Alert archive / New York / Mesoscale Discussions in 2003

Mesoscale Discussion 662

May 1, 200326 counties in New York; 4 counties in Ohio; 22 counties in Pennsylvania

The Storm Prediction Center issued this mesoscale discussion at May 1, 2003, 12:41 PM EDT for 26 counties in New York; 4 counties in Ohio; 22 counties in Pennsylvania. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued
May 1, 2003, 12:41 PM EDT (16:41 UTC)
Expired
May 1, 2003, 3:15 PM EDT
In force
3 hr
Issued by
the Storm Prediction Center
All 52 counties

Allegany County, NY, Broome County, NY, Cattaraugus County, NY, Cayuga County, NY, Chautauqua County, NY, Chemung County, NY, Chenango County, NY, Cortland County, NY, Erie County, NY, Genesee County, NY, Herkimer County, NY, Lewis County, NY, Livingston County, NY, Madison County, NY, Oneida County, NY, Onondaga County, NY, Ontario County, NY, Oswego County, NY, Schuyler County, NY, Seneca County, NY, Steuben County, NY, Tioga County, NY, Tompkins County, NY, Wayne County, NY, Wyoming County, NY, Yates County, NY, Columbiana County, OH, Mahoning County, OH, Portage County, OH, Trumbull County, OH, Allegheny County, PA, Armstrong County, PA, Beaver County, PA, Bradford County, PA, Butler County, PA, Cameron County, PA, Clarion County, PA, Clearfield County, PA, Clinton County, PA, Crawford County, PA, Elk County, PA, Forest County, PA, Indiana County, PA, Jefferson County, PA, Lawrence County, PA, Lycoming County, PA, McKean County, PA, Mercer County, PA, Potter County, PA, Tioga County, PA, Venango County, PA, Warren County, PA

The radar

The Buffalo radar (KBUF), 105 km from the middle of the area, began a volume at 16:40 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

Buffalo Intl Airport, NY (KBUF), launched 12:00Z, 4.7 hours before the alert went out and 102 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, Buffalo Intl Airport, NY at 12:00Z on 2003-05-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Buffalo Intl Airport, NY at 12:00Z on 2003-05-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 80 square meters per square second.19395878Sfc1 km3 km6 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
1 J/kg
Mixed-layer CIN
-89 J/kg
Mixed-layer LCL
790 m above ground
0-6 km bulk shear
51 kt
0-1 km storm-relative helicity
80 m²/s²
0-3 km storm-relative helicity
83 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 1, 1:30 PM EDTSevere Thunderstorm WatchSPCAllegany, Cattaraugus, Cayuga, Chautauqua, Chemung, Chenango and 24 more6 hr
May 1, 4:10 PM EDTMesoscale DiscussionSPCAllegany, Cattaraugus, Cayuga, Chemung, Chenango, Cortland and 14 more95 min
May 1, 4:25 PM EDTSevere Thunderstorm WatchSPCClinton, Essex, Franklin, Rensselaer, Saratoga, Schenectady and 2 more5 hr
Apr 30, 9:48 PM EDTMesoscale DiscussionSPCAllen, Ashland, Auglaize, Crawford, Cuyahoga, Defiance and 25 more87 min
May 1, 1:09 PM EDTMesoscale DiscussionSPCAllen, Ashland, Auglaize, Champaign, Crawford, Darke and 24 more3 hr
May 1, 1:50 PM EDTSevere Thunderstorm WatchSPCAllen, Ashland, Ashtabula, Auglaize, Belmont, Butler and 56 more5 hr
May 1, 3:35 PM EDTSevere Thunderstorm WatchSPCAdams, Brown, Clermont, Highland, Jackson, Pike and 2 more5 hr
May 1, 6:11 PM EDTMesoscale DiscussionSPCAdams, Brown, Clermont, Hamilton, Highland, Jackson and 4 more94 min
May 1, 6:55 PM EDTSevere Thunderstorm WatchSPCAshland, Auglaize, Butler, Champaign, Clark, Clinton and 24 more4 hr
May 1, 7:10 PM EDTMesoscale DiscussionSPCAdams, Brown, Clermont, Hamilton, Highland, Jackson and 4 more95 min
May 1, 6:02 PM EDTMesoscale DiscussionSPCAdams, Bedford, Berks, Blair, Cumberland, Dauphin and 13 more3 hr

Nearby

Mesoscale Discussions in New York, 2003Mesoscale Discussions in Pennsylvania, 2003Mesoscale 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.