Alert archive / Arizona / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 69, NWS Phoenix, AZ
NWS Phoenix, AZ issued this severe thunderstorm warning at Aug 15, 1998, 6:56 PM MST for Pinal County, Arizona. It was in force for 49 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, 6:56 PM MST (01:56 UTC)
- Expired
- Aug 15, 1998, 7:45 PM MST
- In force
- 49 min
- Issued by
- NWS Phoenix, AZ
- Area
- Whole counties
County Pinal County, AZ
The radar
The Phoenix radar (KIWA), 52 km from the middle of the area, began a volume at 01:59 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, 7:15 PM MST | Thunderstorm Wind 55 | Coolidge, AZ | Several palo verde trees blown down. Some homes and businesses in Coolidge received minor damage due to the winds. One resident reported a stored row boat that blew about a quarter mile. Washes near Casa Grande, southwest of Coolidge, were reported running ab |
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, 1.9 hours before the alert went out and 92 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.
088 WUUS1 KPHX 160158 RRA SVRPHX AZC021-160245- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE PHOENIX AZ 656 PM MST SAT AUG 15 1998 THE NATIONAL WEATHER SERVICE IN PHOENIX HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN AND NORTH CENTRAL PINAL COUNTY IN CENTRAL ARIZONA * UNTIL 745 PM MST * AT 650 MST DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 5 MIKLES NORTHWEST COOLIDGE. MOVEMENT WAS TO THE SOUTH SOUTHEAST AT 10 MPH. * SOME LOCATIONS AFFECTED INCLUDE COOLIDGE OLBERG SACATON STRONG DAMAGING WINDS ARE LIKELY WITH THIS STORM.
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 15, 1:30 PM MST, 5 hours 26 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE PHOENIX AZ 130 PM MST SAT AUG 15 1998 AZZ020>028-161200- MARICOPA-SOUTHERN GILA-NORTHWEST PINAL-LA PAZ-YUMA ...A MODERATE RISK OF HAZARDOUS WEATHER WILL EXIST LATER THIS AFTERNOON AND THROUGH THE EVENING HOURS FOR MARICOPA...SOUTHERN GILA...NORTHWEST PINAL...LA PAZ...AND YUMA COUNTIES... THUNDERSTORMS HAVE STARTED TO DEVELOP OVER SOUTHWEST ARIZONA...AND WILL CONTINUE TO DEVELOP THROUGH THE AFTERNOON AND EVENING HOURS. IN ADDITION THUNDERSTORMS ALONG THE CENTRAL MOUNTAINS ARE EXPECTED TO MOVE SOUTHWEST INTO THE LOWER DESERT AREAS LATE IN THE DAY. THE ATMOSPHERE IS WET AND VERY UNSTABLE...A GOOD ENVIRONMENT FOR PRODUCING THUNDERSTORMS ASSOCIATED WITH STRONG DAMAGING WINDS AND HEAVY RAIN. ********************************************************************* 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 15, 1:30 PM MST, 5 hours 26 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE PHOENIX AZ 130 PM MST SAT AUG 15 1998 AZZ020>028-161200- MARICOPA-SOUTHERN GILA-NORTHWEST PINAL-LA PAZ-YUMA ...A MODERATE RISK OF HAZARDOUS WEATHER WILL EXIST LATER THIS AFTERNOON AND THROUGH THE EVENING HOURS FOR MARICOPA...SOUTHERN GILA...NORTHWEST PINAL...LA PAZ...AND YUMA COUNTIES... THUNDERSTORMS HAVE STARTED TO DEVELOP OVER SOUTHWEST ARIZONA...AND WILL CONTINUE TO DEVELOP THROUGH THE AFTERNOON AND EVENING HOURS. IN ADDITION THUNDERSTORMS ALONG THE CENTRAL MOUNTAINS ARE EXPECTED TO MOVE SOUTHWEST INTO THE LOWER DESERT AREAS LATE IN THE DAY. THE ATMOSPHERE IS WET AND VERY UNSTABLE...A GOOD ENVIRONMENT FOR PRODUCING THUNDERSTORMS ASSOCIATED WITH STRONG DAMAGING WINDS AND HEAVY RAIN. ********************************************************************* 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 15, 5:19 PM MST | Severe Thunderstorm Warning | PSR | Gila | 61 min |
| Aug 15, 7:29 PM MST | Severe Thunderstorm Warning | PSR | Maricopa | 66 min |
| Aug 15, 7:48 PM MST | Severe Thunderstorm Warning | PSR | Maricopa | 62 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.