Alert archive / Arizona / Severe Thunderstorm Warnings in 2007

Severe Thunderstorm Warning 21, NWS Tucson, AZ

July 18, 2007Pima County, Arizona

NWS Tucson, AZ issued this severe thunderstorm warning at Jul 18, 2007, 4:24 PM MST for Pima County, Arizona. It was in force for 66 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 18, 2007, 4:24 PM MST (23:24 UTC)
Expired: Jul 18, 2007, 5:30 PM MST
In force: 66 min
Issued by: NWS Tucson, AZ
Area: Counties, with a storm outline in the text

County Pima County, AZ

The radar

The Tucson radar (KEMX), 25 km from the middle of the area, began a volume at 23:24 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 12:00Z, 11.4 hours before the alert went out and 23 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: 299 J/kg
Mixed-layer CIN: -278 J/kg
Mixed-layer LCL: 2493 m above ground
0-6 km bulk shear: 12 kt
0-1 km storm-relative helicity: -18 m²/s²
0-3 km storm-relative helicity: 39 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 182326
SVRTWC
AZC019-190030-
/O.NEW.KTWC.SV.W.0021.070718T2324Z-070719T0030Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TUCSON AZ
424 PM MST WED JUL 18 2007

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 530 PM MST

* AT 418 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN         
  EXCESS OF 60 MPH. THIS STORM WAS JUST EAST OF GREEN VALLEY AND     
  MOVING WEST AT 5 TO 10 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO THE  
  SAN XAVIER MISSION AND POSSIBLY THE THREE POINTS AREA. 

IN ADDITION TO SMALL HAIL AND DAMAGING WINDS...CLOUD TO GROUND 
LIGHTNING IS OCCURRING WITH THIS STORM. MOVE INDOORS IMMEDIATELY 
LIGHTNING IS ONE OF NATURES NUMBER ONE KILLERS. REMEMBER...IF YOU 
CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE STRUCK BY LIGHTNING.

THIS STORM WILL PRODUCE DAMAGING WINDS AND BLOWING DUST. BE PREPARED
FOR SUDDEN CHANGES IN VISIBILITY AND WIND GUSTS OF 60 MPH OR GREATER.

LAT...LON 3174 11065 3222 11054 3223 11073 3213 11132
      3174 11142

$$

WEATHER.GOV/TUCSON
MOLLERE

2 follow-up statements

000 
WWUS55 KTWC 182357
SVSTWC

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TUCSON AZ
455 PM MST WED JUL 18 2007

AZC019-190030-
/O.CON.KTWC.SV.W.0021.000000T0000Z-070719T0030Z/
PIMA AZ-
455 PM MST WED JUL 18 2007

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 530 PM MST
FOR EAST CENTRAL PIMA COUNTY...

AT 448 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 SAHUARITA AND GREEN 
VALLEY AND IS MOVING EAST AT 5 TO 10 MPH.

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO SAN 
XAVIER MISSION AND POSSIBLY THE THREE POINTS AREA. 

IN ADDITION TO SMALL HAIL AND DAMAGING WINDS...CLOUD TO GROUND 
LIGHTNING IS OCCURRING WITH THIS STORM. MOVE INDOORS IMMEDIATELY 
LIGHTNING IS ONE OF NATURES NUMBER ONE KILLERS. REMEMBER...IF YOU 
CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE STRUCK BY LIGHTNING.

LAT...LON 3174 11065 3222 11054 3223 11073 3213 11132
      3174 11142

$$

MOLLERE

000 
WWUS55 KTWC 190027
SVSTWC

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TUCSON AZ
527 PM MST WED JUL 18 2007

AZC019-190035-
/O.EXP.KTWC.SV.W.0021.000000T0000Z-070719T0030Z/
PIMA AZ-
527 PM MST WED JUL 18 2007

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL PIMA COUNTY
EXPIRES AT 530 PM MST...

THE CLUSTER OF STORMS THAT MOVED OVER GREEN VALLEY AND SAHUARITA 
EARLIER THIS AFTERNOON HAS DECREASED IN INTENSITY. THEREFORE THE 
SEVERE THUNDERSTORM WARNING WILL BE ALLOWED TO EXPIRE AT 530 PM MST. 
 
STORMS WILL CONTINUE IN THIS AREA FOR ANOTHER HOUR OR SO. 

LAT...LON 3174 11065 3222 11054 3223 11073 3213 11132
      3174 11142

$$

MOLLERE

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 17, 5:27 PM MST	Areal Flood Advisory	TWC	Pima	93 min
Jul 17, 5:40 PM MST	Areal Flood Advisory	TWC	Pima	93 min
Jul 18, 2:55 PM MST	Severe Thunderstorm Warning	TWC	Cochise	36 min
Jul 18, 3:28 PM MST	Severe Thunderstorm Warning	TWC	Pima	62 min
Jul 18, 4:11 PM MST	Severe Thunderstorm Warning	TWC	Cochise	34 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.