Alert archive / Arizona / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 157, NWS Tucson, AZ

August 26, 2021Pima County, Arizona

NWS Tucson, AZ issued this severe thunderstorm warning at Aug 26, 2021, 4:01 PM MST for Pima County, Arizona. It was in force for 44 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 26, 2021, 4:01 PM MST (23:01 UTC)
Expired: Aug 26, 2021, 4:45 PM MST
In force: 44 min
Issued by: NWS Tucson, AZ
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

County Pima County, AZ

The radar

The Tucson radar (KEMX), 107 km from the middle of the area, began a volume at 23:03 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, 11.0 hours before the alert went out and 95 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: 410 J/kg
Mixed-layer CIN: -282 J/kg
Mixed-layer LCL: 2554 m above ground
0-6 km bulk shear: 8 kt
0-1 km storm-relative helicity: -18 m²/s²
0-3 km storm-relative helicity: -13 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

826 
WUUS55 KTWC 262301
SVRTWC
AZC019-262345-
/O.NEW.KTWC.SV.W.0157.210826T2301Z-210826T2345Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Tucson AZ
401 PM MST Thu Aug 26 2021

The National Weather Service in Tucson has issued a

* Severe Thunderstorm Warning for...
  South central Pima County in southeastern Arizona...

* Until 445 PM MST.

* At 401 PM MST, a severe thunderstorm was located near San Miguel,
  or 16 miles south of Sells, moving north at 10 mph.

  HAZARD...60 mph wind gusts and penny size hail.

  SOURCE...Radar indicated.

  IMPACT...Expect damage to roofs, siding, and trees.

* Locations impacted include...
  Topawa, Vamori, Choulic, Coldfields, Fresnal Canyon and South
  Komelik.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 3161 11168 3162 11189 3188 11194 3181 11153
TIME...MOT...LOC 2301Z 183DEG 7KT 3169 11178 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Meyer

1 follow-up statement

083 
WWUS55 KTWC 262335
SVSTWC

Severe Weather Statement
National Weather Service Tucson AZ
435 PM MST Thu Aug 26 2021

AZC019-262345-
/O.EXP.KTWC.SV.W.0157.000000T0000Z-210826T2345Z/
Pima-
435 PM MST Thu Aug 26 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL PIMA COUNTY WILL
EXPIRE AT 445 PM MST...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning will be allowed to expire.  However heavy rain
is still possible with this thunderstorm.

LAT...LON 3161 11168 3162 11189 3188 11194 3181 11153
TIME...MOT...LOC 2335Z 183DEG 7KT 3175 11178 

$$

Meyer

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 26, 2:17 PM MST	Special Weather Statement	TWC		43 min
Aug 26, 2:43 PM MST	Severe Thunderstorm Warning	TWC	Pinal	47 min
Aug 26, 2:46 PM MST	Severe Thunderstorm Warning	TWC	Cochise, Pima	44 min
Aug 26, 2:49 PM MST	Special Weather Statement	TWC		41 min
Aug 26, 3:40 PM MST	Special Weather Statement	TWC	Pima	50 min
Aug 26, 3:45 PM MST	Areal Flood Advisory	TWC	Pima	3 hr

Nearby

Severe Thunderstorm Warnings in Arizona, 2021 Every severe thunderstorm warning 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.