Alert archive / Arizona / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 93, NWS Flagstaff, AZ
NWS Flagstaff, AZ issued this severe thunderstorm warning at Aug 9, 2021, 4:21 PM MST for Coconino County, Arizona. It was in force for 24 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 9, 2021, 4:21 PM MST (23:21 UTC)
- Expired
- Aug 9, 2021, 4:45 PM MST
- In force
- 24 min
- Issued by
- NWS Flagstaff, AZ
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
County Coconino County, AZ
The radar
The Flagstaff radar (KFSX), 51 km from the middle of the area, began a volume at 23:22 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, 11.4 hours before the alert went out and 51 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 2142 m above ground
- 0-6 km bulk shear
- 9 kt
- 0-1 km storm-relative helicity
- -20 m²/s²
- 0-3 km storm-relative helicity
- -74 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
506
WUUS55 KFGZ 092321
SVRFGZ
AZC005-092345-
/O.NEW.KFGZ.SV.W.0093.210809T2321Z-210809T2345Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Flagstaff AZ
421 PM MST Mon Aug 9 2021
The National Weather Service in Flagstaff has issued a
* Severe Thunderstorm Warning for...
Coconino County in north central Arizona...
* Until 445 PM MST.
* At 421 PM MST, a severe thunderstorm was located 10 miles northeast
of Mormon Lake, or 22 miles southeast of Flagstaff, moving south at
10 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.
* 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.
Large hail and damaging winds and continuous cloud to ground
lightning is occurring with this storm. Move indoors immediately.
Lightning is one of nature's leading killers. Remember, if you can
hear thunder, you are close enough to be struck by lightning.
&&
LAT...LON 3510 11136 3509 11117 3491 11116 3492 11142
TIME...MOT...LOC 2321Z 001DEG 10KT 3501 11129
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
MCT2 follow-up statements
642
WWUS55 KFGZ 092333
SVSFGZ
Severe Weather Statement
National Weather Service Flagstaff AZ
433 PM MST Mon Aug 9 2021
AZC005-092345-
/O.CON.KFGZ.SV.W.0093.000000T0000Z-210809T2345Z/
Coconino-
433 PM MST Mon Aug 9 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 445 PM MST
FOR COCONINO COUNTY...
At 433 PM MST, a severe thunderstorm was located 9 miles east of
Mormon Lake, or 23 miles southeast of Flagstaff, and is nearly
stationary.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect wind damage to
roofs, siding, and trees.
This severe thunderstorm will remain over mainly rural areas of
Coconino County.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Continuous cloud to ground lightning is occurring with this storm.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.
&&
LAT...LON 3510 11136 3509 11117 3491 11116 3492 11142
TIME...MOT...LOC 2333Z 001DEG 10KT 3499 11129
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
MCT624
WWUS55 KFGZ 092343
SVSFGZ
Severe Weather Statement
National Weather Service Flagstaff AZ
443 PM MST Mon Aug 9 2021
AZC005-092352-
/O.EXP.KFGZ.SV.W.0093.000000T0000Z-210809T2345Z/
Coconino-
443 PM MST Mon Aug 9 2021
...THE SEVERE THUNDERSTORM WARNING FOR COCONINO COUNTY WILL EXPIRE AT
445 PM MST...
The storm which prompted the warning 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 small
hail, gusty winds and heavy rain are still possible with this
thunderstorm.
LAT...LON 3510 11136 3509 11117 3491 11116 3492 11142
TIME...MOT...LOC 2342Z 001DEG 10KT 3497 11129
$$
MCTThe office that day
Everything else NWS Flagstaff, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 8, 5:16 PM MST | Special Weather Statement | FGZ | 44 min | |
| Aug 9, 12:30 PM MST | Special Weather Statement | FGZ | Yavapai | 30 min |
| Aug 9, 2:27 PM MST | Flash Flood Warning | FGZ | Yavapai | 2 hr |
| Aug 9, 2:39 PM MST | Flash Flood Warning | FGZ | Yavapai | 3 hr |
| Aug 9, 3:42 PM MST | Flash Flood Warning | FGZ | Yavapai | 3 hr |
| Aug 9, 3:53 PM MST | Flash Flood Warning | FGZ | Coconino | 3 hr |
| Aug 9, 4:15 PM MST | Special Weather Statement | FGZ | 30 min | |
| Aug 9, 4:42 PM MST | Flash Flood Warning | FGZ | Coconino, Gila | 3 hr |
| Aug 9, 4:51 PM MST | Flash Flood Warning | FGZ | Coconino | 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.