Alert archive / New York / Mesoscale Discussions in 2003

Mesoscale Discussion 322

March 21, 20037 counties in New Jersey; 13 counties in New York

The Storm Prediction Center issued this mesoscale discussion at Mar 21, 2003, 5:45 PM EST for 7 counties in New Jersey; 13 counties in New York. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Mar 21, 2003, 5:45 PM EST (22:45 UTC)
Expired: Mar 21, 2003, 7:45 PM EST
In force: 2 hr
Issued by: the Storm Prediction Center

Counties Bergen County, NJ, Essex County, NJ, Hudson County, NJ, Morris County, NJ, Passaic County, NJ, Sussex County, NJ, Union County, NJ, Bronx County, NY, Columbia County, NY, Dutchess County, NY, Kings County, NY, Nassau County, NY, New York County, NY, Orange County, NY, Putnam County, NY, Queens County, NY, Richmond County, NY, Rockland County, NY, Ulster County, NY, Westchester County, NY

The radar

The Brookhaven radar (KOKX), 72 km from the middle of the area, began a volume at 22:45 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, 10.8 hours before the alert went out and 72 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 425 m above ground
0-6 km bulk shear: 88 kt
0-1 km storm-relative helicity: 214 m²/s²
0-3 km storm-relative helicity: 187 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

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
Mar 21, 12:18 PM EST	Mesoscale Discussion	SPC	Allegany, Cattaraugus	117 min

Nearby

Mesoscale Discussions in New York, 2003 Mesoscale Discussions in New Jersey, 2003 Mesoscale Discussions in Connecticut, 2003 Every mesoscale discussion in 2003

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.