Alert archive / New York / Severe Thunderstorm Watches in 2007
Severe Thunderstorm Watch 663
The Storm Prediction Center issued this severe thunderstorm watch at Aug 30, 2007, 3:07 PM EDT for 5 states. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Aug 30, 2007, 3:07 PM EDT (19:07 UTC)
- Expired
- Aug 30, 2007, 9:00 PM EDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1.5 in
- Strongest gust expected
- 60 kt
All 47 counties
Berkshire County, MA, Franklin County, MA, Hampshire County, MA, Androscoggin County, ME, Cumberland County, ME, Franklin County, ME, Kennebec County, ME, Knox County, ME, Lincoln County, ME, Oxford County, ME, Sagadahoc County, ME, Somerset County, ME, Waldo County, ME, York County, ME, Belknap County, NH, Carroll County, NH, Cheshire County, NH, Coos County, NH, Grafton County, NH, Hillsborough County, NH, Merrimack County, NH, Rockingham County, NH, Strafford County, NH, Sullivan County, NH, Albany County, NY, Columbia County, NY, Essex County, NY, Fulton County, NY, Greene County, NY, Hamilton County, NY, Herkimer County, NY, Montgomery County, NY, Rensselaer County, NY, Saratoga County, NY, Schenectady County, NY, Schoharie County, NY, Warren County, NY, Washington County, NY, Addison County, VT, Bennington County, VT, Caledonia County, VT, Essex County, VT, Orange County, VT, Rutland County, VT, Washington County, VT, Windham County, VT, Windsor County, VT
The radar
The Burlington radar (KCXX), 100 km from the middle of the area, began a volume at 19:09 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
- 5%
- 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
- 40%
- Six or more combined severe hail and wind reports
- 90%
Warnings issued inside it
24 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 30, 3:12 PM EDT | Severe Thunderstorm Warning | BTV | Essex | 33 min |
| Aug 30, 3:27 PM EDT | Severe Thunderstorm Warning | GYX | Coos | 48 min |
| Aug 30, 3:31 PM EDT | Severe Thunderstorm Warning | ALY | Warren | 59 min |
| Aug 30, 3:39 PM EDT | Severe Thunderstorm Warning | GYX | Franklin | 66 min |
| Aug 30, 3:40 PM EDT | Severe Thunderstorm Warning | GYX | Grafton | 65 min |
| Aug 30, 3:56 PM EDT | Severe Thunderstorm Warning | GYX | Oxford | 64 min |
| Aug 30, 4:05 PM EDT | Severe Thunderstorm Warning | BTV | Essex | 28 min |
| Aug 30, 4:39 PM EDT | Severe Thunderstorm Warning | GYX | Kennebec | 66 min |
| Aug 30, 4:55 PM EDT | Severe Thunderstorm Warning | GYX | Grafton | 65 min |
| Aug 30, 4:56 PM EDT | Severe Thunderstorm Warning | GYX | Oxford | 64 min |
| Aug 30, 5:03 PM EDT | Severe Thunderstorm Warning | GYX | Franklin | 42 min |
| Aug 30, 5:08 PM EDT | Severe Thunderstorm Warning | GYX | Somerset | 52 min |
| Aug 30, 5:08 PM EDT | Severe Thunderstorm Warning | GYX | Sullivan | 52 min |
| Aug 30, 5:10 PM EDT | Severe Thunderstorm Warning | GYX | Oxford | 50 min |
| Aug 30, 5:21 PM EDT | Severe Thunderstorm Warning | ALY | Rensselaer | 54 min |
| Aug 30, 5:25 PM EDT | Severe Thunderstorm Warning | GYX | Androscoggin | 50 min |
| Aug 30, 5:55 PM EDT | Severe Thunderstorm Warning | GYX | Oxford | 35 min |
| Aug 30, 6:04 PM EDT | Severe Thunderstorm Warning | ALY | Greene | 56 min |
| Aug 30, 6:09 PM EDT | Severe Thunderstorm Warning | GYX | Somerset | 36 min |
| Aug 30, 6:14 PM EDT | Severe Thunderstorm Warning | GYX | Grafton | 46 min |
| Aug 30, 6:29 PM EDT | Severe Thunderstorm Warning | GYX | Merrimack | 46 min |
| Aug 30, 6:35 PM EDT | Severe Thunderstorm Warning | GYX | Sullivan | 40 min |
| Aug 30, 6:46 PM EDT | Severe Thunderstorm Warning | ALY | Columbia | 59 min |
| Aug 30, 7:00 PM EDT | Severe Thunderstorm Warning | ALY | Greene | 27 min |
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, 7.1 hours before the alert went out and 153 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
- 548 J/kg
- Mixed-layer CIN
- -162 J/kg
- Mixed-layer LCL
- 751 m above ground
- 0-6 km bulk shear
- 19 kt
- 0-1 km storm-relative helicity
- 6 m²/s²
- 0-3 km storm-relative helicity
- 30 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 30, 11:07 AM EDT | Mesoscale Discussion | SPC | Franklin, Kennebec, Oxford, Penobscot, Piscataquis, Somerset | 113 min |
| Aug 30, 2:20 PM EDT | Mesoscale Discussion | SPC | Oxford | 115 min |
| Aug 30, 5:00 PM EDT | Mesoscale Discussion | SPC | Androscoggin, Cumberland, Franklin, Kennebec, Lincoln, Oxford and 3 more | 60 min |
| Aug 30, 6:23 PM EDT | Mesoscale Discussion | SPC | Androscoggin, Cumberland, Franklin, Kennebec, Oxford, Penobscot and 4 more | 97 min |
Nearby
Severe Thunderstorm Watches in New York, 2007Severe Thunderstorm Watches in Maine, 2007Severe Thunderstorm Watches in New Hampshire, 2007Every severe thunderstorm watch 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.