Alert archive / Ohio / Mesoscale Discussions in 2011

Mesoscale Discussion 1782

July 29, 201141 counties in Ohio; 15 counties in Pennsylvania; 6 counties in West Virginia

The Storm Prediction Center issued this mesoscale discussion at Jul 29, 2011, 2:06 PM EDT for 41 counties in Ohio; 15 counties in Pennsylvania; 6 counties in West Virginia. It was in force for 84 min.

The area

The outline as issued.

The facts

Issued
Jul 29, 2011, 2:06 PM EDT (18:06 UTC)
Expired
Jul 29, 2011, 3:30 PM EDT
In force
84 min
Issued by
the Storm Prediction Center
All 62 counties

Ashland County, OH, Belmont County, OH, Carroll County, OH, Champaign County, OH, Clark County, OH, Columbiana County, OH, Coshocton County, OH, Crawford County, OH, Delaware County, OH, Fairfield County, OH, Fayette County, OH, Franklin County, OH, Greene County, OH, Guernsey County, OH, Hardin County, OH, Harrison County, OH, Hocking County, OH, Holmes County, OH, Jefferson County, OH, Knox County, OH, Licking County, OH, Logan County, OH, Madison County, OH, Marion County, OH, Miami County, OH, Monroe County, OH, Montgomery County, OH, Morgan County, OH, Morrow County, OH, Muskingum County, OH, Noble County, OH, Perry County, OH, Pickaway County, OH, Richland County, OH, Shelby County, OH, Stark County, OH, Tuscarawas County, OH, Union County, OH, Washington County, OH, Wayne County, OH, Wyandot County, OH, Allegheny County, PA, Armstrong County, PA, Beaver County, PA, Bedford County, PA, Blair County, PA, Butler County, PA, Cambria County, PA, Fayette County, PA, Fulton County, PA, Greene County, PA, Huntingdon County, PA, Indiana County, PA, Somerset County, PA, Washington County, PA, Westmoreland County, PA, Brooke County, WV, Hancock County, WV, Marshall County, WV, Monongalia County, WV, Ohio County, WV, Wetzel County, WV

The radar

The Cleveland radar (KCLE), 131 km from the middle of the area, began a volume at 18:06 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, 6.1 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-pSkew-T log-p diagram, Pittsburgh, PA at 12:00Z on 2011-07-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 587 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 2011-07-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -39 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
587 J/kg
Mixed-layer CIN
-44 J/kg
Mixed-layer LCL
1121 m above ground
0-6 km bulk shear
25 kt
0-1 km storm-relative helicity
-39 m²/s²
0-3 km storm-relative helicity
11 m²/s²
Significant tornado parameter
-0.1
Supercell composite
-0.6

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 29, 2:15 AM EDTSevere Thunderstorm WatchSPCFulton, Williams6 hr
Jul 29, 3:31 AM EDTMesoscale DiscussionSPCAshtabula, Fulton, Lake, Lucas, Ottawa, Williams89 min
Jul 29, 3:56 AM EDTSevere Thunderstorm WatchSPCAshtabula, Cuyahoga, Erie, Geauga, Lake, Lorain and 4 more5 hr
Jul 29, 4:51 PM EDTMesoscale DiscussionSPCButler, Darke, Miami, Montgomery, Preble84 min
Jul 29, 12:57 PM EDTMesoscale DiscussionSPCBerks, Bradford, Bucks, Carbon, Clinton, Columbia and 18 more2 hr
Jul 29, 2:40 PM EDTSevere Thunderstorm WatchSPCAdams, Bedford, Berks, Blair, Bradford, Bucks and 39 more8 hr
Jul 29, 4:40 PM EDTMesoscale DiscussionSPCAdams, Bedford, Berks, Blair, Bradford, Bucks and 43 more95 min
Jul 29, 5:03 PM EDTTornado WatchSPCLackawanna, Luzerne, Monroe, Pike, Wayne3 hr
Jul 29, 6:17 PM EDTMesoscale DiscussionSPCBerkeley, Hampshire, Jefferson, Marion, Mineral, Monongalia and 2 more88 min

Nearby

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