Alert archive / Arizona / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 35, NWS Flagstaff, AZ
NWS Flagstaff, AZ issued this severe thunderstorm warning at Jul 12, 2021, 5:40 PM MST for Coconino County, Yavapai County, Arizona. It was in force for 35 min. 1 report 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 12, 2021, 5:40 PM MST (00:40 UTC)
- Expired
- Jul 12, 2021, 6:15 PM MST
- In force
- 35 min
- Issued by
- NWS Flagstaff, AZ
- Area
- Storm-based polygon
- Hail
- 0.88 in
- Wind
- 60.0 mph
Counties Coconino County, AZ, Yavapai County, AZ
The radar
The Flagstaff radar (KFSX), 141 km from the middle of the area, began a volume at 00:42 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 12, 5:50 PM MST | HAIL 0.7 | 3 N Ash Fork, AZ |
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 00:00Z, 0.7 hours before the alert went out and 64 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
- 622 J/kg
- Mixed-layer CIN
- -57 J/kg
- Mixed-layer LCL
- 2672 m above ground
- 0-6 km bulk shear
- 17 kt
- 0-1 km storm-relative helicity
- 40 m²/s²
- 0-3 km storm-relative helicity
- 117 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
482 WUUS55 KFGZ 130040 SVRFGZ AZC005-025-130115- /O.NEW.KFGZ.SV.W.0035.210713T0040Z-210713T0115Z/ BULLETIN - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Warning National Weather Service Flagstaff AZ 540 PM MST Mon Jul 12 2021 The National Weather Service in Flagstaff has issued a * Severe Thunderstorm Warning for... Yavapai County in west central Arizona... Coconino County in north central Arizona... * Until 615 PM MST. * At 539 PM MST, a severe thunderstorm was located near Ash Fork and moving moving southeast at 15 mph. HAZARD...60 mph wind gusts and nickel size hail. SOURCE...Radar indicated. IMPACT...Expect damage to roofs, siding, and trees. * Locations impacted include... Ash Fork. PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a building. && LAT...LON 3522 11265 3537 11255 3529 11232 3511 11238 TIME...MOT...LOC 0039Z 298DEG 19KT 3527 11252 HAIL...0.88IN WIND...60MPH $$
2 follow-up statements
908
WWUS55 KFGZ 130102
SVSFGZ
Severe Weather Statement
National Weather Service Flagstaff AZ
602 PM MST Mon Jul 12 2021
AZC005-025-130115-
/O.CON.KFGZ.SV.W.0035.000000T0000Z-210713T0115Z/
Yavapai-Coconino-
602 PM MST Mon Jul 12 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 615 PM MST
FOR YAVAPAI AND COCONINO COUNTIES...
At 601 PM MST, a severe thunderstorm was located near Ash Fork and
moving moving southeast at 20 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect wind damage to
roofs, siding, and trees.
Locations impacted include...
Ash Fork.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3522 11265 3537 11255 3529 11232 3511 11238
TIME...MOT...LOC 0101Z 298DEG 19KT 3521 11239
HAIL...1.00IN
WIND...60MPH
$$482
WWUS55 KFGZ 130115
SVSFGZ
Severe Weather Statement
National Weather Service Flagstaff AZ
615 PM MST Mon Jul 12 2021
AZC005-025-130123-
/O.EXP.KFGZ.SV.W.0035.000000T0000Z-210713T0115Z/
Yavapai-Coconino-
615 PM MST Mon Jul 12 2021
...THE SEVERE THUNDERSTORM WARNING FOR YAVAPAI AND COCONINO COUNTIES
WILL EXPIRE AT 615 PM MST...
The storm which prompted the Severe Thunderstorms Warning near Ash
Fork has weakened below severe limits and no longer poses an
immediate threat to life or property. Therefore, the warning will be
allowed to expire.
However, wind gusts to 50 mph are still possible with this
thunderstorm, especially along I-40 between Ash Fork and Williams
through 645 PM MST.
LAT...LON 3522 11265 3537 11255 3529 11232 3511 11238
TIME...MOT...LOC 0113Z 298DEG 19KT 3518 11233
$$The office that day
Everything else NWS Flagstaff, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| 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 | FGZ | Coconino, Navajo | 3 hr |
| Jul 13, 1:29 PM MST | Flash Flood Warning | 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 | FGZ | Coconino | 2 hr |
| Jul 13, 2:38 PM MST | Flash Flood Warning | 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, 3:27 PM MST | Severe Thunderstorm Warning | FGZ | Yavapai | 33 min |
| Jul 13, 4:14 PM MST | Flash Flood Warning | FGZ | Yavapai | 3 hr |
| Jul 13, 4:25 PM MST | Areal Flood Advisory | FGZ | Coconino, Yavapai | 3 hr |
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.