Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 149, NWS Philadelphia/Mount Holly

July 19, 2002Bucks County, Pennsylvania; Burlington County, New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 19, 2002, 4:50 PM EDT for Bucks County, Pennsylvania; Burlington County, New Jersey. It was in force for 40 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: Jul 19, 2002, 4:50 PM EDT (20:50 UTC)
Expired: Jul 19, 2002, 5:30 PM EDT
In force: 40 min
Issued by: NWS Philadelphia/Mount Holly
Area: Whole counties

Counties Burlington County, NJ, Bucks County, PA

The radar

The Philadelphia radar (KDIX), 44 km from the middle of the area, began a volume at 20:50 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
Jul 19, 4:52 PM EDT	Thunderstorm Wind 50 E	Hulmeville, PA
Jul 19, 5:10 PM EDT	Thunderstorm Wind 52 E	Cinnaminson, NJ
Jul 19, 5:32 PM EDT	Thunderstorm Wind 50 E	Moorestown, NJ

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 nearest sounding before it

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 8.8 hours before the alert went out and 126 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: 6 J/kg
Mixed-layer CIN: -238 J/kg
Mixed-layer LCL: 1440 m above ground
0-6 km bulk shear: 17 kt
0-1 km storm-relative helicity: -8 m²/s²
0-3 km storm-relative helicity: 11 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.1

Open this sounding in Storm Lab

The text

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

259 
WUUS51 KPHI 192050
SVRPHI
NJC005-PAC017-192130-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
450 PM EDT FRI JUL 19 2002

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EXTREME SOUTHEASTERN BUCKS COUNTY IN SOUTHEAST PENNSYLVANIA.
  NORTHWESTERN BURLINGTON COUNTY IN SOUTHERN NEW JERSEY.

* UNTIL 530 PM EDT.

* AT 445 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM... OVER BEVERLY...MOVING NORTHEAST AT 15 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  FLORENCE AT 455 PM.
  BORDENTOWN AT 505 PM.

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

INTENSE LIGHTNING IS OCCURRING WITH THIS STORM. MOVE INDOORS IF
POSSIBLE. WHEN INDOORS...STAY AWAY FROM WINDOWS AND DOORS AND AVOID
USING TELEPHONES UNLESS IT IS AN EMERGENCY. IF OUTDOORS...STAY AWAY
FROM ISOLATED HIGH OBJECTS SUCH AS TREES.

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

$$

LAT...LON 4001 7504 3997 7488 4011 7463 4015 7469
          4017 7478 4013 7484

EBERWINE

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 19, 6:24 PM EDT	Severe Thunderstorm Warning	PHI	Bucks	36 min
Jul 19, 1:51 PM EDT	Severe Thunderstorm Warning	PHI	Monmouth	24 min
Jul 19, 2:10 PM EDT	Special Marine Warning	PHI		65 min
Jul 19, 2:10 PM EDT	Special Marine Warning	PHI		65 min
Jul 19, 2:42 PM EDT	Severe Thunderstorm Warning	PHI	Monmouth, Ocean	48 min
Jul 19, 3:17 PM EDT	Special Marine Warning	PHI		88 min
Jul 19, 3:33 PM EDT	Severe Thunderstorm Warning	PHI	Ocean	42 min
Jul 19, 4:06 PM EDT	Tornado Warning	PHI	Ocean	39 min
Jul 19, 5:01 PM EDT	Special Marine Warning	PHI		59 min
Jul 19, 5:26 PM EDT	Severe Thunderstorm Warning	PHI	Burlington	49 min
Jul 19, 5:44 PM EDT	Flash Flood Warning	PHI	Monmouth, Ocean	3 hr
Jul 19, 7:12 PM EDT	Flash Flood Warning	PHI	Burlington, Camden	2 hr

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2002 Severe Thunderstorm Warnings in New Jersey, 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.