Alert archive / New York / Mesoscale Discussions in 2011

Mesoscale Discussion 2073

August 28, 20114 states

The Storm Prediction Center issued this mesoscale discussion at Aug 28, 2011, 4:01 AM EDT for 4 states. It was in force for 89 min.

The area

The outline as issued.

The facts

Issued: Aug 28, 2011, 4:01 AM EDT (08:01 UTC)
Expired: Aug 28, 2011, 5:30 AM EDT
In force: 89 min
Issued by: the Storm Prediction Center

Counties Dukes County, MA, Bergen County, NJ, Essex County, NJ, Hudson County, NJ, Mercer County, NJ, Middlesex County, NJ, Monmouth 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, Rockland County, NY, Suffolk County, NY, Westchester County, NY, Newport County, RI, Washington County, RI

The radar

The Brookhaven radar (KOKX), 30 km from the middle of the area, began a volume at 08:02 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

Tornado Watch 813Aug 28, 4:40 AM EDT

The nearest sounding before it

Brookhaven, NY (KOKX), launched 00:00Z, 8.0 hours before the alert went out and 30 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: 957 J/kg
Mixed-layer CIN: -1 J/kg
Mixed-layer LCL: 466 m above ground
0-6 km bulk shear: 14 kt
0-1 km storm-relative helicity: 110 m²/s²
0-3 km storm-relative helicity: 269 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 28, 12:30 AM EDT	Mesoscale Discussion	SPC		90 min
Aug 28, 4:38 AM EDT	Tornado Watch	SPC	Greater Bridgeport Planning Region, Lower Connecticut River Valley Planning Region, Naugatuck Valley Planning Region, Southeastern Connecticut Planning Region	5 hr
Aug 28, 8:09 AM EDT	Mesoscale Discussion	SPC		2 hr

Nearby

Mesoscale Discussions in New York, 2011 Mesoscale Discussions in New Jersey, 2011 Mesoscale Discussions in Connecticut, 2011 Every mesoscale discussion in 2011

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.