An approaching shortwave and increasing shear combined with a slow moving cold front to produce scattered showers and thunderstorms on the afternoon of July 28th. Many reports of wind damage and a few reports of large hail were associated with these storms as they moved through New Hampshire.
Every event with a place to put it. Tap one for its entry below.
Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS GYX wrote it up.
An approaching shortwave and increasing shear combined with a slow moving cold front to produce scattered showers and thunderstorms on the afternoon of July 28th. Many reports of wind damage and a few reports of large hail were associated with these storms as they moved through New Hampshire.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Gray, ME wrote its last area forecast discussion before the first event at Jul 28, 10:38 AM EST, 3 hours 27 minutes earlier.
Area Forecast Discussion National Weather Service Gray ME 1138 AM EDT Sat Jul 28 2018 .SYNOPSIS... A cold front slowly pushes through the area today and tonight, with an area of showers and thunderstorms along and ahead of the front today. Some drier air moves in for Sunday and Monday. High pressure will gradually shift offshore Monday night and Tuesday. A warm front lifts north for Wednesday with a weak cold front slowly following from Canada late Wednesday through Thursday. && .NEAR TERM /UNTIL 6 PM THIS EVENING/... 1130 AM...A few cells popping up over the mtns/foothills of wrn ME, but nothing with any lasting power yet. Will have to wait until we get the forcing aloft to move in mid-late afternoon to see any decent development of convective cells. Mostly will be watching for pulse storms as there's enough deep lyr shear to get a few updrafts to rotate briefly, and enough wind aloft to cause some problems if it gets down to the sfc. PWATS are down fro previous days, thanks to direr mid levels, but enough low level moisture in the CWA to still produce some heavy downpours with decent amount of lightning, although training seems less likely. Convection will likely linger into early evening, but should be diminishing. 855 AM...Quick update to better show a lull in precip for a few hours this morning. Cannot rule out convective cell popping up, especially across the foothills/mtns, however, they will be very few and far between, and will see better coverage this afternoon once we get a few hours of heating. 730AM UPDATE... We are finally seeing radar echoes dissipate this morning, but expect this to be only temporary. Have adjusted hourly precipitation chances a bit, but forecast still seems largely on track. ORIGINAL DISCUSSION... Upper level low pressure spinning over James Bay/Ontario continues to pull in a stream of moist, unstable air northward through New England. This has been producing scattered showers and a few thunderstorms even during the overnight hours. The upper low lifts to the northeast today, with the trough axis shifting through New England as well. As a result, expect this corridor of instability to be over our area again today allowing more showers and thunderstorms to form throughout the day. With afternoon heating, we could see enough instability for some stronger updrafts. Wind flow aloft is slightly stronger than yesterday, suggesting that a few supercells will be possible as well as multicell clusters with downburst winds the primary severe weather threat. This threat exists over virtually the entire forecast area today as the trough axis swings by. && .SHORT TERM /6 PM THIS EVENING THROUGH 6 PM SUNDAY/... Upper trough axis shifts east of the area tonight, bringing the threat of showers and thunderstorms to an end. Slightly drier air moves in behind the trough, bringing a comfortable night with temperatures in the 60s and upper 50s. Sunday should be warm and less humid with temperatures in the 80s. && .LONG TERM /SUNDAY NIGHT THROUGH FRIDAY/... Large scale troughing will remain in place from the Great Lakes down to the Gulf Coast states this week. Bermuda high pressure will build and linger along the Eastern CONUS. Northern New England will generally be in westerly to southwesterly flow in between these two features...with short wave energy periodically bringing showers and thunderstorms to the region. Monday will be sunny with highs in the upper 70s along the international border with lower to mid 80s more common for central and southern areas. Clouds will increase from the southwest Monday night into Tuesday, with fog a concern once again as moisture increases. Showers will be possible late Tuesday into Wednesday as a warm front lifts north into the area. We will remain in the warm sector Wednesday and Thursday as the boundary stalls in the area, with bouts of showers which will produce heavy rain given the warm rain profiles in place and the PWATs expected. A few inland sites will make a run towards 90 degrees during this time. We will have a shot at some strong storms late in the week given the stronger forcing for ascent arriving aloft in the Thursday afternoon/evening time frame. At the surface, a wavy baroclinic zone will likely be stalled over NH and ME by weeks' end, providing a focus for showers and thunderstorms. && .AVIATION /16Z SATURDAY THROUGH WEDNESDAY/... Short Term...Mostly VFR today with scattered showers and thunderstorms area wide. Should see this activity come to an end this evening with light winds and VFR conditions expected Sunday. Long Term...VFR will likely dominate the Monday through Wednesday period outside of areas of morning fog each day. By midweek and beyond...there is an increasing threat for restrictions in showers/thunderstorms with more widespread and dense fog likely during the overnight hours. && .MARINE... Short Term...Light southerly winds expected over the waters today, shifting to the southwest or west Sunday as high pressure slides to the south. Any remaining fog over the waters today should disperse as drier air moves in this afternoon and tonight. Long Term...No flags likely Monday through early Wednesday with SCAs likely beginning late Wednesday. Good chance for dense marine fog particularly for the middle and end of next week. && .GYX WATCHES/WARNINGS/ADVISORIES... ME...None. NH...None. MARINE...None. && SYNOPSIS... NEAR TERM...Cempa/Kimble SHORT TERM...Kimble LONG TERM...Hanes AVIATION... MARINE...
Hazardous Weather Outlook National Weather Service Gray ME 320 AM EDT Sat Jul 28 2018 MEZ007>009-012>014-018>028-NHZ001>015-290730- Northern Oxford-Northern Franklin-Central Somerset-Southern Oxford- Southern Franklin-Southern Somerset-Interior York- Interior Cumberland-Androscoggin-Kennebec-Interior Waldo- Coastal York-Coastal Cumberland-Sagadahoc-Lincoln-Knox-Coastal Waldo- Northern Coos-Southern Coos-Northern Grafton-Northern Carroll- Southern Grafton-Southern Carroll-Sullivan-Merrimack-Belknap- Strafford-Cheshire-Eastern Hillsborough-Interior Rockingham- Coastal Rockingham-Western And Central Hillsborough- 320 AM EDT Sat Jul 28 2018 This Hazardous Weather Outlook is for Maine, south central Maine, southwest Maine, west central Maine, western Maine, New Hampshire, central New Hampshire, northern New Hampshire and southern New Hampshire. .DAY ONE...Today and Tonight. Showers and thunderstorms are once again possible this afternoon. Gusty winds, hail, and heavy downpours are all possible. .DAYS TWO THROUGH SEVEN...Sunday through Friday. No hazardous weather is expected at this time. .SPOTTER INFORMATION STATEMENT... Weather spotters are encouraged to report significant weather conditions according to Standard Operating Procedures. ANZ150>154-290730- Coastal Waters from Stonington, ME to Port Clyde, ME out 25 NM- Penobscot Bay- Coastal Waters from Port Clyde, ME to Cape Elizabeth, ME out 25 NM- Casco Bay- Coastal Waters from Cape Elizabeth, ME to Merrimack River, MA out 25 NM- 320 AM EDT Sat Jul 28 2018 This Hazardous Weather Outlook is for Atlantic coastal waters. .DAY ONE...Today and Tonight. No hazardous weather is expected at this time. .DAYS TWO THROUGH SEVEN...Sunday through Friday. No hazardous weather is expected at this time. .SPOTTER INFORMATION STATEMENT... Weather spotters are encouraged to report significant weather conditions according to Standard Operating Procedures.
Special Weather Statement National Weather Service Gray ME 228 PM EDT SAT JUL 28 2018 NHZ008>010-013-281915- Merrimack-Belknap-Strafford-Interior Rockingham- 228 PM EDT SAT JUL 28 2018 ...A STRONG THUNDERSTORM WILL AFFECT NORTHWESTERN ROCKINGHAM... SOUTHWESTERN STRAFFORD AND SOUTHEASTERN MERRIMACK COUNTIES... At 228 PM EDT, a strong thunderstorm was located near Hooksett, or 7 miles north of Auburn, moving northeast at 20 mph. Winds in excess of 30 mph and pea size hail are possible with this storm. Locations impacted include... Northwood, Hooksett, Barrington, Epsom, Raymond, Bow, Lee, Allenstown, Deerfield, Candia, Chichester, Nottingham, Pembroke, Strafford and Pittsfield. This includes Interstate 93 between mile markers 29 and 34. LAT...LON 4303 7143 4315 7153 4334 7113 4310 7097 TIME...MOT...LOC 1828Z 244DEG 16KT 4311 7139
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</html>The Albany radar (KENX), 135 km away, was scanning. The volume nearest the first event began at 19:06 UTC.
21 thunderstorm wind, 2 hail. Local standard time, as filed.
A severe thunderstorm downed trees and wires on River Road in Park Hill.
A severe thunderstorm downed trees and wires on County Road in Christian Hollow.
A severe thunderstorm downed trees and wires on Wentworth Road in Christian Hollow.
A severe thunderstorm downed trees on Kingsbury Road in Walpole.
A severe thunderstorm downed trees and wires on Old Cheshire Turnpike in Drewsville.
A severe thunderstorm downed trees and wires in Nottingham.
A severe thunderstorm downed trees and wires on Route 12A in Surry.
A severe thunderstorm downed a tree onto wires on Route 10 in Gilsum.
A severe thunderstorm downed numerous trees and wires on Route 123 in Mill Village.
A severe thunderstorm downed multiple trees and wires on Turtle Rock Road in Stoddard.
A severe thunderstorm produced 1 inch hail in Dover.
A severe thunderstorm downed a large tree and multiple large branches in Hennicker.
A severe thunderstorm downed power lines on Cross Mill Road in Franklin Falls.
A severe thunderstorm downed trees on wires in Hopkinton.
A severe thunderstorm downed trees and wires in Chichester.
A microburst from a severe thunderstorm downed numerous large trees around the Bow Lake area. One tree landed on a house near Bow Lake where eight people had taken cover from the storm. Six of the 8 were treated at the scene and 2 were taken to hospital.
A severe thunderstorm downed numerous trees throughout the town of Strafford.
A severe thunderstorm downed multiple trees and wires on Scribner Road in Strafford.
A severe thunderstorm produced 1.25 inch hail in Bow Lake Village.
A severe thunderstorm downed trees and wires in Surry.
A severe thunderstorm downed trees near Route 110 in Northumberland.
A severe thunderstorm downed trees and wires in Stark.
A severe thunderstorm downed trees and power lines, knocking out power in Errol.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in New Hampshire in 2018Every state in 2018This day in weather historyWarnings in New Hampshire, July 2018
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-10-01. Each event’s entry at NCEI: 775315, 775314, 775316, 775317, 775318, 775319, 775320, 775321, 775322, 775323, 775312, 775324, 775325, 775326, 775327, 775329, 775333, 775332, 775313, 775334, 775335, 775336, 775337.