Alert archive / Ohio / Mesoscale Discussions in 2011

Mesoscale Discussion 1772

July 28, 201139 counties in Ohio; 8 counties in Pennsylvania; 10 counties in West Virginia

The Storm Prediction Center issued this mesoscale discussion at Jul 28, 2011, 3:43 PM EDT for 39 counties in Ohio; 8 counties in Pennsylvania; 10 counties in West Virginia. It was in force for 62 min.

The area

The outline as issued.

The facts

Issued
Jul 28, 2011, 3:43 PM EDT (19:43 UTC)
Expired
Jul 28, 2011, 4:45 PM EDT
In force
62 min
Issued by
the Storm Prediction Center
All 57 counties

Ashland County, OH, Belmont County, OH, Carroll County, OH, Columbiana County, OH, Coshocton County, OH, Crawford County, OH, Cuyahoga County, OH, Erie County, OH, Geauga County, OH, Guernsey County, OH, Hancock County, OH, Harrison County, OH, Henry County, OH, Holmes County, OH, Huron County, OH, Jefferson County, OH, Knox County, OH, Licking County, OH, Lorain County, OH, Lucas County, OH, Mahoning County, OH, Marion County, OH, Medina County, OH, Monroe County, OH, Morrow County, OH, Muskingum County, OH, Noble County, OH, Ottawa County, OH, Portage County, OH, Richland County, OH, Sandusky County, OH, Seneca County, OH, Stark County, OH, Summit County, OH, Trumbull County, OH, Tuscarawas County, OH, Wayne County, OH, Wood County, OH, Wyandot County, OH, Allegheny County, PA, Beaver County, PA, Butler County, PA, Fayette County, PA, Greene County, PA, Lawrence County, PA, Mercer County, PA, Washington County, PA, Brooke County, WV, Hancock County, WV, Harrison County, WV, Marion County, WV, Marshall County, WV, Monongalia County, WV, Ohio County, WV, Taylor County, WV, Tyler County, WV, Wetzel County, WV

The radar

The Pittsburgh radar (KPBZ), 88 km from the middle of the area, began a volume at 19:42 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.

The nearest sounding before it

Pittsburgh, PA (KPIT), launched 12:00Z, 7.7 hours before the alert went out and 100 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-pSkew-T log-p diagram, Pittsburgh, PA at 12:00Z on 2011-07-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 62 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Pittsburgh, PA at 12:00Z on 2011-07-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 189 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
62 J/kg
Mixed-layer CIN
-115 J/kg
Mixed-layer LCL
1137 m above ground
0-6 km bulk shear
32 kt
0-1 km storm-relative helicity
189 m²/s²
0-3 km storm-relative helicity
231 m²/s²
Significant tornado parameter
0.0
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.

IssuedProductOfficeCountiesLasted
Jul 28, 4:03 PM EDTSevere Thunderstorm WatchSPCAshland, Ashtabula, Belmont, Carroll, Columbiana, Coshocton and 30 more6 hr
Jul 28, 7:02 PM EDTMesoscale DiscussionSPCCarroll, Columbiana, Coshocton, Harrison, Holmes, Jefferson and 6 more58 min

Nearby

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