Alert archive / New York / Severe Thunderstorm Watches in 2011
Severe Thunderstorm Watch 835
The Storm Prediction Center issued this severe thunderstorm watch at Sep 4, 2011, 2:43 PM EDT for 36 counties in New York; 15 counties in Pennsylvania; 14 counties in Vermont. It was in force for 8 hr.
The area
The outline as issued.
The facts
- Issued
- Sep 4, 2011, 2:43 PM EDT (18:43 UTC)
- Expired
- Sep 4, 2011, 10:28 PM EDT
- In force
- 8 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1.5 in
- Strongest gust expected
- 60 kt
All 65 counties
Albany County, NY, Broome County, NY, Cayuga County, NY, Chemung County, NY, Chenango County, NY, Clinton County, NY, Cortland County, NY, Delaware County, NY, Essex County, NY, Franklin County, NY, Fulton County, NY, Greene County, NY, Hamilton County, NY, Herkimer County, NY, Lewis County, NY, Madison County, NY, Montgomery County, NY, Oneida County, NY, Onondaga 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, St. Lawrence County, NY, Steuben County, NY, Sullivan County, NY, Tioga County, NY, Tompkins County, NY, Ulster County, NY, Warren County, NY, Washington County, NY, Yates County, NY, Bradford County, PA, Clinton County, PA, Columbia County, PA, Lackawanna County, PA, Luzerne County, PA, Lycoming County, PA, Montour County, PA, Northumberland County, PA, Pike County, PA, Sullivan County, PA, Susquehanna County, PA, Tioga County, PA, Union County, PA, Wayne County, PA, Wyoming County, PA, Addison County, VT, Bennington County, VT, Caledonia County, VT, Chittenden County, VT, Essex County, VT, Franklin County, VT, Grand Isle County, VT, Lamoille County, VT, Orange County, VT, Orleans County, VT, Rutland County, VT, Washington County, VT, Windham County, VT, Windsor County, VT
The radar
The Ft Drum radar (KTYX), 92 km from the middle of the area, began a volume at 18:45 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.
What SPC expected
The probabilities SPC published with the watch, for the watch area over its life.
- Two or more tornadoes
- 20%
- One or more EF2 to EF5 tornadoes
- 2%
- Ten or more severe wind reports
- 60%
- One or more gusts of 65 knots or more
- 30%
- Ten or more severe hail reports
- 50%
- One or more hailstones of 2 inches or more
- 20%
- Six or more combined severe hail and wind reports
- 80%
Warnings issued inside it
21 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 4, 2:43 PM EDT | Severe Thunderstorm Warning | BTV | Essex | 44 min |
| Sep 4, 3:06 PM EDT | Severe Thunderstorm Warning | BGM | Broome, Tioga | 39 min |
| Sep 4, 3:08 PM EDT | Severe Thunderstorm Warning | ALY | Fulton, Hamilton, Herkimer | 67 min |
| Sep 4, 3:12 PM EDT | Severe Thunderstorm Warning | BGM | Luzerne | 48 min |
| Sep 4, 3:24 PM EDT | Severe Thunderstorm Warning | CTP | Lycoming, Sullivan | 66 min |
| Sep 4, 3:40 PM EDT | Severe Thunderstorm Warning | BGM | Broome | 50 min |
| Sep 4, 3:40 PM EDT | Severe Thunderstorm Warning | BTV | Chittenden, Franklin, Lamoille, Orleans, Washington | 65 min |
| Sep 4, 4:10 PM EDT | Severe Thunderstorm Warning | BGM | Otsego | 50 min |
| Sep 4, 4:20 PM EDT | Severe Thunderstorm Warning | BGM | Broome, Chenango, Delaware | 55 min |
| Sep 4, 4:38 PM EDT | Severe Thunderstorm Warning | ALY | Fulton, Montgomery, Saratoga, Schenectady | 67 min |
| Sep 4, 4:49 PM EDT | Severe Thunderstorm Warning | BGM | Chenango, Otsego | 35 min |
| Sep 4, 4:52 PM EDT | Severe Thunderstorm Warning | BGM | Chenango, Cortland, Madison, Oneida, Otsego | 47 min |
| Sep 4, 5:16 PM EDT | Severe Thunderstorm Warning | BGM | Delaware | 59 min |
| Sep 4, 5:26 PM EDT | Tornado Warning | ALY | Montgomery, Saratoga, Schenectady | 23 min |
| Sep 4, 5:32 PM EDT | Flash Flood Warning | ALY | Fulton, Hamilton, Herkimer, Montgomery | 12 hr |
| Sep 4, 5:47 PM EDT | Severe Thunderstorm Warning | ALY | Albany, Rensselaer, Saratoga, Schenectady, Washington | 58 min |
| Sep 4, 6:41 PM EDT | Severe Thunderstorm Warning | ALY | Rensselaer, Washington | 64 min |
| Sep 4, 7:11 PM EDT | Severe Thunderstorm Warning | BTV | Franklin, Lamoille, Orleans | 64 min |
| Sep 4, 7:46 PM EDT | Severe Thunderstorm Warning | ALY | Rensselaer | 56 min |
| Sep 4, 7:53 PM EDT | Severe Thunderstorm Warning | CTP | Columbia, Montour, Northumberland, Snyder, Union | 67 min |
| Sep 4, 8:12 PM EDT | Flash Flood Warning | ALY | Washington | 4 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
Albany, NY (KALY), launched 12:00Z, 6.7 hours before the alert went out and 101 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
- 277 J/kg
- Mixed-layer CIN
- -194 J/kg
- Mixed-layer LCL
- 765 m above ground
- 0-6 km bulk shear
- 23 kt
- 0-1 km storm-relative helicity
- 77 m²/s²
- 0-3 km storm-relative helicity
- 106 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.4
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 4, 12:17 PM EDT | Mesoscale Discussion | SPC | Coos | 58 min |
| Sep 4, 1:01 PM EDT | Severe Thunderstorm Watch | SPC | Carroll, Coos, Grafton | 7 hr |
| Sep 4, 4:07 PM EDT | Mesoscale Discussion | SPC | Belknap, Carroll, Coos, Grafton | 53 min |
| Sep 4, 3:07 AM EDT | Mesoscale Discussion | SPC | Allegany, Cattaraugus, Cayuga, Erie, Genesee, Livingston and 8 more | 83 min |
| Sep 4, 3:26 AM EDT | Severe Thunderstorm Watch | SPC | Allegany, Cattaraugus, Cayuga, Chautauqua, Erie, Genesee and 16 more | 4 hr |
| Sep 4, 6:22 AM EDT | Mesoscale Discussion | SPC | Cayuga, Jefferson, Lewis, Oneida, Onondaga, Ontario and 4 more | 83 min |
| Sep 4, 1:33 PM EDT | Mesoscale Discussion | SPC | Broome, Chemung, Chenango, Cortland, Delaware, Fulton and 13 more | 87 min |
| Sep 4, 6:06 PM EDT | Mesoscale Discussion | SPC | Albany, Broome, Cayuga, Chemung, Chenango, Clinton and 30 more | 54 min |
Nearby
Severe Thunderstorm Watches in New York, 2011Severe Thunderstorm Watches in Pennsylvania, 2011Severe Thunderstorm Watches in Vermont, 2011Every severe thunderstorm watch in 2011
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.