Alert archive / Arizona / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 6, NWS Phoenix, AZ

July 9, 1997Maricopa County, Arizona

NWS Phoenix, AZ issued this severe thunderstorm warning at Jul 9, 1997, 2:54 PM MST for Maricopa County, Arizona. It was in force for 61 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Jul 9, 1997, 2:54 PM MST (21:54 UTC)
Expired: Jul 9, 1997, 3:55 PM MST
In force: 61 min
Issued by: NWS Phoenix, AZ
Area: Whole counties

County Maricopa County, AZ

The nearest sounding before it

Tuscon, AZ (KTUS), launched 12:00Z, 9.9 hours before the alert went out and 198 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: 18 J/kg
Mixed-layer CIN: -333 J/kg
Mixed-layer LCL: 3368 m above ground
0-6 km bulk shear: 9 kt
0-1 km storm-relative helicity: 11 m²/s²
0-3 km storm-relative helicity: 17 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 
TTAA00 KPHX 092154 RRA
SVRPHX
AZC013-092255-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE PHOENIX AZ
254 PM MST WED JUL 9 1997

*  SEVERE THUNDERSTORM WARNING FOR
   WESTERN MARICOPA COUNTY IN CENTRAL ARIZONA

*  UNTIL 355 PM MST

*  SOME LOCATIONS AFFECTED
   GILA BEND
 
AT 245 PM MST RADAR INDICATED A SEVERE THUNDERSTORM
ABOUT 10 MILES EAST OF GILA BEND.  MOVEMENT WAS TO THE
NORTH AT 5 TO 10 MPH.
 
MOTORISTS DRIVING HIGH PROFILE VEHICLES SHOULD DELAY TRAVELING
UNTIL THE HIGH WINDS...POSSIBLY IN EXCESS OF 60 MPH...DIMINISH
LATER THIS AFTERNOON.

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 9, 3:55 PM MST	Severe Thunderstorm Warning	PSR	Maricopa	45 min
Jul 9, 4:15 PM MST	Severe Thunderstorm Warning	PSR	Maricopa, Pinal	105 min

Nearby

Severe Thunderstorm Warnings in Arizona, 1997 Every severe thunderstorm warning in 1997

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.