Tuesday, July14, 2020
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Marine Weather and Tides
Somerville, MA

Version 3.4
NOTICE
12/16/2019 NOAA is having trouble with requests that include wind gusts. I am posting graphs without wind gusts until it gets fixed.
10/9/2019 Updated the Marine Zones.
9/4/2019 Fixed the weather maps due to NOAA moving them.
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.

Sunrise 5:19AMSunset 8:21PM Tuesday July 14, 2020 3:35 AM EDT (07:35 UTC) Moonrise 12:59AMMoonset 2:41PM Illumination 36% Phase: Waning Crescent; Moon at 24 days in cycle
NOTE: Some of the data on this page has not been verified and should be used with that in mind. It may and occasionally will, be wrong. The tide reports are by xtide and are NOT FOR NAVIGATION.
Marine Forecasts
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ANZ230 Boston Harbor- 116 Am Edt Tue Jul 14 2020
Rest of tonight..NW winds around 5 kt. Waves 1 foot or less.
Tue..N winds 5 to 10 kt. Waves 1 foot or less, then around 2 ft in the afternoon. A chance of showers in the morning, then showers and tstms likely in the afternoon. Some tstms may produce gusty winds and heavy rainfall in the afternoon.
Tue night..NE winds around 10 kt. Waves around 2 ft. Patchy fog. A chance of showers in the evening.
Wed..NE winds 5 to 10 kt. Waves around 2 ft in the morning, then 1 foot or less.
Wed night..NE winds 5 to 10 kt. Waves 1 foot or less. Patchy fog after midnight with vsby 1 to 3 nm.
Thu..E winds 5 to 10 kt. Waves 1 foot or less. Patchy fog in the morning with vsby 1 to 3 nm.
Thu night..S winds 5 to 10 kt. Waves 1 foot or less.
Fri..S winds 5 to 10 kt. Waves 1 foot or less. A chance of showers.
Fri night..SW winds 5 to 10 kt. Waves 1 foot or less. A chance of showers in the evening.
Sat..SW winds around 5 kt. Waves 1 foot or less.
Sat night..SW winds 5 to 10 kt. Waves 1 foot or less. Patchy fog after midnight with vsby 1 to 3 nm. Winds and waves higher in and near tstms. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height.
ANZ200 116 Am Edt Tue Jul 14 2020
Synopsis for massachusetts and rhode island coastal waters.. Small crafts will continue through Tuesday evening for rhode island's coast waters and waters south of block island, martha's vineyard, and nantucket. Additionally, a high surf advisory continues until 8 pm Tuesday. For Tuesday we can expect pop-up afternoon showers or a Thunderstorm. Then high pressure returns Wednesday and Thursday, providing fair weather. Sct'd showers and Thunderstorms return for Friday. For information on possible hazardous weather beyond the 24-36 hour forecast period, please visit www.weather.gov/boston and follow the current hazards link above the map on the left.


7 Day Forecast for Marine Location Near Somerville, MA
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location: 42.37, -71.07     debug


Area Discussion for - Boston, MA
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FXUS61 KBOX 140601 AFDBOX

Area Forecast Discussion National Weather Service Boston/Norton MA 201 AM EDT Tue Jul 14 2020

SYNOPSIS.

Mild and muggy night, but dry as a closed upper low moves in. Breezy, cooler and less humid today with showers and scattered thunderstorms in the afternoon. High pressure then brings fair weather for Wednesday and Thursday. Scattered showers and thunderstorms return early Friday and Friday night. High pressure then bring rain-free but very warm weather for Saturday and Sunday. Another cold front may bring a few thunderstorms Monday.

NEAR TERM /UNTIL 6 AM THIS MORNING/.

1 AM Update .

Reduced precipitation chances overnight per observations and the latest ARW, NMM and HREF guidance. Will see precipitation chances increasing along the MA and NH/VT border as the closed low lifts into the region. Expect some patchy fog across northeast MA due to clear skies and light winds.

650 PM Update .

Showers/storms in NE MA and SE MA had dissipated by 640 PM. A couple of showers/storms were moving from Eastern NY into the Berkshires. Storms in NE CT were diminishing, and one storm south of Quabbin Res was moving east toward some lingering energy . 2000 J/Kg in Srn Worcester Co. Expect leftover convection to slowly diminish through early tonight.

The rest of the night will feature fair but humid air, with temperatures falling into the mid and upper 60s. Fog will linger along the coast, primarily near Cape Cod and the Islands.

Previous Update .

Thunderstorms coverage diminish into the evening with areas of fog developing along the coastal areas and interior fog-prone areas, especially over areas where rain has fallen. Fog coverage will also hinge on the extent to which boundary layer winds decouple. We also cannot rule out some isolated showers but it should be a mostly dry night for most locations. The Berkshires East Slopes will see the coolest readings with overnight lows in the upper 50s to low 60s thanks to dew points falling into the upper 50s. As for most of us away from the interior high terrain, another muggy and mild night is in store with lows bottoming out in the mid 60s.

SHORT TERM /6 AM THIS MORNING THROUGH 6 PM WEDNESDAY/. Tuesday .

* Much cooler day than of late with scattered thunderstorms in the afternoon.

572 Dm closed low slides east over VT/NH, surface low slides offshore into Gulf of Maine. This reinforces onshore flow from the northeast over Eastern MA and RI, and northerly flow over the interior. Lobe of vorticity traversing the area will lead to showers and scattered thunderstorms areawide. Best thunderstorm coverage looks to be in Central MA into Northern RI during the afternoon hours, which is far enough removed from the stabilizing effect of onshore flow and drier air from the cold air advection out in Western MA/CT. However, we have an impressive cold pool aloft with - 12 to -14C at 500mb. This is anomalously cold by mid July standards with only the 10th percentile according to NAEFS Situational Awareness Table. There may be some strong storms particularly over Central MA in the afternoon with CAM guidance showing 1000 J/kg of MLCAPE and good low-level lapse rates of up to 7.5C/km. But with dew points falling into the upper 50s to low 60s, not expecting severe weather, in line with SPC having our entire area in the general thunder category. Also expect plenty of diurnal cumulus with the anomalously strong cold air advection for mid-July standards in Southern New England. Overall, expect a considerably cooler day on Tuesday with highs generally in the mid 70s to mid 80s with mixing up to 850mb and 850mb temperatures are between +12 to +14C. People in Western MA/CT would feel particularly refreshing with dew points falling into the upper 50s by the afternoon hours.

Tuesday night .

Showers diminish into the overnight hours and temperatures will be much cooler than of late, with much of interior MA falling into the 50s. Enjoy!

LONG TERM /WEDNESDAY NIGHT THROUGH MONDAY/. Big Picture .

Upper low moves offshore Wednesday morning. Upper ridge builds over New England during Wednesday and then moves offshore on Thursday. Shortwave in the Nrn Tier zonal flow crosses on Friday. Another ridge then builds overhead Saturday through next Monday.

Mid-July normals for 500-mb contours are around 580 Dm. Forecast values are in the mid 580s to low 590s through the period, so above normal temperatures are expected most of the period. Shallow surface east-northeast winds may undercut the deep warmth Wed-Thursday, especially in Eastern MA. But as those winds become south-southwest later week and and weekend that should trend back to above-normal temperatures.

Model mass fields are similar through Friday, with only minor differences over the weekend. Those differences are the usual ones dealing with shortwaves in a zonal flow. Confidence is moderate-high through through Monday.

Daily details .

Wednesday .

Upper low and cold pool from Tuesday will be moving off for the Maritimes Wednesday. But it remains close enough Wednesday morning that the cold pool instability may generate a few morning showers in Eastern MA. High pressure builds south from Nrn New England, bringing a low-level northeast flow through at least the Central Hills. Dew points in the mid 50s to low 60s will mean a comfortable day for most.

Models hint at some pcpn in Northwest MA in the afternoon/evening, but parameters are weak . forecast CAPE less than 100, LI at plus 4 . and leave that scenario less than credible. Mixing to 900-925 mb taps favorable temps for sfc max values in the 70s and low 80s. Low level east flow will keep the cooler temps in eastern MA.

Quiet weather Wednesday night with light wind and areas of fog.

Thursday .

High pressure remains along the coast and favors another dry day on Thursday. Overall a south-southeast surface flow with westerly winds aloft. GFS again hints at afternoon light pcpn in Northwest MA, but again the instability parameters are weak at best. Mixing to 850 mb taps 11-13C temps, so max sfc temps in the upper 70s to lower 80s, possibly a little cooler where the southeast wind is off the water.

Friday .

Upper shortwave moves east from the Great Lakes, driving a surface cold front east. Southwest upper jet increases during the day, with the right entrance to the jet moving over Srn New England. Lifted Index is forecast sub-zero Friday afternoon. PW values climb to between 1.5 and 2.0 inches. Will forecast scattered showers/tstms, some with local downpours. Convection will linger into Friday night. The cold front is forecast to move through Friday night . expect the chance of convection to end after passage.

Saturday through Monday .

Upper ridge and surface high pressure build over Southern New England Saturday and Sunday. Expect dry weather over the weekend. Some signs of a shortwave forcing its way through the flow on Monday. A cold front works down from the north on Monday and may bring a few showers/thunder. Mixing up to 800 mb will tap 12-13C temps at that level, similar to 17-18C at 850 mb. Expect max sfc temps in the upper 80s and low 90s. Humidity levels will be high, with dew points 65 to 70 during the period . with heat index values in the low to mid 90s Sunday and Monday.

AVIATION /06Z TUESDAY THROUGH SATURDAY/.

Forecaster Confidence Levels .

Low - less than 30 percent. Moderate - 30 to 60 percent. High - greater than 60 percent.

Through 12Z . High confidence

VFR at all terminals except for BED, FMH, HYA and ACK. Clear skies and light winds across northeast MA and recent rainfall has resulted in patchy fog development. Could have visibilities briefly fall to IFR, but anticipate mostly MVFR. As for Cape Cod and the Islands will have IFR to LIFR stratus and fog. Utilized the latest RAP relative humidities for a handle on when the low level moisture will slide out. Light winds gradually becoming NW to N.

Tuesday . Moderate confidence

Any terminals should see conditions improving to VFR during the morning. The combination of the closed upper low just to the north and diurnal heating will result in scattered showers and thunderstorms. Could have some heavy rainfall and gusty winds with some of these storms. Utilized the latest HREF Thunder probabilities for timing on VCTS at BED/PVD/ORH. Not out of the question at other locations, but think these interior locations have the best chance of a storm. If storm or heavier shower moves through a terminal could see MVFR to IFR conditions briefly. Hard to pin point the coverage of the activity at this point in time.

Ceilings should remain VFR, but deteriorate to MVFR to IFR late across coastal locations as flow becomes onshore.

Tuesday night . Moderate confidence

Northeasterly flow at 5 to 10 kts. Should see MVFR to borderline IFR ceilings. Think that the patchy fog will be limited, but best shot will be across locations that receive precipitation today.

Wednesday . High confidence

Any MVFR to borderline IFR ceilings improving to VFR during the morning as high pressure builds in. Only exception is across Cape Cod and the Islands where MVFR ceilings may linger. Winds shifting to an easterly direction.

KBOS Terminal . Moderate confidence in TAF.

KBDL Terminal . High confidence in TAF.

Outlook /Wednesday Night through Saturday/ .

Wednesday Night: Mainly VFR, with local IFR possible.

Thursday: VFR.

Thursday Night: Mainly VFR, with local IFR possible. Breezy. Chance SHRA.

Friday: Mainly MVFR, with areas VFR possible. Breezy. Chance SHRA, slight chance TSRA.

Friday Night: Mainly VFR, with areas IFR possible. Slight chance SHRA, isolated TSRA.

Saturday: VFR.

MARINE. Small Craft Advisories remain in effect for all waters through Tue afternoon due to 5 ft seas over the outer southern waters.

A High Surf Advisory remains in effect for the Islands (including Block Island) until Tuesday evening for the south- facing beaches due to the rip current risk and breaking 4-6 ft waves in the surf zone.

Lower clouds and fog may again develop on the southern waters tonight. Scattered thunderstorms could develop on Tuesday afternoon. Winds turning from southwest to northwest and then northerly by Tuesday afternoon. North winds could gust up to 20 kts Tuesday afternoon into evening over the Eastern waters but stay below small craft criteria.

Outlook /Wednesday Night through Saturday/ .

Wednesday: Winds less than 25 kt. Areas of seas approaching 5 ft. Slight chance of rain showers.

Wednesday Night: Winds less than 25 kt. Seas locally approaching 5 ft.

Thursday: Winds less than 25 kt.

Thursday Night: Winds less than 25 kt. Slight chance of rain showers.

Friday through Friday Night: Winds less than 25 kt. Chance of rain showers, slight chance of thunderstorms.

Saturday: Winds less than 25 kt.

BOX WATCHES/WARNINGS/ADVISORIES. CT . None. MA . High Surf Advisory until 8 PM EDT this evening for MAZ023-024. RI . High Surf Advisory until 8 PM EDT this evening for RIZ008. MARINE . Small Craft Advisory until 8 PM EDT this evening for ANZ235- 237-255-256.

SYNOPSIS . WTB/Chai NEAR TERM . WTB/BL/Loconto/Chai SHORT TERM . Chai LONG TERM . WTB AVIATION . BL MARINE . WTB/Chai


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
BHBM3 - 8443970 - Boston, MA 1 mi54 min 67°F1008.4 hPa
44013 - BOSTON 16 NM East of Boston, MA 22 mi46 min Calm G 1.9 69°F 69°F2 ft1008 hPa (-0.4)69°F
44029 - Buoy A0102 - Mass. Bay/Stellwagen 29 mi92 min SSE 1.9 G 3.9 67°F 2 ft1007.2 hPa
FOXR1 - 8454000 - Providence, RI 43 mi48 min 75°F1009.5 hPa
PVDR1 44 mi48 min 1009.6 hPa
BLTM3 - 8447387 - Borden Flats Light at Fall River, MA 46 mi48 min 1009.4 hPa
FRVM3 - 8447386 - Fall River, MA 46 mi48 min 78°F1009.7 hPa
CPTR1 - 8452944 - Conimicut Light, RI 47 mi48 min 78°F1009.4 hPa
IOSN3 - Isle of Shoals, NH 48 mi36 min NNE 5.1 G 6 67°F 1009 hPa (+0.0)67°F
BGXN3 - Great Bay Reserve, NH 49 mi51 min Calm 67°F 1009 hPa

Wind History for Providence, RI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Boston, Logan International Airport, MA2 mi42 minN 010.00 miA Few Clouds70°F66°F87%1009.3 hPa
East Milton, MA11 mi45 minENE 6 mi68°F66°F93%1010.2 hPa
Norwood, Norwood Memorial Airport, MA14 mi43 minN 00.25 miFog66°F63°F90%1009.1 hPa
Laurence G Hanscom Field Airport, MA14 mi45 minN 010.00 miFair66°F64°F93%1010.2 hPa
Beverly, Beverly Municipal Airport, MA17 mi43 minN 57.00 miFair66°F64°F96%1008.7 hPa

Link to 5 minute data for KBOS

Wind History from BOS (wind in knots)
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Last 24hrSW9W5S6S9SW8W5SW8S6S6SE9S13SW8S14S6NE9NE8S5CalmW4S6N4CalmCalmCalm
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2 days agoE9SE10SE12S11S14S18
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Tide / Current Tables for Charlestown Bridge, Charles River, Massachusetts
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Charlestown Bridge
Click for Map
Tue -- 12:46 AM EDT     1.70 feet Low Tide
Tue -- 12:58 AM EDT     Moonrise
Tue -- 05:20 AM EDT     Sunrise
Tue -- 06:57 AM EDT     8.48 feet High Tide
Tue -- 01:02 PM EDT     1.68 feet Low Tide
Tue -- 02:41 PM EDT     Moonset
Tue -- 07:21 PM EDT     9.17 feet High Tide
Tue -- 08:19 PM EDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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21.72.43.656.788.586.85.33.72.31.72.23.44.96.68.29.1986.64.9

Tide / Current Tables for Boston Harbor, Massachusetts Current
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Boston Harbor
Click for Map
Tue -- 12:50 AM EDT     0.00 knots Slack
Tue -- 12:58 AM EDT     Moonrise
Tue -- 04:08 AM EDT     0.87 knots Max Flood
Tue -- 05:20 AM EDT     Sunrise
Tue -- 06:34 AM EDT     -0.00 knots Slack
Tue -- 11:11 AM EDT     -0.93 knots Max Ebb
Tue -- 01:07 PM EDT     0.00 knots Slack
Tue -- 02:40 PM EDT     Moonset
Tue -- 04:27 PM EDT     0.93 knots Max Flood
Tue -- 06:59 PM EDT     -0.00 knots Slack
Tue -- 08:19 PM EDT     Sunset
Tue -- 11:38 PM EDT     -1.04 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-0.70.10.70.80.90.70.3-0.2-0.5-0.7-0.8-0.9-0.8-0.10.60.90.90.90.5-0-0.4-0.7-0.9-1

Weather Map
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GEOS Local Image of Northeast    EDIT
NOTE: East coast views moved to GEOS-16. They are experimental and not well supported by NOAA so they may not be correct so be warned. This change required redoing a large amount of the GOES code. If the image you are expecting is not showing, please let me know. You may need to use the EDIT function to update your location.
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Wind Forecast for Boston, MA (3,6,7,8)
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Ground Weather Radar Station Boston, MA
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Disclaimer:
The information on this web site has not been checked for accuracy. It is for entertainment purposes only and should be independently verified before using for any other reason. There are five sources. 1) Documents and manuals from a variety of sources. These have not been checked for accuracy and in many cases have not even been read by anyone associated with L-36.com. I have no idea of they are useful or accurate, I leave that to the reader. 2) Articles others have written and submitted. If you have questions on these, please contact the author. 3) Articles that represent my personal opinions. These are intended to promote thought and for entertainment. These are not intended to be fact, they are my opinions. 4) Small programs that generate result presented on a web page. Like any computer program, these may and in some cases do have errors. Almost all of these also make simplifying assumptions so they are not totally accurate even if there are no errors. Please verify all results. 5) Weather information is from numerous of sources and is presented automatically. It is not checked for accuracy either by anyone at L-36.com or by the source which is typically the US Government. See the NOAA web site for their disclaimer. Finally, tide and current data on this site is from 2007 and 2008 data bases, which may contain even older data. Changes in harbors due to building or dredging change tides and currents and for that reason many of the locations presented are no longer supported by newer data bases. For example, there is very little tidal current data in newer data bases so current data is likely wrong to some extent. This data is NOT FOR NAVIGATION. See the XTide disclaimer for details. In addition, tide and current are influenced by storms, river flow, and other factors beyond the ability of any predictive program.