Alert archive / Arizona / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 8, NWS Phoenix, AZ

August 1, 2020Gila County, Arizona

NWS Phoenix, AZ issued this severe thunderstorm warning at Aug 1, 2020, 4:05 PM MST for Gila County, Arizona. It was in force for 40 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: Aug 1, 2020, 4:05 PM MST (23:05 UTC)
Expired: Aug 1, 2020, 4:45 PM MST
In force: 40 min
Issued by: NWS Phoenix, AZ
Area: Storm-based polygon
Hail: 1.0 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 23:05 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

Tuscon, AZ (KTUS), launched 12:00Z, 11.1 hours before the alert went out and 181 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: 149 J/kg
Mixed-layer CIN: -403 J/kg
Mixed-layer LCL: 2821 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: -29 m²/s²
0-3 km storm-relative helicity: 75 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.9

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 Phoenix, AZ wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 1, 2:59 PM MST, 1 hour 6 minutes earlier.

Area forecast discussion, Aug 1, 2:59 PM MST, 1 hour 6 minutes before

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In the hours before

Special weather statement, Aug 1, 3:45 PM MST, 20 minutes before

Special Weather Statement
National Weather Service Phoenix AZ
345 PM MST Sat Aug 1 2020

AZZ560-563-012330-
Southeast Gila County AZ-San Carlos AZ-
345 PM MST Sat Aug 1 2020

...SIGNIFICANT WEATHER ADVISORY FOR GILA COUNTY UNTIL 430 PM MST...

At 344 PM MST, Doppler radar was tracking a strong thunderstorm 8
miles northeast of San Carlos, or 26 miles east of Globe, moving
southeast at 10 mph.

Half inch hail and wind gusts of 50 to 55 mph will be possible with
this storm.

This storm will remain over mainly rural areas of Gila County.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 3344 11024 3344 11032 3340 11035 3340 11041
      3339 11042 3339 11044 3336 11045 3341 11049
      3352 11024 3346 11018
TIME...MOT...LOC 2244Z 323DEG 9KT 3340 11033

SDB

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 1, 3:45 PM MST	Special Weather Statement	PSR		45 min
Aug 1, 4:14 PM MST	Special Weather Statement	PSR	Gila	46 min
Aug 1, 4:49 PM MST	Severe Thunderstorm Warning	PSR	Gila	41 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.