Alert archive / Arizona / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 20, NWS Flagstaff, AZ

July 10, 2021Gila County, Arizona

NWS Flagstaff, AZ issued this severe thunderstorm warning at Jul 10, 2021, 4:18 PM MST for Gila County, Arizona. It was in force for 27 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, 4:18 PM MST (23:18 UTC)
Expired: Jul 10, 2021, 4:45 PM MST
In force: 27 min
Issued by: NWS Flagstaff, AZ
Area: Storm-based polygon
Hail: 1.25 in
Wind: 60.0 mph

County Gila County, AZ

The radar

The Flagstaff radar (KFSX), 99 km from the middle of the area, began a volume at 23:20 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, 11.3 hours before the alert went out and 191 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.

918 
WUUS55 KFGZ 102318
SVRFGZ
AZC007-102345-
/O.NEW.KFGZ.SV.W.0020.210710T2318Z-210710T2345Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Flagstaff AZ
418 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...

* Until 445 PM MST.

* At 418 PM MST, a severe thunderstorm was located 13 miles west of
  Carrizo, or 33 miles southeast of Forest Lakes, and is nearly
  stationary.

  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 County.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Large hail and damaging winds and continuous cloud to ground
lightning is occurring with this storm. Move indoors immediately.
Lightning is one of nature's leading killers. Remember, if you can
hear thunder, you are close enough to be struck by lightning.

&&

LAT...LON 3383 11071 3399 11054 3395 11042 3383 11041
      3382 11042 3383 11051 3385 11057 3381 11065
TIME...MOT...LOC 2318Z 019DEG 3KT 3392 11051 

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

RR

1 follow-up statement

672 
WWUS55 KFGZ 102331
SVSFGZ

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

AZC007-102345-
/O.CON.KFGZ.SV.W.0020.000000T0000Z-210710T2345Z/
Gila-
431 PM MST Sat Jul 10 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 445 PM MST
FOR GILA COUNTY...

At 430 PM MST, a severe thunderstorm was located 14 miles southwest
of Carrizo, or 33 miles southeast of Forest Lakes, and is nearly
stationary.

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.

This severe thunderstorm will remain over mainly rural areas of Gila
County.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Continuous cloud to ground lightning is occurring with this storm.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.

&&

LAT...LON 3383 11071 3399 11054 3395 11042 3383 11041
      3382 11042 3383 11051 3385 11057 3381 11065
TIME...MOT...LOC 2330Z 019DEG 3KT 3391 11051 

HAIL...1.00IN
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, 4:27 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, 4:40 PM MST	Severe Thunderstorm Warning	FGZ	Gila, Navajo	50 min
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.