Alert archive / Pennsylvania / Mesoscale Discussions in 2003

Mesoscale Discussion 1673

July 7, 20037 counties in New Jersey; Orange County, Sullivan County, Ulster County, New York; 16 counties in Pennsylvania

The Storm Prediction Center issued this mesoscale discussion at Jul 7, 2003, 12:10 PM EDT for 7 counties in New Jersey; Orange County, Sullivan County, Ulster County, New York; 16 counties in Pennsylvania. It was in force for 65 min.

The area

The outline as issued.

The facts

Issued: Jul 7, 2003, 12:10 PM EDT (16:10 UTC)
Expired: Jul 7, 2003, 1:15 PM EDT
In force: 65 min
Issued by: the Storm Prediction Center

All 26 counties

Essex County, NJ, Hunterdon County, NJ, Morris County, NJ, Passaic County, NJ, Somerset County, NJ, Sussex County, NJ, Warren County, NJ, Orange County, NY, Sullivan County, NY, Ulster County, NY, Berks County, PA, Bucks County, PA, Carbon County, PA, Columbia County, PA, Lackawanna County, PA, Lebanon County, PA, Lehigh County, PA, Luzerne County, PA, Monroe County, PA, Montgomery County, PA, Northampton County, PA, Pike County, PA, Schuylkill County, PA, Susquehanna County, PA, Wayne County, PA, Wyoming County, PA

The radar

The Binghamton radar (KBGM), 121 km from the middle of the area, began a volume at 16:14 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

Severe Thunderstorm Watch 667Jul 7, 2:55 PM EDT

The nearest sounding before it

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 4.2 hours before the alert went out and 198 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: 38 J/kg
Mixed-layer CIN: -216 J/kg
Mixed-layer LCL: 1117 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 30 m²/s²
0-3 km storm-relative helicity: 49 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
Jul 7, 2:23 PM EDT	Mesoscale Discussion	SPC	Atlantic, Bergen, Burlington, Camden, Cape May, Cumberland and 15 more	67 min
Jul 7, 2:55 PM EDT	Severe Thunderstorm Watch	SPC	Bergen, Camden, Essex, Gloucester, Hudson, Hunterdon and 9 more	5 hr
Jul 7, 6:29 PM EDT	Mesoscale Discussion	SPC	Bergen, Camden, Essex, Gloucester, Hudson, Hunterdon and 9 more	61 min
Jul 7, 2:56 PM EDT	Mesoscale Discussion	SPC	Allegheny, Beaver, Butler, Crawford, Greene, Lawrence and 3 more	94 min
Jul 7, 3:10 PM EDT	Severe Thunderstorm Watch	SPC	Allegheny, Armstrong, Beaver, Butler, Cambria, Cameron and 14 more	6 hr
Jul 7, 6:52 PM EDT	Mesoscale Discussion	SPC	Allegheny, Armstrong, Beaver, Butler, Cameron, Clarion and 12 more	53 min

Nearby

Mesoscale Discussions in Pennsylvania, 2003 Mesoscale Discussions in New Jersey, 2003 Mesoscale Discussions in New York, 2003 Every mesoscale discussion 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.