Alert archive / New York / Mesoscale Discussions in 2007

Mesoscale Discussion 817

May 16, 20075 states

The Storm Prediction Center issued this mesoscale discussion at May 16, 2007, 11:57 AM EDT for 5 states. It was in force for 93 min.

The area

The outline as issued.

The facts

Issued: May 16, 2007, 11:57 AM EDT (15:57 UTC)
Expired: May 16, 2007, 1:30 PM EDT
In force: 93 min
Issued by: the Storm Prediction Center

All 29 counties

Berkshire County, MA, Franklin County, MA, Hampden County, MA, Hampshire County, MA, Middlesex County, MA, Worcester County, MA, Bergen County, NJ, Morris County, NJ, Passaic County, NJ, Sussex County, NJ, Warren County, NJ, Albany County, NY, Columbia County, NY, Delaware County, NY, Dutchess County, NY, Greene County, NY, Orange County, NY, Putnam County, NY, Rensselaer County, NY, Rockland County, NY, Schenectady County, NY, Schoharie County, NY, Sullivan County, NY, Ulster County, NY, Westchester County, NY, Monroe County, PA, Pike County, PA, Wayne County, PA, Providence County, RI

The radar

The Albany radar (KENX), 93 km from the middle of the area, began a volume at 15:56 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.

The nearest sounding before it

Albany, NY (KALY), launched 12:00Z, 4.0 hours before the alert went out and 92 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: 210 J/kg
Mixed-layer CIN: -80 J/kg
Mixed-layer LCL: 969 m above ground
0-6 km bulk shear: 56 kt
0-1 km storm-relative helicity: 183 m²/s²
0-3 km storm-relative helicity: 193 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 1.5

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.

Issued	Product	Office	Counties	Lasted
May 16, 12:32 PM EDT	Tornado Watch	SPC	Greater Bridgeport Planning Region, Capitol Planning Region, Northwest Hills Planning Region, Lower Connecticut River Valley Planning Region, Naugatuck Valley Planning Region, Southeastern Connecticut Planning Region and 1 more	6 hr
May 16, 2:43 PM EDT	Mesoscale Discussion	SPC		92 min
May 16, 12:56 PM EDT	Mesoscale Discussion	SPC	Bergen, Essex, Hunterdon, Morris, Passaic, Somerset and 2 more	64 min
May 16, 1:26 PM EDT	Severe Thunderstorm Watch	SPC	Atlantic, Bergen, Burlington, Camden, Cape May, Cumberland and 15 more	7 hr
May 16, 3:46 PM EDT	Mesoscale Discussion	SPC	Atlantic, Bergen, Burlington, Camden, Cape May, Cumberland and 15 more	89 min
May 16, 12:46 AM EDT	Mesoscale Discussion	SPC	Allegheny, Beaver, Butler, Lawrence, Washington	59 min

Nearby

Mesoscale Discussions in New York, 2007 Mesoscale Discussions in Massachusetts, 2007 Mesoscale Discussions in Connecticut, 2007 Every mesoscale discussion in 2007

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.