Alert archive / Arizona / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 38, NWS Flagstaff, AZ

July 13, 2021Yavapai County, Arizona

NWS Flagstaff, AZ issued this severe thunderstorm warning at Jul 13, 2021, 3:27 PM MST for Yavapai 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 13, 2021, 3:27 PM MST (22:27 UTC)
Expired: Jul 13, 2021, 4:00 PM MST
In force: 33 min
Issued by: NWS Flagstaff, AZ
Area: Storm-based polygon
Hail: 1.25 in
Wind: 60.0 mph

County Yavapai County, AZ

The radar

The Flagstaff radar (KFSX), 51 km from the middle of the area, began a volume at 22:30 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, 10.5 hours before the alert went out and 74 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: 854 J/kg
Mixed-layer CIN: -61 J/kg
Mixed-layer LCL: 1003 m above ground
0-6 km bulk shear: 11 kt
0-1 km storm-relative helicity: -72 m²/s²
0-3 km storm-relative helicity: 195 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

476 
WUUS55 KFGZ 132227
SVRFGZ
AZC025-132300-
/O.NEW.KFGZ.SV.W.0038.210713T2227Z-210713T2300Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Flagstaff AZ
327 PM MST Tue Jul 13 2021

The National Weather Service in Flagstaff has issued a

* Severe Thunderstorm Warning for...
  Yavapai County in west central Arizona...

* Until 400 PM MST.

* At 326 PM MST, a severe thunderstorm was located over Camp Verde,
  and is nearly stationary.

  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...
  Camp Verde, Mcguireville, Montezuma Well, Montezuma Castle National
  Monument, Rimrock, Middle Verde, Lake Montezuma and Clear Creek
  Campgrounds.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3460 11162 3439 11175 3453 11200 3472 11180
TIME...MOT...LOC 2226Z 143DEG 3KT 3454 11182 

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

1 follow-up statement

350 
WWUS55 KFGZ 132257
SVSFGZ

Severe Weather Statement
National Weather Service Flagstaff AZ
357 PM MST Tue Jul 13 2021

AZC025-132305-
/O.EXP.KFGZ.SV.W.0038.000000T0000Z-210713T2300Z/
Yavapai-
357 PM MST Tue Jul 13 2021

...THE SEVERE THUNDERSTORM WARNING FOR YAVAPAI COUNTY WILL EXPIRE AT
400 PM MST...
                
The storm which prompted the Severe Thunderstorm Warning over Camp 
Verde has weakened and no longer poses an immediate threat to life 
or property. Therefore, the warning will be allowed to expire.

Small hail and heavy rain are still occurring, especially south and 
east of Camp Verde and northward to Rimrock.

LAT...LON 3460 11162 3439 11175 3453 11200 3472 11180
TIME...MOT...LOC 2255Z 143DEG 3KT 3456 11184 

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 12, 5:40 PM MST	Severe Thunderstorm Warning	FGZ	Coconino, Yavapai	35 min
Jul 12, 5:56 PM MST	Severe Thunderstorm Warning	FGZ	Coconino	34 min
Jul 12, 7:10 PM MST	Areal Flood Advisory	FGZ	Coconino, Yavapai	3 hr
Jul 13, 12:41 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Coconino, Navajo	3 hr
Jul 13, 1:29 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Coconino	3 hr
Jul 13, 1:57 PM MST	Special Weather Statement	FGZ		33 min
Jul 13, 2:25 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Coconino	2 hr
Jul 13, 2:38 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Coconino	112 min
Jul 13, 2:54 PM MST	Severe Thunderstorm Warning	FGZ	Yavapai	29 min
Jul 13, 3:06 PM MST	Special Weather Statement	FGZ	Yavapai	39 min
Jul 13, 4:14 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Yavapai	3 hr
Jul 13, 4:25 PM MST	Areal Flood Advisory	FGZ	Coconino, Yavapai	3 hr

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.