Alert archive / Arizona / Special Weather Statements in 2021

Special Weather Statement, NWS Phoenix, AZ

July 12, 2021

NWS Phoenix, AZ issued this special weather statement at Jul 12, 2021, 11:35 PM MST. 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 outline as issued.

The facts

Issued: Jul 12, 2021, 11:35 PM MST (06:35 UTC)
Expired: Jul 13, 2021, 12:15 AM MST
In force: 40 min
Issued by: NWS Phoenix, AZ

The radar

The Phoenix radar (KIWA), 71 km from the middle of the area, began a volume at 06:35 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, 6.6 hours before the alert went out and 68 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: 523 J/kg
Mixed-layer CIN: -351 J/kg
Mixed-layer LCL: 2953 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 10 m²/s²
0-3 km storm-relative helicity: 38 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

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What forecasters said that day

The local office's own words before this special weather statement 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 special weather statement went out at Jul 12, 10:32 PM MST, 1 hour 3 minutes earlier.

Area forecast discussion, Jul 12, 10:32 PM MST, 1 hour 3 minutes before

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In the hours before

Special weather statement, Jul 12, 7:37 PM MST, 3 hours 58 minutes before

Special Weather Statement
National Weather Service Phoenix AZ
737 PM MST Mon Jul 12 2021

AZZ558-560>563-130315-
Southeast Gila County AZ-San Carlos AZ-Dripping Springs AZ-
Globe/Miami AZ-Pinal/Superstition Mountains AZ-
737 PM MST Mon Jul 12 2021

...SIGNIFICANT WEATHER ADVISORY FOR GILA AND PINAL COUNTIES UNTIL 815
PM MST...

At 737 PM MST, Doppler radar was tracking a strong thunderstorm near
San Carlos, or 16 miles east of Globe, moving southwest at 30 mph.

Half inch hail and winds in excess of 40 mph will be possible with
this storm.

Locations impacted include...
Globe, San Carlos and Cutter.

This includes the following highways...
AZ Route 70 between mile markers 255 and 271.
AZ Route 77 between mile markers 147 and 169.

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 3340 11035 3338 11045 3329 11046 3320 11040
      3319 11050 3314 11059 3315 11063 3308 11070
      3308 11073 3316 11088 3357 11058 3345 11031
      3344 11031
TIME...MOT...LOC 0237Z 033DEG 25KT 3340 11051

SDB

Special weather statement, Jul 12, 9:18 PM MST, 2 hours 17 minutes before

Special Weather Statement
National Weather Service Phoenix AZ
918 PM MST Mon Jul 12 2021

AZZ541-545-547-549-557-130500-
Fountain Hills/East Mesa AZ-New River Mesa AZ-Mazatzal Mountains AZ-
Cave Creek/New River AZ-Rio Verde/Salt River AZ-
918 PM MST Mon Jul 12 2021

...SIGNIFICANT WEATHER ADVISORY FOR MARICOPA COUNTY UNTIL 1000 PM
MST...

At 918 PM MST, Doppler radar was tracking a strong thunderstorm 8
miles west of Sycamore Creek, moving southwest at 20 mph.

Pea size hail and winds in excess of 40 mph will be possible with
this storm.

Locations impacted include...
Scottsdale, Carefree, Desert Mountain, Rio Verde and McDowell
Mountain Park.

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 3389 11147 3364 11168 3382 11192 3400 11168
      3400 11165
TIME...MOT...LOC 0418Z 041DEG 16KT 3390 11161

SDB

Local storm report, Jul 12, 9:28 PM MST, 2 hours 7 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PHOENIX AZ
928 PM MST MON JUL 12 2021

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

0830 PM     TSTM WND GST     7 NW CHRISTMAS          33.15N 110.81W
07/12/2021  M72 MPH          GILA               AZ   MESONET

            MESONET STATION TT418 TONTO PORTABLE #2
            (RAWS). TIME ESTIMATED FROM RADAR.

&&

SB

Special weather statement, Jul 12, 10:28 PM MST, 1 hour 7 minutes before

Special Weather Statement
National Weather Service Phoenix AZ
1028 PM MST Mon Jul 12 2021

AZZ537-540-542>544-546-550-130600-
South Mountain/Ahwatukee AZ-Scottsdale/Paradise Valley AZ-
Buckeye/Avondale AZ-Central Phoenix AZ-Deer Valley AZ-
Northwest Valley AZ-North Phoenix/Glendale AZ-
1028 PM MST Mon Jul 12 2021

...SIGNIFICANT WEATHER ADVISORY FOR MARICOPA COUNTY UNTIL 1100 PM
MST...

At 1028 PM MST, Doppler radar was tracking a strong thunderstorm over
North Mountain Park, or near Phoenix, moving southwest at 20 mph.

Winds in excess of 40 mph will be possible with this storm.

Locations impacted include...
Phoenix, Glendale, Scottsdale, El Mirage, Paradise Valley, Tolleson,
Youngtown, Laveen, Sun City, Glendale Sports Complex, Piestewa Peak
Park, Deer Valley Airport, North Mountain Park, South Phoenix,
Arizona State Fairgrounds, Downtown Peoria, Downtown Phoenix,
Downtown Glendale, Camelback Ranch and Metro Center Mall.

This includes the following highways...
AZ Interstate 10 between mile markers 135 and 151.
AZ Interstate 17 between mile markers 195 and 216.
AZ Route 51 between mile markers 1 and 15.

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 3372 11207 3357 11185 3333 11210 3356 11238
TIME...MOT...LOC 0528Z 046DEG 19KT 3361 11204

SDB

Local storm report, Jul 12, 10:37 PM MST, 58 minutes before

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Special weather statement, Jul 12, 11:35 PM MST, 0 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 12, 7:37 PM MST	Special Weather Statement	PSR	Gila	38 min
Jul 12, 8:17 PM MST	Severe Thunderstorm Warning	PSR	Gila, Pinal	43 min
Jul 12, 8:29 PM MST	Flash Flood Warning Considerable damage threat	PSR	Gila	3 hr
Jul 12, 9:18 PM MST	Special Weather Statement	PSR		42 min
Jul 12, 9:40 PM MST	Severe Thunderstorm Warning	PSR	Maricopa	35 min
Jul 12, 10:05 PM MST	Severe Thunderstorm Warning	PSR	Maricopa	25 min
Jul 12, 10:14 PM MST	Flash Flood Warning Considerable damage threat	PSR	Gila, Maricopa	2 hr
Jul 12, 10:28 PM MST	Special Weather Statement	PSR	Maricopa	32 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.