Alert archive / Arizona / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 3, NWS Flagstaff, AZ

June 29, 2021Coconino County, Arizona

NWS Flagstaff, AZ issued this severe thunderstorm warning at Jun 29, 2021, 11:34 AM MST for Coconino 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: Jun 29, 2021, 11:34 AM MST (18:34 UTC)
Expired: Jun 29, 2021, 12:00 PM MST
In force: 26 min
Issued by: NWS Flagstaff, AZ
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Coconino County, AZ

The radar

The Cedar City radar (KICX), 124 km from the middle of the area, began a volume at 18:35 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, 6.6 hours before the alert went out and 156 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: 225 J/kg
Mixed-layer CIN: -162 J/kg
Mixed-layer LCL: 1570 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: -75 m²/s²
0-3 km storm-relative helicity: -28 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.1

Open this sounding in Storm Lab

The text

As transmitted.

503 
WUUS55 KFGZ 291834
SVRFGZ
AZC005-291900-
/O.NEW.KFGZ.SV.W.0003.210629T1834Z-210629T1900Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Flagstaff AZ
1134 AM MST Tue Jun 29 2021

The National Weather Service in Flagstaff has issued a

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

* Until noon MST.

* At 1133 AM MST, a severe thunderstorm was located 10 miles
  southwest of Jacob Lake, or 32 miles south of Kanab, moving
  southeast at 10 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.

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

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3657 11248 3670 11233 3662 11205 3635 11232
TIME...MOT...LOC 1833Z 313DEG 7KT 3659 11234 

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

ET

1 follow-up statement

286 
WWUS55 KFGZ 291853
SVSFGZ

Severe Weather Statement
National Weather Service Flagstaff AZ
1153 AM MST Tue Jun 29 2021

AZC005-291902-
/O.EXP.KFGZ.SV.W.0003.000000T0000Z-210629T1900Z/
Coconino-
1153 AM MST Tue Jun 29 2021

...THE SEVERE THUNDERSTORM WARNING FOR COCONINO COUNTY WILL EXPIRE AT
NOON MST...
                
The storm which prompted the warning has weakened below severe 
limits but remains strong.The warning will be allowed to expire. 
However, dime to penny size hail and gusty winds are still possible 
with this thunderstorm.

LAT...LON 3657 11248 3670 11233 3662 11205 3635 11232
TIME...MOT...LOC 1852Z 313DEG 7KT 3658 11232 

$$

ET

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 29, 11:56 AM MST	Flash Flood Warning Considerable damage threat	FGZ	Coconino, Yavapai	3 hr
Jun 29, 1:05 PM MST	Areal Flood Advisory	FGZ	Coconino, Yavapai	3 hr
Jun 29, 1:58 PM MST	Severe Thunderstorm Warning	FGZ	Yavapai	32 min
Jun 29, 2:24 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Gila	3 hr
Jun 29, 3:03 PM MST	Severe Thunderstorm Warning	FGZ	Coconino	42 min
Jun 29, 3:39 PM MST	Severe Thunderstorm Warning	FGZ	Coconino	36 min
Jun 29, 3:49 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Coconino	3 hr
Jun 29, 4:07 PM MST	Special Weather Statement	FGZ	Gila	23 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.