Alert archive / New York / Mesoscale Discussions in 2011

Mesoscale Discussion 998

May 27, 20115 states

The Storm Prediction Center issued this mesoscale discussion at May 27, 2011, 5:49 PM EDT for 5 states. It was in force for 56 min.

The area

The outline as issued.

The facts

Issued: May 27, 2011, 5:49 PM EDT (21:49 UTC)
Expired: May 27, 2011, 6:45 PM EDT
In force: 56 min
Issued by: the Storm Prediction Center

All 48 counties

Berkshire County, MA, Franklin County, MA, Androscoggin County, ME, Cumberland County, ME, Franklin County, ME, Kennebec County, ME, Lincoln County, ME, Oxford County, ME, Penobscot County, ME, Piscataquis County, ME, Sagadahoc County, ME, Somerset County, ME, Waldo County, ME, York County, ME, Belknap County, NH, Carroll County, NH, Cheshire County, NH, Coos County, NH, Grafton County, NH, Merrimack County, NH, Strafford County, NH, Sullivan County, NH, Albany County, NY, Columbia County, NY, Essex County, NY, Fulton County, NY, Greene County, NY, Hamilton County, NY, Montgomery County, NY, Rensselaer County, NY, Saratoga County, NY, Schenectady County, NY, Schoharie County, NY, Ulster County, NY, Warren County, NY, Washington County, NY, Addison County, VT, Bennington County, VT, Caledonia County, VT, Chittenden County, VT, Essex County, VT, Lamoille County, VT, Orange County, VT, Orleans County, VT, Rutland County, VT, Washington County, VT, Windham County, VT, Windsor County, VT

The radar

The Burlington radar (KCXX), 127 km from the middle of the area, began a volume at 21:51 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

Gray, ME (KGYX), launched 12:00Z, 9.8 hours before the alert went out and 156 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: 625 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 8 m²/s²
0-3 km storm-relative helicity: 50 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 27, 1:18 PM EDT	Mesoscale Discussion	SPC	Franklin, Oxford, Penobscot, Somerset	87 min
May 27, 2:00 PM EDT	Severe Thunderstorm Watch	SPC	Androscoggin, Cumberland, Franklin, Hancock, Kennebec, Knox and 8 more	6 hr
May 27, 12:24 PM EDT	Mesoscale Discussion	SPC	Berkshire	96 min
May 27, 12:57 PM EDT	Severe Thunderstorm Watch	SPC	Broome, Chemung, Chenango, Cortland, Delaware, Madison and 5 more	9 hr
May 27, 6:14 PM EDT	Mesoscale Discussion	SPC	Broome, Chemung, Chenango, Cortland, Delaware, Fulton and 10 more	2 hr

Nearby

Mesoscale Discussions in New York, 2011 Mesoscale Discussions in Maine, 2011 Mesoscale Discussions in Vermont, 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.