Alert archive / Pennsylvania / Mesoscale Discussions in 2004
Mesoscale Discussion 559
The Storm Prediction Center issued this mesoscale discussion at May 2, 2004, 5:48 PM EDT for 5 states. It was in force for 117 min.
The area
The outline as issued.
The facts
- Issued
- May 2, 2004, 5:48 PM EDT (21:48 UTC)
- Expired
- May 2, 2004, 7:45 PM EDT
- In force
- 117 min
- Issued by
- the Storm Prediction Center
All 51 counties
Baltimore County, MD, Carroll County, MD, Frederick County, MD, Howard County, MD, Montgomery County, MD, Prince George's County, MD, Washington County, MD, Broome County, NY, Cayuga County, NY, Chemung County, NY, Chenango County, NY, Cortland County, NY, Lewis County, NY, Madison County, NY, Oneida County, NY, Onondaga County, NY, Oswego County, NY, Schuyler County, NY, Tioga County, NY, Tompkins County, NY, Adams County, PA, Bradford County, PA, Columbia County, PA, Cumberland County, PA, Dauphin County, PA, Franklin County, PA, Lebanon County, PA, Lycoming County, PA, Montour County, PA, Northumberland County, PA, Perry County, PA, Schuylkill County, PA, Snyder County, PA, Sullivan County, PA, Susquehanna County, PA, Union County, PA, Wyoming County, PA, York County, PA, Arlington County, VA, City of Alexandria, VA, City of Fairfax, VA, City of Falls Church, VA, City of Manassas Park, VA, City of Winchester, VA, Clarke County, VA, Fairfax County, VA, Frederick County, VA, Loudoun County, VA, Warren County, VA, Berkeley County, WV, Jefferson County, WV
The nearest sounding before it
Washington/Dulle, VA (KIAD), launched 12:00Z, 9.8 hours before the alert went out and 201 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
The text
As transmitted, in the capitals the NWS used until 2016.
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</html>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, 3:20 PM EDT | Severe Thunderstorm Watch | SPC | Allegany, Frederick, Washington | 6 hr |
| May 2, 5:45 PM EDT | Severe Thunderstorm Watch | SPC | Charles, Prince George's | 5 hr |
| 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
Mesoscale Discussions in Pennsylvania, 2004Mesoscale Discussions in New York, 2004Mesoscale Discussions in Virginia, 2004Every mesoscale discussion 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.