Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 92, NWS Philadelphia/Mount Holly

June 26, 1998Bucks County, Montgomery County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jun 26, 1998, 11:58 AM EDT for Bucks County, Montgomery County, Pennsylvania. It was in force for 47 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Jun 26, 1998, 11:58 AM EDT (15:58 UTC)
Expired
Jun 26, 1998, 12:45 PM EDT
In force
47 min
Issued by
NWS Philadelphia/Mount Holly
Area
Whole counties

Counties Bucks County, PA, Montgomery County, PA

The nearest sounding before it

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 4.0 hours before the alert went out and 116 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.

Skew-T log-pSkew-T log-p diagram, Phillips Aaf/Abe, MD at 12:00Z on 1998-06-26Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 507 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Phillips Aaf/Abe, MD at 12:00Z on 1998-06-26The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 119 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
507 J/kg
Mixed-layer CIN
-148 J/kg
Mixed-layer LCL
1558 m above ground
0-6 km bulk shear
24 kt
0-1 km storm-relative helicity
119 m²/s²
0-3 km storm-relative helicity
105 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.8

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
TTAA00 KPHL 261558 RRA
SVRPHL
PAC017-091-261645-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1158 AM EDT FRI JUN 26 1998

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHERN MONTGOMERY COUNTY IN PENNSYLVANIA
  NORTHERN BUCKS COUNTY IN PENNSYLVANIA

* UNTIL 1245 PM EDT

* AT 1156 AM EDT... A DEVELOPING SEVERE THUNDERSTORM WAS INDICATED
  NEAR EAST GREENVILLE... BY NATIONAL WEATHER
  SERVICE DOPPLER RADAR... MOVING SOUTHEAST 30 MPH.

* THE SEVERE THUNDERSTORM IS EXPECTED TO BE NEAR...
  TELFORD AT NOON EDT
  PERKASIE AT NOON EDT
  SOUDERTON AT 1205 PM EDT
  SILVERDALE AT 1205 PM EDT
  DUBLIN AT 1210 PM EDT
  HATFIELD AT 1210 PM EDT
  LANSDALE AT 1210 PM EDT
  NEW BRITAIN AT 1215 PM EDT
  CHALFONT AT 1215 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.

FOR THE LA*TEST STORM INFORMATION...PLEASE TUNE TO NOAA WEATHER
RADIO...YOUR LOCAL RADIO OR TELEVISION STATIONS...OR YOUR CABLE
TELEVISION OUTLET.

TFG

The office that day

Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 26, 12:12 PM EDTSevere Thunderstorm WarningPHIBerks33 min
Jun 26, 12:32 PM EDTSevere Thunderstorm WarningPHIBerks63 min
Jun 26, 1:36 PM EDTSevere Thunderstorm WarningPHIBerks64 min
Jun 26, 2:05 PM EDTSevere Thunderstorm WarningPHIChester, Montgomery65 min
Jun 26, 2:30 PM EDTSevere Thunderstorm WarningPHIPhiladelphia65 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; the sounding from the Mesonet's radiosonde archive.