Alert archive / Arizona / Severe Thunderstorm Warnings in 1997
Severe Thunderstorm Warning 96, NWS Phoenix, AZ
NWS Phoenix, AZ issued this severe thunderstorm warning at Sep 8, 1997, 6:31 PM MST for Maricopa County, Arizona. It was in force for 64 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
- Sep 8, 1997, 6:31 PM MST (01:31 UTC)
- Expired
- Sep 8, 1997, 7:35 PM MST
- In force
- 64 min
- Issued by
- NWS Phoenix, AZ
- Area
- Whole counties
County Maricopa County, AZ
The radar
The Phoenix radar (KIWA), 77 km from the middle of the area, began a volume at 01:32 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, 1.5 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.
- Mixed-layer CAPE
- 190 J/kg
- Mixed-layer CIN
- -2 J/kg
- Mixed-layer LCL
- 3366 m above ground
- 0-6 km bulk shear
- 16 kt
- 0-1 km storm-relative helicity
- 58 m²/s²
- 0-3 km storm-relative helicity
- 67 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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, Sep 8, 2:42 PM MST, 3 hours 49 minutes before
AZZ020>025-CAZ030>033-091130- SEVERE WEATHER OUTLOOK NATIONAL WEATHER SERVICE PHOENIX AZ 245 PM MST/PDT SUN SEP 7 1997 ...A SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS THE ENTIRE OUTLOOK AREA THIS AFTERNOON AND TONIGHT... ISOLATED TO SCATTERED THUNDERSTORMS ARE FORECAST ACROSS THE ENTIRE OUTLOOK AREA THIS AFTERNOON AND TONIGHT. THERE IS A SLIGHT RISK THAT SOME OF THESE THUNDERSTORMS COULD BECOME SEVERE. THIS INCLUDES THE FOLLOWING COUNTIES IN ARIZONA AND SOUTHEAST CALIFORNIA...SOUTHERN GILA...MARICOPA...NORTHWEST PINAL...LA PAZ...YUMA...IMPERIAL...AND EASTERN/CENTRAL RIVERSIDE. THE MAIN THREAT WITH THESE STORMS WILL BE LOCALLY HEAVY RAINFALL... STRONG GUSTY WINDS IN EXCESS OF 60 MPH...AND POSSIBLY BLOWING DUST. THE AIRMASS ACROSS THE OUTLOOK AREA REMAINS MOIST AND UNSTABLE TODAY...AND UPPER LEVEL WINDS WOULD TEND TO FAVOR THE DEVELOPMENT OF ISOLATED SEVERE THUNDERSTORMS ACROSS THE RISK AREA. IN ADDITION... ANY STORMS THAT FORM IN THE EASTERN PORTION OF THE OUTLOOK AREA TODAY AND TONIGHT WILL TEND TO BE RATHER SLOW MOVING...AND THIS WILL ENHANCE THE POTENTIAL FOR LOCALLY HEAVY RAINFALL AND FLASH FLOODING. .................................................................... FOR THE PURPOSES OF THIS OUTLOOK...SEVERE WEATHER REFERS TO ANY OF THE FOLLOWING...DAMAGING WINDS IN EXCESS OF 57 MPH...HAIL 3/4 INCH IN DIAMETER OR LARGER...AND LOCALLY HEAVY RAINFALL WHICH RESULTS IN RUNNING WASHES OR FLOODING. THE OUTLOOK AREA INCLUDES THE FOLLOWING COUNTIES... IN ARIZONA IN CALIFORNIA MARICOPA YUMA IMPERIAL NORTHWEST PINAL LA PAZ CENTRAL AND EASTERN RIVERSIDE SOUTHERN GILA ....................................................................
Special weather statement, Sep 8, 3:13 PM MST, 3 hours 18 minutes before
AZZ020>025-CAZ030>033-091130- SEVERE WEATHER OUTLOOK...CORRECTED DATE NATIONAL WEATHER SERVICE PHOENIX AZ 245 PM MST/PDT MON SEP 8 1997 ...A SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS THE ENTIRE OUTLOOK AREA THIS AFTERNOON AND TONIGHT... ISOLATED TO SCATTERED THUNDERSTORMS ARE FORECAST ACROSS THE ENTIRE OUTLOOK AREA THIS AFTERNOON AND TONIGHT. THERE IS A SLIGHT RISK THAT SOME OF THESE THUNDERSTORMS COULD BECOME SEVERE. THIS INCLUDES THE FOLLOWING COUNTIES IN ARIZONA AND SOUTHEAST CALIFORNIA...SOUTHERN GILA...MARICOPA...NORTHWEST PINAL...LA PAZ...YUMA...IMPERIAL...AND EASTERN/CENTRAL RIVERSIDE. THE MAIN THREAT WITH THESE STORMS WILL BE LOCALLY HEAVY RAINFALL... STRONG GUSTY WINDS IN EXCESS OF 60 MPH...AND POSSIBLY BLOWING DUST. THE AIRMASS ACROSS THE OUTLOOK AREA REMAINS MOIST AND UNSTABLE TODAY...AND UPPER LEVEL WINDS WOULD TEND TO FAVOR THE DEVELOPMENT OF ISOLATED SEVERE THUNDERSTORMS ACROSS THE RISK AREA. IN ADDITION... ANY STORMS THAT FORM IN THE EASTERN PORTION OF THE OUTLOOK AREA TODAY AND TONIGHT WILL TEND TO BE RATHER SLOW MOVING...AND THIS WILL ENHANCE THE POTENTIAL FOR LOCALLY HEAVY RAINFALL AND FLASH FLOODING. .................................................................... FOR THE PURPOSES OF THIS OUTLOOK...SEVERE WEATHER REFERS TO ANY OF THE FOLLOWING...DAMAGING WINDS IN EXCESS OF 57 MPH...HAIL 3/4 INCH IN DIAMETER OR LARGER...AND LOCALLY HEAVY RAINFALL WHICH RESULTS IN RUNNING WASHES OR FLOODING. THE OUTLOOK AREA INCLUDES THE FOLLOWING COUNTIES... IN ARIZONA IN CALIFORNIA MARICOPA YUMA IMPERIAL NORTHWEST PINAL LA PAZ CENTRAL AND EASTERN RIVERSIDE SOUTHERN GILA ....................................................................
The office that day
Everything else NWS Phoenix, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 8, 5:29 PM MST | Severe Thunderstorm Warning | PSR | Pinal | 61 min |
| Sep 8, 6:08 PM MST | Severe Thunderstorm Warning | PSR | Pinal | 62 min |
| Sep 8, 6:31 PM MST | Flash Flood Warning | PSR | Maricopa | 64 min |
| Sep 9, 4:36 PM MST | Severe Thunderstorm Warning | PSR | Yuma | 64 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.