Alert archive / Arizona / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 38, NWS Tucson, AZ

July 28, 2012Pima County, Arizona

NWS Tucson, AZ issued this severe thunderstorm warning at Jul 28, 2012, 2:44 PM MST for Pima County, Arizona. It was in force for 31 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 28, 2012, 2:44 PM MST (21:44 UTC)
Expired: Jul 28, 2012, 3:15 PM MST
In force: 31 min
Issued by: NWS Tucson, AZ
Area: Storm-based polygon

County Pima County, AZ

The radar

The Tucson radar (KEMX), 39 km from the middle of the area, began a volume at 21:47 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 (KTUS), launched 12:00Z, 9.7 hours before the alert went out and 5 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: 34 J/kg
Mixed-layer CIN: -67 J/kg
Mixed-layer LCL: 1726 m above ground
0-6 km bulk shear: 9 kt
0-1 km storm-relative helicity: -2 m²/s²
0-3 km storm-relative helicity: 71 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.

424 
WUUS55 KTWC 282144
SVRTWC
AZC019-282215-
/O.NEW.KTWC.SV.W.0038.120728T2144Z-120728T2215Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TUCSON AZ
244 PM MST SAT JUL 28 2012

THE NATIONAL WEATHER SERVICE IN TUCSON HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHEASTERN PIMA COUNTY IN SOUTH CENTRAL ARIZONA...
  THIS INCLUDES THE CITIES OF...TUCSON...ORO VALLEY...

* UNTIL 315 PM MST

* AT 238 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS
  OF 60 MPH.  THIS STORM WAS LOCATED 16 MILES SOUTHEAST OF TUCSON...
  AND MOVING NORTHWEST AT 15 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  SAHUARITA

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 3228 11112 3251 11111 3251 11068 3215 11054
      3178 11045 3182 11096
TIME...MOT...LOC 2145Z 124DEG 13KT 3212 11074

$$

GL

2 follow-up statements

683 
WWUS55 KTWC 282157
SVSTWC

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TUCSON AZ
257 PM MST SAT JUL 28 2012

AZC019-282215-
/O.CON.KTWC.SV.W.0038.000000T0000Z-120728T2215Z/
PIMA AZ-
257 PM MST SAT JUL 28 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 315 PM MST
FOR NORTHEASTERN PIMA COUNTY...

AT 252 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN
EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR RITA RANCH...OR 13
MILES SOUTHEAST OF TUCSON...MOVING NORTHWEST AT 15 MPH.

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 3228 11112 3251 11111 3251 11068 3215 11054
      3178 11045 3182 11096
TIME...MOT...LOC 2157Z 124DEG 13KT 3214 11078

$$

GL

509 
WWUS55 KTWC 282214
SVSTWC

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TUCSON AZ
314 PM MST SAT JUL 28 2012

AZC019-282223-
/O.EXP.KTWC.SV.W.0038.000000T0000Z-120728T2215Z/
PIMA AZ-
314 PM MST SAT JUL 28 2012

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN PIMA COUNTY WILL
EXPIRE AT 315 PM MST...

AT 312 PM MST THE THUNDERSTORMS IN NORTHEASTERN PIMA COUNTY WERE 
SHOWING A WEAKENING TREND. STORMS WOULD STILL BE CAPABLE OF WIND 
GUSTS TO 45 MPH ALONG WITH VERY HEAVY RAIN.

LAT...LON 3228 11112 3251 11111 3251 11068 3215 11054
      3178 11045 3182 11096
TIME...MOT...LOC 2213Z 124DEG 13KT 3217 11084

$$

MEYER

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 27, 6:43 PM MST	Special Weather Statement	TWC		47 min
Jul 27, 8:49 PM MST	Special Weather Statement	TWC		41 min
Jul 28, 11:45 AM MST	Special Weather Statement	TWC	Cochise	30 min
Jul 28, 1:06 PM MST	Special Weather Statement	TWC	Cochise	39 min
Jul 28, 1:45 PM MST	Areal Flood Advisory	TWC	Cochise, Graham	3 hr
Jul 28, 2:26 PM MST	Special Weather Statement	TWC		34 min
Jul 28, 2:35 PM MST	Special Weather Statement	TWC	Graham	40 min
Jul 28, 3:02 PM MST	Special Weather Statement	TWC	Santa Cruz	43 min
Jul 28, 3:08 PM MST	Areal Flood Advisory	TWC	Pima	3 hr
Jul 28, 3:11 PM MST	Flash Flood Warning	TWC	Santa Cruz	60 min
Jul 28, 3:15 PM MST	Flash Flood Warning	TWC	Pima	2 hr
Jul 28, 3:29 PM MST	Special Weather Statement	TWC		31 min
Jul 28, 3:33 PM MST	Special Weather Statement	TWC		42 min
Jul 28, 3:54 PM MST	Flash Flood Warning	TWC	Pima	2 hr
Jul 28, 4:04 PM MST	Severe Thunderstorm Warning	TWC	Cochise	41 min
Jul 28, 4:23 PM MST	Flash Flood Warning	TWC	Cochise	2 hr
Jul 28, 4:44 PM MST	Special Weather Statement	TWC	Pinal	46 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.