Alert archive / Arizona / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 87, NWS Flagstaff, AZ

August 1, 2021Gila County, Navajo County, Arizona

NWS Flagstaff, AZ issued this severe thunderstorm warning at Aug 1, 2021, 5:11 PM MST for Gila County, Navajo County, Arizona. It was in force for 49 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 1, 2021, 5:11 PM MST (00:11 UTC)
Expired: Aug 1, 2021, 6:00 PM MST
In force: 49 min
Issued by: NWS Flagstaff, AZ
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Gila County, AZ, Navajo County, AZ

The radar

The Flagstaff radar (KFSX), 116 km from the middle of the area, began a volume at 00:11 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

Phoenix, AZ (KPSR), launched 00:00Z, 0.2 hours before the alert went out and 171 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: 748 J/kg
Mixed-layer CIN: -58 J/kg
Mixed-layer LCL: 2842 m above ground
0-6 km bulk shear: 12 kt
0-1 km storm-relative helicity: -2 m²/s²
0-3 km storm-relative helicity: 6 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

247 
WUUS55 KFGZ 020011
SVRFGZ
AZC007-017-020100-
/O.NEW.KFGZ.SV.W.0087.210802T0011Z-210802T0100Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Flagstaff AZ
511 PM MST Sun Aug 1 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 600 PM MST.

* At 510 PM MST, a severe thunderstorm was located 9 miles east of
  Hondah, or 19 miles southeast of Show Low.

  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...
  Fort Apache Reservation, Carrizo, Cedar Creek and White Mountain
  Apache Reservation.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3380 11023 3387 11044 3408 11020 3401 11000
TIME...MOT...LOC 0010Z 240DEG 48KT 3408 10977 

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

DB

1 follow-up statement

726 
WWUS55 KFGZ 020055
SVSFGZ

Severe Weather Statement
National Weather Service Flagstaff AZ
555 PM MST Sun Aug 1 2021

AZC007-017-020105-
/O.EXP.KFGZ.SV.W.0087.000000T0000Z-210802T0100Z/
Gila-Navajo-
555 PM MST Sun Aug 1 2021

...THE SEVERE THUNDERSTORM WARNING FOR GILA AND NAVAJO COUNTIES WILL
EXPIRE AT 600 PM MST...
                
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 heavy rain
is 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 3380 11023 3387 11044 3408 11020 3401 11000
TIME...MOT...LOC 0055Z 240DEG 48KT 3436 10919 

$$

DB

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 1, 5:05 PM MST	Areal Flood Advisory	FGZ	Coconino	3 hr
Aug 1, 5:22 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Coconino	3 hr
Aug 1, 5:28 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Gila, Navajo	5 hr
Aug 1, 5:49 PM MST	Areal Flood Advisory	FGZ	Coconino	3 hr
Aug 1, 5:49 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Apache, Navajo	3 hr
Aug 1, 6:04 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Coconino	3 hr
Aug 1, 6:20 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Gila, Navajo	3 hr
Aug 1, 7:55 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Gila	2 hr
Aug 1, 8:26 PM MST	Flash Flood Warning	FGZ	Gila	115 min
Aug 1, 8:59 PM MST	Flash Flood Warning	FGZ	Gila	85 min
Aug 1, 9:47 PM MST	Special Weather Statement	FGZ		28 min
Aug 2, 1:59 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Apache	3 hr
Aug 2, 2:23 PM MST	Severe Thunderstorm Warning	FGZ	Apache, Navajo	22 min
Aug 2, 2:44 PM MST	Severe Thunderstorm Warning	FGZ	Apache, Navajo	31 min
Aug 2, 4:06 PM MST	Special Weather Statement	FGZ	Apache	39 min
Aug 2, 4:14 PM MST	Special Weather Statement	FGZ		31 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.