Alert archive / New Jersey / Mesoscale Discussions in 2009

Mesoscale Discussion 1748

August 2, 20097 counties in New Jersey; 7 counties in New York

The Storm Prediction Center issued this mesoscale discussion at Aug 2, 2009, 12:23 PM EDT for 7 counties in New Jersey; 7 counties in New York. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Aug 2, 2009, 12:23 PM EDT (16:23 UTC)
Expired
Aug 2, 2009, 2:30 PM EDT
In force
2 hr
Issued by
the Storm Prediction Center

Counties Bergen County, NJ, Essex County, NJ, Hudson County, NJ, Middlesex County, NJ, Monmouth County, NJ, Ocean 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

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 4.4 hours before the alert went out and 82 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-pSkew-T log-p diagram, Brookhaven, NY at 12:00Z on 2009-08-02Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 105 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Brookhaven, NY at 12:00Z on 2009-08-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 73 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
105 J/kg
Mixed-layer CIN
-79 J/kg
Mixed-layer LCL
723 m above ground
0-6 km bulk shear
38 kt
0-1 km storm-relative helicity
73 m²/s²
0-3 km storm-relative helicity
111 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.5

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.

IssuedProductOfficeCountiesLasted
Aug 2, 10:01 AM EDTMesoscale DiscussionSPCBergen, Camden, Essex, Gloucester, Hudson, Hunterdon and 8 more119 min
Aug 2, 11:54 AM EDTMesoscale DiscussionSPCChenango, Clinton, Essex, Franklin, Fulton, Hamilton and 11 more2 hr

Nearby

Mesoscale Discussions in New Jersey, 2009Mesoscale Discussions in New York, 2009Mesoscale Discussions in Connecticut, 2009Every 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.