Alert archive / Arizona / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 176, NWS Flagstaff, AZ

September 27, 2021Coconino County, Arizona

NWS Flagstaff, AZ issued this severe thunderstorm warning at Sep 27, 2021, 4:20 PM MST for Coconino County, Arizona. It was in force for 25 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, 4:20 PM MST (23:20 UTC)
Expired: Sep 27, 2021, 4:45 PM MST
In force: 25 min
Issued by: NWS Flagstaff, AZ
Area: Storm-based polygon
Hail: 1.5 in
Wind: 50.0 mph

County Coconino County, AZ

The radar

The Las Vegas radar (KESX), 182 km from the middle of the area, began a volume at 23:21 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, 11.3 hours before the alert went out and 126 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 917 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 53 m²/s²
0-3 km storm-relative helicity: 82 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

485 
WUUS55 KFGZ 272320
SVRFGZ
AZC005-272345-
/O.NEW.KFGZ.SV.W.0176.210927T2320Z-210927T2345Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Flagstaff AZ
420 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 445 PM MST.

* At 418 PM MST, a severe thunderstorm was located 9 miles east of 
  Laguna Lake, or 20 miles northeast of Fraziers Well, moving south 
  at 10 mph.

  HAZARD...Ping pong ball size hail.

  SOURCE...Radar indicated.

  IMPACT...People and animals outdoors will be injured. Expect 
           damage to roofs, siding, windows, and vehicles.

* Locations impacted include...
  Hualapai Reservation.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 3600 11299 3600 11275 3582 11268 3583 11304
TIME...MOT...LOC 2318Z 015DEG 8KT 3595 11288 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.50 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...<50 MPH

$$

McCollum

1 follow-up statement

629 
WWUS55 KFGZ 272348
SVSFGZ

Severe Weather Statement
National Weather Service Flagstaff AZ
448 PM MST Mon Sep 27 2021

AZC005-272357-
/O.EXP.KFGZ.SV.W.0176.000000T0000Z-210927T2345Z/
Coconino-
448 PM MST Mon Sep 27 2021

...THE SEVERE THUNDERSTORM WARNING FOR COCONINO COUNTY HAS EXPIRED...
                
The storm 20 miles northeast of Fraziers Well which prompted the 
warning has weakened below severe limits. Therefore, the warning has 
been allowed to expire.

LAT...LON 3600 11299 3600 11275 3582 11268 3583 11304
TIME...MOT...LOC 2347Z 015DEG 8KT 3589 11290 

$$

McCollum

The office that day

Everything else NWS Flagstaff, AZ issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Sep 27, 1:36 PM MST	Special Weather Statement	FGZ	Mohave	39 min

Nearby

Severe Thunderstorm Warnings in Arizona, 2021 Every 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.