Alert archive / Arizona / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 39, NWS Tucson, AZ

July 9, 2011Pima County, Arizona

NWS Tucson, AZ issued this severe thunderstorm warning at Jul 9, 2011, 2:45 PM MST for Pima County, Arizona. It was in force for 45 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 9, 2011, 2:45 PM MST (21:45 UTC)
Expired: Jul 9, 2011, 3:30 PM MST
In force: 45 min
Issued by: NWS Tucson, AZ
Area: Storm-based polygon

County Pima County, AZ

The radar

The Tucson radar (KEMX), 38 km from the middle of the area, began a volume at 21:45 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.

What was reported inside it

Time	Report	Where	Remark
Jul 9, 2:55 PM MST	TSTM WND DMG	3 Wsw Sahuarita, AZ	SEVERAL POWER POLES DOWN ON LA CANADA DR BETWEEN SAHUARITA ROAD AND DUVAL MINE ROAD.
Jul 9, 2:55 PM MST	TSTM WND DMG	4 Sw Sahuarita, AZ	SEVERAL LARGE BRANCHES DOWN. ESTIMATED WINDS OF 60 MPH.

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, 9.8 hours before the alert went out and 32 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: 52 J/kg
Mixed-layer CIN: -269 J/kg
Mixed-layer LCL: 2439 m above ground
0-6 km bulk shear: 3 kt
0-1 km storm-relative helicity: -46 m²/s²
0-3 km storm-relative helicity: 7 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.

869 
WUUS55 KTWC 092145
SVRTWC
AZC019-092230-
/O.NEW.KTWC.SV.W.0039.110709T2145Z-110709T2230Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TUCSON AZ
245 PM MST SAT JUL 9 2011

THE NATIONAL WEATHER SERVICE IN TUCSON HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EAST CENTRAL PIMA COUNTY IN SOUTH CENTRAL ARIZONA...
  THIS INCLUDES THE CITY OF GREEN VALLEY...

* UNTIL 330 PM MST

* AT 236 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR   
  SAHUARITA AND GREEN VALLEY...AND MOVING NORTHWEST 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 3190 11122 3210 11100 3187 11079 3174 11093
TIME...MOT...LOC 2145Z 147DEG 12KT 3192 11096

$$

4 follow-up statements

180 
WWUS55 KTWC 092157
SVSTWC

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TUCSON AZ
257 PM MST SAT JUL 9 2011

AZC019-092230-
/O.CON.KTWC.SV.W.0039.000000T0000Z-110709T2230Z/
PIMA AZ-
257 PM MST SAT JUL 9 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 330 PM MST
FOR EAST CENTRAL PIMA COUNTY...

AT 245 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
INDICATED SEVERAL THUNDERSTORMS CAPABLE OF PRODUCING QUARTER SIZE 
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH. ONE SEVERE STORM WAS 
NEAR DUVAL MINE ROAD...ONE WAS JUST SOUTH OF SAHUARITA AND ANOTHER 
ONE WAS JUST NORTH OF MADERA CANYON. THESE STORMS WERE MOVING 
NORTHWEST AT 15 MPH. 

LAT...LON 3190 11122 3210 11100 3187 11079 3174 11093
TIME...MOT...LOC 2155Z 147DEG 12KT 3195 11098

$$

417 
WWUS55 KTWC 092208
SVSTWC

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TUCSON AZ
308 PM MST SAT JUL 9 2011

AZC019-092230-
/O.CON.KTWC.SV.W.0039.000000T0000Z-110709T2230Z/
PIMA AZ-
308 PM MST SAT JUL 9 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 330 PM MST
FOR EAST CENTRAL PIMA COUNTY...

AT 259 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE 
HAIL...DAMAGING WINDS IN EXCESS OF 60 MPH...AND HEAVY RAIN. THIS 
STORM WAS LOCATED JUST WEST OF INTERSTATE 19 AND NORTH OF DUVAL MINE 
ROAD...MOVING WEST AT 10 TO 15 MPH.

LAT...LON 3190 11122 3210 11100 3187 11079 3174 11093
TIME...MOT...LOC 2207Z 147DEG 12KT 3198 11101

$$

196 
WWUS55 KTWC 092220
SVSTWC

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TUCSON AZ
320 PM MST SAT JUL 9 2011

AZC019-092230-
/O.CON.KTWC.SV.W.0039.000000T0000Z-110709T2230Z/
PIMA AZ-
320 PM MST SAT JUL 9 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 330 PM MST
FOR EAST CENTRAL PIMA COUNTY...

AT 313 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE 
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS WEST 
OF INTERSTATE 19...MOVING WEST AT 10 TO 15 MPH.

LAT...LON 3203 11107 3194 11093 3184 11110 3190 11122
TIME...MOT...LOC 2220Z 147DEG 12KT 3202 11104

$$

643 
WWUS55 KTWC 092231
SVSTWC

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TUCSON AZ
331 PM MST SAT JUL 9 2011

AZC019-092240-
/O.EXP.KTWC.SV.W.0039.000000T0000Z-110709T2230Z/
PIMA AZ-
331 PM MST SAT JUL 9 2011

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL PIMA COUNTY HAS
EXPIRED...

DOPPLER RADAR INDICATED THAT THE SEVERE THUNDERSTORM HAD WEAKENED 
BUT REMAINED STRONG OVER THE SIERRITA MOUNTAINS. SEVERE WEATHER HAS 
ENDED IN GREEN VALLEY AND SAHUARITA AT THIS TIME. ADDITIONAL 
THUNDERSTORMS WITH MODERATE TO HEAVY RAIN ARE POSSIBLE OVER THE NEXT 
HOUR.

LAT...LON 3203 11107 3194 11093 3184 11110 3190 11122
TIME...MOT...LOC 2230Z 147DEG 12KT 3205 11106

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 9, 6:08 AM MST	Areal Flood Advisory	TWC	Cochise	112 min
Jul 9, 1:32 PM MST	Flash Flood Warning	TWC	Cochise	3 hr
Jul 9, 2:40 PM MST	Areal Flood Advisory	TWC	Pima, Santa Cruz	110 min
Jul 9, 2:58 PM MST	Severe Thunderstorm Warning	TWC	Cochise	47 min
Jul 9, 3:16 PM MST	Areal Flood Advisory	TWC	Pima	89 min
Jul 9, 4:23 PM MST	Flash Flood Warning	TWC	Pima, Pinal	112 min

Nearby

Severe Thunderstorm Warnings in Arizona, 2011 Every severe thunderstorm warning in 2011

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.