Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 132, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 18, 1998, 3:58 PM EDT for Montgomery County, Philadelphia County, Pennsylvania. It was in force for 47 min. 2 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
- Aug 18, 1998, 3:58 PM EDT (19:58 UTC)
- Expired
- Aug 18, 1998, 4:45 PM EDT
- In force
- 47 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Whole counties
Counties Montgomery County, PA, Philadelphia County, PA
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Aug 18, 4:00 PM EDT | Thunderstorm Wind 50 | East Norriton, PA | |
| Aug 18, 4:30 PM EDT | Thunderstorm Wind 50 | Bustleton, 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
Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 8.0 hours before the alert went out and 102 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
- 148 J/kg
- Mixed-layer CIN
- -86 J/kg
- Mixed-layer LCL
- 1092 m above ground
- 0-6 km bulk shear
- 28 kt
- 0-1 km storm-relative helicity
- 3 m²/s²
- 0-3 km storm-relative helicity
- 16 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 181958 RRA SVRPHL PAC091-101-182045- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 358 PM EDT TUE AUG 18 1998 THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... SOUTHERN MONTGOMERY COUNTY IN PENNSYLVANIA PHILADELPHIA COUNTY IN PENNSYLVANIA * UNTIL 445 PM EDT * AT 356 PM EDT... A SEVERE THUNDERSTORM WAS INDICATED IN THE VICINITY OF BRIDGEPORT... BY NATIONAL WEATHER SERVICE DOPPLER RADAR... MOVING EAST NORTHEAST 25 MPH. * THE SEVERE THUNDERSTORM IS EXPECTED TO BE NEAR... FLOURTOWN AT 410 PM EDT AMBLER AT 410 PM EDT FORT WASHINGTON AT 410 PM EDT JENKINTOWN AT 420 PM EDT THIS IS A DANGEROUS STORM. MOVE INSIDE A STRONG BUILDING AND DO NOT STAND NEAR WINDOWS. FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME OR BUSINESS. DO NOT DRIVE YOUR CAR WHERE WATER COVERS THE ROADWAY. THE WATER MAY BE DEEPER THAN YOU THINK. IF CAUGHT IN RISING FLOOD WATERS... ABANDON YOUR CAR QUICKLY AND MOVE TO HIGHER GROUND. FLOODED ROADWAYS ARE LIKELY IN LOW LYING AREAS WITH THESE STORMS. FOR THE LATEST STORM INFORMATION...PLEASE TUNE TO NOAA WEATHER RADIO...YOUR LOCAL RADIO OR TELEVISION STATIONS...OR YOUR CABLE TELEVISION OUTLET. TFG/JAE
The office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 18, 1:55 PM EDT | Severe Thunderstorm Warning | PHI | Berks | 45 min |
Nearby
Severe Thunderstorm Warnings in Pennsylvania, 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.