Alert archive / Arizona / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 25, NWS Phoenix, AZ

July 29, 2018Gila County, Pinal County, Arizona

NWS Phoenix, AZ issued this severe thunderstorm warning at Jul 29, 2018, 5:07 PM MST for Gila County, Pinal County, Arizona. It was in force for 38 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: Jul 29, 2018, 5:07 PM MST (00:07 UTC)
Expired: Jul 29, 2018, 5:45 PM MST
In force: 38 min
Issued by: NWS Phoenix, AZ
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Gila County, AZ, Pinal County, AZ

The radar

The Phoenix radar (KIWA), 55 km from the middle of the area, began a volume at 00:08 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

Phoenix, AZ (KPSR), launched 00:00Z, 0.1 hours before the alert went out and 83 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: 562 J/kg
Mixed-layer CIN: -126 J/kg
Mixed-layer LCL: 2309 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 14 m²/s²
0-3 km storm-relative helicity: 84 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 Phoenix, AZ wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 29, 2:22 PM MST, 2 hours 45 minutes earlier.

Area forecast discussion, Jul 29, 2:22 PM MST, 2 hours 45 minutes before

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In the hours before

Local storm report, Jul 29, 1:10 PM MST, 3 hours 57 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PHOENIX AZ
110 PM MST SUN JUL 29 2018

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1030 PM     TSTM WND DMG     15 NE PARKER            34.29N 114.10W
07/28/2018                   LA PAZ             AZ   TRAINED SPOTTER

            STORM SPOTTER SAYS SOME ROOF SHINGLES ARE
            BLOWN OFF AND SOME POWER LINES ARE DOWN DUE
            TO THE OUTFLOW WINDS LAST NIGHT.

&&

BH

Special weather statement, Jul 29, 4:25 PM MST, 42 minutes before

Special Weather Statement
National Weather Service Phoenix AZ
425 PM MST SUN JUL 29 2018

AZZ556-558-560-562-563-300015-
Southeast Gila County AZ-Tonto Basin AZ-San Carlos AZ-Globe/Miami AZ-
Pinal/Superstition Mountains AZ-
425 PM MST SUN JUL 29 2018

...SIGNIFICANT WEATHER ADVISORY FOR GILA...MARICOPA AND PINAL
COUNTIES UNTIL 515 PM MST...

At 424 PM MST, Doppler radar was tracking strong thunderstorms along
a line extending from 7 miles east of Tonto National Monument to near
San Carlos. Movement was southwest at 15 mph.

Dime size hail and wind gusts up to 50 mph will be possible with
these storms.

Locations impacted include...
Globe, San Carlos, Miami, Cutter, Central Heights-Midland City,
Claypool, Top-Of-The-World and Inspiration.

This includes the following highways...
US Highway 60 between mile markers 237 and 265.
AZ Route 70 between mile markers 253 and 271.
AZ Route 77 between mile markers 162 and 170.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3338 11045 3329 11046 3324 11044 3314 11057
      3349 11123 3355 11118 3355 11115 3357 11116
      3373 11103 3369 11094 3364 11092 3366 11088
      3341 11036
TIME...MOT...LOC 2324Z 026DEG 14KT 3365 11099 3337 11042

Wilson

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 29, 5:03 PM MST	Areal Flood Advisory	PSR	Gila	3 hr
Jul 29, 5:19 PM MST	Areal Flood Advisory	PSR	Gila	3 hr
Jul 29, 5:39 PM MST	Special Weather Statement	PSR	Pinal	51 min
Jul 29, 5:46 PM MST	Flash Flood Warning	PSR	Gila	3 hr
Jul 29, 6:24 PM MST	Special Weather Statement	PSR	Pinal	51 min
Jul 30, 3:22 PM MST	Special Weather Statement	PSR	Gila	38 min
Jul 30, 3:34 PM MST	Areal Flood Advisory	PSR	Gila	2 hr
Jul 30, 3:57 PM MST	Special Weather Statement	PSR	Gila	48 min
Jul 30, 4:12 PM MST	Special Weather Statement	PSR	Gila	48 min
Jul 30, 4:49 PM MST	Areal Flood Advisory	PSR	Gila	116 min

Nearby

Severe Thunderstorm Warnings in Arizona, 2018 Every severe thunderstorm warning in 2018

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.