Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2004
Severe Thunderstorm Warning 89, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jun 17, 2004, 2:37 PM EDT for Chester County, Pennsylvania. It was in force for 53 min. 2 reports came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Jun 17, 2004, 2:37 PM EDT (18:37 UTC)
- Expired
- Jun 17, 2004, 3:30 PM EDT
- In force
- 53 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Counties, with a storm outline in the text
County Chester County, PA
The radar
The Philadelphia radar (KDIX), 130 km from the middle of the area, began a volume at 18:39 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 17, 2:39 PM EDT | TSTM WND DMG | Terre Hill, PA | TREES DOWN AND POWER OUTAGES |
| Jun 17, 2:39 PM EDT | TSTM WND DMG | Terre Hill, PA | TREES DOWN AND POWER OUTAGES |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
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 17, 2:35 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
The nearest sounding before it
Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 6.6 hours before the alert went out and 69 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.
- Mixed-layer CAPE
- 456 J/kg
- Mixed-layer CIN
- -16 J/kg
- Mixed-layer LCL
- 655 m above ground
- 0-6 km bulk shear
- 26 kt
- 0-1 km storm-relative helicity
- 16 m²/s²
- 0-3 km storm-relative helicity
- 55 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
The text
As transmitted, in the capitals the NWS used until 2016.
000 WUUS51 KPHI 171837 SVRPHI PAC029-171930- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 237 PM EDT THU JUN 17 2004 THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... CENTRAL CHESTER COUNTY IN SOUTHEAST PENNSYLVANIA * UNTIL 330 PM EDT * AT 233 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED 9 MILES WEST OF HONEY BROOK...OR ABOUT 14 MILES NORTHEAST OF LANCASTER...AND MOVING SOUTHEAST AT 30 MPH. * THE SEVERE THUNDERSTORM WILL BE NEAR... HONEY BROOK BY 250 PM EDT PARKESBURG BY 300 PM EDT COATESVILLE BY 305 PM EDT DOWNINGTOWN BY 315 PM EDT WEST CHESTER AND 6 MILES NORTHEAST OF KENNETT SQUARE BY 325 PM EDT LAT...LON 4025 7609 4010 7621 3979 7575 3997 7549 $$ WN
The office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 17, 2:40 PM EDT | Severe Thunderstorm Warning | PHI | Chester | 50 min |
| Jun 17, 5:23 PM EDT | Special Marine Warning | PHI | 97 min | |
| Jun 17, 5:58 PM EDT | Severe Thunderstorm Warning | PHI | Carbon | 32 min |
| Jun 17, 6:27 PM EDT | Severe Thunderstorm Warning | PHI | Lehigh | 33 min |
| Jun 17, 6:45 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Northampton | 30 min |
| Jun 17, 7:08 PM EDT | Severe Thunderstorm Warning | PHI | Bucks | 52 min |
Nearby
Severe Thunderstorm Warnings in Pennsylvania, 2004Every severe thunderstorm warning in 2004
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.