Saturday, September23, 2017 L-36.com


Marine Weather and Tides
Somerville, MA

Version 3.4
What's New / NOTES
6/25/2017 - NOAA is having a major issue that impact the 7 day forecast load times. Many users are reporting problems. The issue has been reported.
5/23/2017 - Worked with NOAA again to speed up the 7 day forecast load times. Thanks to them for being responsive.
5/19/2016 - There were issues with the 3 day airport observation history. I switched to another data source. Let me know if you see any issues with the data feeds.

Sunrise 6:32AMSunset 6:39PM Saturday September 23, 2017 6:01 PM EDT (22:01 UTC) Moonrise 9:51AMMoonset 8:48PM Illumination 11% Phase: Waxing Crescent; Moon at 3 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- 338 Pm Edt Sat Sep 23 2017
Tonight..NE winds around 5 kt, becoming N after midnight. Waves 1 foot or less. Patchy fog after midnight with vsby 1 to 3 nm.
Sun..N winds around 5 kt, becoming E in the afternoon. Waves 1 foot or less. Patchy fog.
Sun night..S winds around 5 kt, becoming sw after midnight. Waves 1 foot or less.
Mon..E winds around 5 kt. Waves 1 foot or less.
Mon night..SE winds around 5 kt, becoming S around 5 kt after midnight. Waves 1 foot or less. Patchy fog. Vsby 1 to 3 nm.
Tue..SE winds around 5 kt. Waves 1 foot or less. Patchy fog. Vsby 1 to 3 nm.
Tue night..S winds around 5 kt. Waves 1 foot or less.
Wed..S winds around 5 kt. Waves 1 foot or less.
Wed night..S winds around 5 kt. Waves 1 foot or less. A chance of showers.
Thu..SW winds around 5 kt. Waves 1 foot or less. A chance of showers.
Thu night..NW winds 5 to 10 kt. Waves 1 foot or less. A chance of showers. 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 338 Pm Edt Sat Sep 23 2017
Synopsis for massachusetts and rhode island coastal waters.. The remnants of jose centered about 150 miles southeast of nantucket will continue to weaken and slowly drift east through Sunday. High pressure will build over the waters Sunday and remain in control through midweek. Hurricane maria will slowly lift north and be located off the north carolina coast by the middle of next week. It will generate southerly swell particularly across our southern outer waters during the first half of next week. Mariners should Monitor the latest forecasts from the national hurricane center at www.nhc.noaa.gov. 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 232023
afdbox
area forecast discussion
national weather service taunton ma
423 pm edt Sat sep 23 2017

Synopsis
High pressure, both at the surface and aloft, will extend from the
eastern great lakes to new england tonight into early next week.

It will bring unseasonably warm weather to the region into the
middle of next week. Maria is expected to pass southeast of new
england late in the week with strongest winds well offshore.

Near term until 6 am Sunday morning
Into this evening...

mostly clear skies across the region, except southern plymouth
county and CAPE cod and the islands. The clearing line will slow
down and may never reach those areas, which still have low clouds
and areas of fog. Temperatures will range from the mid 80s in ct and
western ma to only the mid 60s on outer CAPE cod and nantucket.

The only gusty winds left were confined to the islands.

Tonight...

sref probablities of low ceilings are quite high along the southeast
ma coast. NCEP time lagged rapid refresh ensemble system
shows visibilities lowering from east to west in that same area.

All indications are that CAPE cod and the islands, as well as
portions of interior southeast ma will have fog and low cloudiness
through the night. In fact, a dense fog advisory may be needed.

Elsewhere, a pleasant night is in store, with just some cirrus
clouds aloft and lows in the upper 50s to lower 60s. Some patchy fog
may develop late over portions of the interior.

Short term 6 am Sunday morning through Sunday night
Tonight...

winds diminish tonight, which with clear skies will allow
temperatures to cool to dew point. We trended toward the MOS values
for min temp, which was a couple of degrees lower than the standard
guidance. Radiation fog possible in the interior, and marine
fog stratus is possible along the CAPE islands south coast.

Sunday...

**record high temperatures expected**
high pressure over the region, both at the surface and aloft,
will mean sunshine and hot temperatures away from the coast.

Heights at 500 mb are forecast at or above 590 dm, and 850
temps are forecast at 18-20c. 925 mb temps are forecast to
reach +24c. Expecting highs reaching the lower 90s in the ct
river valley, which would be a record... See climate section at
the end of this forecast discussion. Expecting upper 80s
elsewhere in interior southern new england. Light winds under
the high pressure will allow daytime sea breezes, which will
keep temps much cooler along the shoreline... .Only 70s to near
80.

The one big exception to the above will be CAPE cod and the
islands, which are likely to begin the day with cloud cover and
areas of fog, which may linger through a big chunk of the
morning, before becoming partly sunny. Expecting highs on the
cape and islands to range from the upper 60s on nantucket to
the mid 70s on the upper cape.

With dewpoint temperatures only in the lower to mid 60s, the
heat indices are forecast to reach 90 to 94, just shy of heat
advisory criteria - although that criteria requires it to last
for two days. Will need to keep an eye on this.

Sunday night...

expecting mostly clear skies. Could see marine stratus again
late at night over the CAPE and islands. Patchy fog possible
late in some interior areas. Lows in the 60s.

Swells from hurricane maria will be reaching south coastal
areas, so a high surf advisory remains posted for those areas.

Long term Monday through Saturday
Highlights...

* summer warmth expected to the middle of next week
* maria expected to sharply recurve out to sea southeast of new
england late next week
no major surprises in the 23 12z guidance. Still expecting an
anomalous mid level ridge to hover over our region through the
middle of next week, although it should weaken with time after
Tuesday. The strength of this ridge will be crucial in delaying the
northward progress of maria towards our region.

High pressure with dry weather expected Monday and Tuesday.

Temperatures should be 10-15 degrees above normal Monday, but not
quite as much Tuesday or Wednesday. A few interior spots may reach
90 degrees Monday. Seabreezes should develop along both coasts,
lowering daytime MAX temperatures there.

A potential weak low level front just south of our region, may be
enough to trigger a few showers Tuesday night into Wednesday. A
greater risk for showers should be ahead of a cold front sweeping
through our region Wednesday night into Thursday morning. This
cold front and a potent mid level trough are expected to be the
final kickers which steers maria out to sea well to our south.

Drier weather should prevail next Friday into Saturday, although
cannot dismiss the possibility of some stray showers given the
proximity of a mid level trough. The bigger change will be the
temperatures, which should snap back to near normal levels during
this time.

The primary impact on our region from maria will likely be another
prolonged period of high surf and dangerous rip currents, mainly
along ocean-exposed south coast beaches. For several days, maria
tracks near a great circle route in our direction and hence we will
likely see significant long period swells from the S or SE propagate
into our coastal waters most of next week. The slow northward speed
of maria for the next several days may enhance the swell activity
during this period.

Aviation 20z Saturday through Thursday
Forecaster confidence levels...

low - less than 30 percent.

Moderate - 30 to 60 percent.

High - greater than 60 percent.

Short term through Sunday night ...

4 pm update...

tonight... Moderate confidence.

Ifr lifr conditions in fog still persisting on CAPE cod and the
islands. Models show that this will persist through the night,
with the fog possibly becoming dense. The low clouds and fog may
spread westward into interior southeast ma, but they are not
expected to reach as far as boston or providence.

Elsewhere,VFR conditions. Patchy fog with isolated ifr lifr
conditions possible over portions of the interior late.

Sunday... High confidence.

Any interior fog burns off early in the morning. Ifr lifr in low
clouds and fog will be slower to lift over CAPE cod and the
islands and may persist through the morning. OtherwiseVFR most
locations with light wind. Sea breezes expected along the
coastlines, including kbos.

Sunday night... Moderate to high confidence.

Vfr most areas, however, could see marine ifr developing again
on CAPE cod and the islands. Patchy areas of fog may develop
late over portions of the interior.

Kbos taf... Moderate confidence.VFR. Can't rule out a touch of
fog or haze toward daybreak. Expecting low clouds and ifr
ceilings to work their way westward into southeast ma, but not
as far as kbos tonight.VFR Sunday, with light sea breezes from
late morning through the afternoon.

Kbdl taf... High confidence in taf. Patchy fog may develop 07z-
11z tonight, although the chance of this is stronger over
valley locations north of springfield.

Outlook Monday through Thursday ... Confidence... High.

Monday through Tuesday...VFR expected.

Tuesday night... MostlyVFR except MVFR in patchy stratus fog
some interior valleys and near the south coast.

Wednesday... GenerallyVFR except MVFR ceilings visibilities
possible in scattered late day showers and patchy late night early
morning stratus fog.

Thursday... GenerallyVFR, with MVFR in scatterd showers during the
morning.

Marine
Forecaster confidence levels...

low - less than 30 percent.

Moderate - 30 to 60 percent.

High - greater than 60 percent.

Tonight... Moderate confidence.

Leftover swell was diminishing along the east coast of ma.

Low clouds and fog will continue along the southern and
southeast coasts tonight with poor visibilities, especially on
the waters south and east of CAPE cod. Winds will diminish to
less than 15 knots, but seas will linger at 5-6 feet on the
southern outer waters.

Sunday... Moderate confidence.

High pressure building over the region will bring light wind,
with sea breezes developing at the shoreline. Poor vsbys in fog
early, slowly improving by late morning or early afternoon over
the southeastern waters. Seas of 5-6 feet will linger on the
southern outer waters. A south swell sent north from maria will
start showing itself in our southern waters late Sunday, with
3-4 feet swell heights in the afternoon.

Sunday night... High confidence.

Seas build to 5 to 7 feet over the southern outer waters, mainly
due to swells from distant hurricane maria. High surf conditions
will exist on area beaches along the south coast. Patchy areas
of fog.

Outlook Monday through Thursday ... Confidence... High
relatively light winds are expected through this period. However,
swells from maria will propagate into the southern coastal waters,
beginning late Sunday night or Monday. Small craft advisories will
likely need to be extended due to rough seas for the waters south of
the ma and ri coast for all of this period.

The swells from maria will likely produce another round of high surf
and dangerous rip currents.

Tides coastal flooding
High surf advisories will expire along the east coast of ma this
evening, but remain in effect through Monday along the south
coast. Swells from maria will likely increase the surf and
associated rip current risk across our ocean-exposed south coast
starting late Sunday and continuing through the week. This will
be true even though maria may eventually recurve out to sea
well southeast of new england.

Climate
The record high MAX temperatures for Sunday and Monday are
bos 90 1959 89 1926
orh 85 2010 85 1970
bdl 89 1959 90 2007
pvd 87 1959 89 1920

Box watches warnings advisories
Ct... None.

Ma... High surf advisory until 6 pm edt Monday for maz020-022>024.

High surf advisory until 6 pm edt this evening for maz007-019.

Ri... High surf advisory until 6 pm edt Monday for riz006>008.

Marine... Small craft advisory from 2 am to 6 pm edt Monday for anz235-
237.

Small craft advisory until 11 pm edt this evening for anz250.

Small craft advisory until 6 pm edt Monday for anz254>256.

Synopsis... Field belk
near term... Field
short term... Field
long term... Belk
aviation... Field belk
marine... Field belk
tides coastal flooding... Field
climate... Staff


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
BHBM3 - 8443970 - Boston, MA 1 mi43 min 67°F 1015.3 hPa
44013 - BOSTON 16 NM East of Boston, MA 22 mi71 min ENE 5.8 G 7.8 61°F 60°F4 ft1016.1 hPa (+0.0)
44029 - Buoy A0102 - Mass. Bay/Stellwagen 29 mi117 min NE 5.8 G 7.8 62°F 60°F5 ft1015.3 hPa
FOXR1 - 8454000 - Providence, RI 43 mi43 min ENE 8.9 G 11 78°F 67°F1015.1 hPa
PVDR1 44 mi43 min NE 8 G 11 80°F 1015.2 hPa67°F
FRVM3 - 8447386 - Fall River, MA 46 mi49 min 78°F 68°F1016.2 hPa
BLTM3 - 8447387 - Borden Flats Light at Fall River, MA 46 mi43 min NE 8.9 G 11 76°F 1014.6 hPa
FRXM3 47 mi43 min 73°F 66°F
CPTR1 - 8452944 - Conimicut Light, RI 47 mi49 min NE 9.9 G 12 79°F 67°F1015 hPa
IOSN3 - Isle of Shoals, NH 48 mi61 min S 2.9 G 4.1 64°F 1015.8 hPa (-0.8)60°F
BGXN3 - Great Bay Reserve, NH 49 mi76 min SE 1.9 75°F 1017 hPa61°F

Wind History for Providence, RI
(wind in knots)    EDIT      (on/off)   Help
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Last
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NE14
G23
NE13
G22
NE11
G25
NE15
G20
NE14
G18
NE12
G18
NE13
G18
NE12
G22
NE9
G15
NE14
G21
NE13
G20
NE8
G18
NE11
G15
NE11
G15
NE9
G16
NE8
G14
NE11
G15
NE12
G16
NE7
G13
E11
NE12
G16
NE9
G14
NE9
G14
E8
G11
1 day
ago
NE16
G22
NE13
G21
NE13
G18
NE13
G18
NE21
G26
NE24
G32
NE22
G33
NE20
G32
NE17
G25
NE18
G29
NE18
G27
NE15
G27
NE17
G24
NE15
G20
NE20
G26
NE14
G24
NE17
G23
NE16
G26
NE12
G22
NE16
G21
NE15
G25
NE16
G25
NE17
G24
NE15
G27
2 days
ago
NE12
G23
NE16
G26
NE15
G23
NE13
G18
NE12
G20
NE16
G22
NE12
G19
NE17
G26
NE13
G23
NE12
G21
NE12
G22
NE12
G21
NE18
G24
NE17
G26
NE18
G28
NE21
G28
NE17
G28
NE18
G23
NE17
G25
NE19
G29
NE19
G31
NE20
G29
NE17
G26
NE18
G25

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Boston, Logan International Airport, MA2 mi67 minESE 610.00 miA Few Clouds67°F62°F84%1016.2 hPa
East Milton, MA11 mi65 minENE 7 mi72°F60°F66%1017 hPa
Norwood, Norwood Memorial Airport, MA14 mi68 minVar 410.00 miFair78°F63°F60%1015.6 hPa
Bedford, Hanscom Field, MA14 mi65 minNNW 510.00 miFair83°F59°F44%1016.5 hPa
Beverly, Beverly Municipal Airport, MA17 mi68 minE 510.00 miFair75°F62°F64%1015.3 hPa

Wind History from BOS (wind in knots)
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Last 24hrN20
G30
N18
G27
N19
G31
N17
G25
N20
G25
N15
G24
N16N15
G24
N14N14N15N12N12N9N11N11N9N12NE9E8E11E11E7E6
1 day agoN16
G21
N14N11N15NE17
G25
NE18
G26
N19
G27
NE25
G30
N21
G32
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G30
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G30
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G25
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G28
N19
G27
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G29
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G32
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G31
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G31
N19
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N18
G28
N22
G31
2 days agoNE19
G26
N21
G25
N14N11N16
G23
N17N17
G25
--N18
G26
N18
G29
N23
G28
N21
G30
N23
G30
N22
G30
NE21
G30
N21
G33
N23
G30
N23
G31
N25
G34
N23
G31
--NE21
G33
NE20N18
G24

Tide / Current Tables for Charlestown Bridge, Charles River, Massachusetts
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Charlestown Bridge
Click for Map
Sat -- 01:52 AM EDT     10.37 feet High Tide
Sat -- 06:32 AM EDT     Sunrise
Sat -- 07:57 AM EDT     0.09 feet Low Tide
Sat -- 09:50 AM EDT     Moonrise
Sat -- 02:09 PM EDT     10.49 feet High Tide
Sat -- 06:39 PM EDT     Sunset
Sat -- 08:23 PM EDT     -0.07 feet Low Tide
Sat -- 08:48 PM EDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
89.910.49.67.95.530.90.10.92.757.59.610.5108.56.43.91.50.10.21.63.6

Tide / Current Tables for Boston Harbor, Massachusetts Current
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Boston Harbor
Click for Map
Sat -- 01:26 AM EDT     -0.00 knots Slack
Sat -- 05:44 AM EDT     -1.27 knots Max Ebb
Sat -- 06:32 AM EDT     Sunrise
Sat -- 07:54 AM EDT     0.00 knots Slack
Sat -- 09:50 AM EDT     Moonrise
Sat -- 11:12 AM EDT     1.27 knots Max Flood
Sat -- 01:49 PM EDT     -0.00 knots Slack
Sat -- 06:12 PM EDT     -1.30 knots Max Ebb
Sat -- 06:38 PM EDT     Sunset
Sat -- 08:24 PM EDT     0.00 knots Slack
Sat -- 08:48 PM EDT     Moonset
Sat -- 11:39 PM EDT     1.16 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.90.3-0.3-0.7-1.1-1.2-1.3-0.90.10.91.21.31.10.6-0.1-0.6-1-1.2-1.3-1.2-0.40.511.1

Weather Map and Satellite Images
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Weather Map
wmap_A
IR Satellite Image from GEOS
east_satellite

GOES Local Image of Northeast    EDIT
Geos

Wind Forecast for Boston, MA (18,4,5,8)
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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 numerious 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.