Alert archive / Arizona / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 83, NWS Flagstaff, AZ

July 29, 2021Yavapai County, Arizona

NWS Flagstaff, AZ issued this severe thunderstorm warning at Jul 29, 2021, 2:41 PM MST for Yavapai County, Arizona. It was in force for 34 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 29, 2021, 2:41 PM MST (21:41 UTC)
Expired: Jul 29, 2021, 3:15 PM MST
In force: 34 min
Issued by: NWS Flagstaff, AZ
Area: Storm-based polygon
Hail: 1.25 in
Wind: 50.0 mph

County Yavapai County, AZ

The radar

The Flagstaff radar (KFSX), 97 km from the middle of the area, began a volume at 21:44 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, 9.7 hours before the alert went out and 92 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: 156 J/kg
Mixed-layer CIN: -113 J/kg
Mixed-layer LCL: 1821 m above ground
0-6 km bulk shear: 15 kt
0-1 km storm-relative helicity: 37 m²/s²
0-3 km storm-relative helicity: 35 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

879 
WUUS55 KFGZ 292141
SVRFGZ
AZC025-292215-
/O.NEW.KFGZ.SV.W.0083.210729T2141Z-210729T2215Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Flagstaff AZ
241 PM MST Thu Jul 29 2021

The National Weather Service in Flagstaff has issued a

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

* Until 315 PM MST.

* At 240 PM MST, a severe thunderstorm was located over Poland
  Junction, or 9 miles southeast of Prescott Valley, moving northwest
  at 10 mph.

  HAZARD...Half dollar size hail.

  SOURCE...Radar indicated.

  IMPACT...Damage to vehicles is expected.

* Locations impacted include...
  Southern Prescott Valley, Dewey-humboldt and Poland Junction. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3450 11216 3441 11225 3447 11240 3458 11231
TIME...MOT...LOC 2140Z 134DEG 8KT 3448 11227 

HAIL...1.25IN
WIND...<50MPH
 
$$

1 follow-up statement

029 
WWUS55 KFGZ 292215
SVSFGZ

Severe Weather Statement
National Weather Service Flagstaff AZ
315 PM MST Thu Jul 29 2021

AZC025-292223-
/O.EXP.KFGZ.SV.W.0083.000000T0000Z-210729T2215Z/
Yavapai-
315 PM MST Thu Jul 29 2021

...THE SEVERE THUNDERSTORM WARNING FOR YAVAPAI COUNTY WILL EXPIRE AT
315 PM MST...
                
The thunderstorm which prompted the Severe Thunderstorm Warning near 
Poland Junction has weakened. Therefore, the warning will be allowed 
to expire.

However, small hail and very heavy rain are still possible with this 
thunderstorm as it moves toward Prescott Valley and Prescott.

LAT...LON 3450 11216 3441 11225 3447 11240 3458 11231
TIME...MOT...LOC 2213Z 134DEG 8KT 3453 11233 

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 28, 6:47 PM MST	Special Weather Statement	FGZ		28 min
Jul 28, 7:06 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Navajo	3 hr
Jul 28, 7:18 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Navajo	3 hr
Jul 29, 11:48 AM MST	Flash Flood Warning Considerable damage threat	FGZ	Apache	3 hr
Jul 29, 11:57 AM MST	Severe Thunderstorm Warning	FGZ	Apache, Navajo	33 min
Jul 29, 12:21 PM MST	Severe Thunderstorm Warning	FGZ	Apache	24 min
Jul 29, 12:36 PM MST	Severe Thunderstorm Warning	FGZ	Coconino	24 min
Jul 29, 12:44 PM MST	Severe Thunderstorm Warning	FGZ	Apache	31 min
Jul 29, 12:53 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Apache	3 hr
Jul 29, 12:57 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Apache, Navajo	3 hr
Jul 29, 1:07 PM MST	Severe Thunderstorm Warning	FGZ	Apache, Navajo	38 min
Jul 29, 1:10 PM MST	Severe Thunderstorm Warning	FGZ	Apache	50 min
Jul 29, 1:13 PM MST	Severe Thunderstorm Warning	FGZ	Apache	32 min
Jul 29, 1:23 PM MST	Severe Thunderstorm Warning	FGZ	Yavapai	37 min
Jul 29, 2:05 PM MST	Flash Flood Watch	FGZ	Apache, Coconino, Navajo, Yavapai	31 hr
Jul 29, 2:09 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Yavapai	3 hr
Jul 29, 2:16 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Apache, Navajo	3 hr
Jul 29, 3:03 PM MST	Severe Thunderstorm Warning	FGZ	Apache, Navajo	27 min
Jul 29, 3:41 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Coconino, Navajo	3 hr
Jul 29, 4:03 PM MST	Flash Flood Warning Considerable damage threat	FGZ	Coconino	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.