Alert archive / New Jersey / Mesoscale Discussions in 2007

Mesoscale Discussion 1783

August 17, 200710 counties in New Jersey; 6 counties in New York

The Storm Prediction Center issued this mesoscale discussion at Aug 17, 2007, 6:04 PM EDT for 10 counties in New Jersey; 6 counties in New York. It was in force for 116 min.

The area

The outline as issued.

The facts

Issued: Aug 17, 2007, 6:04 PM EDT (22:04 UTC)
Expired: Aug 17, 2007, 8:00 PM EDT
In force: 116 min
Issued by: the Storm Prediction Center

Counties Bergen County, NJ, Essex County, NJ, Hudson County, NJ, Hunterdon County, NJ, Middlesex County, NJ, Monmouth County, NJ, Morris County, NJ, Passaic County, NJ, Somerset County, NJ, Union County, NJ, Bronx County, NY, Kings County, NY, Nassau County, NY, New York County, NY, Queens County, NY, Richmond County, NY

The radar

The Philadelphia radar (KDIX), 83 km from the middle of the area, began a volume at 22:04 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, 10.1 hours before the alert went out and 96 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: 120 J/kg
Mixed-layer CIN: -267 J/kg
Mixed-layer LCL: 1465 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: -31 m²/s²
0-3 km storm-relative helicity: 44 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.4

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
Aug 17, 1:13 PM EDT	Mesoscale Discussion	SPC	Burlington, Camden, Gloucester, Hunterdon, Mercer, Middlesex and 2 more	92 min
Aug 17, 1:37 PM EDT	Severe Thunderstorm Watch	SPC	Atlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 10 more	6 hr
Aug 17, 3:41 PM EDT	Mesoscale Discussion	SPC	Burlington, Camden, Essex, Gloucester, Hunterdon, Mercer and 6 more	94 min
Aug 17, 7:05 PM EDT	Mesoscale Discussion	SPC	Allegany, Broome, Chemung, Chenango, Cortland, Madison and 9 more	85 min

Nearby

Mesoscale Discussions in New Jersey, 2007 Mesoscale Discussions in New York, 2007 Every mesoscale discussion in 2007

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.