Alert archive / Arizona / Tornado Warnings in 2017

Tornado Warning 1, NWS Tucson, AZ

July 14, 2017Pinal County, Arizona

NWS Tucson, AZ issued this tornado warning at Jul 14, 2017, 6:36 PM MST for Pinal County, Arizona. It was in force for 24 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: Jul 14, 2017, 6:36 PM MST (01:36 UTC)
Expired: Jul 14, 2017, 7:00 PM MST
In force: 24 min
Issued by: NWS Tucson, AZ
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

County Pinal County, AZ

The radar

The Phoenix radar (KIWA), 84 km from the middle of the area, began a volume at 01:38 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jul 14, 4:35 PM MST	Severe Thunderstorm Watch	SPC	4 hr

The nearest sounding before it

Tuscon, AZ (KDMA), launched 00:00Z, 1.6 hours before the alert went out and 61 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: 557 J/kg
Mixed-layer CIN: -49 J/kg
Mixed-layer LCL: 2796 m above ground
0-6 km bulk shear: 14 kt
0-1 km storm-relative helicity: -1 m²/s²
0-3 km storm-relative helicity: 24 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

712 
WFUS55 KTWC 150136
TORTWC
AZC021-150200-
/O.NEW.KTWC.TO.W.0001.170715T0136Z-170715T0200Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Tucson AZ
636 PM MST FRI JUL 14 2017

The National Weather Service in Tucson has issued a

* Tornado Warning for...
  South central Pinal County in southeastern Arizona...

* Until 700 PM MST
    
* At 634 PM MST, a severe thunderstorm capable of producing a 
  tornado was located 6 miles northeast of Red Rock, moving 
  southwest at 25 mph.

  HAZARD...Tornado. 

  SOURCE...Radar indicated rotation. 

  IMPACT...Flying debris will be dangerous to those caught without 
           shelter. Mobile homes will be damaged or destroyed. 
           Damage to roofs, windows, and vehicles will occur.  Tree 
           damage is likely. 

* This tornadic thunderstorm may move across Interstate 10 near Red 
  Rock by 650 pm.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

&&

LAT...LON 3269 11128 3267 11115 3252 11124 3252 11139
TIME...MOT...LOC 0134Z 026DEG 21KT 3266 11121 

TORNADO...RADAR INDICATED
HAIL...<.75IN

$$

1 follow-up statement

541 
WWUS55 KTWC 150149
SVSTWC

Severe Weather Statement
National Weather Service Tucson AZ
649 PM MST FRI JUL 14 2017

AZC021-150200-
/O.CON.KTWC.TO.W.0001.000000T0000Z-170715T0200Z/
Pinal-
649 PM MST FRI JUL 14 2017

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 700 PM MST FOR SOUTH
CENTRAL PINAL COUNTY...
    
At 646 PM MST, a severe thunderstorm capable of producing a tornado 
was located 4 miles northeast of Red Rock, moving south at 20 mph.

HAZARD...Tornado. 

SOURCE...Radar indicated rotation. 

IMPACT...Flying debris will be dangerous to those caught without 
         shelter. Mobile homes will be damaged or destroyed. Damage 
         to roofs, windows, and vehicles will occur.  Tree damage is 
         likely. 

This tornadic thunderstorm will move across Interstate 10 near Red 
Rcok between 650 pm and 655 pm.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Heavy rainfall may hide this tornado. Do not wait to see or hear the
tornado. TAKE COVER NOW!

&&

LAT...LON 3263 11132 3260 11119 3252 11124 3252 11139
TIME...MOT...LOC 0146Z 020DEG 18KT 3259 11126 

TORNADO...RADAR INDICATED
HAIL...<.75IN

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 14, 5:35 PM MST	Special Weather Statement	TWC	Pinal	40 min
Jul 14, 5:36 PM MST	Blowing Dust Advisory	TWC	Pima, Pinal	4 hr
Jul 14, 6:11 PM MST	Severe Thunderstorm Warning	TWC	Pinal	49 min
Jul 14, 6:20 PM MST	Dust Storm Warning	TWC	Pinal	90 min
Jul 14, 6:32 PM MST	Severe Thunderstorm Warning	TWC	Pinal	43 min
Jul 14, 6:50 PM MST	Special Weather Statement	TWC	Pima	25 min
Jul 14, 6:58 PM MST	Special Weather Statement	TWC		47 min
Jul 14, 7:01 PM MST	Tornado Warning	TWC	Pima, Pinal	29 min
Jul 14, 7:33 PM MST	Special Weather Statement	TWC	Santa Cruz	57 min
Jul 15, 3:19 PM MST	Special Weather Statement	TWC	Santa Cruz	41 min
Jul 15, 3:29 PM MST	Severe Thunderstorm Warning	TWC	Pima, Pinal	27 min
Jul 15, 3:41 PM MST	Special Weather Statement	TWC	Pinal	64 min
Jul 15, 3:59 PM MST	Blowing Dust Advisory	TWC	Pima, Pinal	6 hr
Jul 15, 4:03 PM MST	Special Weather Statement	TWC	Pima	42 min
Jul 15, 4:37 PM MST	Severe Thunderstorm Warning	TWC	Santa Cruz	38 min
Jul 15, 4:43 PM MST	Special Weather Statement	TWC	Pinal	47 min
Jul 15, 4:52 PM MST	Special Weather Statement	TWC	Pinal	38 min

Nearby

Tornado Warnings in Arizona, 2017 Every tornado warning in 2017 Tornadoes in 2017

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.