Alert archive / Ohio / Mesoscale Discussions in 2003

Mesoscale Discussion 1882

July 18, 200332 counties in Ohio; 9 counties in Pennsylvania; 8 counties in West Virginia

The Storm Prediction Center issued this mesoscale discussion at Jul 18, 2003, 1:35 PM EDT for 32 counties in Ohio; 9 counties in Pennsylvania; 8 counties in West Virginia. It was in force for 115 min.

The area

The outline as issued.

The facts

Issued: Jul 18, 2003, 1:35 PM EDT (17:35 UTC)
Expired: Jul 18, 2003, 3:30 PM EDT
In force: 115 min
Issued by: the Storm Prediction Center

All 49 counties

Athens County, OH, Belmont County, OH, Carroll County, OH, Columbiana County, OH, Coshocton County, OH, Delaware County, OH, Fairfield County, OH, Fayette County, OH, Franklin County, OH, Guernsey County, OH, Harrison County, OH, Hocking County, OH, Holmes County, OH, Jackson County, OH, Jefferson County, OH, Knox County, OH, Licking County, OH, Madison County, OH, Meigs County, OH, Monroe County, OH, Morgan County, OH, Muskingum County, OH, Noble County, OH, Perry County, OH, Pickaway County, OH, Pike County, OH, Ross County, OH, Stark County, OH, Tuscarawas County, OH, Vinton County, OH, Washington County, OH, Wayne County, OH, Allegheny County, PA, Armstrong County, PA, Beaver County, PA, Butler County, PA, Fayette County, PA, Greene County, PA, Lawrence County, PA, Washington County, PA, Westmoreland County, PA, Brooke County, WV, Hancock County, WV, Marshall County, WV, Ohio County, WV, Pleasants County, WV, Tyler County, WV, Wetzel County, WV, Wood County, WV

The radar

The Pittsburgh radar (KPBZ), 150 km from the middle of the area, began a volume at 17:38 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.

Severe Thunderstorm Watch 759Jul 18, 1:55 PM EDT

The nearest sounding before it

Pittsburgh, PA (KPIT), launched 12:00Z, 5.6 hours before the alert went out and 154 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 270 J/kg
Mixed-layer CIN: -31 J/kg
Mixed-layer LCL: 1045 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 51 m²/s²
0-3 km storm-relative helicity: 86 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

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.

Issued	Product	Office	Counties	Lasted
Jul 18, 1:55 PM EDT	Severe Thunderstorm Watch	SPC	Athens, Belmont, Carroll, Columbiana, Coshocton, Delaware and 17 more	6 hr
Jul 18, 4:49 PM EDT	Mesoscale Discussion	SPC	Athens, Belmont, Carroll, Coshocton, Fairfield, Guernsey and 12 more	116 min
Jul 18, 6:47 PM EDT	Mesoscale Discussion	SPC	Athens, Belmont, Carroll, Coshocton, Delaware, Fairfield and 16 more	88 min

Nearby

Mesoscale Discussions in Ohio, 2003 Mesoscale Discussions in Pennsylvania, 2003 Mesoscale Discussions in West Virginia, 2003 Every 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.