Alert archive / New Jersey / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 69, NWS Philadelphia/Mount Holly

July 9, 1997Mercer County, New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 9, 1997, 6:37 PM EDT for Mercer County, New Jersey. It was in force for 63 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: Jul 9, 1997, 6:37 PM EDT (22:37 UTC)
Expired: Jul 9, 1997, 7:40 PM EDT
In force: 63 min
Issued by: NWS Philadelphia/Mount Holly
Area: Whole counties

County Mercer County, NJ

The radar

The Philadelphia radar (KDIX), 45 km from the middle of the area, began a volume at 22:39 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
Jul 9, 6:40 PM EDT	Thunderstorm Wind 50	Hopewell, NJ
Jul 9, 6:45 PM EDT	Hail 0.75	Lawrenceville, NJ
Jul 9, 6:45 PM EDT	Thunderstorm Wind	Trenton, 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 watch it was issued in

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

Issued	Product	Office	Lasted
Jul 9, 1:15 PM EDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 10.6 hours before the alert went out and 150 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: 189 J/kg
Mixed-layer CIN: -118 J/kg
Mixed-layer LCL: 1364 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 36 m²/s²
0-3 km storm-relative helicity: 25 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 092237 RRA
SVRPHL
NJC021-092340-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE PHILADELPHIA/MOUNT HOLLY NJ
637 PM EDT WED JUL 9 1997

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 740 PM EDT FOR PEOPLE IN
THE FOLLOWING LOCATION...

IN  NEW JERSEY

   ...MERCER COUNTY
 
AT 636 PM EDT...A SEVERE THUNDERSTORM WAS INDICATED BY NWS DOPPLER
RADAR 3 MILES SOUTH SOUTHWEST OF WASHINGTON CROSSING MOVING EAST
NORTHEAST AT 35 MPH.

THIS STORM MAY AFFECT THE FOLLOWING NEARBY AREAS... WASHINGTON
CROSSING... WEST TRENTON... TITUSVILLE... EWING TOWNSHIP...
HARBOURTON... PENNINGTON... LAWRENCEVILLE... HOPEWELL... PRINCETON AND
PRINCETON JUNCTION.

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.

FRANKLIN/STAUBER

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 9, 4:01 PM EDT	Severe Thunderstorm Warning	PHI	Sussex	64 min
Jul 9, 5:04 PM EDT	Severe Thunderstorm Warning	PHI	Sussex, Warren	61 min
Jul 9, 5:17 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon	63 min
Jul 9, 5:33 PM EDT	Severe Thunderstorm Warning	PHI	Morris	62 min

Nearby

Severe Thunderstorm Warnings in New Jersey, 1997 Every 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.