Alert archive / New Jersey / Mesoscale Discussions in 2009

Mesoscale Discussion 1685

July 26, 200910 counties in New Jersey; 7 counties in New York; Bucks County, Pennsylvania

The Storm Prediction Center issued this mesoscale discussion at Jul 26, 2009, 10:06 PM EDT for 10 counties in New Jersey; 7 counties in New York; Bucks County, Pennsylvania. It was in force for 54 min.

The area

The outline as issued.

The facts

Issued: Jul 26, 2009, 10:06 PM EDT (02:06 UTC)
Expired: Jul 26, 2009, 11:00 PM EDT
In force: 54 min
Issued by: the Storm Prediction Center

Counties Bergen County, NJ, Essex County, NJ, Hudson County, NJ, Hunterdon County, NJ, Mercer County, NJ, Middlesex County, NJ, Morris County, NJ, Passaic County, NJ, Somerset County, NJ, Union County, NJ, Bronx County, NY, Kings County, NY, New York County, NY, Putnam County, NY, Richmond County, NY, Rockland County, NY, Westchester County, NY, Bucks County, PA

The radar

The Brookhaven radar (KOKX), 78 km from the middle of the area, began a volume at 02:08 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 00:00Z, 2.1 hours before the alert went out and 77 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: 807 J/kg
Mixed-layer CIN: -91 J/kg
Mixed-layer LCL: 738 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 160 m²/s²
0-3 km storm-relative helicity: 210 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 5.8

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 27, 2:20 PM EDT	Mesoscale Discussion	SPC		55 min
Jul 26, 8:21 PM EDT	Mesoscale Discussion	SPC	Cumberland	54 min

Nearby

Mesoscale Discussions in New Jersey, 2009 Mesoscale Discussions in New York, 2009 Mesoscale Discussions in Connecticut, 2009 Every mesoscale discussion in 2009

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.