Alert archive / Arizona / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 41, NWS Tucson, AZ

July 9, 2011Pima County, Arizona

NWS Tucson, AZ issued this severe thunderstorm warning at Jul 9, 2011, 7:21 PM MST for Pima County, Arizona. It was in force for 54 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 9, 2011, 7:21 PM MST (02:21 UTC)
Expired: Jul 9, 2011, 8:15 PM MST
In force: 54 min
Issued by: NWS Tucson, AZ
Area: Storm-based polygon

County Pima County, AZ

The radar

The Tucson radar (KEMX), 107 km from the middle of the area, began a volume at 02:21 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 00:00Z, 2.4 hours before the alert went out and 98 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: 188 J/kg
Mixed-layer CIN: -305 J/kg
Mixed-layer LCL: 3009 m above ground
0-6 km bulk shear: 10 kt
0-1 km storm-relative helicity: 21 m²/s²
0-3 km storm-relative helicity: 24 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.

832 
WUUS55 KTWC 100221
SVRTWC
AZC019-100315-
/O.NEW.KTWC.SV.W.0041.110710T0221Z-110710T0315Z/

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

THE NATIONAL WEATHER SERVICE IN TUCSON HAS ISSUED A

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

* UNTIL 815 PM MST

* AT 712 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING GOLF BALL SIZE HAIL...AND
  DESTRUCTIVE WINDS IN EXCESS OF 70 MPH.  THIS STORM WAS LOCATED IN
  SOUTHERN PORTIONS OF THE TOHONO O'ODHAM NATION NEAR SAN MIGUEL...OR
  23 MILES SOUTHEAST OF SELLS...AND MOVING NORTHWEST AT 5 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  CHOULIC...SOUTH KOMELIK AND FRESNAL CANYON

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3153 11172 3153 11174 3155 11177 3178 11190
      3188 11155 3159 11157 3152 11171
TIME...MOT...LOC 0220Z 150DEG 6KT 3163 11171

$$

MEYER

2 follow-up statements

855 
WWUS55 KTWC 100244
SVSTWC

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

AZC019-100315-
/O.CON.KTWC.SV.W.0041.000000T0000Z-110710T0315Z/
PIMA AZ-
744 PM MST SAT JUL 9 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 815 PM MST
FOR SOUTH CENTRAL PIMA COUNTY...

AT 740 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING GOLF BALL SIZE
HAIL...AND DESTRUCTIVE WINDS IN EXCESS OF 70 MPH.  THIS STORM WAS 
LOCATED NEAR SAN MIGUEL AND NEWFIELDS...OR ABOUT 25 MILES SOUTHEAST 
OF SELLS...MOVING NORTHWEST AT 5 MPH.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEEK SHELTER INDOORS. EXPECT DAMAGING WINDS IN EXCESS OF 70 
MPH...LARGE HAIL...FREQUENT LIGHTNING...AND VERY HEAVY RAIN WITH 
THIS STORM.

&&

LAT...LON 3153 11172 3153 11174 3155 11177 3178 11190
      3188 11155 3159 11157 3152 11171
TIME...MOT...LOC 0243Z 142DEG 5KT 3160 11170

$$

MEYER

662 
WWUS55 KTWC 100308
SVSTWC

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

AZC019-100317-
/O.EXP.KTWC.SV.W.0041.000000T0000Z-110710T0315Z/
PIMA AZ-
808 PM MST SAT JUL 9 2011

...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL PIMA COUNTY WILL
EXPIRE AT 815 PM MST...

AT 807 PM MST THE THUNDERSTORMS IN SOUTH CENTRAL PORTIONS OF THE 
TOHONO O'ODHAM NATION HAD WEAKENED TO BELOW SEVERE LEVELS. HEAVY 
RAIN CONTINUED IN AREAS JUST EAST AND NORTHEAST OF SAN MIGUEL...AND 
A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 915 PM MST.

LAT...LON 3153 11172 3153 11174 3155 11177 3178 11190
      3188 11155 3159 11157 3152 11171
TIME...MOT...LOC 0307Z 142DEG 5KT 3163 11172

$$

MEYER

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 9, 5:00 PM MST	Areal Flood Advisory	TWC	Pima, Pinal	2 hr
Jul 9, 5:23 PM MST	Flash Flood Warning	TWC	Pima, Pinal	112 min
Jul 9, 6:10 PM MST	Areal Flood Advisory	TWC	Cochise	110 min
Jul 9, 7:15 PM MST	Flash Flood Warning	TWC	Pima	2 hr
Jul 9, 7:30 PM MST	Areal Flood Advisory	TWC	Pima	3 hr
Jul 10, 12:08 AM MST	Areal Flood Advisory	TWC	Pima	3 hr
Jul 10, 12:37 PM MST	Special Weather Statement	TWC		38 min
Jul 10, 1:11 PM MST	Areal Flood Advisory	TWC	Pima, Santa Cruz	5 hr
Jul 10, 2:03 PM MST	Flash Flood Warning	TWC	Cochise	117 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.