Alert archive / Arizona / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 71, NWS Phoenix, AZ
NWS Phoenix, AZ issued this severe thunderstorm warning at Aug 15, 1998, 7:48 PM MST for Maricopa County, Arizona. It was in force for 62 min. 1 report came from inside the area while it was in force.
The area
The counties it named, with what was reported inside it.
The facts
- Issued
- Aug 15, 1998, 7:48 PM MST (02:48 UTC)
- Expired
- Aug 15, 1998, 8:50 PM MST
- In force
- 62 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 02:49 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Aug 15, 8:15 PM MST | Thunderstorm Wind 50 | Mesa, AZ | About 12,000 residents were left without power as winds and lightning struck the area. |
NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.
The nearest sounding before it
Tuscon, AZ (KTUS), launched 00:00Z, 2.8 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
- 485 J/kg
- Mixed-layer CIN
- -3 J/kg
- Mixed-layer LCL
- 2881 m above ground
- 0-6 km bulk shear
- 11 kt
- 0-1 km storm-relative helicity
- -27 m²/s²
- 0-3 km storm-relative helicity
- 34 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 160250 RRA SVRPHX AZC013-160350- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE PHOENIX AZ 748 PM MST SAT AUG 15 1998 THE NATIONAL WEATHER SERVICE IN PHOENIX HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR CENTRAL AND NORTHEAST MARICOPA COUNTY IN CENTRAL ARIZONA * UNTIL 850 PM MST THIS ALSO INCLUDES A CONTINUATION AND EXPANSION OF THE PREVIOUS SCOTTSDALE AND FOUNTAIN HILLS WARNING. * AT 740 MST DOPPLER RADAR INDICATED SEVERE THUNDERSTORMS OVER THE EAST VALLEY EXTENDING FROM NEAR COUNTRY CLUB DRIVE TO THE SUPERSITION MOUNTAINS. LITTLE MOVEMENT WAS INDICATED BY RADAR BUT STORMS WERE CONTINUING TO DEVELOP WESTWARD. * SOME LOCATION S AFFECTED INCLUDE MESA CHANDLER GILBERT SCOTTSDALE TEMPE STRONG DAMAGING WINDS ARE LIKELY WITH THIS STORM.
The office that day
Everything else NWS Phoenix, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 15, 5:19 PM MST | Severe Thunderstorm Warning | PSR | Gila | 61 min |
| Aug 15, 6:56 PM MST | Severe Thunderstorm Warning | PSR | Pinal | 49 min |
| Aug 15, 7:29 PM MST | Severe Thunderstorm Warning | PSR | Maricopa | 66 min |
Nearby
Severe Thunderstorm Warnings in Arizona, 1998Every severe thunderstorm warning in 1998
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.