Alert archive / Pennsylvania / Severe Thunderstorm Watches in 2004
Severe Thunderstorm Watch 147
The Storm Prediction Center issued this severe thunderstorm watch at May 2, 2004, 3:20 PM EDT for 5 states. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- May 2, 2004, 3:20 PM EDT (19:20 UTC)
- Expired
- May 2, 2004, 9:00 PM EDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
All 52 counties
Allegany County, MD, Frederick County, MD, Washington County, MD, Cayuga County, NY, Chemung County, NY, Cortland County, NY, Lewis County, NY, Madison County, NY, Oneida County, NY, Onondaga County, NY, Ontario County, NY, Oswego County, NY, Schuyler County, NY, Seneca County, NY, Steuben County, NY, Tioga County, NY, Tompkins County, NY, Wayne County, NY, Yates County, NY, Adams County, PA, Bedford County, PA, Blair County, PA, Bradford County, PA, Centre County, PA, Clinton County, PA, Columbia County, PA, Cumberland County, PA, Dauphin County, PA, Franklin County, PA, Fulton County, PA, Huntingdon County, PA, Juniata County, PA, Lycoming County, PA, Mifflin County, PA, Montour County, PA, Northumberland County, PA, Perry County, PA, Potter County, PA, Snyder County, PA, Sullivan County, PA, Tioga County, PA, Union County, PA, City of Winchester, VA, Clarke County, VA, Frederick County, VA, Loudoun County, VA, Berkeley County, WV, Hampshire County, WV, Hardy County, WV, Jefferson County, WV, Mineral County, WV, Morgan County, WV
Warnings issued inside it
6 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 2, 5:56 PM EDT | Severe Thunderstorm Warning | CTP | Union | 19 min |
| May 2, 6:05 PM EDT | Severe Thunderstorm Warning | BGM | Chemung, Tioga | 40 min |
| May 2, 6:40 PM EDT | Severe Thunderstorm Warning | BGM | Bradford | 50 min |
| May 2, 7:29 PM EDT | Severe Thunderstorm Warning | LWX | Clarke | 46 min |
| May 2, 7:51 PM EDT | Severe Thunderstorm Warning | LWX | Loudoun | 84 min |
| May 2, 8:25 PM EDT | Severe Thunderstorm Warning | LWX | Frederick | 80 min |
Discussions around it
SPC mesoscale discussions over the same counties from four hours before the watch to its end.
The nearest sounding before it
Washington/Dulle, VA (KIAD), launched 12:00Z, 7.3 hours before the alert went out and 225 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
- 44 J/kg
- Mixed-layer CIN
- -24 J/kg
- Mixed-layer LCL
- 486 m above ground
- 0-6 km bulk shear
- 21 kt
- 0-1 km storm-relative helicity
- 113 m²/s²
- 0-3 km storm-relative helicity
- 134 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 2, 1:21 PM EDT | Mesoscale Discussion | SPC | Allegany, Frederick, Garrett, Washington | 114 min |
| May 2, 5:45 PM EDT | Severe Thunderstorm Watch | SPC | Charles, Prince George's | 5 hr |
| May 2, 5:48 PM EDT | Mesoscale Discussion | SPC | Baltimore, Carroll, Frederick, Howard, Montgomery, Prince George's and 1 more | 117 min |
| May 2, 7:24 PM EDT | Mesoscale Discussion | SPC | Charles, Prince George's | 2 hr |
| May 2, 6:54 PM EDT | Mesoscale Discussion | SPC | Delaware, Orange, Sullivan, Ulster | 96 min |
Nearby
Severe Thunderstorm Watches in Pennsylvania, 2004Severe Thunderstorm Watches in New York, 2004Severe Thunderstorm Watches in West Virginia, 2004Every severe thunderstorm watch 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; the sounding from the Mesonet's radiosonde archive.