Alert archive / Arizona / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 103, NWS Flagstaff, AZ

August 13, 2021Gila County, Arizona

NWS Flagstaff, AZ issued this severe thunderstorm warning at Aug 13, 2021, 7:39 PM MST for Gila County, Arizona. It was in force for 26 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 13, 2021, 7:39 PM MST (02:39 UTC)
Expired: Aug 13, 2021, 8:05 PM MST
In force: 26 min
Issued by: NWS Flagstaff, AZ
Area: Storm-based polygon
Hail: 1.0 in
Wind: 50.0 mph

County Gila County, AZ

The radar

The Flagstaff radar (KFSX), 32 km from the middle of the area, began a volume at 02:39 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Aug 13, 6:55 PM MST	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Flgstf/Belemont, AZ (KFGZ), launched 00:00Z, 2.7 hours before the alert went out and 105 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: 430 J/kg
Mixed-layer CIN: -94 J/kg
Mixed-layer LCL: 1694 m above ground
0-6 km bulk shear: 7 kt
0-1 km storm-relative helicity: 22 m²/s²
0-3 km storm-relative helicity: 170 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

030 
WUUS55 KFGZ 140239
SVRFGZ
AZC007-140315-
/O.NEW.KFGZ.SV.W.0103.210814T0239Z-210814T0315Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Flagstaff AZ
739 PM MST Fri Aug 13 2021

The National Weather Service in Flagstaff has issued a

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

* Until 815 PM MST.

* At 738 PM MST, a severe thunderstorm was located near Pine, or 8
  miles northwest of Payson, moving west at 10 mph.

  HAZARD...Quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Damage to vehicles is expected.

* Locations impacted include...
  Tonto Natural Bridge State Park.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3437 11138 3433 11136 3429 11145 3436 11148
TIME...MOT...LOC 0238Z 070DEG 7KT 3434 11142 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...<50 MPH

$$

McCollum

2 follow-up statements

875 
WWUS55 KFGZ 140251
SVSFGZ

Severe Weather Statement
National Weather Service Flagstaff AZ
751 PM MST Fri Aug 13 2021

AZC007-140315-
/O.CON.KFGZ.SV.W.0103.000000T0000Z-210814T0315Z/
Gila-
751 PM MST Fri Aug 13 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 815 PM MST
FOR GILA COUNTY...

At 751 PM MST, a severe thunderstorm was located near Pine, or 9
miles northwest of Payson, moving west at 10 mph.

HAZARD...Quarter size hail.

SOURCE...Radar indicated.

IMPACT...Damage to vehicles is expected.

Locations impacted include...
Tonto Natural Bridge State Park.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3437 11138 3433 11136 3429 11145 3436 11148
TIME...MOT...LOC 0251Z 070DEG 7KT 3433 11145 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...<50 MPH

$$

McCollum

193 
WWUS55 KFGZ 140305
SVSFGZ

Severe Weather Statement
National Weather Service Flagstaff AZ
805 PM MST Fri Aug 13 2021

AZC007-140314-
/O.CAN.KFGZ.SV.W.0103.000000T0000Z-210814T0315Z/
Gila-
805 PM MST Fri Aug 13 2021

...THE SEVERE THUNDERSTORM WARNING FOR GILA COUNTY IS CANCELLED...
                
The storm south of Pine which prompted the warning has weakened 
below severe limits, and no longer poses an immediate threat to life 
or property. Therefore, the warning has been cancelled.

A Severe Thunderstorm Watch remains in effect until 300 AM MST for
east central Arizona.

LAT...LON 3437 11138 3433 11136 3429 11145 3436 11148
TIME...MOT...LOC 0300Z 070DEG 7KT 3432 11148 

$$

McCollum

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 13, 5:41 PM MST	Severe Thunderstorm Warning	FGZ	Yavapai	21 min
Aug 13, 6:09 PM MST	Severe Thunderstorm Warning	FGZ	Coconino	25 min
Aug 13, 6:18 PM MST	Severe Thunderstorm Warning	FGZ	Yavapai	27 min
Aug 13, 7:00 PM MST	Severe Thunderstorm Warning	FGZ	Yavapai	15 min
Aug 13, 8:09 PM MST	Severe Thunderstorm Warning	FGZ	Coconino	36 min
Aug 13, 8:15 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Gila, Yavapai	2 hr
Aug 13, 8:38 PM MST	Severe Thunderstorm Warning	FGZ	Gila, Yavapai	52 min
Aug 13, 9:03 PM MST	Severe Thunderstorm Warning	FGZ	Yavapai	42 min
Aug 13, 9:43 PM MST	Severe Thunderstorm Warning	FGZ	Yavapai	47 min
Aug 13, 9:51 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Yavapai	3 hr
Aug 13, 10:07 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Yavapai	53 min
Aug 14, 3:06 PM MST	Severe Thunderstorm Warning	FGZ	Gila	39 min
Aug 14, 3:42 PM MST	Severe Thunderstorm Warning	FGZ	Gila, Navajo	36 min
Aug 14, 3:58 PM MST	Severe Thunderstorm Warning	FGZ	Gila	29 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.