Alert archive / Arizona / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 22, NWS Flagstaff, AZ

July 10, 2021Gila County, Navajo County, Arizona

NWS Flagstaff, AZ issued this severe thunderstorm warning at Jul 10, 2021, 4:40 PM MST for Gila County, Navajo County, Arizona. It was in force for 50 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, 4:40 PM MST (23:40 UTC)
Expired: Jul 10, 2021, 5:30 PM MST
In force: 50 min
Issued by: NWS Flagstaff, AZ
Area: Storm-based polygon
Hail: 1.25 in
Wind: 60.0 mph

Counties Gila County, AZ, Navajo County, AZ

The radar

The Flagstaff radar (KFSX), 81 km from the middle of the area, began a volume at 23:43 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, 11.7 hours before the alert went out and 172 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: 110 J/kg
Mixed-layer CIN: -242 J/kg
Mixed-layer LCL: 2626 m above ground
0-6 km bulk shear: 14 kt
0-1 km storm-relative helicity: 37 m²/s²
0-3 km storm-relative helicity: 131 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

195 
WUUS55 KFGZ 102340
SVRFGZ
AZC007-017-110030-
/O.NEW.KFGZ.SV.W.0022.210710T2340Z-210711T0030Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Flagstaff AZ
440 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...
  Navajo County in north central Arizona...

* Until 530 PM MST.

* At 439 PM MST, a severe thunderstorm was located 19 miles east of
  Young, or 25 miles southeast of Forest Lakes, moving southwest at
  10 mph.

  HAZARD...60 mph wind gusts and half dollar size hail.

  SOURCE...Radar indicated.

  IMPACT...Hail damage to vehicles is expected. Expect wind damage 
           to roofs, siding, and trees.

* This severe thunderstorm will remain over mainly rural areas of
  Gila and Navajo Counties.

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 3408 11062 3400 11053 3383 11072 3394 11089
TIME...MOT...LOC 2339Z 040DEG 7KT 3400 11063 

HAIL...1.25IN
WIND...60MPH
 
$$

RR

1 follow-up statement

271 
WWUS55 KFGZ 110000
SVSFGZ

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

AZC007-017-110030-
/O.CON.KFGZ.SV.W.0022.000000T0000Z-210711T0030Z/
Gila-Navajo-
500 PM MST Sat Jul 10 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 530 PM MST
FOR GILA AND NAVAJO COUNTIES...

At 500 PM MST, a severe thunderstorm was located 18 miles southeast
of Young, or 26 miles south of Forest Lakes, moving southwest at 10
mph.

HAZARD...60 mph wind gusts and half dollar size hail.

SOURCE...Radar indicated.

IMPACT...Hail damage to vehicles is expected. Expect wind damage to 
         roofs, siding, and trees.

This severe thunderstorm will remain over mainly rural areas of Gila
and Navajo Counties.

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 3408 11062 3400 11054 3383 11072 3394 11083
TIME...MOT...LOC 0000Z 040DEG 7KT 3397 11066 

HAIL...1.25IN
WIND...60MPH
 
$$

RR

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 9, 5:00 PM MST	Severe Thunderstorm Warning	FGZ	Yavapai	45 min
Jul 9, 5:11 PM MST	Special Weather Statement	FGZ		34 min
Jul 9, 5:21 PM MST	Special Weather Statement	FGZ	Yavapai	39 min
Jul 9, 5:32 PM MST	Severe Thunderstorm Warning	FGZ	Navajo	43 min
Jul 9, 5:40 PM MST	Severe Thunderstorm Warning	FGZ	Yavapai	35 min
Jul 9, 6:14 PM MST	Severe Thunderstorm Warning	FGZ	Navajo	46 min
Jul 9, 7:14 PM MST	Special Weather Statement	FGZ	Gila	46 min
Jul 10, 12:36 PM MST	Special Weather Statement	FGZ	Apache	24 min
Jul 10, 1:29 PM MST	Areal Flood Advisory	FGZ	Apache	2 hr
Jul 10, 1:38 PM MST	Severe Thunderstorm Warning	FGZ	Coconino, Yavapai	31 min
Jul 10, 1:57 PM MST	Special Weather Statement	FGZ		33 min
Jul 10, 2:21 PM MST	Severe Thunderstorm Warning	FGZ	Yavapai	39 min
Jul 10, 2:40 PM MST	Areal Flood Advisory	FGZ	Gila	4 hr
Jul 10, 2:55 PM MST	Special Weather Statement	FGZ	Yavapai	50 min
Jul 10, 3:40 PM MST	Areal Flood Advisory	FGZ	Yavapai	3 hr
Jul 10, 4:18 PM MST	Severe Thunderstorm Warning	FGZ	Gila	27 min
Jul 10, 4:27 PM MST	Severe Thunderstorm Warning	FGZ	Apache, Navajo	48 min
Jul 10, 4:40 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Gila	3 hr
Jul 10, 4:51 PM MST	Severe Thunderstorm Warning	FGZ	Coconino, Yavapai	24 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.