Alert archive / Ohio / Mesoscale Discussions in 2011

Mesoscale Discussion 138

February 25, 20114 states

The Storm Prediction Center issued this mesoscale discussion at Feb 25, 2011, 2:46 AM EST for 4 states. It was in force for 4 hr.

The area

The outline as issued.

The facts

Issued: Feb 25, 2011, 2:46 AM EST (07:46 UTC)
Expired: Feb 25, 2011, 6:45 AM EST
In force: 4 hr
Issued by: the Storm Prediction Center

All 68 counties

Monroe County, MI, Allegany County, NY, Cattaraugus County, NY, Cayuga County, NY, Chautauqua County, NY, Chemung County, NY, Cortland County, NY, Erie County, NY, Genesee County, NY, Livingston County, NY, Monroe County, NY, Niagara County, NY, Ontario County, NY, Orleans County, NY, Schuyler County, NY, Seneca County, NY, Steuben County, NY, Tioga County, NY, Tompkins County, NY, Wayne County, NY, Wyoming County, NY, Yates County, NY, Allen County, OH, Ashland County, OH, Ashtabula County, OH, Auglaize County, OH, Crawford County, OH, Cuyahoga County, OH, Erie County, OH, Geauga County, OH, Hancock County, OH, Hardin County, OH, Henry County, OH, Huron County, OH, Lake County, OH, Logan County, OH, Lorain County, OH, Lucas County, OH, Mahoning County, OH, Marion County, OH, Medina County, OH, Morrow County, OH, Ottawa County, OH, Paulding County, OH, Portage County, OH, Putnam County, OH, Richland County, OH, Sandusky County, OH, Seneca County, OH, Shelby County, OH, Stark County, OH, Summit County, OH, Trumbull County, OH, Wayne County, OH, Wood County, OH, Wyandot County, OH, Bradford County, PA, Cameron 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), 124 km from the middle of the area, began a volume at 07:48 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 00:00Z, 7.8 hours before the alert went out and 124 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: 479 m above ground
0-6 km bulk shear: 69 kt
0-1 km storm-relative helicity: 9 m²/s²
0-3 km storm-relative helicity: 119 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
Feb 24, 10:41 PM EST	Mesoscale Discussion	SPC	Lenawee, Monroe	6 hr
Feb 25, 4:28 AM EST	Mesoscale Discussion	SPC	Albany, Broome, Cayuga, Chenango, Cortland, Essex and 17 more	6 hr
Feb 25, 11:36 AM EST	Mesoscale Discussion	SPC	Chester, Delaware, Philadelphia	84 min
Feb 25, 12:19 PM EST	Severe Thunderstorm Watch	SPC	Delaware, Philadelphia	3 hr

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.