Alert archive / Pennsylvania / Mesoscale Discussions in 2004

Mesoscale Discussion 859

May 24, 2004Trumbull County, Ohio; 16 counties in Pennsylvania; 4 counties in West Virginia

The Storm Prediction Center issued this mesoscale discussion at May 24, 2004, 4:55 AM EDT for Trumbull County, Ohio; 16 counties in Pennsylvania; 4 counties in West Virginia. It was in force for 95 min.

The area

The outline as issued.

The facts

Issued
May 24, 2004, 4:55 AM EDT (08:55 UTC)
Expired
May 24, 2004, 6:30 AM EDT
In force
95 min
Issued by
the Storm Prediction Center
All 21 counties

Trumbull County, OH, Allegheny County, PA, Armstrong County, PA, Beaver County, PA, Butler County, PA, Clarion County, PA, Crawford County, PA, Fayette County, PA, Forest County, PA, Greene County, PA, Indiana County, PA, Lawrence County, PA, Mercer County, PA, Venango County, PA, Warren County, PA, Washington County, PA, Westmoreland County, PA, Brooke County, WV, Hancock County, WV, Marshall County, WV, Ohio County, WV

The radar

The Pittsburgh radar (KPBZ), 26 km from the middle of the area, began a volume at 08:58 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

Pittsburgh, PA (KPIT), launched 00:00Z, 8.9 hours before the alert went out and 40 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 00:00Z on 2004-05-24Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1100 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 00:00Z on 2004-05-24The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 111 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
1100 J/kg
Mixed-layer CIN
-22 J/kg
Mixed-layer LCL
1452 m above ground
0-6 km bulk shear
17 kt
0-1 km storm-relative helicity
111 m²/s²
0-3 km storm-relative helicity
288 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
May 23, 9:40 PM EDTMesoscale DiscussionSPCDefiance, Fulton, Henry, Lucas, Ottawa, Paulding and 2 more65 min
May 23, 10:50 PM EDTSevere Thunderstorm WatchSPCAllen, Auglaize, Butler, Darke, Defiance, Fulton and 10 more6 hr
May 24, 12:26 AM EDTMesoscale DiscussionSPCAllen, Auglaize, Butler, Darke, Defiance, Fulton and 11 more64 min
May 24, 12:30 AM EDTSevere Thunderstorm WatchSPCAshland, Belmont, Carroll, Champaign, Clark, Clinton and 47 more6 hr
May 24, 2:09 AM EDTMesoscale DiscussionSPCAllen, Auglaize, Belmont, Butler, Carroll, Clinton and 37 more2 hr
May 24, 10:03 AM EDTMesoscale DiscussionSPCBedford, Berks, Blair, Bradford, Bucks, Carbon and 31 more117 min
May 24, 11:00 AM EDTSevere Thunderstorm WatchSPCCarbon, Columbia, Lackawanna, Lehigh, Luzerne, Monroe and 5 more5 hr
May 24, 12:24 PM EDTMesoscale DiscussionSPCBlair, Bradford, Cambria, Cameron, Centre, Clearfield and 12 more2 hr
May 24, 12:40 PM EDTSevere Thunderstorm WatchSPCAllegheny, Armstrong, Beaver, Blair, Bradford, Butler and 23 more4 hr
May 24, 3:00 PM EDTMesoscale DiscussionSPCBerks, Bucks, Carbon, Columbia, Lackawanna, Lehigh and 11 more90 min
May 24, 4:55 PM EDTSevere Thunderstorm WatchSPCAdams, Berks, Bradford, Bucks, Carbon, Chester and 28 more4 hr
May 24, 5:43 PM EDTMesoscale DiscussionSPCAdams, Berks, Bradford, Bucks, Carbon, Chester and 27 more47 min
May 24, 7:25 PM EDTMesoscale DiscussionSPCBerks, Bradford, Bucks, Carbon, Chester, Columbia and 24 more95 min

Nearby

Mesoscale Discussions in Pennsylvania, 2004Mesoscale Discussions in West Virginia, 2004Mesoscale Discussions in Ohio, 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.