Alert archive / Ohio / Mesoscale Discussions in 2003

Mesoscale Discussion 2420

September 27, 20034 states

The Storm Prediction Center issued this mesoscale discussion at Sep 27, 2003, 5:15 AM EDT for 4 states. It was in force for 60 min.

The area

The outline as issued.

The facts

Issued
Sep 27, 2003, 5:15 AM EDT (09:15 UTC)
Expired
Sep 27, 2003, 6:15 AM EDT
In force
60 min
Issued by
the Storm Prediction Center
All 57 counties

Bath County, KY, Bourbon County, KY, Carter County, KY, Clark County, KY, Elliott County, KY, Estill County, KY, Fayette County, KY, Fleming County, KY, Greenup County, KY, Jessamine County, KY, Lewis County, KY, Madison County, KY, Mason County, KY, Menifee County, KY, Mercer County, KY, Montgomery County, KY, Morgan County, KY, Nicholas County, KY, Powell County, KY, Robertson County, KY, Rowan County, KY, Washington County, KY, Wolfe County, KY, Woodford County, KY, Adams County, OH, Athens County, OH, Belmont County, OH, Carroll County, OH, Columbiana County, OH, Coshocton County, OH, Gallia County, OH, Guernsey County, OH, Harrison County, OH, Hocking County, OH, Jackson County, OH, Jefferson County, OH, Lawrence County, OH, Mahoning County, OH, Meigs County, OH, Morgan County, OH, Muskingum County, OH, Noble County, OH, Perry County, OH, Pike County, OH, Ross County, OH, Scioto County, OH, Stark County, OH, Trumbull County, OH, Tuscarawas County, OH, Vinton County, OH, Beaver County, PA, Crawford County, PA, Lawrence County, PA, Mercer County, PA, Venango County, PA, Warren County, PA, Hancock County, WV

The radar

The Cincinnati radar (KILN), 94 km from the middle of the area, began a volume at 09:18 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, 9.3 hours before the alert went out and 92 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 2003-09-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 780 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 2003-09-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 368 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
780 J/kg
Mixed-layer CIN
-21 J/kg
Mixed-layer LCL
699 m above ground
0-6 km bulk shear
51 kt
0-1 km storm-relative helicity
368 m²/s²
0-3 km storm-relative helicity
432 m²/s²
Significant tornado parameter
0.0
Supercell composite
8.5

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 26, 8:56 PM EDTMesoscale DiscussionSPCBoone, Henderson94 min
Sep 26, 9:20 PM EDTTornado WatchSPCBoone, Campbell, Carroll, Gallatin, Henderson, Kenton and 3 more6 hr
Sep 27, 12:06 AM EDTMesoscale DiscussionSPCBoone, Campbell, Carroll, Gallatin, Grant, Henderson and 6 more84 min
Sep 27, 12:40 AM EDTTornado WatchSPCAnderson, Bath, Boone, Bourbon, Bracken, Bullitt and 35 more5 hr
Sep 27, 3:12 AM EDTMesoscale DiscussionSPCAdair, Allen, Barren, Butler, Calloway, Casey and 21 more93 min
Sep 27, 3:37 AM EDTMesoscale DiscussionSPCAnderson, Bath, Bourbon, Bracken, Bullitt, Campbell and 36 more113 min
Sep 27, 11:42 AM EDTMesoscale DiscussionSPCBell, Harlan, Knox, Leslie, Letcher108 min
Sep 27, 2:35 AM EDTTornado WatchSPCErie5 hr
Sep 27, 2:22 PM EDTMesoscale DiscussionSPCAdams, Bedford, Bradford, Centre, Clinton, Columbia and 16 more113 min
Sep 27, 4:05 PM EDTSevere Thunderstorm WatchSPCBedford, Blair, Cambria, Cameron, Centre, Clearfield and 11 more5 hr
Sep 27, 6:52 PM EDTMesoscale DiscussionSPCBedford, Blair, Centre, Clinton, Franklin, Fulton and 5 more53 min
Sep 27, 2:41 PM EDTMesoscale DiscussionSPCMonroe2 hr

Nearby

Mesoscale Discussions in Ohio, 2003Mesoscale Discussions in Kentucky, 2003Mesoscale Discussions in Pennsylvania, 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.