Alert archive / Arizona / Special Weather Statements in 2021

Special Weather Statement, NWS Tucson, AZ

August 7, 2021

NWS Tucson, AZ issued this special weather statement at Aug 7, 2021, 3:53 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 7, 2021, 3:53 PM MST (22:53 UTC)
Expired: Aug 7, 2021, 4:45 PM MST
In force: 52 min
Issued by: NWS Tucson, AZ
Hail: 0.25 in
Wind: 30

The radar

The Tucson radar (KEMX), 118 km from the middle of the area, began a volume at 22:54 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, 10.9 hours before the alert went out and 134 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: 174 J/kg
Mixed-layer CIN: -334 J/kg
Mixed-layer LCL: 2050 m above ground
0-6 km bulk shear: 12 kt
0-1 km storm-relative helicity: 38 m²/s²
0-3 km storm-relative helicity: 6 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

098 
WWUS85 KTWC 072253
SPSTWC

Special Weather Statement
National Weather Service Tucson AZ
353 PM MST Sat Aug 7 2021
 
AZZ508-509-512-072345-
Upper Gila River and Aravaipa Valleys including
Clifton/Safford-Chiricahua Mountains including Chiricahua National
Monument-Eastern Cochise County Below 5000 Feet including
Douglas/Willcox-
353 PM MST Sat Aug 7 2021

...A strong thunderstorm will impact portions of southeastern Graham
and north central Cochise Counties through 445 PM MST...

At 353 PM MST, Doppler radar was tracking a strong thunderstorm over
Bowie, or 21 miles east of Willcox, moving southeast at 20 mph.

HAZARD...Winds in excess of 30 mph and pea size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around 
         unsecured objects. Minor damage to outdoor objects is 
         possible.

Locations impacted include...
Bowie.

This includes Interstate 10 between mile markers 359 and 373.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building. 

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 3231 10961 3246 10950 3236 10930 3220 10941
TIME...MOT...LOC 2253Z 300DEG 18KT 3235 10948 

MAX HAIL SIZE...0.25 IN
MAX WIND GUST...30 MPH

$$

Singer

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 6, 5:01 PM MST	Severe Thunderstorm Warning	TWC	Pima	44 min
Aug 6, 5:02 PM MST	Special Weather Statement	TWC	Pima	43 min
Aug 6, 5:14 PM MST	Special Weather Statement	TWC	Greenlee	46 min
Aug 6, 5:18 PM MST	Severe Thunderstorm Warning	TWC	Pima	42 min
Aug 6, 5:27 PM MST	Areal Flood Advisory	TWC	Pima	2 hr
Aug 6, 5:28 PM MST	Areal Flood Advisory	TWC	Pima	2 hr
Aug 6, 5:29 PM MST	Severe Thunderstorm Warning	TWC	Pima, Pinal	46 min
Aug 6, 5:40 PM MST	Areal Flood Advisory	TWC	Pima	3 hr
Aug 6, 5:50 PM MST	Special Weather Statement	TWC	Graham	25 min
Aug 6, 6:00 PM MST	Flash Flood Warning Considerable damage threat	TWC	Pima	3 hr
Aug 6, 6:02 PM MST	Severe Thunderstorm Warning	TWC	Pima, Pinal	58 min
Aug 6, 6:19 PM MST	Tornado Warning	TWC	Pima	26 min
Aug 6, 6:23 PM MST	Flash Flood Warning Considerable damage threat	TWC	Pima, Pinal	4 hr
Aug 6, 7:02 PM MST	Special Weather Statement	TWC		43 min
Aug 6, 9:25 PM MST	Areal Flood Warning	TWC	Pima	3 hr
Aug 7, 12:54 PM MST	Severe Thunderstorm Warning	TWC	Cochise	51 min
Aug 7, 1:41 PM MST	Severe Thunderstorm Warning	TWC	Cochise	49 min
Aug 7, 2:47 PM MST	Special Weather Statement	TWC	Cochise	28 min
Aug 7, 2:55 PM MST	Severe Thunderstorm Warning	TWC	Cochise	34 min
Aug 7, 3:09 PM MST	Areal Flood Advisory	TWC	Cochise	111 min
Aug 7, 3:17 PM MST	Severe Thunderstorm Warning	TWC	Cochise	43 min
Aug 7, 3:25 PM MST	Special Weather Statement	TWC	Greenlee	50 min
Aug 7, 4:51 PM MST	Special Weather Statement	TWC	Pima	39 min
Aug 7, 4:57 PM MST	Special Weather Statement	TWC	Cochise	48 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.