Alert archive / Ohio / Mesoscale Discussions in 2011

Mesoscale Discussion 1811

August 1, 20114 states

The Storm Prediction Center issued this mesoscale discussion at Aug 1, 2011, 8:01 AM EDT for 4 states. It was in force for 89 min.

The area

The outline as issued.

The facts

Issued: Aug 1, 2011, 8:01 AM EDT (12:01 UTC)
Expired: Aug 1, 2011, 9:30 AM EDT
In force: 89 min
Issued by: the Storm Prediction Center

All 47 counties

Monroe County, MI, Allegany County, NY, Cattaraugus County, NY, Chautauqua County, NY, Chemung County, NY, Erie County, NY, Genesee County, NY, Livingston County, NY, Niagara County, NY, Ontario County, NY, Schuyler County, NY, Seneca County, NY, Steuben County, NY, Tioga County, NY, Tompkins County, NY, Wyoming County, NY, Yates County, NY, Ashtabula County, OH, Cuyahoga County, OH, Erie County, OH, Fulton County, OH, Geauga County, OH, Huron County, OH, Lake County, OH, Lorain County, OH, Lucas County, OH, Medina County, OH, Ottawa County, OH, Portage County, OH, Sandusky County, OH, Seneca County, OH, Summit County, OH, Trumbull County, OH, Wood County, OH, Bradford County, PA, Cameron County, PA, Clarion County, PA, Crawford County, PA, Elk County, PA, Erie County, PA, Forest County, PA, McKean County, PA, Mercer County, PA, Potter County, PA, Tioga County, PA, Venango County, PA, Warren County, PA

The radar

The Buffalo radar (KBUF), 135 km from the middle of the area, began a volume at 12:01 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

Buffalo Intl Airport, NY (KBUF), launched 12:00Z, 0.0 hours before the alert went out and 135 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: 2422 J/kg
Mixed-layer CIN: -21 J/kg
Mixed-layer LCL: 692 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: -10 m²/s²
0-3 km storm-relative helicity: 59 m²/s²
Significant tornado parameter: -0.2
Supercell composite: -1.2

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 1, 3:47 AM EDT	Mesoscale Discussion	SPC	Bay, Clinton, Genesee, Gladwin, Gratiot, Ingham and 12 more	58 min
Aug 1, 1:06 PM EDT	Mesoscale Discussion	SPC	Branch, Calhoun, Eaton, Hillsdale, Jackson, Lenawee and 2 more	24 min
Aug 1, 12:07 PM EDT	Mesoscale Discussion	SPC	Albany, Allegany, Broome, Chemung, Chenango, Columbia and 21 more	53 min
Aug 1, 2:15 PM EDT	Mesoscale Discussion	SPC	Dutchess, Orange, Putnam, Rockland, Sullivan, Ulster and 1 more	90 min
Aug 1, 2:34 PM EDT	Severe Thunderstorm Watch	SPC	Nassau, Suffolk	6 hr
Aug 1, 6:18 PM EDT	Mesoscale Discussion	SPC	Bronx, Dutchess, Kings, Nassau, New York, Orange and 6 more	57 min
Aug 1, 1:19 PM EDT	Severe Thunderstorm Watch	SPC	Allen, Ashland, Ashtabula, Auglaize, Belmont, Carroll and 49 more	6 hr
Aug 1, 3:39 PM EDT	Mesoscale Discussion	SPC	Allen, Ashland, Ashtabula, Auglaize, Belmont, Carroll and 64 more	66 min
Aug 1, 3:22 PM EDT	Mesoscale Discussion	SPC	Adams, Bedford, Berks, Bucks, Chester, Cumberland and 19 more	83 min

Nearby

Mesoscale Discussions in Ohio, 2011 Mesoscale Discussions in New York, 2011 Mesoscale Discussions in Pennsylvania, 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.