Alert archive / Arizona / Severe Thunderstorm Warnings in 2016

Severe Thunderstorm Warning 49, NWS Tucson, AZ

September 12, 2016Graham County, Pima County, Pinal County, Arizona

NWS Tucson, AZ issued this severe thunderstorm warning at Sep 12, 2016, 5:25 PM MST for Graham County, Pima County, Pinal County, Arizona. It was in force for 41 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: Sep 12, 2016, 5:25 PM MST (00:25 UTC)
Expired: Sep 12, 2016, 6:06 PM MST
In force: 41 min
Issued by: NWS Tucson, AZ
Area: Storm-based polygon

Counties Graham County, AZ, Pima County, AZ, Pinal County, AZ

The radar

The Tucson radar (KEMX), 81 km from the middle of the area, began a volume at 00:27 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
Sep 12, 5:25 PM MST	TSTM WND DMG	Oracle, AZ	LARGE TREE DOWN ON MOBILE HOME.

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

The nearest sounding before it

Tuscon, AZ (KDMA), launched 00:00Z, 0.4 hours before the alert went out and 57 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: 599 J/kg
Mixed-layer CIN: -154 J/kg
Mixed-layer LCL: 1884 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: -8 m²/s²
0-3 km storm-relative helicity: 74 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.5

Open this sounding in Storm Lab

The text

As transmitted.

827 
WUUS55 KTWC 130025
SVRTWC
AZC009-019-021-130130-
/O.NEW.KTWC.SV.W.0049.160913T0025Z-160913T0130Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TUCSON AZ
525 PM MST MON SEP 12 2016

THE NATIONAL WEATHER SERVICE IN TUCSON HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHEASTERN PINAL COUNTY IN SOUTHEASTERN ARIZONA...
  NORTHEASTERN PIMA COUNTY IN SOUTHEASTERN ARIZONA...
  SOUTHWESTERN GRAHAM COUNTY IN SOUTHEASTERN ARIZONA...

* UNTIL 630 PM MST

* AT 524 PM MST...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM
  CAPABLE OF PRODUCING LARGE DAMAGING HAIL UP TO GOLF BALL SIZE AND
  DESTRUCTIVE WINDS IN EXCESS OF 70 MPH. THIS STORM WAS LOCATED OVER
  ORACLE...OR 17 MILES NORTHEAST OF ORO VALLEY...AND MOVING EAST AT
  25 TO 30 MPH.

* LOCATIONS IMPACTED INCLUDE...
  MAMMOTH...ORACLE...SAN MANUEL...CAMPO BONITO...BIOSPHERE 2 AND
  SADDLEBROOKE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS...LARGE HAIL...DEADLY
LIGHTNING AND VERY HEAVY RAIN. FOR YOUR PROTECTION...SEEK SHELTER NOW
INSIDE A STURDY STRUCTURE AND STAY AWAY FROM WINDOWS. HEAVY RAINS
FLOOD ROADS QUICKLY SO DO NOT DRIVE INTO AREAS WHERE WATER COVERS THE
ROAD.

&&

LAT...LON 3252 11091 3279 11091 3284 11012 3243 11017
TIME...MOT...LOC 0024Z 276DEG 27KT 3261 11077 

$$

MEYER

1 follow-up statement

740 
WWUS55 KTWC 130106
SVSTWC

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TUCSON AZ
606 PM MST MON SEP 12 2016

AZC009-019-021-130114-
/O.CAN.KTWC.SV.W.0049.000000T0000Z-160913T0130Z/
PINAL-PIMA-GRAHAM-
606 PM MST MON SEP 12 2016

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN PINAL...
NORTHEASTERN PIMA AND SOUTHWESTERN GRAHAM COUNTIES IS CANCELLED...
                
THE STORMS WHICH PROMPTED THE WARNING AVE WEAKENED BELOW SEVERE
LIMITS AND ARE NOW EAST OF ORACLE AND MAMMOTH. THEREFORE THE WARNING
HAS BEEN CANCELLED. HOWEVER HEAVY RAIN IS STILL POSSIBLE WITH THESE
THUNDERSTORMS AS THEY PUSH THROUGH FAR EASTERN PINAL COUNTY AND
INTO WESTERN GRAHAM COUNTY.
.

LAT...LON 3252 11091 3279 11091 3284 11012 3243 11017
TIME...MOT...LOC 0100Z 276DEG 27KT 3258 11041 

$$

MEYER

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 12, 5:42 PM MST	Special Weather Statement	TWC		33 min
Sep 13, 1:13 PM MST	Special Weather Statement	TWC	Pinal	32 min
Sep 13, 1:30 PM MST	Severe Thunderstorm Warning	TWC	Pima, Pinal	45 min
Sep 13, 3:00 PM MST	Areal Flood Advisory	TWC	Pima, Pinal	3 hr
Sep 13, 3:52 PM MST	Flash Flood Warning	TWC	Pima, Pinal	113 min
Sep 13, 4:06 PM MST	Special Weather Statement	TWC	Graham	39 min
Sep 13, 4:57 PM MST	Special Weather Statement	TWC	Greenlee	48 min

Nearby

Severe Thunderstorm Warnings in Arizona, 2016 Every severe thunderstorm warning in 2016

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.