Alert archive / Arizona / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 27, NWS Flagstaff, AZ

July 10, 2021Gila County, Yavapai County, Arizona

NWS Flagstaff, AZ issued this severe thunderstorm warning at Jul 10, 2021, 6:44 PM MST for Gila County, Yavapai County, Arizona. It was in force for 35 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 10, 2021, 6:44 PM MST (01:44 UTC)
Expired: Jul 10, 2021, 7:19 PM MST
In force: 35 min
Issued by: NWS Flagstaff, AZ
Area: Storm-based polygon
Hail: 1.0 in
Wind: 70.0 mph

Counties Gila County, AZ, Yavapai County, AZ

The radar

The Flagstaff radar (KFSX), 67 km from the middle of the area, began a volume at 01:47 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jul 10, 4:52 PM MST	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Phoenix, AZ (KPSR), launched 00:00Z, 1.7 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: 965 J/kg
Mixed-layer CIN: -311 J/kg
Mixed-layer LCL: 3378 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 2 m²/s²
0-3 km storm-relative helicity: 116 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.0

Open this sounding in Storm Lab

The text

As transmitted.

946 
WUUS55 KFGZ 110144
SVRFGZ
AZC007-025-110230-
/O.NEW.KFGZ.SV.W.0027.210711T0144Z-210711T0230Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Flagstaff AZ
644 PM MST Sat Jul 10 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 730 PM MST.

* At 644 PM MST, a severe thunderstorm was located near Horseshoe
  Reservoir, or 19 miles northwest of Sycamore Creek, moving
  southwest at 25 mph.

  HAZARD...70 mph wind gusts and quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Hail damage to vehicles is expected. Expect considerable 
           tree damage. Wind damage is also likely to mobile homes, 
           roofs, and outbuildings.

* Locations impacted include...
  Horseshoe Reservoir and Black Canyon City. 

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 3401 11143 3400 11150 3400 11174 3405 11213
      3439 11178 3417 11144 3399 11142
TIME...MOT...LOC 0144Z 044DEG 41KT 3411 11173 

HAIL...1.00IN
WIND...70MPH
 
$$

RR

2 follow-up statements

653 
WWUS55 KFGZ 110207
SVSFGZ

Severe Weather Statement
National Weather Service Flagstaff AZ
707 PM MST Sat Jul 10 2021

AZC007-110216-
/O.CAN.KFGZ.SV.W.0027.000000T0000Z-210711T0230Z/
Gila-
707 PM MST Sat Jul 10 2021

...THE SEVERE THUNDERSTORM WARNING FOR GILA COUNTY IS CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

A Severe Thunderstorm Watch remains in effect until midnight MST for
east central Arizona.

LAT...LON 3400 11174 3405 11213 3420 11198 3418 11169
      3416 11172 3415 11171 3415 11148 3413 11149
      3411 11147 3410 11149 3407 11146 3405 11147
      3403 11150 3400 11150
TIME...MOT...LOC 0206Z 044DEG 41KT 3393 11194 

$$

AZC025-110230-
/O.CON.KFGZ.SV.W.0027.000000T0000Z-210711T0230Z/
Yavapai-
707 PM MST Sat Jul 10 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 730 PM MST
FOR YAVAPAI COUNTY...

At 706 PM MST, a severe thunderstorm was located near Cave Creek, or
10 miles east of New River, moving southwest at 20 mph.

HAZARD...70 mph wind gusts and quarter size hail.

SOURCE...Radar indicated.

IMPACT...Hail damage to vehicles is expected. Expect considerable 
         tree damage. Wind damage is also likely to mobile homes, 
         roofs, and outbuildings.

Locations impacted include...
Horseshoe Reservoir and Black Canyon City. 

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 3400 11174 3405 11213 3420 11198 3418 11169
      3416 11172 3415 11171 3415 11148 3413 11149
      3411 11147 3410 11149 3407 11146 3405 11147
      3403 11150 3400 11150
TIME...MOT...LOC 0206Z 044DEG 41KT 3393 11194 

HAIL...1.00IN
WIND...70MPH
 
$$

RR

042 
WWUS55 KFGZ 110219
SVSFGZ

Severe Weather Statement
National Weather Service Flagstaff AZ
719 PM MST Sat Jul 10 2021

AZC025-110229-
/O.CAN.KFGZ.SV.W.0027.000000T0000Z-210711T0230Z/
Yavapai-
719 PM MST Sat Jul 10 2021

...THE SEVERE THUNDERSTORM WARNING FOR YAVAPAI COUNTY 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.

A Severe Thunderstorm Watch remains in effect until midnight MST for
east central Arizona.

LAT...LON 3400 11174 3405 11213 3420 11198 3418 11169
      3416 11172 3415 11171 3415 11148 3413 11149
      3411 11147 3410 11149 3407 11146 3405 11147
      3403 11150 3400 11150
TIME...MOT...LOC 0212Z 044DEG 41KT 3382 11206 

$$

RR

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 10, 5:09 PM MST	Severe Thunderstorm Warning	FGZ	Coconino, Gila, Yavapai	51 min
Jul 10, 5:16 PM MST	Severe Thunderstorm Warning	FGZ	Apache, Coconino, Gila, Navajo	44 min
Jul 10, 5:56 PM MST	Severe Thunderstorm Warning	FGZ	Gila, Yavapai	49 min
Jul 10, 6:23 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Gila, Navajo	3 hr
Jul 11, 3:22 PM MST	Special Weather Statement	FGZ	Yavapai	23 min
Jul 11, 3:35 PM MST	Severe Thunderstorm Warning	FGZ	Yavapai	40 min
Jul 11, 3:49 PM MST	Severe Thunderstorm Warning	FGZ	Yavapai	41 min
Jul 11, 4:25 PM MST	Severe Thunderstorm Warning	FGZ	Yavapai	35 min
Jul 11, 4:46 PM MST	Severe Thunderstorm Warning	FGZ	Yavapai	29 min
Jul 11, 4:58 PM MST	Severe Thunderstorm Warning	FGZ	Yavapai	11 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.