Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 156, NWS Philadelphia/Mount Holly

July 23, 2002Berks County, Lehigh County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 23, 2002, 4:04 PM EDT for Berks County, Lehigh County, Pennsylvania. It was in force for 56 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: Jul 23, 2002, 4:04 PM EDT (20:04 UTC)
Expired: Jul 23, 2002, 5:00 PM EDT
In force: 56 min
Issued by: NWS Philadelphia/Mount Holly
Area: Whole counties

Counties Berks County, PA, Lehigh County, PA

The radar

The Philadelphia radar (KDIX), 131 km from the middle of the area, began a volume at 20:03 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
Jul 23, 4:15 PM EDT	Thunderstorm Wind 50 E	Leesport, PA
Jul 23, 4:20 PM EDT	Thunderstorm Wind 52 E	Slatedale, 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
Jul 23, 12:15 PM EDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 8.1 hours before the alert went out and 120 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: 249 J/kg
Mixed-layer CIN: -185 J/kg
Mixed-layer LCL: 1419 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 130 m²/s²
0-3 km storm-relative helicity: 150 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 
WUUS51 KPHI 232004
SVRPHI
PAC011-077-232100-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
404 PM EDT TUE JUL 23 2002

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHERN BERKS COUNTY IN EASTERN PENNSYLVANIA.
  LEHIGH COUNTY IN EASTERN PENNSYLVANIA.

* UNTIL 500 PM EDT.

* AT 358 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM...4 MILES NORTHWEST OF HAMBURG...MOVING EAST
  AT 65 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  SCHNECKSVILLE AT 415 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 700 PM TUESDAY
EVENING FOR NORTHWESTERN NEW JERSEY AND EASTERN PENNSYLVANIA.

$$

LAT...LON 4051 7639 4034 7611 4062 7549 4077 7568
          4056 7601

KRUZDLO

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 23, 3:27 PM EDT	Flash Flood Warning	PHI	Carbon, Monroe	3 hr
Jul 23, 3:27 PM EDT	Severe Thunderstorm Warning	PHI	Monroe	33 min
Jul 23, 3:28 PM EDT	Flash Flood Warning	PHI	Carbon, Monroe	3 hr
Jul 23, 3:36 PM EDT	Severe Thunderstorm Warning	PHI	Carbon	54 min
Jul 23, 3:59 PM EDT	Severe Thunderstorm Warning	PHI	Monroe	61 min
Jul 23, 4:05 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Lehigh	55 min
Jul 23, 4:24 PM EDT	Severe Thunderstorm Warning	PHI	Northampton	66 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.