Alert archive / Ohio / Mesoscale Discussions in 2011

Mesoscale Discussion 1692

July 22, 20114 states

The Storm Prediction Center issued this mesoscale discussion at Jul 22, 2011, 5:19 PM EDT for 4 states. It was in force for 56 min.

The area

The outline as issued.

The facts

Issued: Jul 22, 2011, 5:19 PM EDT (21:19 UTC)
Expired: Jul 22, 2011, 6:15 PM EDT
In force: 56 min
Issued by: the Storm Prediction Center

All 45 counties

Allegany County, MD, Garrett County, MD, Belmont County, OH, Carroll County, OH, Columbiana County, OH, Coshocton County, OH, Geauga County, OH, Guernsey County, OH, Harrison County, OH, Holmes County, OH, Jefferson County, OH, Mahoning County, OH, Monroe County, OH, Noble County, OH, Portage County, OH, Stark County, OH, Summit County, OH, Trumbull County, OH, Tuscarawas County, OH, Allegheny County, PA, Armstrong County, PA, Beaver County, PA, Butler County, PA, Cambria County, PA, Clarion County, PA, Fayette County, PA, Greene County, PA, Indiana County, PA, Lawrence County, PA, Mercer County, PA, Somerset County, PA, Venango County, PA, Washington County, PA, Westmoreland County, PA, Brooke County, WV, Hancock County, WV, Marion County, WV, Marshall County, WV, Mineral County, WV, Monongalia County, WV, Ohio County, WV, Preston County, WV, Taylor County, WV, Tyler County, WV, Wetzel County, WV

The radar

The Pittsburgh radar (KPBZ), 36 km from the middle of the area, began a volume at 21:21 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.

Severe Thunderstorm Watch 672Jul 22, 5:40 PM EDT

The nearest sounding before it

Pittsburgh, PA (KPIT), launched 12:00Z, 9.3 hours before the alert went out and 48 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: 3887 J/kg
Mixed-layer CIN: -34 J/kg
Mixed-layer LCL: 868 m above ground
0-6 km bulk shear: 17 kt
0-1 km storm-relative helicity: -61 m²/s²
0-3 km storm-relative helicity: -29 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
Jul 22, 3:17 PM EDT	Mesoscale Discussion	SPC	Allegany, Carroll, Frederick, Garrett, Howard, Montgomery and 1 more	58 min
Jul 22, 5:37 PM EDT	Severe Thunderstorm Watch	SPC	Garrett	4 hr
Jul 22, 11:20 AM EDT	Mesoscale Discussion	SPC	Allen, Auglaize, Champaign, Clark, Crawford, Darke and 33 more	55 min
Jul 22, 12:50 PM EDT	Mesoscale Discussion	SPC	Allen, Ashland, Auglaize, Champaign, Clark, Clinton and 43 more	55 min
Jul 22, 1:14 PM EDT	Severe Thunderstorm Watch	SPC	Allen, Ashland, Auglaize, Champaign, Clark, Clinton and 45 more	7 hr
Jul 22, 4:32 PM EDT	Mesoscale Discussion	SPC	Allen, Ashland, Auglaize, Champaign, Clark, Clinton and 41 more	88 min
Jul 22, 5:59 PM EDT	Mesoscale Discussion	SPC	Gallia, Lawrence	2 hr
Jul 22, 7:10 PM EDT	Mesoscale Discussion	SPC	Clark, Clinton, Coshocton, Delaware, Fairfield, Fayette and 14 more	35 min

Nearby

Mesoscale Discussions in Ohio, 2011 Mesoscale Discussions in Pennsylvania, 2011 Mesoscale Discussions in West Virginia, 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.