Alert archive / Arizona / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 111, NWS Flagstaff, AZ
NWS Flagstaff, AZ issued this severe thunderstorm warning at Aug 15, 2021, 12:52 PM MST for Coconino County, Arizona. It was in force for 38 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
- Aug 15, 2021, 12:52 PM MST (19:52 UTC)
- Expired
- Aug 15, 2021, 1:30 PM MST
- In force
- 38 min
- Issued by
- NWS Flagstaff, AZ
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 50.0 mph
County Coconino County, AZ
The radar
The Flagstaff radar (KFSX), 108 km from the middle of the area, began a volume at 19:55 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, 7.9 hours before the alert went out and 42 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
- 9 J/kg
- Mixed-layer CIN
- -172 J/kg
- Mixed-layer LCL
- 2026 m above ground
- 0-6 km bulk shear
- 13 kt
- 0-1 km storm-relative helicity
- 41 m²/s²
- 0-3 km storm-relative helicity
- 73 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
529
WUUS55 KFGZ 151952
SVRFGZ
AZC005-152030-
/O.NEW.KFGZ.SV.W.0111.210815T1952Z-210815T2030Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Flagstaff AZ
1252 PM MST Sun Aug 15 2021
The National Weather Service in Flagstaff has issued a
* Severe Thunderstorm Warning for...
Coconino County in north central Arizona...
* Until 130 PM MST.
* At 1251 PM MST, a severe thunderstorm was located 12 miles north of
Perkinsville, or 26 miles northeast of Chino Valley, moving
southwest at 10 mph.
HAZARD...Quarter size hail.
SOURCE...Radar indicated.
IMPACT...Damage to vehicles is expected.
* 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.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 3515 11218 3512 11209 3498 11215 3497 11228
3500 11234 3511 11234
TIME...MOT...LOC 1951Z 038DEG 10KT 3508 11220
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...<50 MPH
$$
RR2 follow-up statements
173
WWUS55 KFGZ 152013
SVSFGZ
Severe Weather Statement
National Weather Service Flagstaff AZ
113 PM MST Sun Aug 15 2021
AZC005-152030-
/O.CON.KFGZ.SV.W.0111.000000T0000Z-210815T2030Z/
Coconino-
113 PM MST Sun Aug 15 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 130 PM MST
FOR COCONINO COUNTY...
At 113 PM MST, a severe thunderstorm was located 9 miles north of
Perkinsville, or 22 miles northeast of Chino Valley, moving southwest
at 5 mph.
HAZARD...Quarter size hail.
SOURCE...Radar indicated.
IMPACT...Damage to vehicles is expected.
This severe thunderstorm will remain over mainly rural areas of
Coconino County.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 3513 11217 3512 11209 3498 11215 3500 11225
3504 11227 3509 11225
TIME...MOT...LOC 2013Z 038DEG 10KT 3503 11225
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...<50 MPH
$$
RR107
WWUS55 KFGZ 152023
SVSFGZ
Severe Weather Statement
National Weather Service Flagstaff AZ
123 PM MST Sun Aug 15 2021
AZC005-152033-
/O.EXP.KFGZ.SV.W.0111.000000T0000Z-210815T2030Z/
Coconino-
123 PM MST Sun Aug 15 2021
...THE SEVERE THUNDERSTORM WARNING FOR COCONINO COUNTY WILL EXPIRE AT
130 PM MST...
The storm which prompted the warning has weakened below severe
limits, and has exited the warned area. Therefore, the warning will
be allowed to expire. However small hail is still possible with this
thunderstorm.
LAT...LON 3513 11217 3512 11209 3498 11215 3500 11225
3504 11227 3509 11225
TIME...MOT...LOC 2023Z 038DEG 10KT 3501 11227
$$
RRThe office that day
Everything else NWS Flagstaff, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 15, 12:37 PM MST | Special Weather Statement | FGZ | 23 min | |
| Aug 15, 1:22 PM MST | Severe Thunderstorm Warning | FGZ | Apache | 38 min |
| Aug 15, 1:43 PM MST | Severe Thunderstorm Warning | FGZ | Coconino, Yavapai | 36 min |
| Aug 15, 2:17 PM MST | Severe Thunderstorm Warning | FGZ | Coconino | 43 min |
| Aug 15, 2:33 PM MST | Flash Flood Warning | FGZ | Coconino, Yavapai | 3 hr |
| Aug 15, 2:42 PM MST | Severe Thunderstorm Warning | FGZ | Yavapai | 48 min |
| Aug 15, 3:36 PM MST | Severe Thunderstorm Warning | FGZ | Yavapai | 39 min |
| Aug 15, 3:49 PM MST | Severe Thunderstorm Warning | FGZ | Coconino, Navajo | 26 min |
| Aug 15, 3:52 PM MST | Severe Thunderstorm Warning | FGZ | Navajo | 23 min |
| Aug 15, 4:49 PM MST | Severe Thunderstorm Warning | FGZ | Apache | 41 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.