Alert archive / Ohio / Mesoscale Discussions in 2003

Mesoscale Discussion 2489

November 12, 200311 counties in Indiana; 20 counties in Michigan; 23 counties in Ohio

The Storm Prediction Center issued this mesoscale discussion at Nov 12, 2003, 12:45 PM EST for 11 counties in Indiana; 20 counties in Michigan; 23 counties in Ohio. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued
Nov 12, 2003, 12:45 PM EST (17:45 UTC)
Expired
Nov 12, 2003, 3:15 PM EST
In force
3 hr
Issued by
the Storm Prediction Center
All 54 counties

Adams County, IN, Allen County, IN, DeKalb County, IN, Huntington County, IN, Kosciusko County, IN, LaGrange County, IN, Noble County, IN, Steuben County, IN, Wabash County, IN, Wells County, IN, Whitley County, IN, Branch County, MI, Calhoun County, MI, Eaton County, MI, Genesee County, MI, Hillsdale County, MI, Ingham County, MI, Jackson County, MI, Lapeer County, MI, Lenawee County, MI, Livingston County, MI, Macomb County, MI, Monroe County, MI, Oakland County, MI, Saint Clair County, MI, Saint Joseph County, MI, Sanilac County, MI, Shiawassee County, MI, Tuscola County, MI, Washtenaw County, MI, Wayne County, MI, Allen County, OH, Crawford County, OH, Cuyahoga County, OH, Defiance County, OH, Erie County, OH, Fulton County, OH, Hancock County, OH, Henry County, OH, Huron County, OH, Lake County, OH, Lorain County, OH, Lucas County, OH, Medina County, OH, Ottawa County, OH, Paulding County, OH, Putnam County, OH, Sandusky County, OH, Seneca County, OH, Summit County, OH, Van Wert County, OH, Williams County, OH, Wood County, OH, Wyandot County, OH

The radar

The Detroit radar (KDTX), 75 km from the middle of the area, began a volume at 17:47 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

Detroit, MI (KDTX), launched 12:00Z, 5.8 hours before the alert went out and 78 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, Detroit, MI at 12:00Z on 2003-11-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Detroit, MI at 12:00Z on 2003-11-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 85 square meters per square second.1939587897117Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1748 m above ground
0-6 km bulk shear
70 kt
0-1 km storm-relative helicity
85 m²/s²
0-3 km storm-relative helicity
182 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.

IssuedProductOfficeCountiesLasted
Nov 12, 2:36 PM ESTMesoscale DiscussionSPCBartholomew, Brown, Clark, Crawford, Dearborn, Decatur and 20 more2 hr
Nov 12, 3:20 PM ESTTornado WatchSPCAdams, Dearborn, Fayette, Franklin, Jay, Randolph and 3 more6 hr
Nov 12, 3:26 PM ESTMesoscale DiscussionSPCAdams, Allen, Blackford, DeKalb, Delaware, Jay and 2 more2 hr
Nov 12, 6:13 PM ESTMesoscale DiscussionSPCAdams, Dearborn, Fayette, Franklin, Jay, Randolph and 3 more2 hr
Nov 12, 1:50 PM ESTSevere Thunderstorm WatchSPCHillsdale, Ingham, Jackson, Lenawee, Livingston, Macomb and 4 more5 hr
Nov 12, 4:40 PM ESTTornado WatchSPCMonroe, Washtenaw5 hr

Nearby

Mesoscale Discussions in Ohio, 2003Mesoscale Discussions in Michigan, 2003Mesoscale Discussions in Indiana, 2003Every mesoscale discussion in 2003

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.