A weak, slow-moving cold front was the focus for afternoon showers and thunderstorms in a very warm and humid air mass. A few storms reached severe limits producing reports of wind damage.
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.
A weak, slow-moving cold front was the focus for afternoon showers and thunderstorms in a very warm and humid air mass. A few storms reached severe limits producing reports of wind damage.
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 27, 9:23 AM EST, 3 hours 57 minutes earlier.
Area Forecast Discussion National Weather Service Gray ME 1023 AM EDT Fri Jul 27 2018 .SYNOPSIS... Humid conditions continue today as an upper level trough spins over the northern Great Lakes, sending a slow moving cold front toward our area. Expect some showers and thunderstorms to form mainly over western areas this afternoon. Some of the storms could bring gusty winds and heavy rainfall. Thunderstorm activity will weaken and spread east overnight, with another round of showers and storms possible on Saturday before the front finally moves through. Once the front moves through, we will see a bit drier air moving in with sunshine expected into early next week. && .NEAR TERM /UNTIL 6 PM THIS EVENING/... 1000 AM Update... Morning fog has finally cleared mid coast and southern interior sections of Maine late this morning and expect remaining patchy stratus to gradually dry up through noon. Have updated zones to drop dense fog advisory headlines. Attention will turn next to northwest zones where approaching front will initiate convection during the early to mid afternoon time frame. SPC has much of the area in marginal risk for severe with slight chance nosing into southwest New Hampshire. Main threat with these storms will be strong winds but a secondary problem will be heavy rainfall which may pose a `flash flood risk in any training cells. Have adjusted area temps/tds/sky/rh and apprnt temp grids based on current obs but no major changes planned to current forecast attm. 7AM UPDATE... Still some areas of fog as the sun has started its initial mixing. Will hold on to the Dense Fog Advisory for a bit longer. ORIGINAL DISCUSSION... Upper level trough over the Great Lakes today will send an embedded shortwave trough northeast across New York and northern New England. With a warm, humid air mass in place across the area, we should see showers and thunderstorms forming in the late morning to early afternoon, mainly over western New England and possibly the higher terrain of New Hampshire and northwest Maine. A southerly wind flow in the lowest level will keep a cooling influence over the coastal plain of Maine (where dense fog continues through early morning). This will limit the surface-based instability here, keeping any convective activity mainly to the north and west. Winds aloft increase out of the south southwest up to about 40 KT at 500MB. This gives us some moderate wind shear with some turning of the winds as well. As a result, storms that do form could take the form of multicell clusters and a few supercells. Damaging winds would be the primary severe weather threat, though heavy rain will again be possible. With the steering flow out of the SSW roughly parallel to the frontal boundary, some training storms will be possible, increasing the flash flooding threat. && .SHORT TERM /6 PM THIS EVENING THROUGH 6 PM SATURDAY/... The frontal boundary slowly moves into the area tonight, with showers and storms having already formed along it and moving east into New Hampshire and Maine overnight. Expect overall convective coverage to decrease overnight with the loss of surface-based instability. However, should still see some showers and storms maintaining themselves overnight. Fog may again form along the Midcoast overnight. The front finally moves into and through the area on Saturday, with an increase in coverage of showers and thunderstorms with the addition of daytime heating. && .LONG TERM /SATURDAY NIGHT THROUGH THURSDAY/... Any remaining convection will move offshore diminish quickly Saturday night into early Sunday morning with high pressure nudging in behind it. Dense fog will be a concern once again, especially where it rained in the previous 24 hours, as dew points begin to drop. Overnight temperatures will dip towards the upper 50s in the mountains and the mid 60s along the coast. A short wave trough will continue moving offshore Sunday into Monday morning. Ridging builds in along the East Coast as the mean trough digs into the central and southeastern CONUS by mid week. A couple systems will bring weather to New England during the work week, but for the most part it looks like a quiet and seasonable period of weather. High pressure and west winds at the surface will keep skies sunny and low relative humidities in place initially during the day Sunday and Monday, with temperatures in the upper 70s to lower to mid 80s...with southern NH and southwest ME making a run towards 87 or so. Southerly flow intensifies as a warm front lifts north on Wednesday, making for more of a cloudy and muggy day with slightly warmer temperatures south of the boundary. Instability associated with this warm front and the attendant short wave should be enough for some scattered stronger storms in the afternoon and evening hours. A couple of frontal boundaries will swing through towards the end of the week, bringing additional chances for rain and thunderstorms. && .AVIATION /14Z FRIDAY THROUGH TUESDAY/... Short Term...Early morning fog along the coastal plain of Maine should burn off by mid morning. Rockland may hold on to the low clouds into the early afternoon, with fog possibly moving back in tonight there. Meanwhile, some scattered showers and thunderstorms will form over western New England and may impact western New Hampshire during the evening hours. The threat area for thunderstorms moves eastward overnight and into Saturday. Long Term...Expect mostly VFR through Tuesday. MVFR/IFR ceilings should clear out in the evening Saturday as showers and thunderstorms come to an end. LIFR conditions in dense fog is likely however Saturday night into Sunday morning. && .MARINE... Short Term...Long period swell is diminishing to at or below 5 FT, so the Small Craft Advisory has been dropped. Fog will continue to be possible mainly over the cold near-coastal waters just off the Midcoast right through Saturday. Long Term...Fog, dense at times, will continue to be possible over the waters, especially Saturday night into Sunday morning. && .GYX WATCHES/WARNINGS/ADVISORIES... ME...None. NH...None. MARINE...None. &&
Hazardous Weather Outlook National Weather Service Gray ME 132 PM EDT Fri Jul 27 2018 MEZ007-008-012-013-018>020-023-024-NHZ001>015-281745- Northern Oxford-Northern Franklin-Southern Oxford-Southern Franklin- Interior York-Interior Cumberland-Androscoggin-Coastal York- Coastal Cumberland-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- 132 PM EDT Fri Jul 27 2018 ...SEVERE THUNDERSTORM WATCH 313 IN EFFECT UNTIL 10 PM EDT THIS EVENING... This Hazardous Weather Outlook is for Maine, southwest Maine, western Maine, New Hampshire, central New Hampshire, northern New Hampshire and southern New Hampshire. .DAY ONE...This Afternoon and Tonight. Please listen to NOAA Weather Radio or go to weather.gov on the Internet for more information about the following hazards. Severe Thunderstorm Watch. .DAYS TWO THROUGH SEVEN...Saturday through Thursday. 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. MEZ009-014-021-022-025>028-281745- Central Somerset-Southern Somerset-Kennebec-Interior Waldo-Sagadahoc- Lincoln-Knox-Coastal Waldo- 132 PM EDT Fri Jul 27 2018 This Hazardous Weather Outlook is for south central Maine and west central Maine. .DAY ONE...This Afternoon and Tonight. Isolated strong to severe thunderstorms are possible through 10pm this evening. The primary threats are damaging winds and heavy rainfall. .DAYS TWO THROUGH SEVEN...Saturday through Thursday. 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>154-281745- 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- 132 PM EDT Fri Jul 27 2018 This Hazardous Weather Outlook is for Atlantic coastal waters. .DAY ONE...This Afternoon and Tonight. A few thunderstorms are possible over the waters this evening. .DAYS TWO THROUGH SEVEN...Saturday through Thursday. 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. ARNOTT
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</html>Special Weather Statement
National Weather Service Gray ME
1253 PM EDT FRI JUL 27 2018
NHZ002-271745-
Southern Coos-
1253 PM EDT FRI JUL 27 2018
...A STRONG THUNDERSTORM WILL AFFECT SOUTHERN COOS COUNTY...
At 1253 PM EDT, a strong thunderstorm was located near Gilman, or
near Bethlehem, moving northeast at 25 mph.
Winds in excess of 40 mph...torrential rains and half inch hail are
possible with this storm.
Locations impacted include...
Berlin, Lancaster, Bethlehem, Carroll, Gorham, Dalton, Whitefield,
Randolph, Stark and Northumberland.
This also includes...
Moose Brook State Park and Mount Cabot.
Torrential rainfall is also occurring with this storm, and may cause
localized flooding. Do not drive your vehicle through flooded
roadways.
Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.
LAT...LON 4461 7145 4440 7118 4430 7159 4433 7167
4433 7170 4435 7171
TIME...MOT...LOC 1653Z 231DEG 21KT 4436 7161
ARNOTTSpecial Weather Statement
National Weather Service Gray ME
121 PM EDT FRI JUL 27 2018
NHZ007-011-271800-
Cheshire-Sullivan-
121 PM EDT FRI JUL 27 2018
...A LINE OF STRONG THUNDERSTORMS WILL AFFECT CHESHIRE COUNTY...
At 121 PM EDT, radar indicated strong thunderstorms were located
along a line extending from near Chesterfield to near Hinsdale.
Movement was northeast at 20 mph.
Winds in excess of 40 mph...torrential downpours and pea size hail
are possible with these storms.
Locations impacted include...
Keene, Jaffrey, Winchester, Dublin, Richmond, Harrisville, Nelson,
Marlborough, Gilsum, Hinsdale, Roxbury, Fitzwilliam, Troy, Sullivan,
Westmoreland, Swanzey, Surry, Chesterfield, Marlow and Alstead.
This also includes...
Mount Monadnock.
Torrential rainfall is also occurring with these storms, and may
cause localized flooding. Do not drive your vehicle through flooded
roadways.
Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.
LAT...LON 4292 7252 4295 7253 4297 7248 4298 7246
4300 7246 4300 7244 4303 7246 4312 7224
4313 7204 4272 7211 4273 7246 4277 7249
4277 7252 4278 7251 4281 7254 4287 7256
TIME...MOT...LOC 1721Z 245DEG 15KT 4292 7247 4276 7246
ARNOTTSpecial Weather Statement
National Weather Service Gray ME
149 PM EDT FRI JUL 27 2018
MEZ009-271830-
Central Somerset-
149 PM EDT FRI JUL 27 2018
...A STRONG THUNDERSTORM WILL AFFECT NORTH CENTRAL SOMERSET COUNTY...
At 148 PM EDT, a strong thunderstorm was located near Seboomook, or
25 miles northeast of Jackman, moving east at 35 mph.
Winds in excess of 40 mph...torrential rain...and half inch hail are
possible with this storm.
Locations impacted include...
Seboomook, Soldiertown, Pittston Academy Grant, Plymouth, Comstock
and Tomhegan.
Torrential rainfall is also occurring with this storm, and may cause
localized flooding. Do not drive your vehicle through flooded
roadways.
Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.
LAT...LON 4587 6965 4585 6968 4588 6971 4587 6972
4584 6970 4583 6972 4581 6971 4578 6973
4576 6973 4576 6977 4577 6978 4576 6979
4577 7001 4596 7008 4597 7004 4598 6968
TIME...MOT...LOC 1748Z 259DEG 30KT 4585 6984
ARNOTTSpecial Weather Statement
National Weather Service Gray ME
215 PM EDT FRI JUL 27 2018
NHZ007-271900-
Sullivan-
215 PM EDT FRI JUL 27 2018
...A STRONG THUNDERSTORM WILL AFFECT SOUTHWESTERN SULLIVAN COUNTY...
At 215 PM EDT, a strong thunderstorm was located over Charlestown, or
near Bellows Falls, moving northeast at 15 mph.
Winds in excess of 40 mph and half inch hail are possible with this
storm.
Locations impacted include...
Claremont, Charlestown, Springfield, Lempster, Acworth, Langdon and
Unity.
Torrential rainfall is also occurring with this storm, and may cause
localized flooding. Do not drive your vehicle through flooded
roadways.
Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.
LAT...LON 4318 7244 4319 7245 4320 7244 4323 7243
4325 7244 4327 7242 4331 7240 4334 7241
4335 7240 4339 7232 4322 7221 4316 7245
4317 7245
TIME...MOT...LOC 1815Z 232DEG 14KT 4321 7247
mleThe Burlington radar (KCXX), 137 km away, was scanning. The volume nearest the first event began at 18:20 UTC.
2 thunderstorm wind. Local standard time, as filed.
A severe thunderstorm downed trees and power lines in Grantham.
A severe thunderstorm downed trees and wires in Charlestown.
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: 775300, 775301.