A cold front moved through from the Great Lakes the night of June 24th. This brought showers and thunderstorms with locally heavy downpours, with rainfall amounts up to 2 inches.
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The episode as NWS BOX wrote it up.
A cold front moved through from the Great Lakes the night of June 24th. This brought showers and thunderstorms with locally heavy downpours, with rainfall amounts up to 2 inches.
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 Boston/Norton, MA wrote its last area forecast discussion before the first event at Jun 24, 10:07 PM EST, 2 hours 23 minutes earlier.
Area Forecast Discussion National Weather Service Boston/Norton MA 1107 PM EDT Sun Jun 24 2018 .SYNOPSIS... A cold front will move across the region overnight and will be accompanied by scattered showers and a thunderstorm or two. Another disturbance will result in a continued risk of a shower or isolated t-storm across eastern MA and RI on Monday. High pressure and seasonably warm conditions follow for Tuesday and Wednesday, then a weak front will bring a chance of showers and t-storms for Thursday. There is a signal for a prolonged heat wave next weekend into early next week with the potential for dangerous heat and humidity. && .NEAR TERM /UNTIL 6 AM MONDAY MORNING/... 1040 PM Update... A line of showers and scattered thunderstorms moving slowly SE along the S coasts of Mass and RI as seen on latest KBOX and NE regional 88D radar imagery. The islands will see the brunt of the thunderstorms, with some locally heavy downpours as well as C/G lightning. The line of thunderstorms should weaken as it moves over the cooler ocean waters after about 04Z or so. Noting a second line of showers lies across the NH/Mass border, extending SE across southern Franklin and northern Hampshire counties into the Berkshires at 0240Z. This appears to be associated with the approaching cold front moving SE, especially on its western extent. May also see a few brief, heavy downpours with this front, though the instability has pushed SE with the leading area of precip along the S coast. Areas of dense fog also continue along the S coast and across the southern coastal waters, with a report of zero visibility from the Vineyard Ferry during its crossing at 01Z. As the cold front moves across from 06Z-07Z or so, should see improving visibility as winds shift to light W-NW bringing the drier air in. Dewpoints remain very high, mainly in the mid-upper 60s regionwide except a bit lower across the Cape and islands with the onshore wind off the cooler waters. So, expect the areas of dense fog to linger there as well as across the islands until the cold front crosses during the early morning hours. Have updated near term to bring conditions current. && .SHORT TERM /6 AM MONDAY MORNING THROUGH MONDAY NIGHT/... Monday... Fairly robust mid level trough and shortwave rotates south across SNE with -22C cold pool at 500 mb. Coldest air aloft and pocket of higher KI and TT focused across eastern half New Eng where best chance for a few showers developing and possibly an isold t-storm as models indicate a few hundred joules of CAPE. Certainly not a washout, but a few showers will be possible and given cold air aloft can't rule out some small hail. A mix of sun and clouds expected with most sunshine in the CT valley. Temps ranging from upper 60s/70 degrees east coastal MA with NE flow to upper 70s/near 80 degrees CT valley. A bit breezy with northerly winds gusting to 20-25 mph at times. Monday night... High pres builds into SNE from the west with clearing skies and diminishing wind. Decent radiational cooling will result in a chilly night with lows down into the 40s in the colder outlying areas, except 50s urban centers and milder coastal locations. && .LONG TERM /TUESDAY THROUGH SUNDAY/... Highlights... * Seasonable temperatures through Thu with chance of showers Wed night/Thu * Heat wave potential beginning next Friday/weekend Tuesday... Surface high pressure passes overhead bringing sunny skies, low humidity, and highs in the 70s. Mainly clear skies Tuesday night. However some increase in clouds is possible towards daybreak as the high moves offshore, and a low pressure system moves into the Great Lakes Region. Lows mainly in the 50s. Wednesday... Our region is in SW flow and eventual increasing moisture as the low pressure system continues pushing eastward thru the Great Lakes Region. Mainly dry weather is expected in our area during the day, with a slight chance of showers late across far western MA. Highs once again in the 70s. Wednesday night and Thursday... Low pressure center tracks into southern Quebec, while associated cold front tracks towards and thru southern New England. Showers and scattered thunderstorms expected over the course of Wed night into Thu. Moisture-rich airmass ahead of the front with surface dewpoints climbing into the 60s and possibly low 70s, so locally heavy downpours are possible. Cold front should push east of the region Thu night. Friday thru Sunday... Cold front moves offshore but increasing heat and humidity not far behind it, as models show a mid level ridge building into our region. Ensembles continue to indicate well above normal temperatures at 925 mb and 850 mb. This should mean well above normal temperatures at the surface as well, except for perhaps the Cape and islands where SW flow off the water will keep temperatures lower. The heat and humidity may persist into early in the following week. Heat Advisories will likely be needed, especially by Saturday. Also of note, in CPC's Risk of Hazardous Temperatures outlook (Experimental), southern New England is highlighted as having a moderate (40%) risk of excessive heat during 6/30 thru 7/3. For this CPC outlook, excessive heat is considered to include max temps of 95- 100 deg F with a max heat index of 105 deg F or greater. && .AVIATION /03Z MONDAY THROUGH FRIDAY/... Forecaster Confidence Levels... Low - less than 30 percent. Moderate - 30 to 60 percent. High - greater than 60 percent. Short Term /through Monday Night/... Overnight...Moderate confidence. Mainly MVFR-IFR CIGS with mainly VFR VSBYS except briefly lowering to MVFR in heavy showers across most areas. Will see improving conditions as the cold front passes, with winds shifting to light W-NW. Along the S coast, Cape Cod and the islands, expect mainly LIFR in areas of dense fog. Showers and sct TSTMs will move across through 05Z or so, then a brief break before another line of showers moves across during the early morning hours. LIFR will continue until the cold front passes around 09Z or so. Winds will shift to W-NW overnight as cold front swings around 11Z-12Z. Monday...High confidence. Mainly VFR. BKN cigs across eastern half New Eng where a few showers possible. IFR along the Cape and Islands gradually improves to VFR during the afternoon. Northerly wind gusts to 20 kt, and up to 25 kt Cape/Islands. Monday night...High confidence. VFR. Light winds. KBOS Terminal...Moderate confidence in TAF. KBDL Terminal...Moderate confidence in TAF. Outlook /Tuesday through Friday/...Moderate confidence. Tuesday through Tuesday Night: VFR. Wednesday: Mainly VFR, with local MVFR possible. Breezy. Wednesday Night: Mainly MVFR, with areas VFR possible. Breezy. Slight chance SHRA, slight chance TSRA. Thursday: MVFR. Breezy. Chance SHRA, slight chance TSRA. Thursday Night: Mainly MVFR, with areas VFR possible. Breezy. Chance SHRA, slight chance TSRA. Friday: VFR. && .MARINE... Forecaster Confidence Levels... Low - less than 30 percent. Moderate - 30 to 60 percent. High - greater than 60 percent. Short Term /through Monday Night/...High confidence. Light SW winds tonight becoming NW late. Increasing northerly winds Mon with a few gusts to 25 kt possible across eastern waters where seas may approach 5 ft. SCA may eventually be needed here. Diminishing wind/seas Mon night as high pres builds into the region. Poor vsbys tonight in developing fog south coastal waters. Scattered showers and possibly an isold t-storm this evening. Outlook /Tuesday through Friday/... Tuesday through Wednesday: Winds less than 25 kt. Wednesday Night: Winds less than 25 kt. Seas locally approaching 5 ft. Chance of rain showers. Thursday: Moderate risk for Small Craft Advisory winds with gusts up to 25 kt. Areas of rough seas. Chance of rain showers, slight chance of thunderstorms. Thursday Night: Winds less than 25 kt. Areas of rough seas. Chance of rain showers, slight chance of thunderstorms. Friday: Winds less than 25 kt. Local rough seas. && .BOX WATCHES/WARNINGS/ADVISORIES... CT...None. MA...None. RI...None. MARINE...None. && SYNOPSIS...KJC/NMB NEAR TERM...EVT/NMB SHORT TERM...KJC LONG TERM...NMB AVIATION...EVT/NMB MARINE...KJC/EVT/NMB
Hazardous Weather Outlook National Weather Service Boston/Norton MA 719 PM EDT Sun Jun 24 2018 CTZ002>004-MAZ002>024-026-RIZ001>008-252330- Hartford CT-Tolland CT-Windham CT-Western Franklin MA- Eastern Franklin MA-Northern Worcester MA-Central Middlesex MA- Western Essex MA-Eastern Essex MA-Western Hampshire MA- Western Hampden MA-Eastern Hampshire MA-Eastern Hampden MA- Southern Worcester MA-Western Norfolk MA-Southeast Middlesex MA- Suffolk MA-Eastern Norfolk MA-Northern Bristol MA- Western Plymouth MA-Eastern Plymouth MA-Southern Bristol MA- Southern Plymouth MA-Barnstable MA-Dukes MA-Nantucket MA- Northern Middlesex MA-Northwest Providence RI- Southeast Providence RI-Western Kent RI-Eastern Kent RI-Bristol RI- Washington RI-Newport RI-Block Island RI- 719 PM EDT Sun Jun 24 2018 This Hazardous Weather Outlook is for northern Connecticut, all of Massachusetts east of Berkshire County, and Rhode Island. .DAY ONE...Tonight. No hazardous weather is expected at this time. .DAYS TWO THROUGH SEVEN...Monday through Saturday. There is a chance that Heat Advisory or Excessive Heat Warning criteria may be reached during next weekend. ..SPOTTER INFORMATION STATEMENT...... Spotter activation is not expected at this time. ANZ230>237-250-251-254>256-252330- Boston Harbor-Cape Cod Bay-Nantucket Sound-Vineyard Sound- Buzzards Bay-Rhode Island Sound-Narragansett Bay-Block Island Sound- Coastal waters east of Ipswich Bay and the Stellwagen Bank National Marine Sanctuary-Massachusetts Bay and Ipswich Bay- Coastal waters from Provincetown MA to Chatham MA to Nantucket MA out 20 nm- Coastal Waters extending out to 25 nm South of Marthas Vineyard and Nantucket- Coastal Waters from Montauk NY to Marthas Vineyard extending out to 20 nm South of Block Island- 719 PM EDT Sun Jun 24 2018 This Hazardous Weather Outlook is for Massachusetts and Rhode Island coastal waters. .DAY ONE...Tonight. No hazardous weather is expected at this time. .DAYS TWO THROUGH SEVEN...Monday through Saturday. No hazardous weather is expected at this time. ..SPOTTER INFORMATION STATEMENT...... Spotter activation is not expected at this time. For the latest updates, please visit our webpage at www.weather.gov/boston You can follow us on Facebook at www.facebook.com/NWSBoston You can follow us on Twitter at @NWSBoston
Special Weather Statement
National Weather Service Boston/Norton MA
1059 PM EDT SUN JUN 24 2018
MAZ024-250330-
Nantucket MA-
1059 PM EDT SUN JUN 24 2018
...STRONG THUNDERSTORMS DEVELOPING...
At 1058 PM EDT, Doppler radar was tracking a strong thunderstorm 7
miles east of Edgartown, moving east at 40 mph.
Pea size hail may accompany this storm.
Locations impacted include...
Nantucket.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Frequent lightning was occurring. Lightning can strike far away from
the storm. Go inside a building or vehicle. Wait at least 30 minutes
until after the storm has passed to resume outdoor activities.
&&
LAT...LON 4124 6996 4123 7013 4127 7026 4133 7033
4135 7031 4130 7022 4130 7011 4134 7005
4140 7006 4140 7005 4128 6994
TIME...MOT...LOC 0258Z 263DEG 37KT 4134 7035
BelkSpecial Weather Statement National Weather Service Boston/Norton MA 1236 AM EDT MON JUN 25 2018 MAZ004-005-012>015-026-250515- Northwest Middlesex County MA-Southern Worcester MA-Suffolk MA- Western Norfolk MA-Central Middlesex County MA-Northern Worcester MA- Southeast Middlesex MA- 1236 AM EDT MON JUN 25 2018 ...STRONG THUNDERSTORMS DEVELOPING... At 1235 AM EDT, Doppler radar was tracking a strong thunderstorm over Bolton, or near Marlborough, moving east at 20 mph. Winds in excess of 30 mph and locally heavy rainfall will accompany this storm. Locations impacted include... Boston, Cambridge, Newton, Somerville, Framingham, Waltham, Brookline, Medford, Arlington, Billerica, Marlborough, Woburn, Chelmsford, Natick, Watertown, Lexington, Needham, Wellesley, Wakefield and Reading. PRECAUTIONARY/PREPAREDNESS ACTIONS... Do not drive through flooded roads or underpasses. Avoid low lying areas near small streams. Frequent lightning was occurring. Lightning can strike far away from the storm. Go inside a building or vehicle. Wait at least 30 minutes until after the storm has passed to resume outdoor activities. && LAT...LON 4253 7107 4223 7114 4236 7170 4259 7166 TIME...MOT...LOC 0435Z 281DEG 16KT 4244 7159 Belk
Special Weather Statement
National Weather Service Boston/Norton MA
1258 AM EDT MON JUN 25 2018
MAZ005-007-013>016-250545-
Eastern Essex MA-Suffolk MA-Western Norfolk MA-
Central Middlesex County MA-Eastern Norfolk MA-
Southeast Middlesex MA-
1258 AM EDT MON JUN 25 2018
...STRONG THUNDERSTORMS DEVELOPING...
At 1258 AM EDT, Doppler radar was tracking a strong thunderstorm near
Sudbury, or 7 miles west of Waltham, moving east at 25 mph.
Winds in excess of 30 mph and locally heavy rainfall will accompany
this storm.
Locations impacted include...
Boston, Cambridge, Quincy, Lynn, Newton, Somerville, Framingham,
Waltham, Malden, Brookline, Medford, Weymouth, Revere, Peabody,
Arlington, Everett, Salem, Billerica, Marlborough and Woburn.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Do not drive through flooded roads or underpasses. Avoid low lying
areas near small streams.
Frequent lightning was occurring. Lightning can strike far away from
the storm. Go inside a building or vehicle. Wait at least 30 minutes
until after the storm has passed to resume outdoor activities.
&&
LAT...LON 4251 7088 4245 7090 4244 7091 4243 7090
4241 7090 4242 7095 4236 7094 4235 7092
4222 7095 4234 7151 4255 7147
TIME...MOT...LOC 0458Z 280DEG 20KT 4242 7139
BelkThe Boston radar (KBOX), 51 km away, was scanning. The volume nearest the first event began at 05:28 UTC.
11 flood, 2 thunderstorm wind. Local standard time, as filed.
At 12:30 AM EST, Winter Street along the western side of the Cambridge Reservoir in Waltham was reported flooded and impassable.
At 12:37 AM EST, Sudbury Road near East Bridge in Concord was reported to be flooded with two feet of standing water.
At 12:40 AM EST, Beech Street in Belmont was reported flooded and impassable from Waverly Road to Upland Road.
At 12:52 AM EST, a large tree was down on a car and laying across Auburn Street in Medford. At the same time, a tree was reported down on Summer Street and a large tree was down on George Street.
At 12:53 AM EST, Main Street near Walmart in North Reading was flooded with one foot of standing water.
At 12:55 AM EST, Riverside Avenue at City Hall Mall in Medford was reported flooded and impassable.
At 12:55 AM EST, a tree and wires were down on Webcowett Road in Arlington, near the Medford town line.
At 1:03 AM EST, the area between the Everett Recreation Center and the Everett Police Department was reported flooded and impassable.
At 1:03 AM EST, a car was trapped in flood waters near the intersection of Lake Street and Lexington Street in Waltham.
At 1:20 AM EST, five cars were trapped in flood waters on the on the exit ramp from U.S. Route 1 to State Route 16.
At 1:27 AM EST, the junction of Broadway and State Route 16 in Revere was flooded and impassable.
At 1:30 AM EST, Meridian Street in Malden was reported flooded and impassable with cars trapped in the flood waters.
At 1:30 AM EST, Sqier Road was reported flooded and impassable from Patriot Parkway to the circle at State Route 107.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Massachusetts in 2018Every state in 2018This day in weather historyWarnings in Massachusetts, June 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 2026-09-24. Each event’s entry at NCEI: 754859, 755926, 754860, 754872, 754863, 754864, 754874, 754868, 755927, 755930, 755931, 754870, 755933.