Alert archive / Ohio / Mesoscale Discussions in 2012

Mesoscale Discussion 1924

September 8, 20125 states

The Storm Prediction Center issued this mesoscale discussion at Sep 8, 2012, 12:57 AM EDT for 5 states. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Sep 8, 2012, 12:57 AM EDT (04:57 UTC)
Expired
Sep 8, 2012, 3:00 AM EDT
In force
2 hr
Issued by
the Storm Prediction Center
Chance of a watch
40%
All 123 counties

Anderson County, KY, Bath County, KY, Bourbon County, KY, Boyd County, KY, Bracken County, KY, Breathitt County, KY, Campbell County, KY, Carter County, KY, Clark County, KY, Elliott County, KY, Estill County, KY, Fayette County, KY, Fleming County, KY, Franklin County, KY, Garrard County, KY, Grant County, KY, Greenup County, KY, Harrison County, KY, Jackson County, KY, Jessamine County, KY, Johnson County, KY, Kenton County, KY, Lawrence County, KY, Lee County, KY, Lewis County, KY, Madison County, KY, Magoffin County, KY, Martin County, KY, Mason County, KY, Menifee County, KY, Mercer County, KY, Montgomery County, KY, Morgan County, KY, Nicholas County, KY, Owen County, KY, Owsley County, KY, Pendleton County, KY, Powell County, KY, Robertson County, KY, Rowan County, KY, Scott County, KY, Shelby County, KY, Spencer County, KY, Wolfe County, KY, Woodford County, KY, Chautauqua County, NY, Adams County, OH, Ashland County, OH, Ashtabula County, OH, Athens County, OH, Belmont County, OH, Brown County, OH, Carroll County, OH, Champaign County, OH, Clark County, OH, Clermont County, OH, Clinton County, OH, Columbiana County, OH, Coshocton County, OH, Crawford County, OH, Cuyahoga County, OH, Delaware County, OH, Fairfield County, OH, Fayette County, OH, Franklin County, OH, Gallia County, OH, Geauga County, OH, Greene County, OH, Guernsey County, OH, Harrison County, OH, Highland County, OH, Hocking County, OH, Holmes County, OH, Jackson County, OH, Jefferson County, OH, Knox County, OH, Lake County, OH, Lawrence County, OH, Licking County, OH, Madison County, OH, Mahoning County, OH, Marion County, OH, Medina County, OH, Meigs County, OH, Monroe County, OH, Morgan County, OH, Morrow County, OH, Muskingum County, OH, Noble County, OH, Perry County, OH, Pickaway County, OH, Pike County, OH, Portage County, OH, Richland County, OH, Ross County, OH, Scioto County, OH, Stark County, OH, Summit County, OH, Trumbull County, OH, Tuscarawas County, OH, Union County, OH, Vinton County, OH, Warren County, OH, Washington County, OH, Wayne County, OH, Beaver County, PA, Crawford County, PA, Erie County, PA, Lawrence County, PA, Mercer County, PA, Venango County, PA, Brooke County, WV, Cabell County, WV, Hancock County, WV, Jackson County, WV, Lincoln County, WV, Mason County, WV, Ohio County, WV, Pleasants County, WV, Putnam County, WV, Wayne County, WV, Wirt County, WV, Wood County, WV

The radar

The Cincinnati radar (KILN), 91 km from the middle of the area, began a volume at 04:57 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

Cncnati-Daytn, OH (KILN), launched 00:00Z, 5.0 hours before the alert went out and 89 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, Cncnati-Daytn, OH at 00:00Z on 2012-09-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 531 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, Cncnati-Daytn, OH at 00:00Z on 2012-09-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 20 square meters per square second.19395878Sfc1 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
531 J/kg
Mixed-layer CIN
-83 J/kg
Mixed-layer LCL
1512 m above ground
0-6 km bulk shear
32 kt
0-1 km storm-relative helicity
20 m²/s²
0-3 km storm-relative helicity
195 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.5

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
Sep 7, 8:39 PM EDTMesoscale DiscussionSPCAnderson, Boone, Bourbon, Bracken, Breckinridge, Bullitt and 25 more66 min
Sep 7, 9:10 PM EDTSevere Thunderstorm WatchSPCAdair, Allen, Anderson, Barren, Boone, Bourbon and 55 more6 hr
Sep 7, 9:24 PM EDTMesoscale DiscussionSPCBallard, Caldwell, Calloway, Carlisle, Christian, Crittenden and 15 more96 min
Sep 8, 12:36 AM EDTMesoscale DiscussionSPCAdair, Allen, Anderson, Barren, Bath, Boone and 59 more84 min
Sep 8, 8:42 AM EDTMesoscale DiscussionSPCBroome, Cayuga, Chemung, Chenango, Cortland, Herkimer and 13 more93 min
Sep 8, 10:03 AM EDTSevere Thunderstorm WatchSPCAllegany, Cattaraugus, Cayuga, Chemung, Franklin, Genesee and 16 more5 hr
Sep 8, 10:39 AM EDTMesoscale DiscussionSPCAlbany, Bronx, Columbia, Dutchess, Greene, Kings and 14 more2 hr
Sep 8, 11:18 AM EDTTornado WatchSPCBronx, Dutchess, Kings, Nassau, New York, Orange and 6 more10 hr
Sep 8, 11:38 AM EDTMesoscale DiscussionSPCAlbany, Broome, Chemung, Chenango, Cortland, Delaware and 18 more97 min
Sep 8, 12:40 PM EDTTornado WatchSPCAlbany, Broome, Chenango, Clinton, Columbia, Cortland and 22 more7 hr
Sep 8, 1:30 PM EDTMesoscale DiscussionSPCBronx, Dutchess, Kings, Nassau, New York, Putnam and 3 more60 min
Sep 8, 2:12 PM EDTMesoscale DiscussionSPCRichmond93 min
Sep 8, 2:46 PM EDTMesoscale DiscussionSPCAlbany, Clinton, Columbia, Delaware, Dutchess, Essex and 14 more59 min
Sep 8, 3:55 PM EDTMesoscale DiscussionSPCColumbia, Rensselaer, Washington65 min
Sep 8, 4:22 PM EDTMesoscale DiscussionSPCRichmond53 min
Sep 8, 6:17 PM EDTMesoscale DiscussionSPCSuffolk58 min
Sep 8, 5:00 AM EDTMesoscale DiscussionSPCAllegheny, Armstrong, Beaver, Bedford, Blair, Butler and 20 more60 min
Sep 8, 12:15 PM EDTSevere Thunderstorm WatchSPCAdams, Bedford, Berks, Blair, Bucks, Carbon and 29 more9 hr

Nearby

Mesoscale Discussions in Ohio, 2012Mesoscale Discussions in Kentucky, 2012Mesoscale Discussions in West Virginia, 2012Every mesoscale discussion in 2012

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.