Alert archive / New Hampshire / Severe Thunderstorm Watches in 2017
Severe Thunderstorm Watch 463
The Storm Prediction Center issued this severe thunderstorm watch at Aug 22, 2017, 3:55 PM EDT for 6 states. It was in force for 8 hr.
The area
The outline as issued.
The facts
- Issued
- Aug 22, 2017, 3:55 PM EDT (19:55 UTC)
- Expired
- Aug 23, 2017, 12:00 AM EDT
- In force
- 8 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1 in
- Strongest gust expected
- 60 kt
All 38 counties
Capitol Planning Region, CT, Northwest Hills Planning Region, CT, Berkshire County, MA, Franklin County, MA, Hampden County, MA, Hampshire County, MA, Franklin County, ME, Oxford 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, Dutchess County, NY, Greene County, NY, Rensselaer County, NY, Saratoga County, NY, Schenectady County, NY, Schoharie County, NY, Ulster County, NY, Washington County, NY, Bennington County, VT, Caledonia County, VT, Essex 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 Burlington radar (KCXX), 101 km from the middle of the area, began a volume at 19:58 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
- 10%
- Ten or more severe wind reports
- 60%
- One or more gusts of 65 knots or more
- 20%
- Ten or more severe hail reports
- 5%
- One or more hailstones of 2 inches or more
- 5%
- Six or more combined severe hail and wind reports
- 70%
Warnings issued inside it
29 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 22, 5:35 PM EDT | Severe Thunderstorm Warning | ALY | Warren, Washington | 55 min |
| Aug 22, 5:39 PM EDT | Severe Thunderstorm Warning | ALY | Fulton, Hamilton, Saratoga, Warren | 66 min |
| Aug 22, 5:43 PM EDT | Severe Thunderstorm Warning | BTV | Addison, Rutland, Washington | 48 min |
| Aug 22, 5:46 PM EDT | Severe Thunderstorm Warning | BTV | Caledonia, Franklin, Lamoille, Orleans | 59 min |
| Aug 22, 6:00 PM EDT | Severe Thunderstorm Warning | BTV | Addison, Chittenden, Grand Isle, Lamoille, Washington | 33 min |
| Aug 22, 6:15 PM EDT | Severe Thunderstorm Warning | ALY | Fulton, Montgomery, Saratoga, Schenectady | 34 min |
| Aug 22, 6:28 PM EDT | Severe Thunderstorm Warning | BTV | Addison, Caledonia, Chittenden, Essex, Lamoille, Orange and 4 more | 77 min |
| Aug 22, 6:46 PM EDT | Severe Thunderstorm Warning | GYX | Oxford | 44 min |
| Aug 22, 7:03 PM EDT | Severe Thunderstorm Warning | GYX | Coos, Grafton | 57 min |
| Aug 22, 7:20 PM EDT | Severe Thunderstorm Warning | ALY | Albany, Schenectady, Schoharie | 55 min |
| Aug 22, 7:30 PM EDT | Severe Thunderstorm Warning | GYX | Androscoggin, Franklin, Kennebec, Oxford | 45 min |
| Aug 22, 7:47 PM EDT | Severe Thunderstorm Warning | ALY | Washington | 58 min |
| Aug 22, 7:58 PM EDT | Severe Thunderstorm Warning | GYX | Franklin, Oxford | 47 min |
| Aug 22, 8:09 PM EDT | Severe Thunderstorm Warning | GYX | Franklin, Kennebec, Somerset | 26 min |
| Aug 22, 8:16 PM EDT | Severe Thunderstorm Warning | ALY | Columbia, Dutchess, Ulster | 44 min |
| Aug 22, 8:28 PM EDT | Severe Thunderstorm Warning | ALY | Rensselaer, Saratoga, Washington | 62 min |
| Aug 22, 9:06 PM EDT | Severe Thunderstorm Warning | BTV | Rutland, Windsor | 54 min |
| Aug 22, 9:20 PM EDT | Severe Thunderstorm Warning | GYX | Cheshire, Grafton, Merrimack, Sullivan | 55 min |
| Aug 22, 9:20 PM EDT | Severe Thunderstorm Warning | ALY | Bennington, Windham | 55 min |
| Aug 22, 9:23 PM EDT | Severe Thunderstorm Warning | ALY | Dutchess, Ulster | 55 min |
| Aug 22, 9:38 PM EDT | Severe Thunderstorm Warning | ALY | Berkshire | 67 min |
| Aug 22, 9:52 PM EDT | Severe Thunderstorm Warning | GYX | Belknap, Carroll, Grafton, Merrimack, Sullivan | 53 min |
| Aug 22, 10:04 PM EDT | Severe Thunderstorm Warning | GYX | Franklin, Oxford | 41 min |
| Aug 22, 10:08 PM EDT | Severe Thunderstorm Warning | BOX | Franklin, Hampden, Hampshire | 55 min |
| Aug 22, 10:08 PM EDT | Severe Thunderstorm Warning | GYX | Cheshire, Hillsborough, Merrimack, Sullivan | 67 min |
| Aug 22, 10:13 PM EDT | Flash Flood Warning | ALY | Berkshire | 2 hr |
| Aug 22, 10:25 PM EDT | Severe Thunderstorm Warning | GYX | Belknap, Carroll, Merrimack, Strafford | 51 min |
| Aug 22, 11:08 PM EDT | Severe Thunderstorm Warning | ALY | Northwest Hills Planning Region | 31 min |
| Aug 22, 11:33 PM EDT | Severe Thunderstorm Warning | BOX | Franklin, Hampden, Hampshire, Middlesex, Worcester | 57 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, 7.9 hours before the alert went out and 152 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
- 87 J/kg
- Mixed-layer CIN
- -80 J/kg
- Mixed-layer LCL
- 932 m above ground
- 0-6 km bulk shear
- 28 kt
- 0-1 km storm-relative helicity
- 102 m²/s²
- 0-3 km storm-relative helicity
- 163 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 22, 4:19 PM EDT | Severe Thunderstorm Watch | SPC | Greater Bridgeport Planning Region | 8 hr |
| Aug 22, 7:07 PM EDT | Mesoscale Discussion | SPC | 113 min | |
| Aug 22, 5:49 PM EDT | Mesoscale Discussion | SPC | Berkshire, Franklin, Hampden, Hampshire | 116 min |
| Aug 22, 2:44 PM EDT | Mesoscale Discussion | SPC | Grafton | 2 hr |
| Aug 22, 11:55 AM EDT | Mesoscale Discussion | SPC | Allegany, Broome, Cattaraugus, Cayuga, Chemung, Chenango and 23 more | 3 hr |
| Aug 22, 12:23 PM EDT | Tornado Watch | SPC | Allegany, Broome, Cattaraugus, Cayuga, Chautauqua, Chemung and 36 more | 9 hr |
| Aug 22, 3:08 PM EDT | Mesoscale Discussion | SPC | Delaware, Dutchess, Orange, Putnam, Rockland, Sullivan and 1 more | 67 min |
| Aug 22, 4:48 PM EDT | Mesoscale Discussion | SPC | Broome, Cayuga, Chemung, Chenango, Clinton, Cortland and 21 more | 87 min |
Nearby
Severe Thunderstorm Watches in New Hampshire, 2017Severe Thunderstorm Watches in New York, 2017Severe Thunderstorm Watches in Vermont, 2017Every severe thunderstorm watch in 2017
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.