Alert archive / Arizona / Severe Thunderstorm Warnings in 1997
Severe Thunderstorm Warning 38, NWS Phoenix, AZ
NWS Phoenix, AZ issued this severe thunderstorm warning at Aug 4, 1997, 4:40 PM MST for Gila County, Arizona. It was in force for 60 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 4, 1997, 4:40 PM MST (23:40 UTC)
- Expired
- Aug 4, 1997, 5:40 PM MST
- In force
- 60 min
- Issued by
- NWS Phoenix, AZ
- Area
- Whole counties
County Gila County, AZ
The radar
The Flagstaff radar (KFSX), 93 km from the middle of the area, began a volume at 23:40 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, 11.7 hours before the alert went out and 181 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
- 481 J/kg
- Mixed-layer CIN
- -166 J/kg
- Mixed-layer LCL
- 1666 m above ground
- 0-6 km bulk shear
- 16 kt
- 0-1 km storm-relative helicity
- 9 m²/s²
- 0-3 km storm-relative helicity
- 68 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KPHX 042341 RRA SVRPHX AZC007-050040- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE PHOENIX AZ 440 PM MST MON AUG 4 1997 * SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN GILA COUNTY IN CENTRAL ARIZONA * UNTIL 540 PM MST * SOME LOCATIONS AFFECTED ROOSEVELT LAKE TONTO NATIONAL MONUMENT * AT 440 PM MST RADAR INDICATED A SEVERE THUNDERSTORM NEAR ROOSEVELT LAKE. MOVEMENT WAS TO THE NORTH AT 10 MPH. STRONG DAMAGING WINDS ARE LIKELY WITH THIS STORM.
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 4, 1:05 PM MST, 3 hours 35 minutes before
AZZ020>025-CAZ030>033-050130- SEVERE WEATHER OUTLOOK NATIONAL WEATHER SERVICE PHOENIX AZ 1 PM MST/PDT MON AUG 4 1997 ...THERE IS A MODERATE RISK OF SEVERE THUNDERSTORMS OVER MARICOPA... NORTHWEST PINAL AND SOUTHERN GILA COUNTIES LATE THIS AFTERNOON AND THIS EVENING... A SIGNIFICANT INCREASE IN MOISTURE TOOK PLACE DURING THE WEEKEND ACROSS CENTRAL AND SOUTHWEST ARIZONA. THIS MOISTURE COMBINED WITH WARM AFTERNOON TEMPERATURES WILL RESULT IN A VERY UNSTABLE AIR MASS ACROSS THE OUTLOOK AREA. STRONG AND POSSIBLY SEVERE THUNDERSTORMS ARE EXPECTED TO DEVELOP THIS AFTERNOON OVER THE HIGHER TERRAIN OF SOUTHEAST ARIZONA. THESE STORMS WILL GRADUALLY MOVE TOWARD THE NORTHWEST AND POSSIBLY MOVE INTO PORTIONS OF NORTHWEST PINAL AND MARICOPA COUNTIES THIS EVENING. THE MAIN THREAT FROM THESE STORMS WILL BE VERY HEAVY RAINFALL AND SEVERE WINDS. A FEW STORMS MAY CONTINUE INTO THE NIGHT TIME HOURS WITH HEAVY RAINS BEING THE PRIMARY THREAT AFTER MIDNIGHT. SCATTERED THUNDERSTORMS WILL DEVELOP ACROSS SOUTHERN GILA COUNTY LATER THIS AFTERNOON WITH A FEW STORMS PRODUCING LOCALLY HEAVY RAINFALL AND POSSIBLY SEVERE WINDS. ISOLATED THUNDERSTORMS MAY DEVELOP ACROSS EASTERN SECTIONS YUMA AND LA PAZ COUNTIES. HOWEVER...NO SEVERE WEATHER IS EXPECTED WITH THESE STORMS. .................................................................... THE OUTLOOK AREA INCLUDES THE FOLLOWING COUNTIES... IN ARIZONA IN CALIFORNIA MARICOPA YUMA IMPERIAL SOUTHERN GILA LA PAZ CENTRAL/EASTERN RIVERSIDE NORTHWEST PINAL
The office that day
Everything else NWS Phoenix, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 4, 3:25 PM MST | Severe Thunderstorm Warning | PSR | Pinal | 65 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.