Alert archive / Arizona / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 79, NWS Tucson, AZ

August 15, 2012Pima County, Arizona

NWS Tucson, AZ issued this severe thunderstorm warning at Aug 15, 2012, 1:46 AM MST for Pima County, Arizona. It was in force for 29 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 15, 2012, 1:46 AM MST (08:46 UTC)
Expired: Aug 15, 2012, 2:15 AM MST
In force: 29 min
Issued by: NWS Tucson, AZ
Area: Storm-based polygon

County Pima County, AZ

The radar

The Phoenix radar (KIWA), 109 km from the middle of the area, began a volume at 08:45 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 (KDMA), launched 00:00Z, 8.8 hours before the alert went out and 129 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: 193 J/kg
Mixed-layer CIN: -9 J/kg
Mixed-layer LCL: 3692 m above ground
0-6 km bulk shear: 5 kt
0-1 km storm-relative helicity: -35 m²/s²
0-3 km storm-relative helicity: 12 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

874 
WUUS55 KTWC 150846
SVRTWC
AZC019-150915-
/O.NEW.KTWC.SV.W.0079.120815T0846Z-120815T0915Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TUCSON AZ
146 AM MST WED AUG 15 2012

THE NATIONAL WEATHER SERVICE IN TUCSON HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTH CENTRAL PIMA COUNTY IN SOUTH CENTRAL ARIZONA...

* UNTIL 215 AM MST

* AT 140 AM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED 
  A SEVERE THUNDERSTORM. THIS STORM WAS LOCATED NEAR VENTANA AND 
  MOVING SOUTHWEST AT 15 MPH.

* THE SEVERE THUNDERSTORM WILL OTHERWISE REMAIN OVER MAINLY RURAL
  AREAS OF THE INDICATED COUNTY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEEK SHELTER INDOORS. EXPECT DAMAGING WINDS IN EXCESS OF 60 MPH...
LARGE HAIL...FREQUENT LIGHTNING...AND HEAVY RAIN WITH THIS STORM.

&&

LAT...LON 3235 11227 3250 11240 3250 11213 3247 11212
TIME...MOT...LOC 0846Z 038DEG 13KT 3247 11223

$$

1 follow-up statement

043 
WWUS55 KTWC 150913
SVSTWC

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TUCSON AZ
213 AM MST WED AUG 15 2012

AZC019-150923-
/O.EXP.KTWC.SV.W.0079.000000T0000Z-120815T0915Z/
PIMA AZ-
213 AM MST WED AUG 15 2012

...THE SEVERE THUNDERSTORM WARNING FOR NORTH CENTRAL PIMA COUNTY WILL
EXPIRE AT 215 AM MST...

DOPPLER RADAR INDICATED THAT THE STORM NEAR VENTANA HAS WEAKENED 
BELOW SEVERE LIMITS. 

LAT...LON 3235 11227 3250 11240 3250 11213 3247 11212
TIME...MOT...LOC 0913Z 038DEG 13KT 3239 11230

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 14, 5:18 PM MST	Severe Thunderstorm Warning	TWC	Pima	42 min
Aug 14, 5:21 PM MST	Areal Flood Advisory	TWC	Cochise	84 min
Aug 14, 5:50 PM MST	Severe Thunderstorm Warning	TWC	Pima	40 min
Aug 14, 6:10 PM MST	Special Weather Statement	TWC	Santa Cruz	65 min
Aug 14, 6:24 PM MST	Special Weather Statement	TWC		51 min
Aug 14, 6:39 PM MST	Special Weather Statement	TWC	Pima	51 min
Aug 14, 6:41 PM MST	Areal Flood Advisory	TWC	Pima	79 min
Aug 14, 6:46 PM MST	Severe Thunderstorm Warning	TWC	Pima	44 min
Aug 14, 8:02 PM MST	Areal Flood Advisory	TWC	Pima	88 min
Aug 14, 9:32 PM MST	Special Weather Statement	TWC	Pinal	58 min
Aug 15, 2:06 PM MST	Areal Flood Advisory	TWC	Cochise	84 min
Aug 15, 2:43 PM MST	Flash Flood Warning	TWC	Cochise	92 min
Aug 15, 4:22 PM MST	Special Weather Statement	TWC	Graham	53 min
Aug 15, 4:43 PM MST	Special Weather Statement	TWC	Cochise	47 min

Nearby

Severe Thunderstorm Warnings in Arizona, 2012 Every severe thunderstorm warning in 2012

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.