Alert archive / Ohio / Mesoscale Discussions in 2007

Mesoscale Discussion 1549

July 19, 2007Chautauqua County, New York; 37 counties in Ohio; 4 counties in Pennsylvania

The Storm Prediction Center issued this mesoscale discussion at Jul 19, 2007, 7:15 PM EDT for Chautauqua County, New York; 37 counties in Ohio; 4 counties in Pennsylvania. It was in force for 90 min.

The area

The outline as issued.

The facts

Issued
Jul 19, 2007, 7:15 PM EDT (23:15 UTC)
Expired
Jul 19, 2007, 8:45 PM EDT
In force
90 min
Issued by
the Storm Prediction Center
All 42 counties

Chautauqua County, NY, Allen County, OH, Ashland County, OH, Ashtabula County, OH, Auglaize County, OH, Carroll County, OH, Champaign County, OH, Columbiana County, OH, Coshocton County, OH, Crawford County, OH, Cuyahoga County, OH, Delaware County, OH, Franklin County, OH, Geauga County, OH, Guernsey County, OH, Hancock County, OH, Hardin County, OH, Harrison County, OH, Holmes County, OH, Huron County, OH, Knox County, OH, Licking County, OH, Logan County, OH, Mahoning County, OH, Marion County, OH, Medina County, OH, Morrow County, OH, Muskingum County, OH, Portage County, OH, Richland County, OH, Seneca County, OH, Stark County, OH, Summit County, OH, Trumbull County, OH, Tuscarawas County, OH, Union County, OH, Wayne County, OH, Wyandot County, OH, Crawford County, PA, Erie County, PA, Lawrence County, PA, Mercer County, PA

The radar

The Cleveland radar (KCLE), 26 km from the middle of the area, began a volume at 23:17 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 12:00Z, 11.3 hours before the alert went out and 162 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 2007-07-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 61 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 2007-07-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 163 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
61 J/kg
Mixed-layer CIN
-126 J/kg
Mixed-layer LCL
828 m above ground
0-6 km bulk shear
45 kt
0-1 km storm-relative helicity
163 m²/s²
0-3 km storm-relative helicity
232 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.1

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.

IssuedProductOfficeCountiesLasted
Jul 19, 2:07 PM EDTSevere Thunderstorm WatchSPCBronx, Kings, New York, Queens, Richmond8 hr
Jul 19, 2:13 PM EDTMesoscale DiscussionSPCDutchess, Nassau, Putnam, Rockland, Westchester62 min
Jul 19, 3:09 PM EDTSevere Thunderstorm WatchSPCPutnam, Rockland, Westchester4 hr
Jul 19, 4:32 PM EDTMesoscale DiscussionSPCAllegany, Cattaraugus, Cayuga, Chautauqua, Erie, Genesee and 10 more88 min
Jul 19, 6:27 PM EDTMesoscale DiscussionSPCKings, New York, Richmond93 min
Jul 18, 10:06 PM EDTMesoscale DiscussionSPCAllen, Auglaize, Butler, Champaign, Clark, Clinton and 37 more84 min
Jul 18, 10:59 PM EDTSevere Thunderstorm WatchSPCAllen, Ashland, Ashtabula, Auglaize, Belmont, Carroll and 56 more6 hr
Jul 19, 10:09 AM EDTMesoscale DiscussionSPCGallia, Lawrence, Meigs96 min
Jul 19, 12:45 PM EDTMesoscale DiscussionSPCAdams, Brown, Butler, Clermont, Clinton, Gallia and 9 more60 min
Jul 19, 1:07 PM EDTSevere Thunderstorm WatchSPCAdams, Brown, Butler, Clermont, Clinton, Gallia and 10 more8 hr
Jul 19, 3:54 PM EDTMesoscale DiscussionSPCCrawford, Erie, Fulton, Hancock, Henry, Huron and 7 more96 min

Nearby

Mesoscale Discussions in Ohio, 2007Mesoscale Discussions in Pennsylvania, 2007Mesoscale Discussions in New York, 2007Every mesoscale discussion in 2007

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.