Alert archive / Arizona / Special Weather Statements in 2021

Special Weather Statement, NWS Flagstaff, AZ

August 6, 2021

NWS Flagstaff, AZ issued this special weather statement at Aug 6, 2021, 1:48 PM MST. It was in force for 27 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 6, 2021, 1:48 PM MST (20:48 UTC)
Expired: Aug 6, 2021, 2:15 PM MST
In force: 27 min
Issued by: NWS Flagstaff, AZ
Hail: 0.50 in
Wind: 50

The radar

The Flagstaff radar (KFSX), 67 km from the middle of the area, began a volume at 20:48 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, 8.8 hours before the alert went out and 27 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: 39 J/kg
Mixed-layer CIN: -179 J/kg
Mixed-layer LCL: 2177 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 58 m²/s²
0-3 km storm-relative helicity: 28 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

784 
WWUS85 KFGZ 062048
SPSFGZ

Special Weather Statement
National Weather Service Flagstaff AZ
148 PM MST Fri Aug 6 2021
 
AZZ015-038-062115-
Western Mogollon Rim-Oak Creek and Sycamore Canyons-
148 PM MST Fri Aug 6 2021

...A strong thunderstorm will impact portions of Yavapai and Coconino
Counties through 215 PM MST...

At 147 PM MST, Doppler radar was tracking a strong thunderstorm over
Junipine Resort, or 10 miles north of Sedona, moving east at 20 mph.

HAZARD...Wind gusts up to 50 mph and half inch 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...
Flagstaff, Munds Park, Junipine Resort, Garland's Oak Creek Lodge,
Kachina Village, Slide Rock State Park, Mountainaire, West Fork Of
Oak Creek, Cave Springs Campground, Pine Flat Campground, Upper Lake
Mary Boat Ramps, Manzanita Campground, Sterling Fish Hatchery, Lower
Lake Mary, Canyon Vista Campground and Upper Lake Mary.

This includes the following highways...
 Interstate 17 between mile markers 323 and 337.
 State Route 89A between mile markers 380 and 398.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building. 

Torrential rainfall is also occurring with this storm and may lead to
localized flooding. Do not drive your vehicle through flooded
roadways.

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 3491 11182 3505 11190 3518 11157 3496 11146
TIME...MOT...LOC 2047Z 248DEG 19KT 3500 11174 

MAX HAIL SIZE...0.50 IN
MAX WIND GUST...50 MPH

$$

DB

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 6, 11:54 AM MST	Special Weather Statement	FGZ		36 min
Aug 6, 12:26 PM MST	Severe Thunderstorm Warning	FGZ	Apache, Navajo	30 min
Aug 6, 12:33 PM MST	Areal Flood Advisory	FGZ	Navajo	2 hr
Aug 6, 1:01 PM MST	Severe Thunderstorm Warning	FGZ	Navajo	44 min
Aug 6, 1:18 PM MST	Areal Flood Advisory	FGZ	Apache	117 min
Aug 6, 2:25 PM MST	Special Weather Statement	FGZ		50 min
Aug 6, 2:32 PM MST	Special Weather Statement	FGZ	Apache	43 min
Aug 6, 2:39 PM MST	Special Weather Statement	FGZ		36 min

Nearby

Special Weather Statements in Arizona, 2021 Every 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.