Alert archive / Arizona / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 77, NWS Phoenix, AZ
NWS Phoenix, AZ issued this severe thunderstorm warning at Aug 28, 1998, 6:04 PM MST for Maricopa County, Pinal County, Arizona. It was in force for 86 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 28, 1998, 6:04 PM MST (01:04 UTC)
- Expired
- Aug 28, 1998, 7:30 PM MST
- In force
- 86 min
- Issued by
- NWS Phoenix, AZ
- Area
- Whole counties
Counties Maricopa County, AZ, Pinal County, AZ
The radar
The Phoenix radar (KIWA), 29 km from the middle of the area, began a volume at 01:08 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 28, 6:09 PM MST | Thunderstorm Wind 52 | Scottsdale, AZ | Large area in the East Valley hit with high winds; 7 large trees knocked down in East Mesa and several power poles downed in Gilbert. Phoenix Sky Harbor Airport(PHX) recorded a peak gust of 53 mph at 1811 MST. |
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, 1.1 hours before the alert went out and 143 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
- 103 J/kg
- Mixed-layer CIN
- -247 J/kg
- Mixed-layer LCL
- 2954 m above ground
- 0-6 km bulk shear
- 19 kt
- 0-1 km storm-relative helicity
- 17 m²/s²
- 0-3 km storm-relative helicity
- 24 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.0
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, Aug 28, 2:39 PM MST, 3 hours 25 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE PHOENIX AZ 245 PM MST SAT AUG 15 1998 AZZ023-024-028-291200- EASTERN MARICOPA-SOUTHERN GILA-NORTHWEST PINAL ...A MODERATE RISK OF HAZARDOUS WEATHER WILL EXIST LATER THIS AFTERNOON AND THROUGH THE EVENING HOURS FOR EASTERN MARICOPA... SOUTHERN GILA...AND NORTHWEST PINAL COUNTIES... THUNDERSTORMS DEVELOPED OVER THE WHITE MOUNTAINS DURING THE LATE MORNING AND EARLY AFTERNOON HOURS...AND HAVE STARTED TO MOVE SOUTHWEST TOWARD THE DESERT AREAS. STRONG GUSTY WINDS HAVE BEEN REPORTED WITH THE STORMS...AND HAIL COVERED THE GROUND EARLIER IN THE AFTERNOON AT FORT APACHE. ALTHOUGH LOCAL HEAVY RAINS MAY TAKE PLACE THE MAIN THREAT WILL BE STRONG GUSTY WINDS...POSSIBLY TO OVER 50 MPH IN LOCAL GUSTS. ********************************************************************* 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. JP
Special weather statement, Aug 28, 2:45 PM MST, 3 hours 19 minutes before
HAZARDOUS WEATHER OUTLOOK...CORRECTED NATIONAL WEATHER SERVICE PHOENIX AZ 245 PM MST FRI AUG 28 1998 AZZ023-024-028-291200- EASTERN MARICOPA-SOUTHERN GILA-NORTHWEST PINAL ...A MODERATE RISK OF HAZARDOUS WEATHER WILL EXIST LATER THIS AFTERNOON AND THROUGH THE EVENING HOURS FOR EASTERN MARICOPA... SOUTHERN GILA...AND NORTHWEST PINAL COUNTIES... THUNDERSTORMS DEVELOPED OVER THE WHITE MOUNTAINS DURING THE LATE MORNING AND EARLY AFTERNOON HOURS...AND HAVE STARTED TO MOVE SOUTHWEST TOWARD THE DESERT AREAS. STRONG GUSTY WINDS HAVE BEEN REPORTED WITH THE STORMS...AND HAIL COVERED THE GROUND EARLIER IN THE AFTERNOON AT FORT APACHE. ALTHOUGH LOCAL HEAVY RAINS MAY TAKE PLACE THE MAIN THREAT WILL BE STRONG GUSTY WINDS...POSSIBLY TO OVER 50 MPH IN LOCAL GUSTS. ********************************************************************* 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. JP
Special weather statement, Aug 28, 2:45 PM MST, 3 hours 19 minutes before
HAZARDOUS WEATHER OUTLOOK...CORRECTED NATIONAL WEATHER SERVICE PHOENIX AZ 245 PM MST FRI AUG 28 1998 AZZ023-024-028-291200- EASTERN MARICOPA-SOUTHERN GILA-NORTHWEST PINAL ...A MODERATE RISK OF HAZARDOUS WEATHER WILL EXIST LATER THIS AFTERNOON AND THROUGH THE EVENING HOURS FOR EASTERN MARICOPA... SOUTHERN GILA...AND NORTHWEST PINAL COUNTIES... THUNDERSTORMS DEVELOPED OVER THE WHITE MOUNTAINS DURING THE LATE MORNING AND EARLY AFTERNOON HOURS...AND HAVE STARTED TO MOVE SOUTHWEST TOWARD THE DESERT AREAS. STRONG GUSTY WINDS HAVE BEEN REPORTED WITH THE STORMS...AND HAIL COVERED THE GROUND EARLIER IN THE AFTERNOON AT FORT APACHE. ALTHOUGH LOCAL HEAVY RAINS MAY TAKE PLACE THE MAIN THREAT WILL BE STRONG GUSTY WINDS...POSSIBLY TO OVER 50 MPH IN LOCAL GUSTS. ********************************************************************* 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. JP
The office that day
Everything else NWS Phoenix, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 28, 5:39 PM MST | Severe Thunderstorm Warning | PSR | Maricopa, Pinal | 31 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.