Alert archive / Arizona / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 30, NWS Flagstaff, AZ
NWS Flagstaff, AZ issued this severe thunderstorm warning at Jul 11, 2021, 4:25 PM MST for Yavapai County, Arizona. It was in force for 35 min. 3 reports came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Jul 11, 2021, 4:25 PM MST (23:25 UTC)
- Expired
- Jul 11, 2021, 5:00 PM MST
- In force
- 35 min
- Issued by
- NWS Flagstaff, AZ
- Area
- Storm-based polygon
- Hail
- 1.25 in
- Wind
- 70.0 mph
County Yavapai County, AZ
The radar
The Flagstaff radar (KFSX), 120 km from the middle of the area, began a volume at 23:24 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jul 11, 4:30 PM MST | TSTM WND DMG | Prescott, AZ | LAW ENFORCEMENT DISPATCH REPORTED DAMAGE TO THE ROOF OF AN APARTMENT COMPLEX IN PRESCOTT. |
| Jul 11, 5:00 PM MST | TSTM WND DMG | 3 S Chino Valley, AZ | CAR PORT ROOF REPORTEDLY BLOWN OFF THE STRUCTURE AND ON THE GROUND. |
| Jul 11, 5:10 PM MST | TORNADO | 3 S Chino Valley, AZ | TRAINED SPOTTER OBSERVED A TORNADO WEST OF OUTER LOOP ROAD AND SR 89 FOR AROUND 45 SECONDS. INTERMITTENT CLOUD TO GROUND ROTATION WAS CONFIRMED. SPOTTER ID MAA19292. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Flgstf/Belemont, AZ (KFGZ), launched 12:00Z, 11.4 hours before the alert went out and 89 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.
- Mixed-layer CAPE
- 197 J/kg
- Mixed-layer CIN
- -303 J/kg
- Mixed-layer LCL
- 2378 m above ground
- 0-6 km bulk shear
- 13 kt
- 0-1 km storm-relative helicity
- 128 m²/s²
- 0-3 km storm-relative helicity
- 126 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
040
WUUS55 KFGZ 112325
SVRFGZ
AZC025-120000-
/O.NEW.KFGZ.SV.W.0030.210711T2325Z-210712T0000Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Flagstaff AZ
425 PM MST Sun Jul 11 2021
The National Weather Service in Flagstaff has issued a
* Severe Thunderstorm Warning for...
Yavapai County in west central Arizona...
* Until 500 PM MST.
* At 424 PM MST, a severe thunderstorm was located near Prescott
Airport, or near Prescott Valley, moving west at 10 mph.
HAZARD...70 mph wind gusts and half dollar size hail.
SOURCE...Trained spotters and automated observations.
IMPACT...Hail damage to vehicles is expected. Expect considerable
tree damage. Wind damage is also likely to mobile homes,
roofs, and outbuildings.
* Locations impacted include...
Chino Valley, Prescott Valley, Prescott, Yavapai Campground,
Downtown Prescott, Prescott Airport, Williamson Valley, Indian Hill
West Prescott and Iron Springs.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Heavy rainfall is occurring with this storm, and may lead to flash
flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 3477 11243 3458 11234 3446 11262 3483 11271
TIME...MOT...LOC 2324Z 102DEG 8KT 3463 11248
HAIL...1.25IN
WIND...70MPH
$$
RR1 follow-up statement
418
WWUS55 KFGZ 112340
SVSFGZ
Severe Weather Statement
National Weather Service Flagstaff AZ
440 PM MST Sun Jul 11 2021
AZC025-120000-
/O.CON.KFGZ.SV.W.0030.000000T0000Z-210712T0000Z/
Yavapai-
440 PM MST Sun Jul 11 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 500 PM MST
FOR YAVAPAI COUNTY...
At 440 PM MST, a severe thunderstorm was located over Yavapai
Campground, or 8 miles northwest of Prescott Valley, moving west at
10 mph.
HAZARD...70 mph wind gusts and quarter size hail.
SOURCE...Trained weather spotters.
IMPACT...Hail damage to vehicles is expected. Expect considerable
tree damage. Wind damage is also likely to mobile homes,
roofs, and outbuildings.
Locations impacted include...
Chino Valley, Prescott, Yavapai Campground, Williamson Valley and
Iron Springs.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 3473 11245 3462 11243 3452 11263 3483 11271
TIME...MOT...LOC 2340Z 102DEG 8KT 3464 11252
HAIL...1.00IN
WIND...70MPH
$$
RRThe office that day
Everything else NWS Flagstaff, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 10, 5:09 PM MST | Severe Thunderstorm Warning | FGZ | Coconino, Gila, Yavapai | 51 min |
| Jul 10, 5:16 PM MST | Severe Thunderstorm Warning | FGZ | Apache, Coconino, Gila, Navajo | 44 min |
| Jul 10, 5:56 PM MST | Severe Thunderstorm Warning | FGZ | Gila, Yavapai | 49 min |
| Jul 10, 6:23 PM MST | Flash Flood Warning | FGZ | Gila, Navajo | 3 hr |
| Jul 10, 6:44 PM MST | Severe Thunderstorm Warning | FGZ | Gila, Yavapai | 35 min |
| Jul 11, 3:22 PM MST | Special Weather Statement | FGZ | Yavapai | 23 min |
| Jul 11, 3:35 PM MST | Severe Thunderstorm Warning | FGZ | Yavapai | 40 min |
| Jul 11, 3:49 PM MST | Severe Thunderstorm Warning | FGZ | Yavapai | 41 min |
| Jul 11, 4:46 PM MST | Severe Thunderstorm Warning | FGZ | Yavapai | 29 min |
| Jul 11, 4:58 PM MST | Severe Thunderstorm Warning | FGZ | Yavapai | 11 min |
Nearby
Severe Thunderstorm Warnings in Arizona, 2021Every 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.