Alert archive / New Jersey / Mesoscale Discussions in 2011

Mesoscale Discussion 1753

July 26, 201114 counties in New Jersey; 8 counties in New York; 12 counties in Pennsylvania

The Storm Prediction Center issued this mesoscale discussion at Jul 26, 2011, 5:24 PM EDT for 14 counties in New Jersey; 8 counties in New York; 12 counties in Pennsylvania. It was in force for 66 min.

The area

The outline as issued.

The facts

Issued: Jul 26, 2011, 5:24 PM EDT (21:24 UTC)
Expired: Jul 26, 2011, 6:30 PM EDT
In force: 66 min
Issued by: the Storm Prediction Center

All 34 counties

Bergen County, NJ, Burlington County, NJ, Essex County, NJ, Hudson County, NJ, Hunterdon County, NJ, Mercer County, NJ, Middlesex County, NJ, Monmouth County, NJ, Morris County, NJ, Passaic County, NJ, Somerset County, NJ, Sussex County, NJ, Union County, NJ, Warren County, NJ, Bronx County, NY, Kings County, NY, Nassau County, NY, New York County, NY, Queens County, NY, Richmond County, NY, Rockland County, NY, Westchester County, NY, Berks County, PA, Bucks County, PA, Carbon County, PA, Dauphin County, PA, Lebanon County, PA, Lehigh County, PA, Luzerne County, PA, Monroe County, PA, Montgomery County, PA, Northampton County, PA, Philadelphia County, PA, Schuylkill County, PA

The radar

The Philadelphia radar (KDIX), 78 km from the middle of the area, began a volume at 21:26 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

Brookhaven, NY (KOKX), launched 12:00Z, 9.4 hours before the alert went out and 136 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: 76 J/kg
Mixed-layer CIN: -31 J/kg
Mixed-layer LCL: 509 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: 29 m²/s²
0-3 km storm-relative helicity: 70 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 26, 1:34 PM EDT	Mesoscale Discussion	SPC	Bergen, Passaic	86 min
Jul 26, 11:05 AM EDT	Mesoscale Discussion	SPC	Albany, Cayuga, Chemung, Chenango, Clinton, Columbia and 33 more	55 min
Jul 26, 11:28 AM EDT	Severe Thunderstorm Watch	SPC	Albany, Broome, Cayuga, Chemung, Chenango, Clinton and 33 more	8 hr
Jul 26, 2:30 PM EDT	Severe Thunderstorm Watch	SPC	Orange, Putnam, Rockland, Westchester	8 hr
Jul 26, 3:39 PM EDT	Mesoscale Discussion	SPC	Albany, Broome, Chemung, Chenango, Clinton, Columbia and 26 more	66 min
Jul 26, 6:17 PM EDT	Mesoscale Discussion	SPC	Dutchess, Orange, Putnam, Sullivan, Ulster, Westchester	58 min

Nearby

Mesoscale Discussions in New Jersey, 2011 Mesoscale Discussions in Pennsylvania, 2011 Mesoscale Discussions in New York, 2011 Every mesoscale discussion in 2011

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.