Alert archive / Arizona / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 23, NWS Tucson, AZ

July 21, 2012Pima County, Arizona

NWS Tucson, AZ issued this severe thunderstorm warning at Jul 21, 2012, 2:27 PM MST for Pima County, Arizona. It was in force for 33 min. 2 reports 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 21, 2012, 2:27 PM MST (21:27 UTC)
Expired: Jul 21, 2012, 3:00 PM MST
In force: 33 min
Issued by: NWS Tucson, AZ
Area: Storm-based polygon

County Pima County, AZ

The radar

The Tucson radar (KEMX), 54 km from the middle of the area, began a volume at 21:28 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 21, 2:31 PM MST	TSTM WND DMG	3 Ese Tucson, AZ	SEVERAL 4 INCH TREE LIMBS DOWN
Jul 21, 2:35 PM MST	TSTM WND DMG	4 Se Catalina Foothills, AZ	E SHORELINE DRIVE AND N SABINO CANYON ROAD...TIME ESTIMATED FROM RADAR

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, 9.5 hours before the alert went out and 15 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: 444 J/kg
Mixed-layer CIN: -130 J/kg
Mixed-layer LCL: 1517 m above ground
0-6 km bulk shear: 13 kt
0-1 km storm-relative helicity: 43 m²/s²
0-3 km storm-relative helicity: 29 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.

032 
WUUS55 KTWC 212127
SVRTWC
AZC019-212200-
/O.NEW.KTWC.SV.W.0023.120721T2127Z-120721T2200Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TUCSON AZ
227 PM MST SAT JUL 21 2012

THE NATIONAL WEATHER SERVICE IN TUCSON HAS ISSUED A

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

* UNTIL 300 PM MST

* AT 224 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 NEAR EAST TUCSON...AND MOVING
  NORTHWEST AT 10 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  SABINO CANYON...SOUTH TUCSON AND CATALINA FOOTHILLS.

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 3226 11120 3249 11100 3226 11071 3212 11083
TIME...MOT...LOC 2127Z 127DEG 10KT 3224 11086

$$

MEYER

2 follow-up statements

601 
WWUS55 KTWC 212144
SVSTWC

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TUCSON AZ
244 PM MST SAT JUL 21 2012

AZC019-212200-
/O.CON.KTWC.SV.W.0023.000000T0000Z-120721T2200Z/
PIMA AZ-
244 PM MST SAT JUL 21 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 300 PM MST
FOR EAST CENTRAL PIMA COUNTY...

AT 236 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 CATALINA FOOTHILLS AND
NORTHERN TUCSON...MOVING NORTHWEST AT 10 MPH.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3226 11120 3249 11100 3226 11071 3212 11083
TIME...MOT...LOC 2144Z 127DEG 10KT 3229 11091

$$

MEYER

840 
WWUS55 KTWC 212157
SVSTWC

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TUCSON AZ
257 PM MST SAT JUL 21 2012

AZC019-212206-
/O.EXP.KTWC.SV.W.0023.000000T0000Z-120721T2200Z/
PIMA AZ-
257 PM MST SAT JUL 21 2012

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL PIMA COUNTY WILL
EXPIRE AT 300 PM MST...

AT 255 PM MST THE THUNDERSTORM OVER TUCSON HAD WEAKENED TO BELOW 
SEVERE LEVELS. ADDITIONAL DEVELOPMENT WAS OCCURRING WEST AND 
NORTHWEST OF THE CITY.

LAT...LON 3226 11120 3249 11100 3226 11071 3212 11083
TIME...MOT...LOC 2156Z 127DEG 10KT 3231 11094

$$

MEYER

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 20, 5:26 PM MST	Areal Flood Advisory	TWC	Pima	94 min
Jul 21, 12:49 PM MST	Special Weather Statement	TWC	Santa Cruz	41 min
Jul 21, 12:56 PM MST	Severe Thunderstorm Warning	TWC	Pima, Santa Cruz	34 min
Jul 21, 1:43 PM MST	Areal Flood Advisory	TWC	Pima, Santa Cruz	2 hr
Jul 21, 1:53 PM MST	Flash Flood Warning	TWC	Pima	112 min
Jul 21, 2:26 PM MST	Areal Flood Advisory	TWC	Graham	2 hr
Jul 21, 3:01 PM MST	Severe Thunderstorm Warning	TWC	Pima	44 min
Jul 21, 3:05 PM MST	Severe Thunderstorm Warning	TWC	Pima	40 min
Jul 21, 3:25 PM MST	Severe Thunderstorm Warning	TWC	Pinal	50 min
Jul 21, 3:36 PM MST	Severe Thunderstorm Warning	TWC	Graham, Pinal	39 min
Jul 21, 3:38 PM MST	Areal Flood Advisory	TWC	Pima	58 min
Jul 21, 4:07 PM MST	Areal Flood Advisory	TWC	Pinal	83 min
Jul 21, 4:11 PM MST	Areal Flood Advisory	TWC	Pinal	79 min
Jul 21, 4:27 PM MST	Areal Flood Advisory	TWC	Pima, Pinal	108 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.