Alert archive / Arizona / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 69, NWS Flagstaff, AZ

July 24, 2021Apache County, Arizona

NWS Flagstaff, AZ issued this severe thunderstorm warning at Jul 24, 2021, 2:16 PM MST for Apache County, Arizona. It was in force for 29 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, 2:16 PM MST (21:16 UTC)
Expired: Jul 24, 2021, 2:45 PM MST
In force: 29 min
Issued by: NWS Flagstaff, AZ
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Apache County, AZ

The nearest sounding before it

Grand Junction, CO (KGJT), launched 12:00Z, 9.3 hours before the alert went out and 262 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: 19 J/kg
Mixed-layer CIN: -266 J/kg
Mixed-layer LCL: 1844 m above ground
0-6 km bulk shear: 5 kt
0-1 km storm-relative helicity: 40 m²/s²
0-3 km storm-relative helicity: 94 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

808 
WUUS55 KFGZ 242116
SVRFGZ
AZC001-242145-
/O.NEW.KFGZ.SV.W.0069.210724T2116Z-210724T2145Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Flagstaff AZ
316 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 345 PM MDT.

* At 316 PM MDT, a severe thunderstorm was located near Twin Falls,
  or 17 miles west of Shiprock, moving west at 25 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...
  Twin Falls.

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 3691 10904 3668 10905 3668 10939 3700 10927
TIME...MOT...LOC 2116Z 101DEG 24KT 3679 10902 

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

TPS

1 follow-up statement

678 
WWUS55 KFGZ 242147
SVSFGZ

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

AZC001-242154-
/O.EXP.KFGZ.SV.W.0069.000000T0000Z-210724T2145Z/
Apache-
347 PM MDT Sat Jul 24 2021

...THE SEVERE THUNDERSTORM WARNING FOR APACHE COUNTY WILL EXPIRE AT
345 PM MDT...
    
The severe thunderstorm which prompted the warning remains dangerous 
and a new Severe Thunderstorm Warning is in effect. The new Severe 
Thunderstorm Warning has been issued for the Twin Falls, Red Mesa, 
Totacon, and Teec Nos Pos area. Quarter size hail, gusty winds and 
heavy rain are still possible with this thunderstorm.

LAT...LON 3691 10904 3668 10905 3668 10939 3700 10927
TIME...MOT...LOC 2144Z 101DEG 24KT 3682 10924 

$$

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, 1:56 PM MST	Severe Thunderstorm Warning	FGZ	Apache	34 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.