Alert archive / New York / Mesoscale Discussions in 2009

Mesoscale Discussion 786

May 9, 20094 states

The Storm Prediction Center issued this mesoscale discussion at May 9, 2009, 6:47 PM EDT for 4 states. It was in force for 88 min.

The area

The outline as issued.

The facts

Issued: May 9, 2009, 6:47 PM EDT (22:47 UTC)
Expired: May 9, 2009, 8:15 PM EDT
In force: 88 min
Issued by: the Storm Prediction Center

Counties Berkshire County, MA, Franklin County, MA, Hampden County, MA, Hampshire County, MA, Worcester County, MA, York County, ME, Cheshire County, NH, Hillsborough County, NH, Rockingham County, NH, Strafford County, NH, Columbia County, NY, Dutchess County, NY, Orange County, NY, Putnam County, NY, Rockland County, NY, Ulster County, NY, Westchester County, NY

The nearest sounding before it

Albany, NY (KALY), launched 12:00Z, 10.8 hours before the alert went out and 104 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: 2 J/kg
Mixed-layer CIN: -87 J/kg
Mixed-layer LCL: 705 m above ground
0-6 km bulk shear: 54 kt
0-1 km storm-relative helicity: 41 m²/s²
0-3 km storm-relative helicity: 159 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
May 9, 3:40 PM EDT	Severe Thunderstorm Watch	SPC	Androscoggin, Cumberland, Franklin, Oxford, York	6 hr
May 9, 12:43 PM EDT	Severe Thunderstorm Watch	SPC	Berkshire	6 hr
May 9, 2:56 PM EDT	Mesoscale Discussion	SPC	Grafton, Sullivan	94 min
May 9, 11:52 AM EDT	Mesoscale Discussion	SPC	Albany, Allegany, Cayuga, Chenango, Cortland, Essex and 24 more	83 min

Nearby

Mesoscale Discussions in New York, 2009 Mesoscale Discussions in Massachusetts, 2009 Mesoscale Discussions in New Hampshire, 2009 Every 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.