Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2003

Severe Thunderstorm Warning 35, NWS Philadelphia/Mount Holly

July 5, 2003Delaware County, Montgomery County, Philadelphia County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 5, 2003, 4:37 PM EDT for Delaware County, Montgomery County, Philadelphia County, Pennsylvania. It was in force for 38 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jul 5, 2003, 4:37 PM EDT (20:37 UTC)
Expired: Jul 5, 2003, 5:15 PM EDT
In force: 38 min
Issued by: NWS Philadelphia/Mount Holly
Area: Counties, with a storm outline in the text

Counties Delaware County, PA, Montgomery County, PA, Philadelphia County, PA

The radar

The Philadelphia radar (KDIX), 77 km from the middle of the area, began a volume at 20:40 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.

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 8.6 hours before the alert went out and 215 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: 351 J/kg
Mixed-layer CIN: -201 J/kg
Mixed-layer LCL: 1322 m above ground
0-6 km bulk shear: 6 kt
0-1 km storm-relative helicity: 69 m²/s²
0-3 km storm-relative helicity: 80 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.

029 
WUUS51 KPHI 052037
SVRPHI
PAC045-091-101-052115-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
436 PM EDT SAT JUL 5 2003

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHERN DELAWARE COUNTY IN SOUTHEAST PENNSYLVANIA.
  PHILADELPHIA COUNTY IN SOUTHEAST PENNSYLVANIA.
  SOUTHEASTERN MONTGOMERY COUNTY IN SOUTHEAST PENNSYLVANIA.

* UNTIL 515 PM EDT.

* AT 429 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM... 15 MILES WEST OF RADNOR TOWNSHIP...MOVING
  EAST AT 35 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  BRYN MAWR...RADNOR TOWNSHIP...BROOMALL...KING OF PRUSSIA AT 445 PM.
  DREXEL HILL...EAST LANSDOWNE...YEADON...PLYMOUTH MEETING AT 450 PM.
  PHILADELPHIA AT 455 PM.
  ROCKLEDGE AT 500 PM.

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

LAT...LON 4011 7499 3990 7517 3992 7544 3994 7554
          3999 7546 4007 7541 4011 7546
$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 5, 4:05 PM EDT	Severe Thunderstorm Warning	PHI	Chester	55 min
Jul 5, 4:27 PM EDT	Severe Thunderstorm Warning	PHI	Montgomery	33 min
Jul 5, 4:54 PM EDT	Severe Thunderstorm Warning	PHI	Bucks	66 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2003 Every severe thunderstorm warning in 2003

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.