Alert archive / New York / Severe Thunderstorm Watches in 2004
Severe Thunderstorm Watch 217
The Storm Prediction Center issued this severe thunderstorm watch at May 18, 2004, 1:50 PM EDT for 45 counties in New York; 8 counties in Pennsylvania. It was in force for 8 hr.
The area
The outline as issued.
The facts
- Issued
- May 18, 2004, 1:50 PM EDT (17:50 UTC)
- Expired
- May 18, 2004, 10:00 PM EDT
- In force
- 8 hr
- Issued by
- the Storm Prediction Center
All 53 counties
Albany County, NY, Allegany County, NY, Broome County, NY, Cattaraugus County, NY, Cayuga County, NY, Chemung County, NY, Chenango County, NY, Columbia County, NY, Cortland County, NY, Delaware County, NY, Erie County, NY, Essex County, NY, Fulton County, NY, Genesee County, NY, Greene County, NY, Hamilton County, NY, Herkimer County, NY, Jefferson County, NY, Lewis County, NY, Livingston County, NY, Madison County, NY, Monroe County, NY, Montgomery County, NY, Niagara County, NY, Oneida County, NY, Onondaga County, NY, Ontario County, NY, Orleans County, NY, Oswego County, NY, Otsego County, NY, Rensselaer County, NY, Saratoga County, NY, Schenectady County, NY, Schoharie County, NY, Schuyler County, NY, Seneca County, NY, Steuben County, NY, Tioga County, NY, Tompkins County, NY, Ulster County, NY, Warren County, NY, Washington County, NY, Wayne County, NY, Wyoming County, NY, Yates County, NY, Bradford County, PA, Cameron County, PA, Elk County, PA, Jefferson County, PA, McKean County, PA, Potter County, PA, Susquehanna County, PA, Tioga County, PA
The radar
The Binghamton radar (KBGM), 112 km from the middle of the area, began a volume at 17:51 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.
Warnings issued inside it
3 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 18, 5:34 PM EDT | Severe Thunderstorm Warning | ALY | Washington | 26 min |
| May 18, 5:56 PM EDT | Severe Thunderstorm Warning | ALY | Washington | 34 min |
| May 18, 7:17 PM EDT | Flash Flood Warning | PBZ | Jefferson | 3 hr |
Discussions around it
SPC mesoscale discussions over the same counties from four hours before the watch to its end.
The nearest sounding before it
Buffalo Intl Airport, NY (KBUF), launched 12:00Z, 5.8 hours before the alert went out and 159 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
- 369 J/kg
- Mixed-layer CIN
- -16 J/kg
- Mixed-layer LCL
- 658 m above ground
- 0-6 km bulk shear
- 34 kt
- 0-1 km storm-relative helicity
- 220 m²/s²
- 0-3 km storm-relative helicity
- 247 m²/s²
- Significant tornado parameter
- 0.3
- Supercell composite
- 2.3
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 18, 12:54 PM EDT | Mesoscale Discussion | SPC | Cattaraugus | 66 min |
| May 18, 1:04 PM EDT | Mesoscale Discussion | SPC | Albany, Broome, Cayuga, Chemung, Chenango, Clinton and 28 more | 56 min |
| May 18, 2:54 PM EDT | Mesoscale Discussion | SPC | Bronx, Dutchess, Kings, New York, Orange, Putnam and 3 more | 96 min |
| May 18, 4:38 PM EDT | Mesoscale Discussion | SPC | Albany, Chenango, Cortland, Fulton, Greene, Madison and 7 more | 2 hr |
| May 18, 6:24 PM EDT | Mesoscale Discussion | SPC | Albany, Broome, Cayuga, Chemung, Chenango, Columbia and 22 more | 2 hr |
| May 18, 1:45 PM EDT | Severe Thunderstorm Watch | SPC | Allegheny, Armstrong, Beaver, Butler, Clarion, Fayette and 6 more | 6 hr |
| May 18, 7:09 PM EDT | Mesoscale Discussion | SPC | Allegheny, Armstrong, Beaver, Butler, Fayette, Greene and 3 more | 96 min |
| May 18, 7:49 PM EDT | Mesoscale Discussion | SPC | Chester, Delaware, Lancaster, Montgomery, Philadelphia, York | 2 hr |
Nearby
Severe Thunderstorm Watches in New York, 2004Severe Thunderstorm Watches in Pennsylvania, 2004Every severe thunderstorm watch 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.