Alert archive / Arizona / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 166, NWS Tucson, AZ

August 28, 2021Pima County, Arizona

NWS Tucson, AZ issued this severe thunderstorm warning at Aug 28, 2021, 6:31 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 28, 2021, 6:31 PM MST (01:31 UTC)
Expired: Aug 28, 2021, 7:15 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 Phoenix radar (KIWA), 179 km from the middle of the area, began a volume at 01:33 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, 1.5 hours before the alert went out and 178 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: 645 J/kg
Mixed-layer CIN: -152 J/kg
Mixed-layer LCL: 3094 m above ground
0-6 km bulk shear: 5 kt
0-1 km storm-relative helicity: -11 m²/s²
0-3 km storm-relative helicity: 21 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

602 
WUUS55 KTWC 290131
SVRTWC
AZC019-290215-
/O.NEW.KTWC.SV.W.0166.210829T0131Z-210829T0215Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Tucson AZ
631 PM MST Sat Aug 28 2021

The National Weather Service in Tucson has issued a

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

* Until 715 PM MST.

* At 631 PM MST, a severe thunderstorm was located 7 miles east of
  Organ Pipe Cactus National Monument, or 27 miles south of Ajo,
  moving southwest at 30 mph.

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

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Organ Pipe Cactus National Monument and Lukeville. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Large hail and damaging winds and continuous cloud to ground
lightning is occurring with this storm. Move indoors immediately.
Lightning is one of nature's leading killers. Remember, if you can
hear thunder, you are close enough to be struck by lightning.

&&

LAT...LON 3212 11269 3196 11256 3185 11274 3195 11307
      3196 11307
TIME...MOT...LOC 0131Z 058DEG 26KT 3200 11274 

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

$$

Cerniglia

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 28, 5:03 PM MST	Flash Flood Warning Considerable damage threat	TWC	Pima, Pinal	117 min
Aug 28, 5:12 PM MST	Special Weather Statement	TWC	Pinal	48 min
Aug 28, 5:20 PM MST	Severe Thunderstorm Warning	TWC	Pinal	40 min
Aug 28, 6:47 PM MST	Special Weather Statement	TWC	Pinal	43 min
Aug 28, 7:01 PM MST	Areal Flood Warning	TWC	Pima, Pinal	3 hr
Aug 28, 7:14 PM MST	Severe Thunderstorm Warning	TWC	Pima	61 min
Aug 28, 7:41 PM MST	Flash Flood Warning	TWC	Pima	109 min
Aug 28, 8:03 PM MST	Severe Thunderstorm Warning	TWC	Pima	57 min
Aug 28, 8:25 PM MST	Flash Flood Warning Considerable damage threat	TWC	Pima	2 hr
Aug 29, 2:32 PM MST	Special Weather Statement	TWC	Cochise	43 min
Aug 29, 3:53 PM MST	Special Weather Statement	TWC	Pima	37 min
Aug 29, 4:23 PM MST	Areal Flood Advisory	TWC	Pima	112 min
Aug 29, 4:46 PM MST	Special Weather Statement	TWC	Pinal	59 min

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.