Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 48, NWS Philadelphia/Mount Holly

June 1, 1998Bucks County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jun 1, 1998, 12:54 AM EDT for Bucks County, Pennsylvania. It was in force for 31 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: Jun 1, 1998, 12:54 AM EDT (04:54 UTC)
Expired: Jun 1, 1998, 1:25 AM EDT
In force: 31 min
Issued by: NWS Philadelphia/Mount Holly
Area: Whole counties

County Bucks County, PA

What was reported inside it

Time	Report	Where	Remark
Jun 1, 1:10 AM EDT	Thunderstorm Wind 50	New Hope, 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
May 31, 10:00 PM EDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Brookhaven, NY (KOKX), launched 00:00Z, 4.9 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 151 J/kg
Mixed-layer CIN: -348 J/kg
Mixed-layer LCL: 1224 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 233 m²/s²
0-3 km storm-relative helicity: 319 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.0

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KPHL 010455
SVRPHL
PAC017-010525-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1254 AM EDT MON JUN 1 1998

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

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

* UNTIL 125 AM EDT

* AT 1252 AM EDT... NATIONAL WEATHER SERVICE DOPPLER RADAR
  INDICATED A SEVERE THUNDERSTORM IN THE VICINITY OF QUAKERTOWN
  MOVING EAST AT 40 MPH. PEA SIZE HAIL WAS REPORTED AT SELLERSVILLE.

* THE SEVERE THUNDERSTORM IS EXPECTED TO BE NEAR...
  POINT PLEASANT AT 101 AM EDT
  UHLERSTOWN AT 103 AM EDT
  NEW HOPE AT 109 AM EDT
  WASHINGTON CROSSING AT 114 AM EDT

A TORNADO WATCH REMAINS IN EFFECT FOR THE AREA. SEVERE
THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE TORNADOES WITH
LITTLE OR NO ADVANCE WARNING.

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.

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

KRAUS/DELISI

The office that day

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

Issued	Product	Office	Counties	Lasted
May 31, 8:11 PM EDT	Severe Thunderstorm Warning	PHI	Berks	64 min
May 31, 8:37 PM EDT	Tornado Warning	PHI	Berks	33 min
May 31, 9:07 PM EDT	Tornado Warning	PHI	Berks, Lehigh	48 min
May 31, 9:14 PM EDT	Severe Thunderstorm Warning	PHI	Berks	46 min
May 31, 9:39 PM EDT	Tornado Warning	PHI	Berks, Chester	36 min
May 31, 9:43 PM EDT	Tornado Warning	PHI	Bucks	32 min
May 31, 10:01 PM EDT	Tornado Warning	PHI	Monroe	34 min
May 31, 10:21 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Montgomery	49 min
May 31, 11:01 PM EDT	Severe Thunderstorm Warning	PHI	Northampton	34 min
Jun 1, 12:17 AM EDT	Severe Thunderstorm Warning	PHI	Berks	48 min
Jun 1, 12:40 AM EDT	Severe Thunderstorm Warning	PHI	Chester	50 min
Jun 1, 1:00 AM EDT	Severe Thunderstorm Warning	PHI	Delaware	50 min
Jun 1, 1:15 AM EDT	Severe Thunderstorm Warning	PHI	Philadelphia	35 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 1998 Every 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.