Alert archive / Arizona / Special Weather Statements in 2021

Special Weather Statement, NWS Flagstaff, AZ

September 9, 2021Coconino County, Arizona

NWS Flagstaff, AZ issued this special weather statement at Sep 9, 2021, 1:21 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
Sep 9, 2021, 1:21 PM MST (20:21 UTC)
Expired
Sep 9, 2021, 1:45 PM MST
In force
24 min
Issued by
NWS Flagstaff, AZ
Hail
0.75 in
Wind
40

County Coconino County, AZ

The radar

The Flagstaff radar (KFSX), 141 km from the middle of the area, began a volume at 20:22 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, 8.4 hours before the alert went out and 50 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-pSkew-T log-p diagram, Flgstf/Belemont, AZ at 12:00Z on 2021-09-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 113 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Flgstf/Belemont, AZ at 12:00Z on 2021-09-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -31 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
113 J/kg
Mixed-layer CIN
-138 J/kg
Mixed-layer LCL
2173 m above ground
0-6 km bulk shear
19 kt
0-1 km storm-relative helicity
-31 m²/s²
0-3 km storm-relative helicity
46 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

588 
WWUS85 KFGZ 092021
SPSFGZ

Special Weather Statement
National Weather Service Flagstaff AZ
121 PM MST Thu Sep 9 2021
 
AZZ007-015-092045-
Western Mogollon Rim-Coconino Plateau-
121 PM MST Thu Sep 9 2021

...A strong thunderstorm will impact portions of Coconino County 
including Valle through 145 PM MST...

At 120 PM MST, Doppler radar was tracking a strong thunderstorm near
Valle, moving northwest at 20 mph.

HAZARD...Winds in excess of 40 mph and penny size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around 
         unsecured objects. Minor damage to outdoor objects is 
         possible.

Locations impacted include...
Valle.

This includes the following highways...
 State Route 64 between mile markers 202 and 220.
 Highway 180 between mile markers 254 and 265.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building. 

&&

LAT...LON 3560 11193 3545 11203 3552 11245 3584 11223
TIME...MOT...LOC 2020Z 117DEG 16KT 3557 11210 

MAX HAIL SIZE...0.75 IN
MAX WIND GUST...40 MPH

$$
JJ

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 9, 4:47 PM MSTSpecial Weather StatementFGZ28 min

Nearby

Special Weather Statements in Arizona, 2021Every special weather statement 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.