Alert archive / Arizona / Special Weather Statements in 2021

Special Weather Statement, NWS Tucson, AZ

August 1, 2021

NWS Tucson, AZ issued this special weather statement at Aug 1, 2021, 5:23 PM MST. It was in force for 52 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: Aug 1, 2021, 5:23 PM MST (00:23 UTC)
Expired: Aug 1, 2021, 6:15 PM MST
In force: 52 min
Issued by: NWS Tucson, AZ

The nearest sounding before it

Tuscon, AZ (KTUS), launched 00:00Z, 0.4 hours before the alert went out and 150 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: 972 J/kg
Mixed-layer CIN: -30 J/kg
Mixed-layer LCL: 2391 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: -27 m²/s²
0-3 km storm-relative helicity: 19 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

Open this sounding in Storm Lab

The text

As transmitted.

430 
WWUS85 KTWC 020023
SPSTWC

Special Weather Statement
National Weather Service Tucson AZ
523 PM MST Sun Aug 1 2021
 
AZZ509-510-020115-
Upper Gila River and Aravaipa Valleys including Clifton/Safford-White
Mountains of Graham and Greenlee Counties including Hannagan Meadow-
523 PM MST Sun Aug 1 2021

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN GRAHAM COUNTY UNTIL
615 PM MST...

At 523 PM MST, Doppler radar was tracking a strong thunderstorm 7
miles east of San Carlos, or 23 miles east of Globe, moving northeast
at 5 mph.

Winds in excess of 45 mph will be possible with this storm along 
with small hail and heavy rain.

This storm will remain over mainly remote areas of northwestern
Graham County.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Heavy rainfall is also occurring with this storm, and may lead to
localized flooding. Do not drive your vehicle through flooded
roadways.

&&

LAT...LON 3345 11009 3325 11029 3329 11045 3338 11044
      3340 11040 3340 11037 3343 11032 3343 11029
      3344 11028 3344 11020 3346 11017 3347 11012
TIME...MOT...LOC 0023Z 208DEG 6KT 3336 11034 

$$

Meyer

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 1, 6:03 PM MST	Flash Flood Warning	TWC	Graham	3 hr
Aug 1, 6:35 PM MST	Areal Flood Advisory	TWC	Graham	3 hr
Aug 1, 6:44 PM MST	Special Weather Statement	TWC		31 min
Aug 1, 8:28 PM MST	Special Weather Statement	TWC	Cochise	47 min
Aug 1, 8:40 PM MST	Areal Flood Advisory	TWC	Cochise	2 hr
Aug 2, 12:43 PM MST	Special Weather Statement	TWC	Greenlee	47 min
Aug 2, 1:27 PM MST	Special Weather Statement	TWC	Greenlee	48 min
Aug 2, 2:26 PM MST	Excessive Heat Warning	TWC	Graham, Greenlee, Pima, Pinal	54 hr
Aug 2, 2:43 PM MST	Special Weather Statement	TWC	Cochise	47 min
Aug 2, 2:50 PM MST	Severe Thunderstorm Warning	TWC	Cochise	40 min
Aug 2, 2:51 PM MST	Areal Flood Advisory	TWC	Cochise	114 min
Aug 2, 3:20 PM MST	Areal Flood Advisory	TWC	Santa Cruz	115 min
Aug 2, 4:04 PM MST	Special Weather Statement	TWC	Graham	56 min
Aug 2, 4:22 PM MST	Areal Flood Advisory	TWC	Cochise	113 min
Aug 2, 4:47 PM MST	Special Weather Statement	TWC		43 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.