Alert archive / Arizona / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 52, NWS Flagstaff, AZ

September 8, 2020Gila County, Arizona

NWS Flagstaff, AZ issued this severe thunderstorm warning at Sep 8, 2020, 4:59 PM MST for Gila County, Arizona. It was in force for 21 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Sep 8, 2020, 4:59 PM MST (23:59 UTC)
Expired: Sep 8, 2020, 5:20 PM MST
In force: 21 min
Issued by: NWS Flagstaff, AZ
Area: Storm-based polygon
Hail: 1.25 in
Wind: 60.0 mph

County Gila County, AZ

The radar

The Flagstaff radar (KFSX), 93 km from the middle of the area, began a volume at 00:00 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, 12.0 hours before the alert went out and 183 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: 2338 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 344 m²/s²
0-3 km storm-relative helicity: 367 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Flagstaff, AZ wrote its last area forecast discussion before this severe thunderstorm warning went out at Sep 8, 3:21 PM MST, 1 hour 38 minutes earlier.

Area forecast discussion, Sep 8, 3:21 PM MST, 1 hour 38 minutes before

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In the hours before

Special weather statement, Sep 8, 12:50 PM MST, 4 hours 9 minutes before

Special Weather Statement
National Weather Service Flagstaff AZ
1250 PM MST Tue Sep 8 2020

AZZ012-016-082030-
Little Colorado River Valley in Coconino County-Eastern Mogollon Rim-
1250 PM MST Tue Sep 8 2020

...SIGNIFICANT WEATHER ADVISORY BETWEEN HAPPY JACK AND CLINTS WELL
IN COCONINO COUNTY UNTIL 130 PM MST...

At 1249 PM MST, Doppler radar was tracking a strong thunderstorm 7
miles northwest of Clints Well, or 25 miles east of Camp Verde,
moving east at 35 mph.

Wind gusts of 50 to 55 mph will be possible with this storm.

Locations impacted include...
Clints Well, Starlight Pines, Clints Well Campground, Chevelon Canyon
Dam, Blue Ridge Campground, Rock Crossing Campground, Chevelon Butte
and Chevelon Canyon Lake Campground.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 3449 11150 3469 11152 3481 11085 3441 11080
TIME...MOT...LOC 1949Z 262DEG 32KT 3462 11141

Special weather statement, Sep 8, 2:16 PM MST, 2 hours 43 minutes before

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Special weather statement, Sep 8, 2:41 PM MST, 2 hours 18 minutes before

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Local storm report, Sep 8, 2:43 PM MST, 2 hours 16 minutes before

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Special weather statement, Sep 8, 3:03 PM MST, 1 hour 56 minutes before

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Special weather statement, Sep 8, 3:46 PM MST, 1 hour 13 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 8, 12:50 PM MST	Special Weather Statement	FGZ		40 min
Sep 8, 1:10 PM MST	Severe Thunderstorm Warning	FGZ	Coconino	34 min
Sep 8, 2:16 PM MST	Special Weather Statement	FGZ		44 min
Sep 8, 2:41 PM MST	Special Weather Statement	FGZ		49 min
Sep 8, 3:03 PM MST	Special Weather Statement	FGZ		42 min
Sep 8, 3:46 PM MST	Special Weather Statement	FGZ	Gila	44 min
Sep 8, 3:58 PM MST	Severe Thunderstorm Warning	FGZ	Gila, Navajo	47 min
Sep 8, 4:46 PM MST	Severe Thunderstorm Warning	FGZ	Gila, Navajo	44 min

Nearby

Severe Thunderstorm Warnings in Arizona, 2020 Every severe thunderstorm warning in 2020

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.