Alert archive / Ohio / Mesoscale Discussions in 2003

Mesoscale Discussion 1934

July 21, 200311 counties in Kentucky; 35 counties in Ohio; Mason County, Wood County, West Virginia

The Storm Prediction Center issued this mesoscale discussion at Jul 21, 2003, 7:39 AM EDT for 11 counties in Kentucky; 35 counties in Ohio; Mason County, Wood County, West Virginia. It was in force for 96 min.

The area

The outline as issued.

The facts

Issued
Jul 21, 2003, 7:39 AM EDT (11:39 UTC)
Expired
Jul 21, 2003, 9:15 AM EDT
In force
96 min
Issued by
the Storm Prediction Center
All 48 counties

Boyd County, KY, Bracken County, KY, Carter County, KY, Fleming County, KY, Greenup County, KY, Harrison County, KY, Lewis County, KY, Mason County, KY, Nicholas County, KY, Robertson County, KY, Rowan County, KY, Adams County, OH, Athens County, OH, Brown County, OH, Carroll County, OH, Coshocton County, OH, Delaware County, OH, Fairfield County, OH, Fayette County, OH, Franklin County, OH, Gallia County, OH, Guernsey County, OH, Harrison County, OH, Highland County, OH, Hocking County, OH, Holmes County, OH, Jackson County, OH, Knox County, OH, Lawrence County, OH, Licking County, OH, Madison County, OH, Meigs County, OH, Morgan County, OH, Morrow County, OH, Muskingum County, OH, Noble County, OH, Perry County, OH, Pickaway County, OH, Pike County, OH, Ross County, OH, Scioto County, OH, Stark County, OH, Tuscarawas County, OH, Union County, OH, Vinton County, OH, Washington County, OH, Mason County, WV, Wood County, WV

The radar

The Cincinnati radar (KILN), 85 km from the middle of the area, began a volume at 11:39 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

Cncnati-Daytn, OH (KILN), launched 00:00Z, 11.7 hours before the alert went out and 83 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 2003-07-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 756 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 2003-07-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 74 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
756 J/kg
Mixed-layer CIN
-61 J/kg
Mixed-layer LCL
1300 m above ground
0-6 km bulk shear
34 kt
0-1 km storm-relative helicity
74 m²/s²
0-3 km storm-relative helicity
143 m²/s²
Significant tornado parameter
0.2
Supercell composite
3.9

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 21, 6:03 AM EDTMesoscale DiscussionSPCBoone, Campbell, Carroll, Gallatin, Grant, Henry and 5 more117 min
Jul 21, 6:10 AM EDTSevere Thunderstorm WatchSPCBoone, Bracken, Campbell, Carroll, Gallatin, Grant and 2 more6 hr
Jul 21, 8:03 AM EDTMesoscale DiscussionSPCAllen, Anderson, Barren, Breckinridge, Bullitt, Butler and 31 more117 min
Jul 21, 8:40 AM EDTSevere Thunderstorm WatchSPCBath, Boyd, Carter, Elliott, Greenup, Lawrence and 3 more5 hr
Jul 21, 11:27 AM EDTMesoscale DiscussionSPCBoone, Breckinridge, Bullitt, Butler, Caldwell, Carroll and 33 more2 hr
Jul 21, 12:55 PM EDTSevere Thunderstorm WatchSPCAdair, Allen, Barren, Boyle, Butler, Caldwell and 34 more6 hr
Jul 21, 2:41 PM EDTMesoscale DiscussionSPCBell, Floyd, Harlan, Knott, Leslie, Letcher and 3 more64 min
Jul 21, 4:14 PM EDTMesoscale DiscussionSPCAllen, Christian, Cumberland, Logan, Monroe, Muhlenberg and 3 more2 hr
Jul 21, 12:45 AM EDTSevere Thunderstorm WatchSPCDefiance, Paulding, Van Wert, Williams5 hr
Jul 21, 2:11 AM EDTMesoscale DiscussionSPCAllen, Ashland, Crawford, Cuyahoga, Erie, Geauga and 24 more2 hr
Jul 21, 4:26 PM EDTMesoscale DiscussionSPCDefiance, Fulton, Williams94 min

Nearby

Mesoscale Discussions in Ohio, 2003Mesoscale Discussions in Kentucky, 2003Mesoscale Discussions in West Virginia, 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.