Alert archive / New Jersey / Mesoscale Discussions in 2004

Mesoscale Discussion 2071

August 21, 20045 states

The Storm Prediction Center issued this mesoscale discussion at Aug 21, 2004, 3:08 PM EDT for 5 states. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Aug 21, 2004, 3:08 PM EDT (19:08 UTC)
Expired: Aug 21, 2004, 5:15 PM EDT
In force: 2 hr
Issued by: the Storm Prediction Center

All 36 counties

Bristol County, MA, Essex County, MA, Hampden County, MA, Middlesex County, MA, Norfolk County, MA, Suffolk County, MA, Worcester County, MA, Bergen County, NJ, Burlington County, NJ, Camden County, NJ, Essex County, NJ, Gloucester County, NJ, Hudson County, NJ, Mercer County, NJ, Middlesex County, NJ, Monmouth County, NJ, Ocean County, NJ, Somerset County, NJ, Union County, NJ, Bronx County, NY, Kings County, NY, Nassau County, NY, New York County, NY, Putnam County, NY, Queens County, NY, Richmond County, NY, Rockland County, NY, Suffolk County, NY, Westchester County, NY, Bucks County, PA, Delaware County, PA, Philadelphia County, PA, Bristol County, RI, Kent County, RI, Providence County, RI, Washington County, RI

The radar

The Brookhaven radar (KOKX), 18 km from the middle of the area, began a volume at 19:09 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, 7.1 hours before the alert went out and 18 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: 1043 J/kg
Mixed-layer CIN: -43 J/kg
Mixed-layer LCL: 802 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 156 m²/s²
0-3 km storm-relative helicity: 180 m²/s²
Significant tornado parameter: 0.7
Supercell composite: 5.6

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	Lasted
Aug 20, 8:22 PM EDT	Mesoscale Discussion	SPC	83 min
Aug 21, 11:48 AM EDT	Mesoscale Discussion	SPC	117 min
Aug 21, 1:25 PM EDT	Severe Thunderstorm Watch	SPC	5 hr
Aug 21, 4:35 PM EDT	Mesoscale Discussion	SPC	85 min

Nearby

Mesoscale Discussions in New Jersey, 2004 Mesoscale Discussions in New York, 2004 Mesoscale Discussions in Connecticut, 2004 Every mesoscale discussion in 2004

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.