A shortwave trough and an associated cold front approached the forecast area on the afternoon of June 17th. Moderate to strong speed shear shifted into southern New Hampshire by mid afternoon as CAPE values peaked.
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 shortwave trough and an associated cold front approached the forecast area on the afternoon of June 17th. Moderate to strong speed shear shifted into southern New Hampshire by mid afternoon as CAPE values peaked. Several severe thunderstorms developed during the remainder of the afternoon with wind damage the main feature with these storms. Some small hail was also reported.
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 Jun 17, 2:12 PM EST, 3 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE GRAY ME 312 PM EDT MON JUN 17 2013 .SYNOPSIS... A COLD FRONT WILL PUSH SOUTHEAST ACROSS NEW ENGLAND TONIGHT THEN STALL TO OUR SOUTH ON TUESDAY. WEAK LOW PRESSURE WILL TRACK TO THE NORTHEAST ALONG THE FRONT TUESDAY NIGHT...STAYING JUST BEYOND THE GULF OF MAINE. HIGH PRESSURE WILL BUILD EAST ACROSS THE REGION FOR WEDNESDAY AND THURSDAY. A WEAK COLD FRONT WILL DROP SOUTH ACROSS THE AREA FRIDAY. A SERIES OF WEAK DISTURBANCES WILL RACE EASTWARD AND BRING MILD BUT UNSETTLED WEATHER TO THE AREA FOR THE UPCOMING WEEKEND AND EARLY NEXT WEEK. && .NEAR TERM /UNTIL 6 AM TUESDAY MORNING/... A COLD FRONT PUSHES SOUTHEAST ACROSS THE FORECAST AREA TONIGHT WITH SHOWERS AND SCATTERED THUNDERSTORMS AHEAD OF THE FRONT. THE SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT THROUGH 9 PM THIS EVENING FOR OUR THREE SOUTHERN MOST NEW HAMPSHIRE COUNTIES. ELSEWHERE CONVECTION WON'T BE NEARLY AS STRONG AS INSTABILITY IS MUCH LOWER. NOT MUCH DIRECTIONAL SHEAR BUT FAIRLY STRONG SPEED SHEAR WITH WESTERLY WINDS FAIRLY STRONG ALOFT. THIS COULD PRODUCE ISOLATED SHORT LINES AND BOW ECHOES TO PRODUCE STRONG/POSSIBLY DAMAGING WIND GUSTS. SOME HAIL POSSIBLE...GETTING REPORTS OF PEA SIZE HAIL IN SOUTHERN NEW HAMPSHIRE. AS THE EVENING WEARS ON THE CONVECTION SHOULD END OR AT LEAST DROP OFF DRAMATICALLY. PATCHY FOG WILL FORM...ESPECIALLY IN AREAS THAT SEE RAINFALL. LOWS TONIGHT RANGE FROM THE 40S NORTH TO THE 50S SOUTH AS WINDS DROP OFF DURING THE EVENING HOURS AND REMAIN FAIRLY LIGHT FOR THE REST OF THE NIGHT. && .SHORT TERM /6 AM TUESDAY MORNING THROUGH TUESDAY NIGHT/... THE SLOW MOVING FRONT SETTLES JUST TO OUR SOUTH AS AN UPPER LEVEL DISTURBANCE RIDES EASTWARD ALONG THE BOUNDARY ON TUESDAY. THIS WILL PROVIDE A CHANCE OF SHOWERS AND THUNDERSTORMS OVER SOUTHERN ZONES WHILE OUR NORTHERN ZONES WILL BE A BIT TOO FAR NORTH TO BE IMPACTED BY THESE SYSTEMS AND ARE EXPECTED TO BE MOSTLY DRY. WEAK LOW PRESSURE MOVES TO THE NORTHEAST ALONG THE FRONT TUESDAY NIGHT BRINGING AN END TO ANY RAIN OVER SOUTHERN ZONES. ON TUESDAY THE CLOUDS AND SHOWERS WILL KEEP TEMPERATURES COOLER SOUTH WHILE COOLER AIR COMING IN FROM THE NORTH BEHIND THE FRONT WILL HOLD TEMPERATURES DOWN SOME IN THE NORTH. OVERALL EXPECT HIGHS ON TUESDAY IN THE MID 60S TO MID 70S. TUESDAY NIGHT SHOULD SEE SLOWLY IMPROVING WEATHER WITH TEMPERATURES COOLING OFF INTO THE LOWER TO MID 40S NORTH AND UPPER 40S TO LOWER 50S SOUTH. && .LONG TERM /WEDNESDAY THROUGH MONDAY/... THE MODELS ARE IN DECENT AGREEMENT THROUGH FRIDAY ON LONGWAVE PATTERN BEFORE DIFFERENCES ARISE. THE GFS SHIFTS THE RIDGE AXIS EAST INTO NEW ENGLAND BY SATURDAY WHILE THE ECMWF KEEPS THE RIDGE AXIS THROUGH THE GREAT LAKES WITH BROAD TROUGHING ACROSS THE FORECAST AREA. WHILE DIFFERENCES EXIT IN THE LONGWAVE SOLUTION...THE MODEL SUITE DOES ADVERTISE A MEAN JET LOCATION NEAR THE INTERNATIONAL BORDER WHICH ALSO SERVES TO INCREASE FORECAST UNCERTAINTY FROM THIS WEEKEND AND BEYOND. A BLEND OF ECMWF AND GFS SUGGESTS TEMPERATURES SHOULD AVERAGE NEAR TO SLIGHTLY ABOVE NORMAL FOR MUCH OF THE PERIOD. IN THE DAILIES...HIGH PRESSURE WILL BUILD EAST ACROSS THE REGION FOR WEDNESDAY AND THURSDAY. A WEAK COLD FRONT WILL DROP SOUTH ACROSS THE AREA FRIDAY. A SERIES OF WEAK DISTURBANCES WILL RACE EASTWARD AND BRING MILD BUT UNSETTLED WEATHER TO THE AREA FOR THE UPCOMING WEEKEND AND EARLY NEXT WEEK. && .AVIATION /19Z MONDAY THROUGH SATURDAY/... SHORT TERM /THROUGH TUESDAY NIGHT/...VARIABLE CONDITIONS IN SHOWERS AND THUNDERSTORMS THIS EVENING THEN VFR EXCEPT FOR AREAS OF FOG LOWERING TO IFR OR MAYBE LOCALLY TO LIFR. VFR ON TUESDAY WITH POSSIBLE MVFR OR IFR DEVELOPING IN SOUTHERN AREAS THEN IMPROVING AGAIN TUESDAY NIGHT. LONG TERM... FRI...SCT MVFR POSSIBLE IN SHOWERS AND THUNDERSTORMS. && .MARINE... SHORT TERM /TONIGHT THROUGH TUESDAY NIGHT/...SOUTHWESTERLY WINDS AHEAD OF THE FRONT MAY GUST UP TO 20 KNOTS WITH SEAS AS HIGH AS 4 FEET THROUGH THIS EVENING THEN WINDS SHIFT TO THE NORTHWEST LATER TONIGHT THROUGH TUESDAY AND INTO TUESDAY NIGHT BEHIND A SLOW MOVING COLD FRONT. SEAS WILL SLOWLY LOWER AS WINDS TURN OFFSHORE. EXPECT THAT WINDS AND SEAS REMAIN BELOW SMALL CRAFT ADVISORY LEVELS THROUGH TUESDAY NIGHT. LONG TERM... WINDS AND SEAS ARE EXPECTED TO REMAIN BELOW SMALL CRAFT THRESHOLD. && .GYX WATCHES/WARNINGS/ADVISORIES... ME...NONE. NH...NONE. MARINE...NONE. &&
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE GRAY ME 125 PM EDT MON JUN 17 2013 MEZ007>009-012>014-018>028-NHZ001>006-009-010-181730- 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-BELKNAP-STRAFFORD- 125 PM EDT MON JUN 17 2013 THIS HAZARDOUS WEATHER OUTLOOK IS FOR WESTERN MAINE...CENTRAL NEW HAMPSHIRE AND NORTHERN NEW HAMPSHIRE. .DAY ONE...THIS AFTERNOON AND TONIGHT. SCATTERED SHOWERS AND THUNDERSTORMS ARE EXPECTED THIS AFTERNOON. THERE IS THE POSSIBILITY THAT A FEW STORMS COULD PRODUCE SMALL HAIL AND GUSTY WINDS. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY. NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL LIKELY BE NEEDED. SPOTTERS ARE ENCOURAGED TO CALL OR RADIO IN THEIR REPORTS. NHZ007-008-013-014-181730- SULLIVAN-MERRIMACK-INTERIOR ROCKINGHAM-COASTAL ROCKINGHAM- 125 PM EDT MON JUN 17 2013 ...SEVERE THUNDERSTORM WATCH 321 IN EFFECT UNTIL 9 PM EDT THIS EVENING... THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL NEW HAMPSHIRE AND SOUTHEASTERN 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...TUESDAY THROUGH SUNDAY. NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL LIKELY BE NEEDED. SPOTTERS ARE ENCOURAGED TO CALL OR RADIO IN THEIR REPORTS. ANZ150>154-181730- STONINGTON ME TO PORT CLYDE ME OUT TO 25 NM-PENOBSCOT BAY- PORT CLYDE ME TO CAPE ELIZABETH ME OUT TO 25 NM-CASCO BAY- CAPE ELIZABETH ME TO MERRIMACK RIVER MA OUT TO 25 NM- 125 PM EDT MON JUN 17 2013 THIS HAZARDOUS WEATHER OUTLOOK IS FOR CASCO BAY...PENOBSCOT BAY...THE COASTAL WATERS FROM CAPE ELIZABETH ME TO MERRIMACK RIVER MA...THE COASTAL WATERS FROM PORT CLYDE ME TO CAPE ELIZABETH ME AND THE COASTAL WATERS FROM STONINGTON ME TO PORT CLYDE ME. .DAY ONE...THIS AFTERNOON AND TONIGHT. NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY. NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL LIKELY BE NEEDED. SPOTTERS ARE ENCOURAGED TO CALL OR RADIO IN THEIR REPORTS.
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE GRAY ME
222 PM EDT MON JUN 17 2013
NHZ007-008-171900-
MERRIMACK-SULLIVAN-
222 PM EDT MON JUN 17 2013
...A STRONG THUNDERSTORM WILL IMPACT SULLIVAN COUNTY AND MERRIMACK
COUNTY THROUGH 300 PM EDT...
AT 220 PM EDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM CENTERED 6 MILES NORTHWEST OF CLAREMONT...MOVING
EAST AT 35 MPH. THIS STRONG THUNDERSTORM WILL AFFECT AREAS IN AND
AROUND CORNISH...CLAREMONT...CORNISH FLAT...NEWPORT...CROYDON...
SUNAPEE...GRANTHAM...JOHN HAY NATIONAL WILDLIFE REFUGE...SPRINGFIELD
AND NEW LONDON THROUGH 300 PM EDT.
STRONG GUSTY WINDS OF 35 TO 45 MPH ARE POSSIBLE IN THE PATH OF THIS
STORM.
HEAVY RAINFALL CAN BE EXPECTED...WITH LOCAL PONDING IN STREETS AND
LOW-LYING AREAS.
IF YOU ARE OUTDOORS AND STORMS APPROACH YOUR LOCATION...MOVE INDOORS
OR INSIDE A VEHICLE. REMEMBER...LIGHTNING CAN STRIKE MORE THAN 5
MILES AWAY FROM THE PARENT THUNDERSTORM.
LAT...LON 4339 7241 4341 7241 4342 7240 4349 7239
4350 7239 4354 7186 4331 7183 4336 7242
4338 7243
MARINESPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE GRAY ME 240 PM EDT MON JUN 17 2013 NHZ007-008-171930- MERRIMACK-SULLIVAN- 240 PM EDT MON JUN 17 2013 ...STRONG THUNDERSTORMS WILL IMPACT SULLIVAN COUNTY AND MERRIMACK COUNTY THROUGH 330 PM EDT... AT 239 PM EDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A CLUSTER OF STRONG THUNDERSTORMS CENTERED 5 MILES NORTHWEST OF NEWPORT...OR ABOUT 4 MILES EAST OF CLAREMONT...MOVING EAST AT 35 MPH. THIS CLUSTER OF STRONG THUNDERSTORMS WILL AFFECT AREAS IN AND AROUND CROYDON...NEWPORT...GOSHEN...SUNAPEE...MOUNT SUNAPEE STATE PARK... JOHN HAY NATIONAL WILDLIFE REFUGE...NEWBURY...NEW LONDON...WILMOT AND BRADFORD THROUGH 330 PM EDT. HAIL UP TO THREE QUARTER INCH IN DIAMETER...HEAVY DOWNPOURS... EXCESSIVE CLOUD-TO-GROUND LIGHTNING AND GUSTY WINDS OF 45 TO 55 MPH CAN BE EXPECTED. IF YOU ARE OUTDOORS AND STORMS APPROACH YOUR LOCATION...MOVE INDOORS OR INSIDE A VEHICLE. REMEMBER...LIGHTNING CAN STRIKE MORE THAN 5 MILES AWAY FROM THE PARENT THUNDERSTORM. LAT...LON 4345 7167 4320 7173 4332 7234 4349 7229 MARINE
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE GRAY ME 247 PM EDT MON JUN 17 2013 MEZ021-022-028-171930- COASTAL WALDO-INTERIOR WALDO-KENNEBEC- 247 PM EDT MON JUN 17 2013 ...STRONG THUNDERSTORMS WILL IMPACT KENNEBEC COUNTY AND WALDO COUNTY THROUGH 330 PM EDT... AT 247 PM EDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A CLUSTER OF STRONG THUNDERSTORMS CENTERED 2 MILES NORTHEAST OF CHINA...OR ABOUT 7 MILES SOUTHEAST OF WATERVILLE...MOVING EAST AT 30 MPH. THIS CLUSTER OF STRONG THUNDERSTORMS WILL AFFECT AREAS IN AND AROUND CHINA...ALBION...THORNDIKE...LIBERTY...FREEDOM...MONTVILLE... KNOX...MORRILL...JACKSON AND BROOKS THROUGH 330 PM EDT. HAIL UP TO THREE QUARTER INCH IN DIAMETER...HEAVY DOWNPOURS... EXCESSIVE CLOUD-TO-GROUND LIGHTNING AND GUSTY WINDS OF 45 TO 55 MPH CAN BE EXPECTED. LAT...LON 4463 6899 4435 6901 4441 6954 4459 6954 MARINE
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE GRAY ME
304 PM EDT MON JUN 17 2013
MEZ019-020-024-171930-
ANDROSCOGGIN-COASTAL CUMBERLAND-INTERIOR CUMBERLAND-
304 PM EDT MON JUN 17 2013
...STRONG THUNDERSTORMS WILL IMPACT ANDROSCOGGIN COUNTY AND
CUMBERLAND COUNTY THROUGH 330 PM EDT...
AT 303 PM EDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
CLUSTER OF STRONG THUNDERSTORMS CENTERED 4 MILES SOUTH OF POLAND...OR
ABOUT 7 MILES SOUTH OF MECHANIC FALLS...MOVING EAST AT 30 MPH. THIS
CLUSTER OF STRONG THUNDERSTORMS WILL AFFECT AREAS IN AND AROUND RANGE
PONDS STATE PARK...POLAND...MINOT...NEW GLOUCESTER...BRADBURY
MOUNTAIN STATE PARK...LISBON...DURHAM AND LISBON FALLS THROUGH 330 PM
EDT.
HAIL UP TO ONE HALF INCH IN DIAMETER...HEAVY DOWNPOURS...EXCESSIVE
CLOUD-TO-GROUND LIGHTNING AND GUSTY WINDS OF 35 TO 45 MPH CAN BE
EXPECTED.
IF YOU ARE OUTDOORS AND STORMS APPROACH YOUR LOCATION...MOVE INDOORS
OR INSIDE A VEHICLE. REMEMBER...LIGHTNING CAN STRIKE MORE THAN 5
MILES AWAY FROM THE PARENT THUNDERSTORM.
LAT...LON 4389 7008 4392 7049 4409 7046 4410 7044
4407 7003
MARINEThe Boston radar (KBOX), 146 km away, was scanning. The volume nearest the first event began at 19:16 UTC.
5 thunderstorm wind. Local standard time, as filed.
A severe thunderstorm downed several large trees near Henniker.
A severe thunderstorm downed trees and wires on Deerfield road near Allenstown.
A severe thunderstorm downed a tree on a car on Islington Street in Portsmouth.
A severe thunderstorm downed trees on Portsmouth Avenue in Greenland.
A severe thunderstorm produced a measured gust of 62 mph at the Portsmouth International Airport ASOS.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in New Hampshire in 2013Every state in 2013This day in weather historyWarnings in New Hampshire, June 2013
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 2026-09-24. Each event’s entry at NCEI: 458687, 458688, 458689, 458690, 458693.