Alert archive / Pennsylvania / Mesoscale Discussions in 2004

Mesoscale Discussion 2245

September 18, 20044 states

The Storm Prediction Center issued this mesoscale discussion at Sep 18, 2004, 5:10 AM EDT for 4 states. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Sep 18, 2004, 5:10 AM EDT (09:10 UTC)
Expired: Sep 18, 2004, 7:15 AM EDT
In force: 2 hr
Issued by: the Storm Prediction Center

All 41 counties

Berkshire County, MA, Franklin County, MA, Hampden County, MA, Hampshire County, MA, Hunterdon County, NJ, Morris County, NJ, Passaic County, NJ, Sussex County, NJ, Warren County, NJ, Albany County, NY, Columbia County, NY, Delaware County, NY, Dutchess County, NY, Greene County, NY, Orange County, NY, Putnam County, NY, Rensselaer County, NY, Rockland County, NY, Sullivan County, NY, Ulster County, NY, Berks County, PA, Bucks County, PA, Carbon County, PA, Chester County, PA, Columbia County, PA, Dauphin County, PA, Delaware County, PA, Lackawanna County, PA, Lancaster County, PA, Lebanon County, PA, Lehigh County, PA, Luzerne County, PA, Monroe County, PA, Montgomery County, PA, Northampton County, PA, Northumberland County, PA, Pike County, PA, Schuylkill County, PA, Wayne County, PA, Wyoming County, PA, York County, PA

The radar

The Binghamton radar (KBGM), 134 km from the middle of the area, began a volume at 09:13 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

Albany, NY (KALY), launched 00:00Z, 9.2 hours before the alert went out and 168 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 573 m above ground
0-6 km bulk shear: 52 kt
0-1 km storm-relative helicity: -8 m²/s²
0-3 km storm-relative helicity: 150 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.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Sep 18, 2:39 AM EDT	Mesoscale Discussion	SPC	Atlantic, Bergen, Burlington, Camden, Cape May, Cumberland and 15 more	2 hr
Sep 17, 9:58 PM EDT	Mesoscale Discussion	SPC	Adams, Franklin, Fulton, Lancaster, York	2 hr

Nearby

Mesoscale Discussions in Pennsylvania, 2004 Mesoscale Discussions in New York, 2004 Mesoscale Discussions in New Jersey, 2004 Every 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; radar from the NEXRAD Level II archive.