Alert archive / New Jersey / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 15, NWS Philadelphia/Mount Holly

April 9, 1998Burlington County, Camden County, New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Apr 9, 1998, 5:19 PM EDT for Burlington County, Camden County, New Jersey. It was in force for 11 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: Apr 9, 1998, 5:19 PM EDT (21:19 UTC)
Expired: Apr 9, 1998, 5:30 PM EDT
In force: 11 min
Issued by: NWS Philadelphia/Mount Holly
Area: Whole counties

Counties Burlington County, NJ, Camden County, NJ

The radar

The Philadelphia radar (KDIX), 36 km from the middle of the area, began a volume at 21:23 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
Apr 9, 5:27 PM EDT	Thunderstorm Wind	Mt Laurel, NJ

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, 9.3 hours before the alert went out and 118 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 997 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 134 m²/s²
0-3 km storm-relative helicity: 219 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.

465 
WUUS1 KPHL 092120 RRA
SVRPHL
NJC005-007-092130-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
519 PM EDT THU APR 9 1998

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 530 PM EDT FOR PEOPLE
IN THE FOLLOWING LOCATION...

IN NEW JERSEY

   ...CAMDEN COUNTY
   ...BURLINGTON COUNTY

AT 513 PM EDT... RADAR AND SPOTTER REPORTS SHOWED A SEVERE
THUNDERSTORM IN THE VICINITY OF ATCO OR IN THE VICINITY OF BERLIN
MOVING NORTH NORTHEAST AT 50 MPH. A SPOTTER REPORTED HAIL RANGING
FROM PEA TO GOLFBALL SIZE WITH THIS STORM.

THIS THUNDERSTORM WILL AFFECT AREAS FROM GIBBSBORO AND MEDFORD TO
MT HOLLY.

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

AMC/MPD

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 9, 4:59 PM EDT	Severe Thunderstorm Warning	PHI	Cape May, Cumberland	21 min
Apr 9, 5:25 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Camden	35 min

Nearby

Severe Thunderstorm Warnings in New Jersey, 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; radar from the NEXRAD Level II archive.