Alert archive / New Jersey / Mesoscale Discussions in 2014

Mesoscale Discussion 1646

August 31, 20148 states

The Storm Prediction Center issued this mesoscale discussion at Aug 31, 2014, 4:32 PM EDT for 8 states. It was in force for 118 min.

The area

The outline as issued.

The facts

Issued: Aug 31, 2014, 4:32 PM EDT (20:32 UTC)
Expired: Aug 31, 2014, 6:30 PM EDT
In force: 118 min
Issued by: the Storm Prediction Center
Chance of a watch: 20%

All 41 counties

New Castle County, DE, Essex County, MA, Middlesex County, MA, Norfolk County, MA, Suffolk County, MA, Worcester County, MA, Baltimore County, MD, Cecil County, MD, City of Baltimore, MD, Harford County, MD, Kent County, MD, Rockingham County, NH, Bergen County, NJ, Burlington County, NJ, Camden County, NJ, Cumberland County, NJ, Essex County, NJ, Gloucester County, NJ, Hudson County, NJ, Mercer County, NJ, Middlesex County, NJ, Monmouth County, NJ, Ocean County, NJ, Salem 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, Suffolk County, NY, Westchester County, NY, Bucks County, PA, Chester County, PA, Delaware County, PA, Montgomery County, PA, Philadelphia County, PA, Kent County, RI, Providence County, RI

The radar

The Brookhaven radar (KOKX), 71 km from the middle of the area, began a volume at 20:31 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, 8.5 hours before the alert went out and 71 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: 30 J/kg
Mixed-layer CIN: -81 J/kg
Mixed-layer LCL: 672 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 181 m²/s²
0-3 km storm-relative helicity: 190 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
Aug 31, 1:30 PM EDT	Mesoscale Discussion	SPC		3 hr

Nearby

Mesoscale Discussions in New Jersey, 2014 Mesoscale Discussions in Connecticut, 2014 Mesoscale Discussions in New York, 2014 Every mesoscale discussion in 2014

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.