Alert archive / Arizona / Special Weather Statements in 2021

Special Weather Statement, NWS Phoenix, AZ

July 14, 2021

NWS Phoenix, AZ issued this special weather statement at Jul 14, 2021, 12:57 AM MST. It was in force for 48 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 14, 2021, 12:57 AM MST (07:57 UTC)
Expired: Jul 14, 2021, 1:45 AM MST
In force: 48 min
Issued by: NWS Phoenix, AZ

The radar

The Phoenix radar (KIWA), 109 km from the middle of the area, began a volume at 07:57 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, 8.0 hours before the alert went out and 138 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: 1016 J/kg
Mixed-layer CIN: -7 J/kg
Mixed-layer LCL: 3063 m above ground
0-6 km bulk shear: 2 kt
0-1 km storm-relative helicity: -21 m²/s²
0-3 km storm-relative helicity: 5 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 13, 10:06 PM MST, 2 hours 51 minutes earlier.

Area forecast discussion, Jul 13, 10:06 PM MST, 2 hours 51 minutes before

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In the hours before

Local storm report, Jul 13, 8:32 PM MST, 4 hours 25 minutes before

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Local storm report, Jul 13, 8:44 PM MST, 4 hours 13 minutes before

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Local storm report, Jul 13, 9:07 PM MST, 3 hours 50 minutes before

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Local storm report, Jul 13, 9:12 PM MST, 3 hours 45 minutes before

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Local storm report, Jul 13, 9:18 PM MST, 3 hours 39 minutes before

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Special weather statement, Jul 14, 12:57 AM MST, 0 minutes before

Special Weather Statement
National Weather Service Phoenix AZ
1257 AM MST Wed Jul 14 2021

AZZ558-560-140845-
San Carlos AZ-Pinal/Superstition Mountains AZ-
1257 AM MST Wed Jul 14 2021

...SIGNIFICANT WEATHER ADVISORY FOR GILA AND PINAL COUNTIES UNTIL 145
AM MST...

At 1256 AM MST, Doppler radar was tracking a strong thunderstorm near
San Carlos, or 19 miles southeast of Globe. This storm was nearly
stationary.

Winds in excess of 40 mph will be possible with this storm.
Storms may produced locally heavy rain that could lead to flooding
concerns.

Locations impacted include...
San Carlos.

This includes AZ Route 70 between mile markers 261 and 271.

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 3319 11044 3320 11046 3318 11047 3319 11050
      3314 11059 3314 11066 3340 11063 3338 11045
      3329 11046 3320 11041
TIME...MOT...LOC 0756Z 092DEG 2KT 3326 11049

AD

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 13, 5:00 PM MST	Special Weather Statement	PSR		45 min
Jul 14, 2:19 AM MST	Special Weather Statement	PSR		41 min
Jul 14, 2:58 AM MST	Areal Flood Advisory	PSR	Gila	3 hr
Jul 14, 4:17 AM MST	Special Weather Statement	PSR	Maricopa	43 min
Jul 14, 4:49 AM MST	Special Weather Statement	PSR	Maricopa	41 min
Jul 14, 5:04 AM MST	Areal Flood Advisory	PSR	Maricopa	3 hr
Jul 14, 5:16 AM MST	Flash Flood Warning	PSR	Maricopa	4 hr
Jul 14, 5:26 AM MST	Special Weather Statement	PSR		49 min
Jul 14, 6:11 AM MST	Special Weather Statement	PSR	Pinal	34 min
Jul 14, 6:59 AM MST	Special Weather Statement	PSR	Pinal	31 min
Jul 14, 7:19 AM MST	Flash Flood Warning Considerable damage threat	PSR	Pinal	116 min
Jul 14, 8:18 AM MST	Flash Flood Warning Considerable damage threat	PSR	Gila	4 hr
Jul 14, 8:42 AM MST	Flash Flood Warning Considerable damage threat	PSR	Gila	4 hr
Jul 14, 9:28 AM MST	Areal Flood Warning	PSR	Pinal	2 hr
Jul 14, 11:06 AM MST	Flash Flood Watch	PSR	Gila, Maricopa, Pinal	60 hr

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.