Alert archive / Pennsylvania / Tornado Warnings in 2000

Tornado Warning 6, NWS Philadelphia/Mount Holly

June 18, 2000Delaware County, Philadelphia County, Pennsylvania

NWS Philadelphia/Mount Holly issued this tornado warning at Jun 18, 2000, 4:15 PM EDT for Delaware County, Philadelphia County, Pennsylvania. It was in force for 30 min. 2 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
Jun 18, 2000, 4:15 PM EDT (20:15 UTC)
Expired
Jun 18, 2000, 4:45 PM EDT
In force
30 min
Issued by
NWS Philadelphia/Mount Holly
Area
Whole counties

Counties Delaware County, PA, Philadelphia County, PA

What was reported inside it

TimeReportWhereRemark
Jun 18, 4:25 PM EDTHail 0.75Sharon Hill, PA
Jun 18, 4:30 PM EDTThunderstorm Wind 50 EPhiladelphia, 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.

IssuedProductOfficeLasted
Jun 18, 2:30 PM EDTSevere Thunderstorm WatchSPC7 hr

The nearest sounding before it

Wallops Is Stn, VA (KWAL), launched 12:00Z, 8.3 hours before the alert went out and 226 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, Wallops Is Stn, VA at 12:00Z on 2000-06-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2265 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Wallops Is Stn, VA at 12:00Z on 2000-06-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 73 square meters per square second.1939Sfc1 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
2265 J/kg
Mixed-layer CIN
-20 J/kg
Mixed-layer LCL
584 m above ground
0-6 km bulk shear
22 kt
0-1 km storm-relative helicity
73 m²/s²
0-3 km storm-relative helicity
59 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.

034 
WFUS51 KPHI 182015
TORPHL
PAC045-101-182045-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
415 PM EDT SUN JUN 18 2000

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* TORNADO WARNING FOR...
  EASTERN DELAWARE COUNTY IN SOUTHEAST PENNSYLVANIA
  SOUTHERN PHILADELPHIA COUNTY IN SOUTHEAST PENNSYLVANIA

* UNTIL 445 PM EDT.

* AT 410 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM WITH STRONG ROTATION 2 MILES SOUTH OF
  BROOMALL...MOVING EAST AT 25 MPH. THIS STORM COULD PRODUCE A
  TORNADO AT ANY TIME.

* THE TORNADO IS EXPECTED TO BE NEAR...
  EAST LANSDOWNE...YEADON AT 420 PM...
  PHILADELPHIA AT 435 PM...

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

$$
MPD
LAT...LON 4000 7537 3986 7537 3993 7521 4004 7502

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 18, 3:51 PM EDTTornado WarningPHIDelaware29 min

Nearby

Tornado Warnings in Pennsylvania, 2000Every tornado warning in 2000Tornadoes in 2000

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.