Alert archive / Ohio / Mesoscale Discussions in 2003

Mesoscale Discussion 1930

July 21, 200330 counties in Ohio

The Storm Prediction Center issued this mesoscale discussion at Jul 21, 2003, 2:11 AM EDT for 30 counties in Ohio. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Jul 21, 2003, 2:11 AM EDT (06:11 UTC)
Expired
Jul 21, 2003, 4:15 AM EDT
In force
2 hr
Issued by
the Storm Prediction Center
All 30 counties

Allen County, OH, Ashland County, OH, Crawford County, OH, Cuyahoga County, OH, Erie County, OH, Geauga County, OH, Hancock County, OH, Hardin County, OH, Henry County, OH, Holmes County, OH, Huron County, OH, Lake County, OH, Lorain County, OH, Lucas County, OH, Marion County, OH, Medina County, OH, Morrow County, OH, Ottawa County, OH, Portage County, OH, Putnam County, OH, Richland County, OH, Sandusky County, OH, Seneca County, OH, Stark County, OH, Summit County, OH, Trumbull County, OH, Van Wert County, OH, Wayne County, OH, Wood County, OH, Wyandot County, OH

The radar

The Cleveland radar (KCLE), 81 km from the middle of the area, began a volume at 06:12 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 00:00Z, 6.2 hours before the alert went out and 165 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 00:00Z on 2003-07-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1227 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, Detroit, MI at 00:00Z on 2003-07-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 142 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
1227 J/kg
Mixed-layer CIN
-2 J/kg
Mixed-layer LCL
788 m above ground
0-6 km bulk shear
44 kt
0-1 km storm-relative helicity
142 m²/s²
0-3 km storm-relative helicity
156 m²/s²
Significant tornado parameter
0.8
Supercell composite
4.7

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, 12:45 AM EDTSevere Thunderstorm WatchSPCDefiance, Paulding, Van Wert, Williams5 hr
Jul 21, 6:03 AM EDTMesoscale DiscussionSPCButler, Clermont, Clinton, Greene, Hamilton, Montgomery and 2 more117 min
Jul 21, 6:10 AM EDTSevere Thunderstorm WatchSPCAdams, Allen, Auglaize, Brown, Butler, Champaign and 30 more6 hr
Jul 21, 7:39 AM EDTMesoscale DiscussionSPCAdams, Athens, Brown, Carroll, Coshocton, Delaware and 29 more96 min
Jul 21, 8:40 AM EDTSevere Thunderstorm WatchSPCAthens, Belmont, Carroll, Columbiana, Gallia, Guernsey and 17 more5 hr
Jul 21, 11:27 AM EDTMesoscale DiscussionSPCButler, Darke, Hamilton, Montgomery, Preble2 hr
Jul 21, 4:26 PM EDTMesoscale DiscussionSPCDefiance, Fulton, Williams94 min

Nearby

Mesoscale Discussions in Ohio, 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.