Alert archive / Pennsylvania / Mesoscale Discussions in 2004
Mesoscale Discussion 863
The Storm Prediction Center issued this mesoscale discussion at May 24, 2004, 12:24 PM EDT for 12 counties in New York; 18 counties in Pennsylvania. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- May 24, 2004, 12:24 PM EDT (16:24 UTC)
- Expired
- May 24, 2004, 2:30 PM EDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
All 30 counties
Allegany County, NY, Broome County, NY, Chemung County, NY, Chenango County, NY, Cortland County, NY, Ontario County, NY, Schuyler County, NY, Seneca County, NY, Steuben County, NY, Tioga County, NY, Tompkins County, NY, Yates County, NY, Blair County, PA, Bradford County, PA, Cambria County, PA, Cameron County, PA, Centre County, PA, Clearfield County, PA, Clinton County, PA, Columbia County, PA, Juniata County, PA, Lycoming County, PA, Mifflin County, PA, Montour County, PA, Northumberland County, PA, Potter County, PA, Snyder County, PA, Sullivan County, PA, Tioga County, PA, Union County, PA
The radar
The State College radar (KCCX), 99 km from the middle of the area, began a volume at 16:24 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, 4.4 hours before the alert went out and 167 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.
- Mixed-layer CAPE
- 20 J/kg
- Mixed-layer CIN
- -121 J/kg
- Mixed-layer LCL
- 867 m above ground
- 0-6 km bulk shear
- 31 kt
- 0-1 km storm-relative helicity
- -59 m²/s²
- 0-3 km storm-relative helicity
- -30 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
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</html>SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 23, 11:02 PM EDT | Mesoscale Discussion | SPC | Cayuga, Essex, Fulton, Hamilton, Herkimer, Lewis and 8 more | 3 hr |
| May 24, 10:03 AM EDT | Mesoscale Discussion | SPC | Albany, Broome, Chemung, Chenango, Columbia, Cortland and 18 more | 117 min |
| May 24, 11:00 AM EDT | Severe Thunderstorm Watch | SPC | Albany, Bronx, Columbia, Delaware, Dutchess, Greene and 10 more | 5 hr |
| May 24, 12:40 PM EDT | Severe Thunderstorm Watch | SPC | Allegany, Broome, Cattaraugus, Chemung, Chenango, Cortland and 11 more | 4 hr |
| May 24, 3:00 PM EDT | Mesoscale Discussion | SPC | Albany, Broome, Chenango, Cortland, Delaware, Fulton and 16 more | 90 min |
| May 24, 4:55 PM EDT | Severe Thunderstorm Watch | SPC | Albany, Broome, Chenango, Columbia, Cortland, Delaware and 23 more | 4 hr |
| May 24, 5:43 PM EDT | Mesoscale Discussion | SPC | Albany, Broome, Chenango, Columbia, Cortland, Delaware and 24 more | 47 min |
| May 24, 5:45 PM EDT | Severe Thunderstorm Watch | SPC | Rensselaer | 5 hr |
| May 24, 7:25 PM EDT | Mesoscale Discussion | SPC | Albany, Broome, Chenango, Columbia, Cortland, Delaware and 24 more | 95 min |
| May 24, 12:30 AM EDT | Severe Thunderstorm Watch | SPC | Allegheny, Armstrong, Beaver, Butler, Clarion, Crawford and 10 more | 6 hr |
| May 24, 2:09 AM EDT | Mesoscale Discussion | SPC | Greene, Washington | 2 hr |
| May 24, 4:55 AM EDT | Mesoscale Discussion | SPC | Allegheny, Armstrong, Beaver, Butler, Clarion, Crawford and 10 more | 95 min |
Nearby
Mesoscale Discussions in Pennsylvania, 2004Mesoscale Discussions in New York, 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.