Alert archive / Arizona / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 91, NWS Flagstaff, AZ

August 6, 2021Apache County, Navajo County, Arizona

NWS Flagstaff, AZ issued this severe thunderstorm warning at Aug 6, 2021, 12:26 PM MST for Apache County, Navajo County, Arizona. It was in force for 30 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: Aug 6, 2021, 12:26 PM MST (19:26 UTC)
Expired: Aug 6, 2021, 12:56 PM MST
In force: 30 min
Issued by: NWS Flagstaff, AZ
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Apache County, AZ, Navajo County, AZ

The radar

The Flagstaff radar (KFSX), 104 km from the middle of the area, began a volume at 19:27 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, 7.4 hours before the alert went out and 174 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: 39 J/kg
Mixed-layer CIN: -179 J/kg
Mixed-layer LCL: 2177 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 58 m²/s²
0-3 km storm-relative helicity: 28 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

073 
WUUS55 KFGZ 061926
SVRFGZ
AZC001-017-062015-
/O.NEW.KFGZ.SV.W.0091.210806T1926Z-210806T2015Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Flagstaff AZ
1226 PM MST Fri Aug 6 2021

The National Weather Service in Flagstaff has issued a

* Severe Thunderstorm Warning for...
  Apache County in northeastern Arizona...
  Navajo County in north central Arizona...

* Until 115 PM MST.

* At 1225 PM MST, a severe thunderstorm was located 8 miles north of
  Taylor, or 24 miles north of Show Low, moving east 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.

* Locations impacted include...
  Snowflake.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3447 11018 3464 11025 3476 10989 3450 10983
TIME...MOT...LOC 1925Z 253DEG 15KT 3458 11013 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

DB

1 follow-up statement

344 
WWUS55 KFGZ 061956
SVSFGZ

Severe Weather Statement
National Weather Service Flagstaff AZ
1256 PM MST Fri Aug 6 2021

AZC001-017-062005-
/O.CAN.KFGZ.SV.W.0091.000000T0000Z-210806T2015Z/
Apache-Navajo-
1256 PM MST Fri Aug 6 2021

...THE SEVERE THUNDERSTORM WARNING FOR APACHE AND NAVAJO COUNTIES IS
CANCELLED...
    
The severe thunderstorm which prompted the warning has weakened. 
Therefore, the warning has been cancelled.  However gusty winds and 
heavy rain are still possible with this thunderstorm.

To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
Flagstaff.

LAT...LON 3447 11018 3464 11025 3476 10989 3450 10983
TIME...MOT...LOC 1954Z 253DEG 15KT 3462 10998 

$$

DB

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 6, 11:54 AM MST	Special Weather Statement	FGZ		36 min
Aug 6, 12:33 PM MST	Areal Flood Advisory	FGZ	Navajo	2 hr
Aug 6, 1:01 PM MST	Severe Thunderstorm Warning	FGZ	Navajo	44 min
Aug 6, 1:18 PM MST	Areal Flood Advisory	FGZ	Apache	117 min
Aug 6, 1:48 PM MST	Special Weather Statement	FGZ		27 min
Aug 6, 2:25 PM MST	Special Weather Statement	FGZ		50 min
Aug 6, 2:32 PM MST	Special Weather Statement	FGZ	Apache	43 min
Aug 6, 2:39 PM MST	Special Weather Statement	FGZ		36 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.