Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 131, NWS Philadelphia/Mount Holly

June 27, 2002Carbon County, Lehigh County, Northampton County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jun 27, 2002, 6:30 PM EDT for Carbon County, Lehigh County, Northampton County, Pennsylvania. It was in force for 60 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 27, 2002, 6:30 PM EDT (22:30 UTC)
Expired: Jun 27, 2002, 7:30 PM EDT
In force: 60 min
Issued by: NWS Philadelphia/Mount Holly
Area: Whole counties

Counties Carbon County, PA, Lehigh County, PA, Northampton County, PA

The radar

The Philadelphia radar (KDIX), 132 km from the middle of the area, began a volume at 22:30 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 27, 6:50 PM EDT	Thunderstorm Wind 50 E	Nazareth, 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
Jun 27, 2:00 PM EDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 10.5 hours before the alert went out and 151 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: 287 J/kg
Mixed-layer CIN: -83 J/kg
Mixed-layer LCL: 1213 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 12 m²/s²
0-3 km storm-relative helicity: 76 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

Open this sounding in Storm Lab

The text

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

000 
WUUS51 KPHI 272230
SVRPHI
PAC025-077-095-272330-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
624 PM EDT THU JUN 27 2002

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  LEHIGH COUNTY IN EASTERN PENNSYLVANIA.
  NORTHAMPTON COUNTY IN EASTERN PENNSYLVANIA.
  SOUTHERN CARBON COUNTY IN NORTHEAST PENNSYLVANIA.

* UNTIL 730 PM EDT.

* AT 620 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED 
  SEVERE THUNDERSTORMS...ALONG A LINE EXTENDING FROM 8 MILES NORTH OF
  LEHIGHTON TO 8 MILES SOUTH OF LEHIGHTON TO 19 MILES WEST OF ANCIENT
  OAKS...MOVING EAST AT 20 MPH.

* SEVERE THUNDERSTORMS WILL BE NEAR...
  PALMERTON AT 640 PM.
  SCHNECKSVILLE AT 645 PM.
  NORTHAMPTON AT 700 PM.
  ANCIENT OAKS AT 705 PM.
  BATH AT 710 PM.
  ALLENTOWN AT 715 PM.

HAIL UP TO ONE INCH IN DIAMETER AND WINDS GREATER THAN 55 MILES AN
HOUR ARE EXPECTED FROM THIS STORM. SEEK SHELTER IN A STURDY STRUCTURE
UNTIL THE STORM HAS PASSED.

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

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 800 PM THURSDAY
EVENING FOR NORTHWESTERN NEW JERSEY AND EASTERN PENNSYLVANIA.

$$

LAT...LON 4082 7539 4078 7551 4090 7558 4081 7580
          4072 7573 4068 7582 4056 7566 4047 7552
          4062 7523

KRUZDLO

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 27, 4:05 PM EDT	Severe Thunderstorm Warning	PHI	Lehigh, Northampton	25 min
Jun 27, 4:33 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Northampton	37 min
Jun 27, 5:36 PM EDT	Severe Thunderstorm Warning	PHI	Berks	39 min
Jun 27, 6:05 PM EDT	Tornado Warning	PHI	Berks	55 min
Jun 27, 6:55 PM EDT	Flash Flood Warning	PHI	Berks	3 hr
Jun 27, 7:13 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Bucks, Chester, Montgomery	47 min
Jun 27, 7:59 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Philadelphia	31 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2002 Every severe thunderstorm warning in 2002

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.