Alert archive / Delaware / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 66, NWS Philadelphia/Mount Holly

June 2, 1998New Castle County, Delaware; Cecil County, Maryland

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jun 2, 1998, 8:49 PM EDT for New Castle County, Delaware; Cecil County, Maryland. It was in force for 41 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 2, 1998, 8:49 PM EDT (00:49 UTC)
Expired: Jun 2, 1998, 9:30 PM EDT
In force: 41 min
Issued by: NWS Philadelphia/Mount Holly
Area: Whole counties

Counties New Castle County, DE, Cecil County, MD

The radar

The Dover AFB radar (KDOX), 88 km from the middle of the area, began a volume at 00:52 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
Jun 2, 8:55 PM EDT	Thunderstorm Wind 50	Hockessin, DE

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
Jun 2, 6:45 PM EDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 00:00Z, 0.8 hours before the alert went out and 155 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: 1513 J/kg
Mixed-layer CIN: -23 J/kg
Mixed-layer LCL: 1158 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 229 m²/s²
0-3 km storm-relative helicity: 416 m²/s²
Significant tornado parameter: 2.2
Supercell composite: 11.8

Open this sounding in Storm Lab

The text

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

263 
WUUS1 KPHL 030052 RRA
SVRPHL
DEC003-MDC015-030040-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
849 PM EDT TUE JUN 2 1998

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHERN NEW CASTLE COUNTY IN DELAWARE
  EASTERN CECIL COUNTY IN MARYLAND

* UNTIL 930 PM EDT

* AT 849 PM EDT... NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  A SEVERE THUNDERSTORM 1 MILE WEST SOUTHWEST OF NEWARK MOVING EAST
  AT 35 MPH.

* THE SEVERE THUNDERSTORM IS EXPECTED TO BE NEAR...
  NEWPORT AT 852 PM EDT
  DELAWARE CITY AT 853 PM EDT
  WILMINGTON AIRPORT AT 853 PM EDT
  NEW CASTLE AT 856 PM EDT
  WILMINGTON AT 859 PM EDT
  BELLEFONTE AT 902 PM EDT
  ARDEN  AT 904 PM 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.

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.

GIGI/IOVINO

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 2, 8:01 PM EDT	Severe Thunderstorm Warning	PHI	Kent	49 min
Jun 2, 8:34 PM EDT	Severe Thunderstorm Warning	PHI	Queen Anne's	36 min
Jun 2, 8:59 PM EDT	Severe Thunderstorm Warning	PHI	Talbot	46 min
Jun 2, 9:05 PM EDT	Severe Thunderstorm Warning	PHI	Caroline	35 min

Nearby

Severe Thunderstorm Warnings in Delaware, 1998 Severe Thunderstorm Warnings in Maryland, 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.