Alert archive / Arizona / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 110, NWS Tucson, AZ

September 10, 2012Pima County, Arizona

NWS Tucson, AZ issued this severe thunderstorm warning at Sep 10, 2012, 5:25 PM MST for Pima County, Arizona. It was in force for 35 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: Sep 10, 2012, 5:25 PM MST (00:25 UTC)
Expired: Sep 10, 2012, 6:00 PM MST
In force: 35 min
Issued by: NWS Tucson, AZ
Area: Storm-based polygon

County Pima County, AZ

The radar

The Tucson radar (KEMX), 129 km from the middle of the area, began a volume at 00:26 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, 0.4 hours before the alert went out and 114 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: 135 J/kg
Mixed-layer CIN: -176 J/kg
Mixed-layer LCL: 1965 m above ground
0-6 km bulk shear: 14 kt
0-1 km storm-relative helicity: 92 m²/s²
0-3 km storm-relative helicity: 124 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.

982 
WUUS55 KTWC 110025
SVRTWC
AZC019-110100-
/O.NEW.KTWC.SV.W.0110.120911T0025Z-120911T0100Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TUCSON AZ
525 PM MST MON SEP 10 2012

THE NATIONAL WEATHER SERVICE IN TUCSON HAS ISSUED A

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

* UNTIL 600 PM MST

* AT 517 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 VAMORI...OR 14 MILES 
  SOUTH OF SELLS...AND MOVING WEST AT 5 MPH.

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

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 3167 11204 3180 11205 3181 11190 3169 11190
TIME...MOT...LOC 0025Z 086DEG 3KT 3172 11196

$$

2 follow-up statements

174 
WWUS55 KTWC 110039
SVSTWC

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TUCSON AZ
539 PM MST MON SEP 10 2012

AZC019-110100-
/O.CON.KTWC.SV.W.0110.000000T0000Z-120911T0100Z/
PIMA AZ-
539 PM MST MON SEP 10 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 600 PM MST
FOR SOUTH CENTRAL PIMA COUNTY...

AT 531 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 VAMORI...OR 15 MILES 
SOUTH OF SELLS...MOVING WEST AT 5 MPH.

LAT...LON 3168 11198 3180 11202 3181 11190 3169 11190
TIME...MOT...LOC 0038Z 086DEG 3KT 3172 11197

$$

059 
WWUS55 KTWC 110100
SVSTWC

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TUCSON AZ
600 PM MST MON SEP 10 2012

AZC019-110110-
/O.EXP.KTWC.SV.W.0110.000000T0000Z-120911T0100Z/
PIMA AZ-
600 PM MST MON SEP 10 2012

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

DOPPLER RADAR INDICATED THAT THE STORM BETWEEN COWLIC AND VAMORI HAS 
WEAKENED BELOW SEVERE LIMITS. HEAVY RAIN THAT ACCOMPANIED THIS STORM 
MAY LEAD TO FLASH FLOODING. THIS AREA IS UNDER A FLASH FLOOD WARNING 
THROUGH 8 PM.

LAT...LON 3168 11198 3180 11202 3181 11190 3169 11190
TIME...MOT...LOC 0100Z 086DEG 3KT 3172 11199

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 10, 5:03 PM MST	Flash Flood Warning	TWC	Pima	5 hr
Sep 10, 5:23 PM MST	Severe Thunderstorm Warning	TWC	Pima	37 min
Sep 10, 6:09 PM MST	Severe Thunderstorm Warning	TWC	Pima	25 min
Sep 10, 6:23 PM MST	Special Weather Statement	TWC		52 min
Sep 10, 9:20 PM MST	Areal Flood Advisory	TWC	Pinal	115 min
Sep 10, 9:53 PM MST	Areal Flood Advisory	TWC	Pima	112 min
Sep 10, 10:26 PM MST	Areal Flood Warning	TWC	Pima	14 hr
Sep 11, 2:17 AM MST	Flash Flood Watch	TWC	Cochise, Graham, Greenlee, Pima, Pinal, Santa Cruz	13 hr
Sep 11, 1:32 PM MST	Areal Flood Advisory	TWC	Pima	88 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.