaff, AZ issued this severe thunderstorm warning at Jul 9, 2021, 4:48 PM MST for Gila County, Arizona. It was in force for 42 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 9, 2021, 4:48 PM MST (23:48 UTC)
Expired: Jul 9, 2021, 5:30 PM MST
In force: 42 min
Issued by: NWS Flagstaff, AZ
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Gila County, AZ

The radar

The Flagstaff radar (KFSX), 30 km from the middle of the area, began a volume at 23:49 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 12:00Z, 11.8 hours before the alert went out and 120 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.

357 
WUUS55 KFGZ 092348
SVRFGZ
AZC007-100030-
/O.NEW.KFGZ.SV.W.0013.210709T2348Z-210710T0030Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Flagstaff AZ
448 PM MST Fri Jul 9 2021

The National Weather Service in Flagstaff has issued a

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

* Until 530 PM MST.

* At 448 PM MST, severe thunderstorms were located along a line 
  extending from near Christopher Creek to just north of Young, 
  moving west 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...
  Haigler Creek, Young, Christopher Creek, Tonto Village, Kohls
  Ranch, Hunter Creek, Mead Ranch, Bear Flat, Upper Tonto Creek
  Campground, Ponderosa Campground, Sharp Creek Campground,
  Christopher Creek Campground, Alderwood Campground and Haigler
  Canyon Campground.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3440 11121 3439 11115 3437 11114 3439 11113
      3438 11112 3438 11104 3437 11104 3435 11106
      3434 11104 3434 11103 3437 11102 3431 11096
      3430 11090 3408 11093 3408 11127
TIME...MOT...LOC 2348Z 090DEG 10KT 3435 11097 3413 11101 

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

1 follow-up statement

057 
WWUS55 KFGZ 100028
SVSFGZ

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

AZC007-100037-
/O.EXP.KFGZ.SV.W.0013.000000T0000Z-210710T0030Z/
Gila-
528 PM MST Fri Jul 9 2021

...THE SEVERE THUNDERSTORM WARNING FOR GILA COUNTY WILL EXPIRE AT 530
PM MST...
            
The storms which prompted the warning near Christopher Creek have 
weakened below severe limits. Therefore, the warning will be allowed 
to expire.  However small hail and gusty winds are still possible 
with these thunderstorms.

LAT...LON 3440 11121 3439 11115 3437 11114 3439 11113
      3438 11112 3438 11104 3437 11104 3435 11106
      3434 11104 3434 11103 3437 11102 3431 11096
      3430 11090 3408 11093 3408 11127
TIME...MOT...LOC 0027Z 090DEG 10KT 3435 11108 3413 11112 

$$
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, 3:42 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

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.