Alert archive / Arizona / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 34, NWS Flagstaff, AZ

July 12, 2021Coconino County, Gila County, Arizona

NWS Flagstaff, AZ issued this severe thunderstorm warning at Jul 12, 2021, 4:05 PM MST for Coconino County, Gila County, Arizona. It was in force for 25 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 12, 2021, 4:05 PM MST (23:05 UTC)
Expired: Jul 12, 2021, 4:30 PM MST
In force: 25 min
Issued by: NWS Flagstaff, AZ
Area: Storm-based polygon
Hail: 1.75 in
Wind: 70.0 mph

Counties Coconino County, AZ, Gila County, AZ

The radar

The Flagstaff radar (KFSX), 19 km from the middle of the area, began a volume at 23:08 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, 11.1 hours before the alert went out and 108 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: 128 J/kg
Mixed-layer CIN: -217 J/kg
Mixed-layer LCL: 2863 m above ground
0-6 km bulk shear: 12 kt
0-1 km storm-relative helicity: 21 m²/s²
0-3 km storm-relative helicity: 39 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

758 
WUUS55 KFGZ 122305
SVRFGZ
AZC005-007-122330-
/O.NEW.KFGZ.SV.W.0034.210712T2305Z-210712T2330Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Flagstaff AZ
405 PM MST Mon Jul 12 2021

The National Weather Service in Flagstaff has issued a

* Severe Thunderstorm Warning for...
  Gila County in east central Arizona...
  Coconino County in north central Arizona...

* Until 430 PM MST.

* At 405 PM MST, a severe thunderstorm was located 11 miles north of
  Christopher Creek, or 15 miles northwest of Forest Lakes, moving
  west at 10 mph.

  HAZARD...Golf ball size hail and 70 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...People and animals outdoors will be injured. Expect hail 
           damage to roofs, siding, windows, and vehicles. Expect 
           considerable tree damage. Wind damage is also likely to 
           mobile homes, roofs, and outbuildings.

* Locations impacted include...
  Starlight Pines and Knoll Lake Campground. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3457 11088 3438 11096 3441 11120 3464 11112
TIME...MOT...LOC 2305Z 108DEG 10KT 3448 11102 

HAIL...1.75IN
WIND...70MPH
 
$$

1 follow-up statement

644 
WWUS55 KFGZ 122330
SVSFGZ

Severe Weather Statement
National Weather Service Flagstaff AZ
430 PM MST Mon Jul 12 2021

AZC005-007-122338-
/O.EXP.KFGZ.SV.W.0034.000000T0000Z-210712T2330Z/
Gila-Coconino-
430 PM MST Mon Jul 12 2021

...THE SEVERE THUNDERSTORM WARNING FOR GILA AND COCONINO COUNTIES
WILL EXPIRE AT 430 PM MST...
                
The storm which prompted the Severe Thunderstorm Warning north of 
Kohls Ranch has weakened below severe limits and no longer poses an 
immediate threat to life or property. Therefore, the warning will be 
allowed to expire.

LAT...LON 3457 11088 3438 11096 3441 11120 3464 11112
TIME...MOT...LOC 2328Z 108DEG 10KT 3450 11109 

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 12, 1:44 PM MST	Flash Flood Watch	FGZ	Coconino, Gila, Yavapai	39 hr
Jul 12, 1:49 PM MST	Special Weather Statement	FGZ		26 min
Jul 12, 2:03 PM MST	Special Weather Statement	FGZ	Apache	27 min
Jul 12, 2:29 PM MST	Special Weather Statement	FGZ	Apache	31 min
Jul 12, 3:48 PM MST	Severe Thunderstorm Warning	FGZ	Apache, Gila, Navajo	27 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.