Alert archive / Arizona / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 65, NWS Tucson, AZ

July 15, 2021Graham County, Arizona

NWS Tucson, AZ issued this severe thunderstorm warning at Jul 15, 2021, 3:57 PM MST for Graham County, Arizona. It was in force for 33 min. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Jul 15, 2021, 3:57 PM MST (22:57 UTC)
Expired: Jul 15, 2021, 4:30 PM MST
In force: 33 min
Issued by: NWS Tucson, AZ
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

County Graham County, AZ

The radar

The Tucson radar (KEMX), 141 km from the middle of the area, began a volume at 23:00 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.

What was reported inside it

Time	Report	Where	Remark
Jul 15, 4:07 PM MST	TSTM WND GST 62	4 Ene Safford, AZ	KSAD MEASURED WIND GUST TO 62 MPH.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Tuscon, AZ (KTUS), launched 12:00Z, 11.0 hours before the alert went out and 140 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: 1024 J/kg
Mixed-layer CIN: -67 J/kg
Mixed-layer LCL: 1408 m above ground
0-6 km bulk shear: 13 kt
0-1 km storm-relative helicity: 14 m²/s²
0-3 km storm-relative helicity: 41 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

656 
WUUS55 KTWC 152257
SVRTWC
AZC009-152330-
/O.NEW.KTWC.SV.W.0065.210715T2257Z-210715T2330Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Tucson AZ
357 PM MST Thu Jul 15 2021

The National Weather Service in Tucson has issued a

* Severe Thunderstorm Warning for...
  Southeastern Graham County in southeastern Arizona...

* Until 430 PM MST.

* At 355 PM MST, another severe thunderstorm has developed in the 
  vicinity of Pima and Safford, moving south at 10 mph.

  HAZARD...60 mph wind gusts and small hail.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Safford, Thatcher, Solomon, Roper Lake State Park, Safford Regional
  Airport, Pima, Central and Swift Trail Junction.

This includes the following highways...
 Route 70 between mile markers 330 and 358.
 Route 191 between mile markers 109 and 139.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Damaging winds and frequent 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.

Torrential rainfall is occurring under this storm, and may lead to 
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 3305 10975 3292 10942 3266 10940 3266 10972
      3282 10990
TIME...MOT...LOC 2255Z 345DEG 10KT 3287 10972 

HAIL...<.75IN
WIND...60MPH
 
$$

Cerniglia

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 14, 5:33 PM MST	Special Weather Statement	TWC		27 min
Jul 14, 5:41 PM MST	Special Weather Statement	TWC		49 min
Jul 15, 6:07 AM MST	Areal Flood Advisory	TWC	Pima	113 min
Jul 15, 6:33 AM MST	Flash Flood Warning Considerable damage threat	TWC	Pima	3 hr
Jul 15, 8:12 AM MST	Areal Flood Advisory	TWC	Pima	2 hr
Jul 15, 8:32 AM MST	Flash Flood Warning Considerable damage threat	TWC	Pima	3 hr
Jul 15, 8:40 AM MST	Flash Flood Warning Considerable damage threat	TWC	Pima	114 min
Jul 15, 1:51 PM MST	Areal Flood Advisory	TWC	Cochise, Graham	3 hr
Jul 15, 1:55 PM MST	Special Weather Statement	TWC	Greenlee	35 min
Jul 15, 2:19 PM MST	Severe Thunderstorm Warning	TWC	Cochise, Graham	41 min
Jul 15, 2:31 PM MST	Areal Flood Advisory	TWC	Cochise	119 min
Jul 15, 2:52 PM MST	Severe Thunderstorm Warning	TWC	Cochise	38 min
Jul 15, 3:15 PM MST	Severe Thunderstorm Warning	TWC	Graham	45 min
Jul 15, 3:30 PM MST	Areal Flood Advisory	TWC	Graham, Greenlee	3 hr
Jul 15, 4:29 PM MST	Flash Flood Warning Considerable damage threat	TWC	Graham	2 hr
Jul 15, 4:42 PM MST	Special Weather Statement	TWC	Graham	33 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.