Alert archive / Arizona / Severe Thunderstorm Warnings in 2007

Severe Thunderstorm Warning 39, NWS Tucson, AZ

July 21, 2007Pinal County, Arizona

NWS Tucson, AZ issued this severe thunderstorm warning at Jul 21, 2007, 5:25 PM MST for Pinal County, Arizona. It was in force for 50 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 21, 2007, 5:25 PM MST (00:25 UTC)
Expired: Jul 21, 2007, 6:15 PM MST
In force: 50 min
Issued by: NWS Tucson, AZ
Area: Counties, with a storm outline in the text

County Pinal County, AZ

The radar

The Tucson radar (KEMX), 89 km from the middle of the area, began a volume at 00:27 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 65 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: 481 J/kg
Mixed-layer CIN: -32 J/kg
Mixed-layer LCL: 1924 m above ground
0-6 km bulk shear: 14 kt
0-1 km storm-relative helicity: -36 m²/s²
0-3 km storm-relative helicity: -1 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.

000 
WUUS55 KTWC 220026
SVRTWC
AZC021-220115-
/O.NEW.KTWC.SV.W.0039.070722T0025Z-070722T0115Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TUCSON AZ
525 PM MST SAT JUL 21 2007

THE NATIONAL WEATHER SERVICE IN TUCSON HAS ISSUED A

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

* UNTIL 615 PM MST

* AT 518 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING PENNY SIZE HAIL...AND   
  DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED 7 MILES   
  EAST OF MAMMOTH...AND MOVING WEST AT 10 MPH.

LAT...LON 3256 11047 3288 11046 3292 11076 3255 11077

$$

WEATHER.GOV/TUCSON

2 follow-up statements

000 
WWUS55 KTWC 220041
SVSTWC

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TUCSON AZ
539 PM MST SAT JUL 21 2007

AZC021-220115-
/O.CON.KTWC.SV.W.0039.000000T0000Z-070722T0115Z/
PINAL AZ-
539 PM MST SAT JUL 21 2007

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 615 PM MST
FOR EAST CENTRAL PINAL COUNTY...

AT 538 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING PENNY SIZE 
HAIL...DAMAGING WINDS IN EXCESS OF 60 MPH...AND LOCALLY HEAVY 
RAINFALL. THIS STORM WAS LOCATED NEAR MAMMOTH...OR ABOUT 29 MILES 
NORTHEAST OF ORO VALLEY...MOVING WEST AT 10 MPH.

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO 
MAMMOTH...AND STATE HIGHWAY 77 SOUTH OF ARAVAIPA CREEK PRESERVE AND 
DUDLEYVILLE.

LAT...LON 3256 11047 3288 11046 3292 11076 3255 11077

$$

000 
WWUS55 KTWC 220116
SVSTWC

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TUCSON AZ
613 PM MST SAT JUL 21 2007

AZC021-220123-
/O.EXP.KTWC.SV.W.0039.000000T0000Z-070722T0115Z/
PINAL AZ-
613 PM MST SAT JUL 21 2007

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL PINAL COUNTY
EXPIRES AT 615 PM MST...

THE STRONG STORMS THAT PROMPTED THE SEVERE THUNDERSTORM WARNING FOR 
EAST CENTRAL PINAL COUNTY HAVE WEAKENED AND HAVE FALLEN BELOW SEVERE 
LEVELS. THEREFORE...THE SEVERE THUNDERSTORM WARNING WILL BE ALLOWED 
TO EXPIRE AT 615 PM MST. HOWEVER...THESE STORMS HAVE PRODUCED VERY 
HEAVY RAINFALL ALONG HIGHWAY 77 AND ACROSS THE NORTHERN PORTIONS OF 
THE SANTA CATALINA MOUNTAINS. MOTORISTS SHOULD EXERCISE CAUTION ON 
THE WET ROADWAYS AND NEVER ATTEMPT TO CROSS THROUGH WATER OF UNKNOWN 
DEPTH RUNNING IN A ROADWAY DIP.

LAT...LON 3256 11047 3288 11046 3292 11076 3255 11077

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 21, 6:15 PM MST	Areal Flood Advisory	TWC	Santa Cruz	2 hr
Jul 21, 6:38 PM MST	Flash Flood Warning	TWC	Pima, Pinal	2 hr
Jul 21, 7:09 PM MST	Flash Flood Warning	TWC	Pima	96 min
Jul 21, 7:16 PM MST	Severe Thunderstorm Warning	TWC	Pima	44 min
Jul 21, 7:28 PM MST	Areal Flood Advisory	TWC	Graham, Pima, Pinal	92 min
Jul 21, 8:40 PM MST	Areal Flood Advisory	TWC	Pima, Pinal	95 min
Jul 21, 11:04 PM MST	Areal Flood Advisory	TWC	Pima, Pinal	3 hr
Jul 22, 1:21 PM MST	Areal Flood Advisory	TWC	Santa Cruz	84 min

Nearby

Severe Thunderstorm Warnings in Arizona, 2007 Every severe thunderstorm warning in 2007

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.