Alert archive / Vermont / Severe Thunderstorm Watches in 2011
Severe Thunderstorm Watch 654
The Storm Prediction Center issued this severe thunderstorm watch at Jul 17, 2011, 7:41 PM EDT for Coos County, Grafton County, New Hampshire; 4 counties in New York; 10 counties in Vermont. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- Jul 17, 2011, 7:41 PM EDT (23:41 UTC)
- Expired
- Jul 18, 2011, 1:00 AM EDT
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1.5 in
- Strongest gust expected
- 60 kt
Counties Coos County, NH, Grafton County, NH, Clinton County, NY, Essex County, NY, Franklin County, NY, St. Lawrence County, NY, Addison 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, Washington County, VT
The radar
The Burlington radar (KCXX), 28 km from the middle of the area, began a volume at 23:39 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
- 5%
- Ten or more severe wind reports
- 60%
- One or more gusts of 65 knots or more
- 30%
- Ten or more severe hail reports
- 30%
- One or more hailstones of 2 inches or more
- 10%
- Six or more combined severe hail and wind reports
- 80%
Warnings issued inside it
4 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 17, 8:11 PM EDT | Severe Thunderstorm Warning | BTV | Franklin, St. Lawrence | 50 min |
| Jul 17, 8:44 PM EDT | Severe Thunderstorm Warning | BTV | Clinton, Franklin, St. Lawrence | 61 min |
| Jul 17, 9:10 PM EDT | Severe Thunderstorm Warning | BTV | Clinton, Essex, Franklin, St. Lawrence | 50 min |
| Jul 17, 9:25 PM EDT | Severe Thunderstorm Warning | BTV | Clinton, Essex | 50 min |
Discussions around it
SPC mesoscale discussions over the same counties from four hours before the watch to its end.
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 17, 7:12 PM EDT | Mesoscale Discussion | SPC | Coos | 63 min |
Nearby
Severe Thunderstorm Watches in Vermont, 2011Severe Thunderstorm Watches in New York, 2011Severe Thunderstorm Watches in New Hampshire, 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; radar from the NEXRAD Level II archive.