Alert archive / Arizona / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 17, NWS Phoenix, AZ
NWS Phoenix, AZ issued this severe thunderstorm warning at Jul 17, 1998, 9:15 PM MST for Gila County, Maricopa County, Arizona. It was in force for 80 min. 3 reports 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
- Jul 17, 1998, 9:15 PM MST (04:15 UTC)
- Expired
- Jul 17, 1998, 10:35 PM MST
- In force
- 80 min
- Issued by
- NWS Phoenix, AZ
- Area
- Whole counties
Counties Gila County, AZ, Maricopa County, AZ
The radar
The Phoenix radar (KIWA), 32 km from the middle of the area, began a volume at 04:15 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 |
|---|---|---|---|
| Jul 17, 9:22 PM MST | Thunderstorm Wind 61 | Roosevelt, AZ | |
| Jul 17, 10:31 PM MST | Thunderstorm Wind 50 | Gilbert, AZ | Two TV antennas blown down, street signs blown down. |
| Jul 17, 10:42 PM MST | Thunderstorm Wind 50 | Scottsdale, AZ | Power lines down, numerous trees down. |
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, 4.3 hours before the alert went out and 171 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
- 979 J/kg
- Mixed-layer CIN
- -1 J/kg
- Mixed-layer LCL
- 3214 m above ground
- 0-6 km bulk shear
- 19 kt
- 0-1 km storm-relative helicity
- 15 m²/s²
- 0-3 km storm-relative helicity
- 38 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.8
The text
The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.
The office that day
Everything else NWS Phoenix, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 17, 5:20 PM MST | Severe Thunderstorm Warning | PSR | Maricopa | 50 min |
| Jul 17, 6:01 PM MST | Severe Thunderstorm Warning | PSR | Maricopa | 69 min |
| Jul 17, 9:41 PM MST | Severe Thunderstorm Warning | PSR | Yuma | 64 min |
| Jul 17, 9:53 PM MST | Severe Thunderstorm Warning | PSR | Maricopa, Pinal | 52 min |
| Jul 17, 10:41 PM MST | Severe Thunderstorm Warning | PSR | Maricopa, Pinal | 64 min |
| Jul 17, 11:23 PM MST | Severe Thunderstorm Warning | PSR | Maricopa | 52 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.