Alert archive / Ohio / Mesoscale Discussions in 2004

Mesoscale Discussion 2050

August 19, 20044 states

The Storm Prediction Center issued this mesoscale discussion at Aug 19, 2004, 4:02 PM EST for 4 states. It was in force for 88 min.

The area

The outline as issued.

The facts

Issued
Aug 19, 2004, 4:02 PM EST (21:02 UTC)
Expired
Aug 19, 2004, 5:30 PM EST
In force
88 min
Issued by
the Storm Prediction Center
All 71 counties

Delaware County, IN, Fayette County, IN, Franklin County, IN, Henry County, IN, Randolph County, IN, Union County, IN, Wayne County, IN, Belmont County, OH, Butler County, OH, Carroll County, OH, Champaign County, OH, Clark County, OH, Columbiana County, OH, Coshocton County, OH, Darke County, OH, Delaware County, OH, Fairfield County, OH, Fayette County, OH, Franklin County, OH, Greene County, OH, Guernsey County, OH, Harrison County, OH, Holmes County, OH, Jefferson County, OH, Knox County, OH, Licking County, OH, Logan County, OH, Madison County, OH, Marion County, OH, Miami County, OH, Monroe County, OH, Montgomery County, OH, Morgan County, OH, Morrow County, OH, Muskingum County, OH, Noble County, OH, Perry County, OH, Pickaway County, OH, Preble County, OH, Shelby County, OH, Stark County, OH, Tuscarawas County, OH, Union County, OH, Warren County, OH, Wayne County, OH, Adams County, PA, Allegheny County, PA, Armstrong County, PA, Beaver County, PA, Bedford County, PA, Blair County, PA, Cambria County, PA, Cumberland County, PA, Dauphin County, PA, Fayette County, PA, Franklin County, PA, Fulton County, PA, Greene County, PA, Huntingdon County, PA, Indiana County, PA, Juniata County, PA, Mifflin County, PA, Perry County, PA, Somerset County, PA, Washington County, PA, Westmoreland County, PA, York County, PA, Brooke County, WV, Hancock County, WV, Marshall County, WV, Ohio County, WV

The radar

The Pittsburgh radar (KPBZ), 92 km from the middle of the area, began a volume at 21:03 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

Pittsburgh, PA (KPIT), launched 12:00Z, 9.0 hours before the alert went out and 95 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, Pittsburgh, PA at 12:00Z on 2004-08-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 21 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, Pittsburgh, PA at 12:00Z on 2004-08-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 104 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
21 J/kg
Mixed-layer CIN
-234 J/kg
Mixed-layer LCL
963 m above ground
0-6 km bulk shear
46 kt
0-1 km storm-relative helicity
104 m²/s²
0-3 km storm-relative helicity
150 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
Aug 18, 7:26 PM ESTMesoscale DiscussionSPCBartholomew, Benton, Boone, Brown, Clark, Clay and 29 more2 hr
Aug 19, 2:00 PM ESTSevere Thunderstorm WatchSPCFranklin, Randolph, Union, Wayne5 hr
Aug 19, 5:50 PM ESTMesoscale DiscussionSPCGibson, Pike, Posey, Vanderburgh, Warrick85 min
Aug 19, 12:41 PM ESTMesoscale DiscussionSPCBelmont, Butler, Carroll, Champaign, Clark, Clinton and 28 more64 min
Aug 19, 1:30 PM ESTSevere Thunderstorm WatchSPCBelmont, Carroll, Columbiana, Coshocton, Guernsey, Harrison and 4 more6 hr
Aug 19, 6:26 PM ESTMesoscale DiscussionSPCBelmont, Carroll, Clark, Coshocton, Fairfield, Franklin and 12 more64 min
Aug 19, 5:10 PM ESTSevere Thunderstorm WatchSPCAdams, Chester, Delaware, Lancaster, York4 hr

Nearby

Mesoscale Discussions in Ohio, 2004Mesoscale Discussions in Pennsylvania, 2004Mesoscale Discussions in Indiana, 2004Every mesoscale discussion in 2004

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.