Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 3, NWS Philadelphia/Mount Holly

March 10, 2002Lehigh County, Monroe County, Northampton County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Mar 10, 2002, 12:05 AM EST for Lehigh County, Monroe County, Northampton County, Pennsylvania. It was in force for 55 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: Mar 10, 2002, 12:05 AM EST (05:05 UTC)
Expired: Mar 10, 2002, 1:00 AM EST
In force: 55 min
Issued by: NWS Philadelphia/Mount Holly
Area: Whole counties

Counties Lehigh County, PA, Monroe County, PA, Northampton County, PA

The radar

The Philadelphia radar (KDIX), 128 km from the middle of the area, began a volume at 05:06 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
Mar 10, 12:10 AM EST	Thunderstorm Wind 50 E	Countywide, PA
Mar 10, 12:20 AM EST	Thunderstorm Wind 50 E	Slatington, PA
Mar 10, 12:45 AM EST	Thunderstorm Wind 50 E	Glendon, 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
Mar 9, 8:30 PM EST	Severe Thunderstorm Watch	SPC	5 hr
Mar 9, 11:30 PM EST	Severe Thunderstorm Watch	SPC	4 hr

The nearest sounding before it

Brookhaven, NY (KOKX), launched 00:00Z, 5.1 hours before the alert went out and 214 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: 10 J/kg
Mixed-layer CIN: -21 J/kg
Mixed-layer LCL: 541 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 232 m²/s²
0-3 km storm-relative helicity: 336 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 100505
SVRPHI
PAC077-089-095-100600-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1203 AM EST SUN MAR 10 2002

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

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

* UNTIL 100 AM EST.

* AT 1201 AM EST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  SEVERE THUNDERSTORMS... ALONG A LINE EXTENDING FROM 13 MILES
  NORTHWEST OF POCONO PINES TO 24 MILES WEST OF ANCIENT OAKS...MOVING
  EAST AT 40 MPH.

* SEVERE THUNDERSTORMS WILL BE NEAR...
  POCONO PINES AT 1220 AM.
  SCHNECKSVILLE AT 1225 AM.
  MOUNT POCONO AT 1230 AM.
  NORTHAMPTON...MOUNTAINHOME...BRODHEADSVILLE...
     ANCIENT OAKS AT 1235 AM.
  ALLENTOWN AT 1240 AM.
  WIND GAP...EMMAUS AT 1245 AM.

DAMAGING WINDS IN EXCESS OF 55 MPH ARE EXPECTED FROM THIS STORM. SEEK
SHELTER IN A STURDY STRUCTURE UNTIL THE STORM HAS PASSED.

REPORT SEVERE WEATHER TO THE NEAREST LAW ENFORCEMENT AGENCY. THEY
WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST
OFFICE IN MOUNT HOLLY.

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 300 AM SUNDAY 
MORNING FOR EASTERN PENNSYLVANIA. 

$$

LAT...LON 4084 7551 4070 7590 4044 7550 4062 7521
          4098 7513 4109 7498 4126 7550 4113 7561
          4100 7549

AMC

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 9, 11:39 PM EST	Severe Thunderstorm Warning	PHI	Berks	51 min
Mar 9, 11:43 PM EST	Severe Thunderstorm Warning	PHI	Carbon	32 min
Mar 10, 2:12 AM EST	Severe Thunderstorm Warning	PHI	Bucks	18 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.