Alert archive / Arizona / Severe Thunderstorm Warnings in 1997
Severe Thunderstorm Warning 99, NWS Phoenix, AZ
NWS Phoenix, AZ issued this severe thunderstorm warning at Sep 11, 1997, 10:43 AM MST for Maricopa County, Arizona. It was in force for 62 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
- Sep 11, 1997, 10:43 AM MST (17:43 UTC)
- Expired
- Sep 11, 1997, 11:45 AM MST
- In force
- 62 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 17:47 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 |
|---|---|---|---|
| Sep 11, 10:47 AM MST | Thunderstorm Wind 50 | Phoenix, AZ | Spotters reported trellises and shingles damaged in North Phoenix. |
| Sep 11, 11:00 AM MST | Thunderstorm Wind 52 | Phoenix, AZ | NWS employee estimated wind gusts to 60 mph. |
| Sep 11, 11:02 AM MST | Thunderstorm Wind 80 | Phoenix, AZ | Deer Valley airport reported a peak gust of 92mph. |
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 12:00Z, 5.7 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
- 163 J/kg
- Mixed-layer CIN
- -200 J/kg
- Mixed-layer LCL
- 2343 m above ground
- 0-6 km bulk shear
- 14 kt
- 0-1 km storm-relative helicity
- -6 m²/s²
- 0-3 km storm-relative helicity
- 59 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KPHX 111743 RRA SVRPHX AZC013-111845- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE PHOENIX AZ 1043 AM MST THU SEP 11 1997 * SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN AND NORTH CENTRAL MARICOPA COUNTY IN CENTRAL ARIZONA * UNTIL 1145 AM MST * SOME LOCATIONS AFFECTED WICKENBURG MORRISTOWN NEW RIVER LAKE PLEASANT SURPRISE NORTH PHOENIX * AT 1042 AM MST RADAR INDICATED SEVERE THUNDERSTORMSZ FROM WICKENBURG TO NEAR SURPRISE AND NORTH OF SUN CITY. MOVEMENT WAS TO THE NORTHEAST AT 20 MPH. STRONG DAMAGING WINDS ARE LIKELY WITH THESE STORMS.
The office that day
Everything else NWS Phoenix, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 11, 10:25 AM MST | Severe Thunderstorm Warning | PSR | Maricopa | 45 min |
| Sep 11, 11:48 AM MST | Severe Thunderstorm Warning | PSR | Maricopa, Pinal | 62 min |
| Sep 11, 12:50 PM MST | Flash Flood Warning | PSR | Maricopa, Pinal | 2 hr |
| Sep 11, 12:50 PM MST | Severe Thunderstorm Warning | PSR | Maricopa, Pinal | 2 hr |
| Sep 11, 1:13 PM MST | Severe Thunderstorm Warning | PSR | Maricopa | 57 min |
Nearby
Severe Thunderstorm Warnings in Arizona, 1997Every severe thunderstorm warning in 1997
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.