Alert archive / Arizona / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 15, NWS Phoenix, AZ
NWS Phoenix, AZ issued this severe thunderstorm warning at Jul 17, 1998, 5:20 PM MST for Maricopa County, Arizona. It was in force for 50 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
- Jul 17, 1998, 5:20 PM MST (00:20 UTC)
- Expired
- Jul 17, 1998, 6:10 PM MST
- In force
- 50 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 00:20 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, 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
- 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.
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, Jul 17, 1:30 PM MST, 3 hours 50 minutes before
AZZ020>028-CAZ030>033-181200- MARICOPA-SOUTHERN GILA-NORTHWEST PINAL-YUMA-LA PAZ-IMPERIAL- CENTRAL/EASTERN RIVERSIDE-JOSHUA TREE NATIONAL PARK- HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE PHOENIX AZ 130 PM MST FRI JUL 17 1998 ...MODERATE RISK FOR HAZARDOUS WEATHER OVER SOUTHWEST AND SOUTH- CENTRAL ARIZONA TONIGHT... THE PRIMARY WEATHER THREAT TONIGHT WILL BE STRONG GUSTY WINDS... POSSIBLY TO AROUND 60 MPH WITH A FEW OF THE EXPECTED THUNDERSTORMS. AND BLOWING DUST ON THE DESERT MAY BRIEFLY RESTRICT VISIBILITY TO LESS THAN A QUARTER MILE. ********************************************************************* HAZARDOUS WEATHER REFERS TO ANY OF THE FOLLOWING... 1) LOCALLY HEAVY RAINFALL RESULTING IN FLASH FLOODING OR FLOODING 2) SAND OR DUST STORM REDUCING VISIBILITY TO 1/4 MILE OR LESS 3) DAMAGING WINDS IN EXCESS OF 57 MPH 4) HAIL 3/4 INCH OR LARGER IN DIAMETER CHECK THE PHOENIX STATE FORECAST DISCUSSION FOR MORE INFORMATION.
Special weather statement, Jul 17, 1:30 PM MST, 3 hours 50 minutes before
AZZ020>028-CAZ030>033-181200- MARICOPA-SOUTHERN GILA-NORTHWEST PINAL-YUMA-LA PAZ-IMPERIAL- CENTRAL/EASTERN RIVERSIDE-JOSHUA TREE NATIONAL PARK- HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE PHOENIX AZ 130 PM MST FRI JUL 17 1998 ...MODERATE RISK FOR HAZARDOUS WEATHER OVER SOUTHWEST AND SOUTH- CENTRAL ARIZONA TONIGHT... THE PRIMARY WEATHER THREAT TONIGHT WILL BE STRONG GUSTY WINDS... POSSIBLY TO AROUND 60 MPH WITH A FEW OF THE EXPECTED THUNDERSTORMS. AND BLOWING DUST ON THE DESERT MAY BRIEFLY RESTRICT VISIBILITY TO LESS THAN A QUARTER MILE. ********************************************************************* HAZARDOUS WEATHER REFERS TO ANY OF THE FOLLOWING... 1) LOCALLY HEAVY RAINFALL RESULTING IN FLASH FLOODING OR FLOODING 2) SAND OR DUST STORM REDUCING VISIBILITY TO 1/4 MILE OR LESS 3) DAMAGING WINDS IN EXCESS OF 57 MPH 4) HAIL 3/4 INCH OR LARGER IN DIAMETER CHECK THE PHOENIX STATE FORECAST DISCUSSION FOR MORE INFORMATION.
The office that day
Everything else NWS Phoenix, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 17, 6:01 PM MST | Severe Thunderstorm Warning | PSR | Maricopa | 69 min |
| Jul 17, 9:15 PM MST | Severe Thunderstorm Warning | PSR | Gila, Maricopa | 80 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.