Alert archive / New Hampshire / Severe Thunderstorm Watches in 2021
Severe Thunderstorm Watch 208
The Storm Prediction Center issued this severe thunderstorm watch at May 26, 2021, 3:56 PM EDT for 4 states. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- May 26, 2021, 3:56 PM EDT (19:56 UTC)
- Expired
- May 26, 2021, 9:12 PM EDT
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1 in
- Strongest gust expected
- 60 kt
All 21 counties
Capitol Planning Region, CT, Northeastern Connecticut Planning Region, CT, Essex County, MA, Franklin County, MA, Hampden County, MA, Hampshire County, MA, Middlesex County, MA, Worcester County, MA, Cumberland County, ME, Oxford 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
The radar
The Portland,ME radar (KGYX), 79 km from the middle of the area, began a volume at 19:59 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
- 50%
- One or more gusts of 65 knots or more
- 20%
- Ten or more severe hail reports
- 10%
- One or more hailstones of 2 inches or more
- 5%
- Six or more combined severe hail and wind reports
- 60%
Warnings issued inside it
15 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 26, 4:51 PM EDT | Severe Thunderstorm Warning | GYX | Coos, Grafton | 54 min |
| May 26, 5:07 PM EDT | Severe Thunderstorm Warning | GYX | Grafton, Merrimack, Sullivan | 53 min |
| May 26, 5:14 PM EDT | Severe Thunderstorm Warning | GYX | Cheshire, Hillsborough, Merrimack, Sullivan | 46 min |
| May 26, 5:47 PM EDT | Severe Thunderstorm Warning | BOX | Franklin, Hampshire, Worcester | 58 min |
| May 26, 5:52 PM EDT | Severe Thunderstorm Warning | GYX | Belknap, Carroll, Grafton, Merrimack, Strafford | 53 min |
| May 26, 5:58 PM EDT | Severe Thunderstorm Warning | GYX | Belknap, Cheshire, Hillsborough, Merrimack, Rockingham, Strafford and 1 more | 62 min |
| May 26, 6:13 PM EDT | Severe Thunderstorm Warning | BOX | Franklin, Middlesex, Worcester | 62 min |
| May 26, 6:30 PM EDT | Severe Thunderstorm Warning | GYX | Cumberland, Oxford, York | 60 min |
| May 26, 6:39 PM EDT | Severe Thunderstorm Warning | BOX | Franklin, Hampden, Hampshire, Worcester | 66 min |
| May 26, 6:59 PM EDT | Severe Thunderstorm Warning | GYX | York | 61 min |
| May 26, 7:05 PM EDT | Severe Thunderstorm Warning | BOX | Capitol Planning Region | 55 min |
| May 26, 7:16 PM EDT | Severe Thunderstorm Warning | GYX | Cumberland, York | 22 min |
| May 26, 7:40 PM EDT | Severe Thunderstorm Warning | BOX | Capitol Planning Region | 65 min |
| May 26, 7:45 PM EDT | Severe Thunderstorm Warning | BOX | Capitol Planning Region, Northeastern Connecticut Planning Region | 60 min |
| May 26, 8:22 PM EDT | Severe Thunderstorm Warning | BOX | Northeastern Connecticut Planning Region | 38 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, 7.9 hours before the alert went out and 78 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
- 9 J/kg
- Mixed-layer CIN
- -211 J/kg
- Mixed-layer LCL
- 1555 m above ground
- 0-6 km bulk shear
- 37 kt
- 0-1 km storm-relative helicity
- 68 m²/s²
- 0-3 km storm-relative helicity
- 140 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
664 WWUS20 KWNS 261954 SEL8 SPC WW 261954 CTZ000-MAZ000-MEZ000-NHZ000-270300- URGENT - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Watch Number 208 NWS Storm Prediction Center Norman OK 355 PM EDT Wed May 26 2021 The NWS Storm Prediction Center has issued a * Severe Thunderstorm Watch for portions of Northern Connecticut Central Massachusetts Western Maine New Hampshire * Effective this Wednesday afternoon and evening from 355 PM until 1100 PM EDT. * Primary threats include... Scattered damaging wind gusts to 70 mph possible SUMMARY...Thunderstorms over New York and Vermont will track eastward across the watch area this afternoon and evening. Hot and humid conditions, coupled with strong winds aloft, will pose a risk of locally damaging wind gusts in the strongest cells. The severe thunderstorm watch area is approximately along and 45 statute miles east and west of a line from 25 miles northeast of Berlin NH to 25 miles east southeast of Windsor Locks CT. For a complete depiction of the watch see the associated watch outline update (WOUS64 KWNS WOU8). PRECAUTIONARY/PREPAREDNESS ACTIONS... REMEMBER...A Severe Thunderstorm Watch means conditions are favorable for severe thunderstorms in and close to the watch area. Persons in these areas should be on the lookout for threatening weather conditions and listen for later statements and possible warnings. Severe thunderstorms can and occasionally do produce tornadoes. && OTHER WATCH INFORMATION...CONTINUE...WW 205...WW 206...WW 207... AVIATION...A few severe thunderstorms with hail surface and aloft to 1 inch. Extreme turbulence and surface wind gusts to 60 knots. A few cumulonimbi with maximum tops to 450. Mean storm motion vector 26035. ...Hart
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 26, 12:59 PM EDT | Severe Thunderstorm Watch | SPC | Northwest Hills Planning Region | 7 hr |
| May 26, 2:48 PM EDT | Severe Thunderstorm Watch | SPC | Greater Bridgeport Planning Region | 7 hr |
| May 26, 3:21 PM EDT | Mesoscale Discussion | SPC | 54 min | |
| May 26, 4:41 PM EDT | Mesoscale Discussion | SPC | 64 min | |
| May 26, 6:07 PM EDT | Mesoscale Discussion | SPC | 113 min | |
| May 26, 12:16 PM EDT | Mesoscale Discussion | SPC | Addison, Bennington, Rutland, Washington, Windsor | 119 min |
Nearby
Severe Thunderstorm Watches in New Hampshire, 2021Severe Thunderstorm Watches in Massachusetts, 2021Severe Thunderstorm Watches in Connecticut, 2021Every severe thunderstorm watch in 2021
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.