Alert archive / Arizona / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 44, NWS Phoenix, AZ

August 7, 1997Gila County, Pinal County, Arizona

NWS Phoenix, AZ issued this severe thunderstorm warning at Aug 7, 1997, 5:14 PM MST for Gila County, Pinal 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
Aug 7, 1997, 5:14 PM MST (00:14 UTC)
Expired
Aug 7, 1997, 6:15 PM MST
In force
61 min
Issued by
NWS Phoenix, AZ
Area
Whole counties

Counties Gila County, AZ, Pinal County, AZ

The radar

The Phoenix radar (KIWA), 55 km from the middle of the area, began a volume at 00:17 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, 0.2 hours before the alert went out and 132 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-pSkew-T log-p diagram, Tuscon, AZ at 00:00Z on 1997-08-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 923 joules per kilogram.LCLEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Tuscon, AZ at 00:00Z on 1997-08-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -8 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
923 J/kg
Mixed-layer CIN
-2 J/kg
Mixed-layer LCL
2796 m above ground
0-6 km bulk shear
14 kt
0-1 km storm-relative helicity
-8 m²/s²
0-3 km storm-relative helicity
26 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

In the hours before

Special weather statement, Aug 7, 12:55 PM MST, 4 hours 19 minutes before
AZZ020>025-CAZ030>033-072145-

SEVERE WEATHER OUTLOOK
NATIONAL WEATHER SERVICE PHOENIX AZ
1250 PM MST/PDT THU AUG 7 1997

...THUNDERSTORMS...A FEW SEVERE...ARE POSSIBLE FOR SOUTHWEST
AND SOUTH-CENTRAL ARIZONA...AND FAR SOUTHEAST CALIFORNIA LATER
THIS AFTERNOON AND DURING THE EVENING HOURS...

THUNDERSTORMS  ARE  EXPECTED  TO  DEVELOP  ACROSS  SOUTH-CENTRAL  AND
SOUTHWEST ARIZONA...AND FAR SOUTHEAST CALIFORNIA. THERE WILL BE
A SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS THE ENTIRE OUTLOOK
AREA.

SEVERE THUNDERSTORMS IMPLY...DAMAGING WINDS IN EXCESS OF 58 MPH
...AND/OR...HAIL...THREE-QUARTERS OF AN INCH OR MORE IN DIAMETER.

AT THIS TIME...IT APPEARS THE OUTLOOK AREA MOST AT RISK FOR
SEVERE  WEATHER   WILL  BE  SOUTHWEST   ARIZONA...AND  FAR  SOUTHEAST
CALIFORNIA.

THE  PRIMARY  THREAT FROM  SEVERE  THUNDERSTORMS  THIS AFTERNOON  AND
EVENING WILL BE DAMAGING WINDS. THE STORMS COULD ALSO BE
ACCOMPANIED BY LOCALLY HEAVY RAINFALL...AND FREQUENT AND
DEADLY LIGHTNING.

AN  UPDATED  SEVERE  WEATHER OUTLOOK  FOR  THE  PHOENIX  NWS AREA  OF
RESPONSIBILITY WILL BE ISSUED AT 245 PM MST/PDT THIS AFTERNOON.

.....................................................................

THE OUTLOOK AREA INCLUDES THE FOLLOWING COUNTIES...

IN ARIZONA                              IN CALIFORNIA

MARICOPA            YUMA                IMPERIAL
NORTHWEST PINAL     LA PAZ              CENTRAL AND EASTERN RIVERSIDE
SOUTHERN GILA

FRANJEVIC
Special weather statement, Aug 7, 2:53 PM MST, 2 hours 21 minutes before
AZZ020>025-CAZ030>033-080130-

SEVERE WEATHER OUTLOOK
NATIONAL WEATHER SERVICE PHOENIX AZ
255 PM MST/PDT THU AUG 7 1997

...THUNDERSTORMS...A FEW SEVERE...ARE POSSIBLE FOR SOUTHWEST
AND  SOUTH-CENTRAL  ARIZONA...AND   FAR  SOUTHEAST  CALIFORNIA   THIS
AFTERNOON AND EVENING.

STRONG THUNDERSTORMS WERE DEVELOPING OVER THE HIGHER TERRAIN
NORTH AND NORTHEAST OF THE OUTLOOK AREA. THE THUNDERSTORMS WILL
MOVE SOUTH-SOUTHWEST FROM THE HIGHER TERRAIN TO SOUTH-CENTRAL
AND SOUTHWEST ARIZONA...AND EVENTUALLY FAR SOUTHEAST CALIFORNIA.

THE THUNDERSTORMS WILL CONTINUE TO INTENSIFY THIS AFTERNOON...
WITH A SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS THE ENTIRE
OUTLOOK AREA LATER THIS AFTERNOON AND EVENING.

SEVERE THUNDERSTORMS IMPLY...DAMAGING WINDS IN EXCESS OF 58 MPH
...AND/OR...HAIL...THREE-QUARTERS OF AN INCH OR MORE IN DIAMETER.

THE  PRIMARY  THREAT FROM  SEVERE  THUNDERSTORMS  THIS AFTERNOON  AND
EVENING WILL BE DAMAGING WINDS. THE STORMS COULD ALSO BE
ACCOMPANIED BY LOCALLY HEAVY RAINFALL...AND FREQUENT AND
DEADLY LIGHTNING.

.....................................................................

THE OUTLOOK AREA INCLUDES THE FOLLOWING COUNTIES...

IN ARIZONA                   n           IN CALIFORNIA

MARICOPA            YUMA                IMPERIAL
NORTHWEST PINAL     LA PAZ              CENTRAL AND EASTERN RIVERSIDE
SOUTHERN GILA

FRANJEVIC

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 7, 5:28 PM MSTSevere Thunderstorm WarningPSRLa Paz87 min
Aug 7, 6:38 PM MSTSevere Thunderstorm WarningPSRLa Paz62 min
Aug 7, 6:56 PM MSTSevere Thunderstorm WarningPSRLa Paz, Yuma59 min
Aug 8, 4:25 PM MSTSevere Thunderstorm WarningPSRGila65 min

Nearby

Severe Thunderstorm Warnings in Arizona, 1997Every 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; radar from the NEXRAD Level II archive.