Alert archive / Arizona / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 53, NWS Flagstaff, AZ

July 18, 2021Gila County, Navajo County, Arizona

NWS Flagstaff, AZ issued this severe thunderstorm warning at Jul 18, 2021, 2:12 PM MST for Gila County, Navajo County, Arizona. It was in force for 33 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 18, 2021, 2:12 PM MST (21:12 UTC)
Expired: Jul 18, 2021, 2:45 PM MST
In force: 33 min
Issued by: NWS Flagstaff, AZ
Area: Storm-based polygon
Hail: 1.25 in
Wind: 60.0 mph

Counties Gila County, AZ, Navajo County, AZ

The radar

The Flagstaff radar (KFSX), 87 km from the middle of the area, began a volume at 21:11 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 12:00Z, 9.2 hours before the alert went out and 157 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: 453 J/kg
Mixed-layer CIN: -202 J/kg
Mixed-layer LCL: 2153 m above ground
0-6 km bulk shear: 14 kt
0-1 km storm-relative helicity: 7 m²/s²
0-3 km storm-relative helicity: 40 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.4

Open this sounding in Storm Lab

The text

As transmitted.

019 
WUUS55 KFGZ 182112
SVRFGZ
AZC007-017-182145-
/O.NEW.KFGZ.SV.W.0053.210718T2112Z-210718T2145Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Flagstaff AZ
212 PM MST Sun Jul 18 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 245 PM MST.

* At 211 PM MST, a severe thunderstorm was located 14 miles northwest
  of Carrizo, or 23 miles southeast of Forest Lakes, moving northwest
  at 10 mph.

  HAZARD...60 mph wind gusts and half dollar size hail.

  SOURCE...Radar indicated.

  IMPACT...Hail damage to vehicles is expected. Expect wind damage 
           to roofs, siding, and trees.

* Locations impacted include...
  Cibecue.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3405 11032 3400 11052 3409 11068 3421 11045
TIME...MOT...LOC 2111Z 127DEG 10KT 3409 11051 

HAIL...1.25IN
WIND...60MPH
 
$$

ET

2 follow-up statements

501 
WWUS55 KFGZ 182122
SVSFGZ

Severe Weather Statement
National Weather Service Flagstaff AZ
222 PM MST Sun Jul 18 2021

AZC007-182131-
/O.CAN.KFGZ.SV.W.0053.000000T0000Z-210718T2145Z/
Gila-
222 PM MST Sun Jul 18 2021

...THE SEVERE THUNDERSTORM WARNING FOR GILA COUNTY IS CANCELLED...
    
The severe thunderstorm which prompted the warning has weakend. 
Therefore, the warning has been cancelled.

LAT...LON 3409 11042 3401 11054 3409 11068 3421 11045
TIME...MOT...LOC 2121Z 127DEG 10KT 3411 11054 

$$

AZC017-182145-
/O.CON.KFGZ.SV.W.0053.000000T0000Z-210718T2145Z/
Navajo-
222 PM MST Sun Jul 18 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 245 PM MST
FOR NAVAJO COUNTY...

At 221 PM MST, a severe thunderstorm was located 16 miles northwest
of Carrizo, or 21 miles southeast of Forest Lakes, moving northwest
at 10 mph.

HAZARD...60 mph wind gusts and half dollar size hail.

SOURCE...Radar indicated.

IMPACT...Hail damage to vehicles is expected. Expect wind damage to 
         roofs, siding, and trees.

This severe thunderstorm will remain over mainly rural areas of
Navajo County.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3409 11042 3401 11054 3409 11068 3421 11045
TIME...MOT...LOC 2121Z 127DEG 10KT 3411 11054 

HAIL...1.25IN
WIND...60MPH
 
$$

ET

335 
WWUS55 KFGZ 182136
SVSFGZ

Severe Weather Statement
National Weather Service Flagstaff AZ
236 PM MST Sun Jul 18 2021

AZC017-182145-
/O.EXP.KFGZ.SV.W.0053.000000T0000Z-210718T2145Z/
Navajo-
236 PM MST Sun Jul 18 2021

...THE SEVERE THUNDERSTORM WARNING FOR NAVAJO COUNTY WILL EXPIRE AT
245 PM MST...
    
The severe thunderstorm which prompted the warning has moved 
northward. Therefore, the warning will be allowed to expire. A new 
Severe Thunderstorm Warning has been reissued for the north portion 
of this warning. Large hail and heavy rain are still possible with 
this thunderstorm.

LAT...LON 3409 11042 3401 11054 3409 11068 3421 11045
TIME...MOT...LOC 2135Z 127DEG 10KT 3412 11056 

$$

ET

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 18, 10:58 AM MST	Severe Thunderstorm Warning	FGZ	Yavapai	32 min
Jul 18, 11:14 AM MST	Flash Flood Warning Considerable damage threat	FGZ	Yavapai	3 hr
Jul 18, 12:16 PM MST	Severe Thunderstorm Warning	FGZ	Coconino	29 min
Jul 18, 1:03 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Navajo	3 hr
Jul 18, 1:08 PM MST	Special Weather Statement	FGZ		37 min
Jul 18, 1:34 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Coconino	3 hr
Jul 18, 2:18 PM MST	Severe Thunderstorm Warning	FGZ	Gila	42 min
Jul 18, 2:31 PM MST	Areal Flood Advisory	FGZ	Coconino	100 min
Jul 18, 2:33 PM MST	Severe Thunderstorm Warning	FGZ	Navajo	42 min
Jul 18, 2:53 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Gila, Navajo	102 min
Jul 18, 3:02 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Coconino	108 min
Jul 18, 3:47 PM MST	Severe Thunderstorm Warning	FGZ	Gila	43 min
Jul 18, 3:54 PM MST	Special Weather Statement	FGZ		51 min
Jul 18, 4:10 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Yavapai	51 min
Jul 18, 4:32 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Navajo	4 hr
Jul 18, 4:59 PM MST	Severe Thunderstorm Warning	FGZ	Gila, Yavapai	46 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.