Alert archive / Arizona / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 178, NWS Flagstaff, AZ
NWS Flagstaff, AZ issued this severe thunderstorm warning at Sep 27, 2021, 6:10 PM MST for Coconino County, Arizona. It was in force for 18 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
- Sep 27, 2021, 6:10 PM MST (01:10 UTC)
- Expired
- Sep 27, 2021, 6:28 PM MST
- In force
- 18 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 Cedar City radar (KICX), 116 km from the middle of the area, began a volume at 01:12 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 00:00Z, 1.2 hours before the alert went out and 163 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
- 177 J/kg
- Mixed-layer CIN
- -40 J/kg
- Mixed-layer LCL
- 849 m above ground
- 0-6 km bulk shear
- 20 kt
- 0-1 km storm-relative helicity
- 80 m²/s²
- 0-3 km storm-relative helicity
- 125 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
665 WUUS55 KFGZ 280110 SVRFGZ AZC005-280145- /O.NEW.KFGZ.SV.W.0178.210928T0110Z-210928T0145Z/ BULLETIN - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Warning National Weather Service Flagstaff AZ 610 PM MST Mon Sep 27 2021 The National Weather Service in Flagstaff has issued a * Severe Thunderstorm Warning for... Coconino County in north central Arizona... * Until 645 PM MST. * At 610 PM MST, a severe thunderstorm was located 12 miles southwest of Jacob Lake, moving southwest at 15 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. && LAT...LON 3668 11241 3663 11229 3649 11234 3659 11255 TIME...MOT...LOC 0110Z 030DEG 16KT 3661 11240 HAIL THREAT...RADAR INDICATED MAX HAIL SIZE...1.00 IN WIND THREAT...RADAR INDICATED MAX WIND GUST...<50 MPH $$ McCollum
1 follow-up statement
886
WWUS55 KFGZ 280128
SVSFGZ
Severe Weather Statement
National Weather Service Flagstaff AZ
628 PM MST Mon Sep 27 2021
AZC005-280136-
/O.CAN.KFGZ.SV.W.0178.000000T0000Z-210928T0145Z/
Coconino-
628 PM MST Mon Sep 27 2021
...THE SEVERE THUNDERSTORM WARNING FOR COCONINO COUNTY IS
CANCELLED...
The storm 12 miles southwest of Jacobs Lake which prompted the
warning has weakened below severe limits, and no longer poses an
immediate threat to life or property. Therefore, the warning has
been cancelled.
LAT...LON 3668 11241 3663 11229 3649 11234 3659 11255
TIME...MOT...LOC 0121Z 030DEG 16KT 3655 11245
$$
McCollumThe office that day
Everything else NWS Flagstaff, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 27, 5:29 PM MST | Flash Flood Warning | FGZ | Yavapai | 3 hr |
| Sep 27, 5:41 PM MST | Severe Thunderstorm Warning | FGZ | Coconino | 34 min |
| Sep 27, 6:14 PM MST | Flash Flood Warning | FGZ | Coconino | 2 hr |
| Sep 28, 2:35 PM MST | Special Weather Statement | FGZ | 25 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.