Alert archive / Arizona / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 64, NWS Phoenix, AZ
NWS Phoenix, AZ issued this severe thunderstorm warning at Aug 13, 1998, 5:17 PM MST for Maricopa County, Arizona. It was in force for 63 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 13, 1998, 5:17 PM MST (00:17 UTC)
- Expired
- Aug 13, 1998, 6:20 PM MST
- In force
- 63 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 00:16 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 13, 5:45 PM MST | Thunderstorm Wind 50 | Wickenburg, AZ | Winds uprooted trees and took down power poles in Wickenburg. |
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 watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Aug 13, 3:00 PM MST | Severe Thunderstorm Watch | SPC | 6 hr |
The nearest sounding before it
Tuscon, AZ (KTUS), launched 00:00Z, 0.3 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
- 546 J/kg
- Mixed-layer CIN
- -22 J/kg
- Mixed-layer LCL
- 2417 m above ground
- 0-6 km bulk shear
- 25 kt
- 0-1 km storm-relative helicity
- 75 m²/s²
- 0-3 km storm-relative helicity
- 127 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 3.1
The text
As transmitted, in the capitals the NWS used until 2016.
572 WUUS1 KPHX 140019 RRA SVRPHX AZC013-140120- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE PHOENIX AZ 517 PM MST THU AUG 13 1998 THE NATIONAL WEATHER SERVICE IN PHOENIX HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN MARICOPA COUNTY IN CENTRAL ARIZONA * UNTIL 620 PM MST * AT 515 PM MST DOPPLER RADAR INDICATED A LINE OF STRONG TO SEVERE THUNDERSTORM THUNDERSTORMS EXTENDING FROM 10 MILES EAST OF WICKENBURG TO 15 MILES NORTHWEST OF WICKENBURG. MOVEMENT WAS TO THE SOUTH-SOUTHWEST AT 15 MPH. * SOME LOCATIONS AFFECTED INCLUDE WICKENBURG MORRISTOWN CIRCLE CITY STRONG DAMAGING WINDS ARE LIKELY WITH THIS STORM ALONG WITH VERY HEAVY RAIN AND POSSIBLE LARGE HAIL.
The office that day
Everything else NWS Phoenix, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 13, 7:28 PM MST | Severe Thunderstorm Warning | PSR | La Paz | 47 min |
| Aug 13, 9:04 PM MST | Severe Thunderstorm Warning | PSR | Pinal | 46 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.