Alert archive / New Hampshire / Severe Thunderstorm Watches in 2015
Severe Thunderstorm Watch 232
The Storm Prediction Center issued this severe thunderstorm watch at May 27, 2015, 5:02 PM EDT for 4 states. It was in force for 4 hr.
The area
The outline as issued.
The facts
- Issued
- May 27, 2015, 5:02 PM EDT (21:02 UTC)
- Expired
- May 27, 2015, 8:53 PM EDT
- In force
- 4 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1 in
- Strongest gust expected
- 60 kt
Counties Capitol Planning Region, CT, Northeastern Connecticut Planning Region, CT, Franklin County, MA, Hampden County, MA, Hampshire County, MA, Suffolk County, MA, Worcester 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, Sullivan County, NH
The radar
The Portland,ME radar (KGYX), 104 km from the middle of the area, began a volume at 21:04 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
- 10%
- One or more EF2 to EF5 tornadoes
- 2%
- Ten or more severe wind reports
- 30%
- One or more gusts of 65 knots or more
- 10%
- Ten or more severe hail reports
- 10%
- One or more hailstones of 2 inches or more
- 10%
- Six or more combined severe hail and wind reports
- 60%
Warnings issued inside it
9 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 27, 5:17 PM EDT | Severe Thunderstorm Warning | GYX | Grafton, Merrimack, Sullivan | 43 min |
| May 27, 5:24 PM EDT | Flash Flood Warning | GYX | Grafton, Sullivan | 3 hr |
| May 27, 5:29 PM EDT | Severe Thunderstorm Warning | BOX | Franklin, Hampden, Hampshire | 61 min |
| May 27, 5:31 PM EDT | Severe Thunderstorm Warning | GYX | Belknap, Carroll, Coos, Grafton | 44 min |
| May 27, 6:08 PM EDT | Severe Thunderstorm Warning | GYX | Franklin, Somerset | 37 min |
| May 27, 6:09 PM EDT | Severe Thunderstorm Warning | GYX | Cumberland, Oxford | 40 min |
| May 27, 6:27 PM EDT | Severe Thunderstorm Warning | BOX | Franklin, Hampshire, Worcester | 50 min |
| May 27, 6:42 PM EDT | Severe Thunderstorm Warning | BOX | Capitol Planning Region | 37 min |
| May 27, 6:47 PM EDT | Severe Thunderstorm Warning | GYX | Cheshire, Hillsborough | 43 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
Gray, ME (KGYX), launched 12:00Z, 9.0 hours before the alert went out and 104 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
- 171 J/kg
- Mixed-layer CIN
- -109 J/kg
- Mixed-layer LCL
- 1251 m above ground
- 0-6 km bulk shear
- 33 kt
- 0-1 km storm-relative helicity
- 65 m²/s²
- 0-3 km storm-relative helicity
- 100 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 |
|---|---|---|---|---|
| May 27, 12:54 PM EDT | Severe Thunderstorm Watch | SPC | Greater Bridgeport Planning Region, Northwest Hills Planning Region | 6 hr |
| May 27, 2:59 PM EDT | Mesoscale Discussion | SPC | 2 hr | |
| May 27, 4:49 PM EDT | Mesoscale Discussion | SPC | 86 min | |
| May 27, 7:21 PM EDT | Mesoscale Discussion | SPC | 54 min | |
| May 27, 6:17 PM EDT | Mesoscale Discussion | SPC | Aroostook, Penobscot, Piscataquis | 58 min |
| May 27, 11:50 AM EDT | Mesoscale Discussion | SPC | Berkshire | 85 min |
Nearby
Severe Thunderstorm Watches in New Hampshire, 2015Severe Thunderstorm Watches in Massachusetts, 2015Severe Thunderstorm Watches in Connecticut, 2015Every severe thunderstorm watch in 2015
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.