A short wave trough moving across southern Canada provided broad scale ascent and instability which led to the development of thunderstorms in the afternoon. Strong winds aloft (>50KT at 700mb) provided enough shear for organization and primarily a wind threat.
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 short wave trough moving across southern Canada provided broad scale ascent and instability which led to the development of thunderstorms in the afternoon. Strong winds aloft (>50KT at 700mb) provided enough shear for organization and primarily a wind threat. There were numerous reports of wind damage from bow echoes and one supercell that moved through York County.
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 24, 9:18 AM EST, 4 hours 17 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE GRAY ME 1018 AM EDT THU JUN 24 2010 .SYNOPSIS... LOW PRESSURE WILL MOVE ACROSS SOUTHERN CANADA TODAY WITH A COLD FRONT PASSING THROUGH NEW ENGLAND. HIGH PRESSURE BUILDS BEHIND THE FRONT FOR FRIDAY. ANOTHER COLD FRONT WILL PASS THROUGH THE REGION LATE SATURDAY AND SATURDAY NIGHT. A BROAD AREA OF LOW PRESSURE WILL TRY TO DEVELOP OVER THE REGION EARLY NEXT WEEK. && .NEAR TERM /UNTIL 6 PM THIS EVENING/... 10AM UPDATE... DID NOT MAKE MANY CHANGES TO THE CURRENT FORECAST. RAIN SPREADING INTO NORTHERN NEW HAMPSHIRE NOW WILL CROSS MOST OF MAINE LATE THIS MORNING. THIS MAY LIMIT SEVERE THUNDERSTORM POTENTIAL BY DECREASING THE INSTABILITY. THE BEST CHANCE AT SEVERE THUNDERSTORM POTENTIAL WILL BE ACROSS SOUTHERN NEW HAMPSHIRE WHERE THERE HAS BEEN MORE CLEARING AND THESE MORNING SHOWERS HAVE NOT HAD SUCH A NEGATIVE IMPACT. PREVIOUS DISCUSSIONS FOLLOW.. SURFACE LOW TRACKING THROUGH THE SAINT LAWRENCE RIVER VALLEY NEAR MONTREAL AT THIS HOUR AND WILL CONTINUE NORTHEASTWARD THROUGH THE DAY. SOME SHOWERS WERE ASSOCIATED WITH THIS LOW ACROSS NORTHERN VERMONT AND NEW HAMPSHIRE AND THE WESTERN MAINE MOUNTAINS. FARTHER UPSTREAM A SHORTWAVE WAS CARVING ACROSS THE UPPER GREAT LAKES AND HAD PRODUCED SIGNIFICANT CONVECTION ACROSS THE UPPER MIDWEST LAST EVENING. THIS SHORTWAVE WILL TRACK ACROSS NEW ENGLAND THIS AFTERNOON AND BRING A SEVERE WEATHER THREAT TO OUR AREA. PLENTY OF UNIDIRECTIONAL SHEAR IS PRESENT ALOFT AND STRENGTHENING THROUGH THE DAY. THE LIMITING FACTOR APPEARS TO BE INSTABILITY. A WHOLE LOT OF CONVECTIVE DEBRIS CLOUD IS APPROACHING FROM THE WEST AT THIS HOUR AND SHOULD LIMIT INSOLATION FOR SEVERAL HOURS THIS MORNING. WE DO EXPECT BREAKS TO DEVELOP IN SOUTHERN AND CENTRAL NEW HAMPSHIRE AND SOUTHERN MAINE LATE MORNING INTO MIDDAY...WHICH SHOULD ALLOW TEMPERATURES TO DIP INTO THE 80S AND PROVIDE THE NECESSARY INSTABILITY FOR INITIATION AND ORGANIZATION OF THUNDERSTORMS. DESPITE LESS THAN IDEAL INSTABILITY...SHEAR PROFILE IS A CLASSIC SETUP FOR DAMAGING STRAIGHT-LINE WINDS...BUT AN ISOLATED TORNADO IS NOT OUT OF THE QUESTION TODAY EITHER. PRECIPITABLE WATER VALUES RANGING FROM 1.5 TO 1.75 INCHES THIS AFTERNOON WILL LEAD TO HEAVY DOWNPOURS WITH ANY SHOWERS AND THUNDERSTORMS. ANTECEDENT CONDITIONS ARE NOT IDEAL FOR FLASH FLOODING...AND NEITHER WILL THUNDERSTORM MOTION TODAY AS EXPECTED SPEEDS WILL BE 40-50 MPH. ACTIVITY SHOULD BEGIN TO TAIL OFF AFTER 21 UTC AS DRYING AND MORE STABLE AIR BEGINS TO INVADE NORTHERN NEW ENGLAND FROM WEST TO EAST. && .SHORT TERM /6 PM THIS EVENING THROUGH 6 AM FRIDAY/... EXPECT RAPIDLY CLEARING SKIES AFTER SUNSET THIS EVENING WITH ONLY A CHANCE OF SHOWERS EAST OF AUGUSTA INTO MID-EVENING. HIGH PRESSURE BEHIND THE COLD FRONT WILL CONTINUE TO ADVANCE TOWARD NEW ENGLAND OVERNIGHT. && .LONG TERM /FRIDAY THROUGH WEDNESDAY/... GENERALLY A FAST MOVING UPPER FLOW FOR THIS TIME OF YEAR AND WILL CONTINUE THROUGH THE WEEK SO EXPECT FREQUENT CHANGES IN CONDITIONS. WE BEGIN WITH HIGH PRES THAT WILL BUILD OVER THE REGION FRI AND FRI NIGHT WITH GENERALLY SUNNY CONDS AND LOW HUMIDITIES FRIDAY...THIS HIGH WILL THEN MOVE OFF TO THE E. A WEAK FRONT WILL DROP S ACROSS THE AREA SAT SETTING OFF SOME SHWRS THAT WILL DRIFT S ACROSS THE FA FM N-S IN THE AFTN AND EVNG. ON SUNDAY A WK RDG OF HIGH PRES WILL ALLOW A BRIEF PERIOD OF FAIR WX BEFORE THE NEXT SYSTEM APPROACHES SUN NIGHT AND MON WITH MORE UNSETTLED WX. TIMING ON THE SYSTEM FOR SUN NIGHT AND MON HAS VARIED WITH THE MODELS SO TIMING MAY NEED SOME FUTURE ADJUSTMENTS. MODELS ARE SLOWER BRINGING IN SHWRS THAN PRIOR RUNS. BY MIDWEEK MODELS TRY TO DEVELOP A CLOSED UPPER LOW TO THE W OF NEW ENGL AND THEN DRIFT IT EWD...BUT WILL SEE HOW LATER MODEL RUNS HANDLE THINGS. TEMPERATURES WILL BE MOSTLY NEAR SEASONAL LEVELS THROUGH THE PERIOD. && .AVIATION /14Z THURSDAY THROUGH MONDAY/... SHORT TERM...AREAS OF MVFR/IFR CONDITIONS DUE TO FOG EARLY THIS MORNING...THEN VFR CEILINGS TODAY WITH LOCAL IFR CONDITIONS IN ANY THUNDERSTORMS. CONDITIONS TRANSITION TO VFR CLEAR TONIGHT BEHIND THE LATE AFTERNOON COLD FRONTAL PASSAGE. LONG TERM...MAINLY VFR EXCEPT MVFR CONDS IN ANY SHWRS SAT AFTN. MVFR TO IFR CONDS PSBL EARLY NEXT WEEK. && .MARINE... SHORT TERM...ASIDE FROM STRONG THUNDERSTORMS THIS AFTERNOON WHICH COULD MAKE FOR LOCALLY DANGEROUS CONDITIONS...THE COASTAL WATERS SHOULD REMAIN BELOW SMALL CRAFT CONDITIONS TODAY AND TONIGHT. LONG TERM...NO FLAGS. && .GYX WATCHES/WARNINGS/ADVISORIES... ME...NONE. NH...NONE. MARINE...NONE. && SYNOPSIS... NEAR TERM... SHORT TERM... LONG TERM... AVIATION... MARINE...
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE GRAY ME 452 AM EDT THU JUN 24 2010 MEZ007>009-NHZ001>003-250900- NORTHERN OXFORD-NORTHERN FRANKLIN-CENTRAL SOMERSET-NORTHERN COOS- SOUTHERN COOS-NORTHERN GRAFTON- 452 AM EDT THU JUN 24 2010 THIS HAZARDOUS WEATHER OUTLOOK IS FOR WESTERN MAINE AND NORTHERN NEW HAMPSHIRE. .DAY ONE...TODAY AND TONIGHT THUNDERSTORMS ARE LIKELY...ESPECIALLY THIS AFTERNOON...ACROSS NORTHERN NEW HAMPSHIRE AND THE WESTERN MAINE MOUNTAINS. THE PRIMARY THREATS FROM THESE THUNDERSTORMS WILL BE STRONG GUSTY WINDS...HEAVY DOWNPOURS AND LIGHTNING. CLEARING IS EXPECTED THIS EVENING. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE NEEDED. SPOTTERS ARE ENCOURAGED TO CALL OR RADIO IN THEIR REPORTS. MEZ012>014-018>028-NHZ004>010-013-014-250900- SOUTHERN OXFORD-SOUTHERN FRANKLIN-SOUTHERN SOMERSET-INTERIOR YORK- INTERIOR CUMBERLAND-ANDROSCOGGIN-KENNEBEC-INTERIOR WALDO- COASTAL YORK-COASTAL CUMBERLAND-SAGADAHOC-LINCOLN-KNOX-COASTAL WALDO- NORTHERN CARROLL-SOUTHERN GRAFTON-SOUTHERN CARROLL-SULLIVAN- MERRIMACK-BELKNAP-STRAFFORD-INTERIOR ROCKINGHAM-COASTAL ROCKINGHAM- 452 AM EDT THU JUN 24 2010 THIS HAZARDOUS WEATHER OUTLOOK IS FOR WESTERN MAINE...CENTRAL NEW HAMPSHIRE...NORTHERN NEW HAMPSHIRE AND SOUTHEASTERN NEW HAMPSHIRE. .DAY ONE...TODAY AND TONIGHT THUNDERSTORMS ARE LIKELY...ESPECIALLY THIS AFTERNOON...ACROSS SOUTHERN AND CENTRAL NEW HAMPSHIRE AND SOUTHWESTERN AND SOUTH CENTRAL MAINE. SOME OF THESE THUNERSTORMS COULD PRODUCE SEVERE WEATHER IN THE FORM OF DAMAGING STRAIGHT-LINE WINDS AND POSSIBLY AN ISOLATED TORNADO. THESE STORMS WILL ALSO PRODUCE HEAVY DOWNPOURS AND LIGHTNING. CLEARING IS EXPECTED THIS EVENING. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY 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>154-250900- 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- 452 AM EDT THU JUN 24 2010 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...TODAY AND TONIGHT THUNDERSTORMS ARE LIKELY...ESPECIALLY THIS AFTERNOON...ACROSS THE COASTAL WATERS OF NEW HAMPSHIRE AND MAINE. THE PRIMARY THREATS FROM THESE THUNDERSTORMS WILL BE STRONG GUSTY WINDS...HEAVY DOWNPOURS AND LIGHTNING. CLEARING IS EXPECTED THIS EVENING. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE NEEDED. SPOTTERS ARE ENCOURAGED TO CALL OR RADIO IN THEIR REPORTS. STJEAN...NWS GRAY/PORTLAND ME
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE GRAY ME 1236 PM EDT THU JUN 24 2010 NHZ003-241700- NORTHERN GRAFTON- 1236 PM EDT THU JUN 24 2010 ...STRONG THUNDERSTORM WILL IMPACT GRAFTON COUNTY THROUGH 100 PM EDT... AT 1235 PM EDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A STRONG THUNDERSTORM CENTERED 2 MILES EAST OF WOODSVILLE...MOVING EAST AT 35 MPH. THIS STRONG THUNDERSTORM WILL AFFECT AREAS IN AND AROUND WOODSVILLE...LISBON...LANDAFF CENTER...BENTON...BATH...SUGAR HILL... EASTON...FRANCONIA AND FRANCONIA NOTCH STATE PARK THROUGH 100 PM EDT. VERY HEAVY DOWNPOURS AND GUSTY WINDS OF 35 TO 45 MPH CAN BE EXPECTED. LAT...LON 4425 7147 4406 7140 4409 7204 4424 7205 MC
The Portland,ME radar (KGYX), 52 km away, was scanning. The volume nearest the first event began at 18:33 UTC.
7 thunderstorm wind. Local standard time, as filed.
A severe thunderstorm downed trees and flipped over a large tent in Lyman.
A severe thunderstorm downed several trees in Eliot.
A severe thunderstorm downed trees on Ferry Road and Bradley Street in Saco.
A severe thunderstorm downed trees in Biddeford.
Severe thunderstorm winds damaged sections of the town of york where winds were estimated to have gusted between 80 and 90 mph at around 7 pm Thursday evening, June 24. Several thousand large trees were snapped or uprooted by the storm and between 40 and 50 utility poles were snapped by the falling trees. In addition, houses, buildings and vehicles were damaged by falling trees and branches.
A severe thunderstorm downed numerous trees in Eliot.
A severe thunderstorm downed trees in Kittery.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Maine in 2010Every state in 2010This day in weather historyWarnings in Maine, June 2010
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: 245993, 245994, 245991, 245992, 247117, 245995, 245996.