Alert archive / Arizona / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 49, NWS Tucson, AZ

July 20, 2011Pima County, Arizona

NWS Tucson, AZ issued this severe thunderstorm warning at Jul 20, 2011, 6:35 PM MST for Pima County, Arizona. It was in force for 25 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 20, 2011, 6:35 PM MST (01:35 UTC)
Expired: Jul 20, 2011, 7:00 PM MST
In force: 25 min
Issued by: NWS Tucson, AZ
Area: Storm-based polygon

County Pima County, AZ

The radar

The Tucson radar (KEMX), 32 km from the middle of the area, began a volume at 01:38 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, 1.6 hours before the alert went out and 28 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: 10 J/kg
Mixed-layer CIN: -40 J/kg
Mixed-layer LCL: 3126 m above ground
0-6 km bulk shear: 7 kt
0-1 km storm-relative helicity: -18 m²/s²
0-3 km storm-relative helicity: 27 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.

572 
WUUS55 KTWC 210135
SVRTWC
AZC019-210200-
/O.NEW.KTWC.SV.W.0049.110721T0135Z-110721T0200Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TUCSON AZ
635 PM MST WED JUL 20 2011

THE NATIONAL WEATHER SERVICE IN TUCSON HAS ISSUED A

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

* UNTIL 700 PM MST

* AT 629 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 7 MILES NORTHEAST OF SAGUARO
  NATIONAL PARK EAST...OR 18 MILES EAST OF TUCSON...AND MOVING WEST
  AT 10 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  VAIL...SEVEN FALLS...CORONA DE TUCSON...SABINO CANYON AND RITA
  RANCH

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEEK SHELTER INDOORS. EXPECT DAMAGING WINDS IN EXCESS OF 60 MPH
ACCOMPANIED BY BLOWING DUST AND LIMITED VISIBILITIES.

&&

LAT...LON 3221 11046 3193 11046 3193 11063 3193 11079
      3239 11082 3240 11069 3243 11047
TIME...MOT...LOC 0134Z 087DEG 8KT 3222 11065

$$

BF

1 follow-up statement

173 
WWUS55 KTWC 210208
SVSTWC

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TUCSON AZ
708 PM MST WED JUL 20 2011

AZC019-210211-
/O.EXP.KTWC.SV.W.0049.000000T0000Z-110721T0200Z/
PIMA AZ-
708 PM MST WED JUL 20 2011

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

AT 701 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED 
SCATTERED THUNDERSTORMS IN THE VICINITY OF THE RINCON MOUNTAINS AS 
WELL AS SAGUARO NATIONAL PARK EAST ON THE FAR EAST SIDE OF THE 
TUCSON METRO AREA. THE THUNDERSTORMS WERE MOVING TO THE WEST AT 5 
MPH. DOPPLER RADAR INDICATED THAT THE THUNDERSTORMS HAD WEAKENED. 
HOWEVER...BRIEF WIND GUSTS TO AROUND 45 MPH MAY YET OCCUR 
PARTICULARLY ACROSS THE EASTERN PORTION OF THE TUCSON METRO AREA 
THROUGH 8 PM MST.

LAT...LON 3221 11046 3193 11046 3193 11063 3193 11079
      3239 11082 3240 11069 3243 11047
TIME...MOT...LOC 0135Z 087DEG 8KT 3222 11065

$$

BF

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 20, 5:17 PM MST	Special Weather Statement	TWC	Pinal	58 min
Jul 20, 5:49 PM MST	Areal Flood Advisory	TWC	Cochise	3 hr
Jul 20, 7:35 PM MST	Areal Flood Advisory	TWC	Pima	115 min
Jul 20, 7:43 PM MST	Flash Flood Warning	TWC	Pima	92 min
Jul 21, 12:52 PM MST	Areal Flood Advisory	TWC	Cochise	113 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.