Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 1997
Severe Thunderstorm Warning 1, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Feb 22, 1997, 12:31 PM EST for 4 counties in Pennsylvania. It was in force for 64 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
- Feb 22, 1997, 12:31 PM EST (17:31 UTC)
- Expired
- Feb 22, 1997, 1:35 PM EST
- In force
- 64 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Whole counties
Counties Bucks County, PA, Delaware County, PA, Montgomery County, PA, Philadelphia County, PA
The radar
The Philadelphia radar (KDIX), 74 km from the middle of the area, began a volume at 17:35 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 |
|---|---|---|---|
| Feb 22, 12:40 PM EST | Thunderstorm Wind 52 | Buckingham Vly, PA | |
| Feb 22, 12:40 PM EST | Thunderstorm Wind | Wawa, PA | |
| Feb 22, 12:45 PM EST | Thunderstorm Wind | Countywide, PA |
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
Washington/Dulle, VA (KIAD), launched 12:00Z, 5.5 hours before the alert went out and 225 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 912 m above ground
- 0-6 km bulk shear
- 77 kt
- 0-1 km storm-relative helicity
- 170 m²/s²
- 0-3 km storm-relative helicity
- 194 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 KPHL 221734 RRA SVRPHL PAC017-045-091-101-221835- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE PHILADELPHIA/MOUNT HOLLY NJ 1231 PM EST SAT FEB 22 1997 THE NATIONAL WEATHER SERVICE IN PHILADELPHIA/MOUNT HOLLY NJ HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 135 PM EST FOR PEOPLE IN THE FOLLOWING LOCATION... IN PENNSYLVANIA ...SOUTHEASTERN BUCKS COUNTY ...SOUTHEASTERN MONTGOMERY ...DELAWARE COUNTY ...PHILADELPHIA COUNTY A LINE OF THUNDERSTORMS WITH DAMAGING WIND GUSTS EXTENDED FROM NEAR THE WILLOW GROVE N.A.S. SOUTHWEST TO THE CHESTER COUNTY/DELAWARE COUNTY LINE. THIS LINE TOOK DOWN TREES IN COATESVILLE AND COLLEGEVILLE. IF YOU ARE IN THE PATH OF THIS STORM...SEEK SHELTER NOW. AFTER THE STORM HAS PASSED...REPORT ANY SEVERE WEATHER OR FLOODING TO YOUR LOCAL LAW ENFORCEMENT AGENCY AND HAVE THEM RELAY YOUR SEVERE WEATHER REPORT ON TO THE NATIONAL WEATHER SERVICE. SEVERE THUNDERSTORMS CONTAIN WINDS GREATER THAN 58 MILES AN HOUR... DIME SIZE HAIL OR LARGER...VERY HEAVY RAINS AND DEADLY LIGHTNING. STAY TUNED TO NOAA WEATHER RADIO...THE VOICE OF THE NATIONAL WEATHER SERVICE...OR TO COMMERCIAL RADIO OR TELEVISION STATIONS FOR THE LATEST STORM INFORMATION. &
Nearby
Severe Thunderstorm Warnings in Pennsylvania, 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.