Alert archive / Arizona / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 158, NWS Tucson, AZ

August 27, 2021Pima County, Santa Cruz County, Arizona

NWS Tucson, AZ issued this severe thunderstorm warning at Aug 27, 2021, 1:38 PM MST for Pima County, Santa Cruz County, Arizona. It was in force for 19 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 27, 2021, 1:38 PM MST (20:38 UTC)
Expired: Aug 27, 2021, 1:57 PM MST
In force: 19 min
Issued by: NWS Tucson, AZ
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Pima County, AZ, Santa Cruz County, AZ

The radar

The Tucson radar (KEMX), 93 km from the middle of the area, began a volume at 20:41 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, 8.6 hours before the alert went out and 91 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: 247 J/kg
Mixed-layer CIN: -273 J/kg
Mixed-layer LCL: 2903 m above ground
0-6 km bulk shear: 8 kt
0-1 km storm-relative helicity: -30 m²/s²
0-3 km storm-relative helicity: 15 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

536 
WUUS55 KTWC 272038
SVRTWC
AZC019-023-272130-
/O.NEW.KTWC.SV.W.0158.210827T2038Z-210827T2130Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Tucson AZ
138 PM MST Fri Aug 27 2021

The National Weather Service in Tucson has issued a

* Severe Thunderstorm Warning for...
  Southeastern Pima County in southeastern Arizona...
  Western Santa Cruz County in southeastern Arizona...

* Until 230 PM MST.

* At 137 PM MST, a severe thunderstorm was located 9 miles west of
  Arivaca, or 25 miles west of Tubac, moving southwest at 5 mph.

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

  SOURCE...Radar indicated.

  IMPACT...Hail damage to vehicles is expected. Expect wind damage 
           to roofs, siding, and trees.

* Locations impacted include...
  Sasabe.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3152 11167 3165 11153 3161 11135 3143 11138
TIME...MOT...LOC 2037Z 062DEG 4KT 3154 11148 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

GL

1 follow-up statement

084 
WWUS55 KTWC 272057
SVSTWC

Severe Weather Statement
National Weather Service Tucson AZ
157 PM MST Fri Aug 27 2021

AZC019-023-272106-
/O.CAN.KTWC.SV.W.0158.000000T0000Z-210827T2130Z/
Pima-Santa Cruz-
157 PM MST Fri Aug 27 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN PIMA AND WESTERN
SANTA CRUZ COUNTIES IS CANCELLED...
                
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 has been cancelled.  However gusty winds and
heavy rain are still possible with this thunderstorm.

LAT...LON 3152 11167 3165 11153 3161 11135 3143 11138
TIME...MOT...LOC 2050Z 062DEG 4KT 3153 11150 

$$

GL

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 27, 1:22 PM MST	Special Weather Statement	TWC	Pima	38 min
Aug 27, 2:17 PM MST	Special Weather Statement	TWC	Pima	43 min
Aug 27, 2:54 PM MST	Special Weather Statement	TWC		36 min
Aug 27, 3:49 PM MST	Areal Flood Advisory	TWC	Pima	116 min
Aug 27, 3:57 PM MST	Special Weather Statement	TWC	Greenlee	63 min
Aug 27, 4:39 PM MST	Special Weather Statement	TWC		51 min
Aug 27, 4:56 PM MST	Areal Flood Advisory	TWC	Graham	2 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.