Alert archive / Arizona / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 68, NWS Flagstaff, AZ

July 24, 2021Apache County, Arizona

NWS Flagstaff, AZ issued this severe thunderstorm warning at Jul 24, 2021, 1:56 PM MST for Apache County, Arizona. It was in force for 34 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 24, 2021, 1:56 PM MST (20:56 UTC)
Expired: Jul 24, 2021, 2:30 PM MST
In force: 34 min
Issued by: NWS Flagstaff, AZ
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Apache County, AZ

The radar

The Flagstaff radar (KFSX), 212 km from the middle of the area, began a volume at 20:59 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, 8.9 hours before the alert went out and 236 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1053 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 13 m²/s²
0-3 km storm-relative helicity: -9 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

914 
WUUS55 KFGZ 242056
SVRFGZ
AZC001-242130-
/O.NEW.KFGZ.SV.W.0068.210724T2056Z-210724T2130Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Flagstaff AZ
256 PM MDT Sat Jul 24 2021

The National Weather Service in Flagstaff has issued a

* Severe Thunderstorm Warning for...
  Apache County in northeastern Arizona...

* Until 330 PM MDT.

* At 254 PM MDT, a severe thunderstorm was located 7 miles northwest
  of Oak Springs Valley, or 26 miles west of Gallup, moving northwest
  at 30 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.

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

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3563 10909 3545 10920 3557 10947 3576 10936
TIME...MOT...LOC 2054Z 120DEG 25KT 3557 10921 

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

TPS

2 follow-up statements

315 
WWUS55 KFGZ 242114
SVSFGZ

Severe Weather Statement
National Weather Service Flagstaff AZ
314 PM MDT Sat Jul 24 2021

AZC001-242130-
/O.CON.KFGZ.SV.W.0068.000000T0000Z-210724T2130Z/
Apache-
314 PM MDT Sat Jul 24 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 330 PM MDT
FOR APACHE COUNTY...

At 314 PM MDT, a severe thunderstorm was located 12 miles northwest
of Oak Springs Valley, or 31 miles west of Gallup, moving west at 15
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.

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

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3566 10916 3549 10926 3557 10947 3576 10936
TIME...MOT...LOC 2114Z 097DEG 13KT 3560 10928 

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

TPS

417 
WWUS55 KFGZ 242128
SVSFGZ

Severe Weather Statement
National Weather Service Flagstaff AZ
328 PM MDT Sat Jul 24 2021

AZC001-242137-
/O.EXP.KFGZ.SV.W.0068.000000T0000Z-210724T2130Z/
Apache-
328 PM MDT Sat Jul 24 2021

...THE SEVERE THUNDERSTORM WARNING FOR APACHE COUNTY WILL EXPIRE AT
330 PM MDT...
                
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 will be allowed to expire.  However small
hail, gusty winds and heavy rain are still possible with this
thunderstorm.

LAT...LON 3566 10916 3549 10926 3557 10947 3576 10936
TIME...MOT...LOC 2127Z 120DEG 25KT 3564 10936 

$$

TPS

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 23, 5:56 PM MST	Severe Thunderstorm Warning	FGZ	Apache	34 min
Jul 23, 6:00 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Coconino	3 hr
Jul 23, 11:13 PM MST	Areal Flood Advisory	FGZ	Apache, Coconino, Gila, Navajo	5 hr
Jul 24, 7:22 AM MST	Areal Flood Advisory	FGZ	Apache, Coconino, Navajo	16 hr
Jul 24, 1:28 PM MST	Severe Thunderstorm Warning	FGZ	Apache	32 min
Jul 24, 2:16 PM MST	Severe Thunderstorm Warning	FGZ	Apache	29 min
Jul 24, 2:43 PM MST	Severe Thunderstorm Warning	FGZ	Apache	32 min
Jul 24, 4:01 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Yavapai	119 min
Jul 24, 4:05 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Apache	3 hr
Jul 24, 4:18 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Apache, Navajo	3 hr
Jul 24, 4:20 PM MST	Severe Thunderstorm Warning	FGZ	Navajo	25 min
Jul 24, 4:51 PM MST	Severe Thunderstorm Warning	FGZ	Navajo	39 min
Jul 24, 4:58 PM MST	Severe Thunderstorm Warning	FGZ	Navajo	32 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.