Alert archive / Pennsylvania / Mesoscale Discussions in 2008

Mesoscale Discussion 1871

July 23, 2008Sussex County, Warren County, New Jersey; Sullivan County, New York; 19 counties in Pennsylvania

The Storm Prediction Center issued this mesoscale discussion at Jul 23, 2008, 3:29 AM EDT for Sussex County, Warren County, New Jersey; Sullivan County, New York; 19 counties in Pennsylvania. It was in force for 91 min.

The area

The outline as issued.

The facts

Issued: Jul 23, 2008, 3:29 AM EDT (07:29 UTC)
Expired: Jul 23, 2008, 5:00 AM EDT
In force: 91 min
Issued by: the Storm Prediction Center

All 22 counties

Sussex County, NJ, Warren County, NJ, Sullivan County, NY, Berks County, PA, Carbon County, PA, Columbia County, PA, Lackawanna County, PA, Lehigh County, PA, Luzerne County, PA, Lycoming County, PA, Monroe County, PA, Montour County, PA, Northampton County, PA, Northumberland County, PA, Pike County, PA, Schuylkill County, PA, Snyder County, PA, Sullivan County, PA, Susquehanna County, PA, Union County, PA, Wayne County, PA, Wyoming County, PA

The nearest sounding before it

Albany, NY (KALY), launched 00:00Z, 7.5 hours before the alert went out and 257 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: 1357 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: -34 m²/s²
0-3 km storm-relative helicity: -8 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 23, 12:33 PM EDT	Mesoscale Discussion	SPC	Atlantic, Burlington, Camden, Cape May, Cumberland, Essex and 9 more	57 min
Jul 23, 2:34 PM EDT	Severe Thunderstorm Watch	SPC	Atlantic, Bergen, Burlington, Camden, Cape May, Cumberland and 15 more	7 hr
Jul 23, 4:11 PM EDT	Mesoscale Discussion	SPC	Bergen, Essex, Hudson, Mercer, Middlesex, Monmouth and 3 more	94 min
Jul 23, 1:28 PM EDT	Mesoscale Discussion	SPC	Cattaraugus	62 min
Jul 23, 2:12 PM EDT	Severe Thunderstorm Watch	SPC	Allegany, Broome, Cayuga, Chemung, Chenango, Cortland and 22 more	6 hr

Nearby

Mesoscale Discussions in Pennsylvania, 2008 Mesoscale Discussions in New Jersey, 2008 Mesoscale Discussions in New York, 2008 Every mesoscale discussion in 2008

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.