Saturday, July20, 2019 L-36.com


Marine Weather and Tides
Sandwich, MA

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Sunrise 5:22AMSunset 8:12PM Saturday July 20, 2019 3:21 AM EDT (07:21 UTC) Moonrise 10:35PMMoonset 8:47AM Illumination 89% Phase: Waning Gibbous; Moon at 18 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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ANZ231 Cape Cod Bay- 116 Am Edt Sat Jul 20 2019
Rest of tonight..SW winds 5 to 10 kt. Seas around 2 ft.
Sat..SW winds 5 to 10 kt. Gusts up to 20 kt in the afternoon. Seas 1 foot or less.
Sat night..SW winds 10 to 15 kt with gusts up to 20 kt, diminishing to 5 to 10 kt after midnight. Seas 1 foot or less.
Sun..SW winds 5 to 10 kt. Gusts up to 20 kt in the afternoon. Seas around 2 ft. A chance of showers and tstms.
Sun night..W winds 5 to 10 kt, becoming nw after midnight. Seas around 2 ft. A chance of showers and tstms.
Mon..N winds 5 to 10 kt, becoming E in the afternoon. Seas around 2 ft. Showers and tstms likely.
Mon night..S winds around 5 kt, becoming sw after midnight. Seas around 2 ft. Showers and tstms likely.
Tue..NW winds 5 to 10 kt with gusts up to 20 kt. Seas around 2 ft. A chance of showers.
Tue night..SW winds around 5 kt. Seas around 2 ft. A chance of showers.
Wed..NE winds around 5 kt. Seas around 2 ft.
Wed night..SW winds around 5 kt. Seas around 2 ft. Winds and seas 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 Sat Jul 20 2019
Synopsis for massachusetts and rhode island coastal waters.. The heat and humidity of today will continue to build across the waters Sat and Sunday. Scattered showers and Thunderstorms may develop Sunday afternoon into Sunday night as a frontal boundary meanders across the region then becomes stationary near the south coast. The front may become the focus for showers and Thunderstorms across the southern half of the waters Mon and Tue. 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 Sandwich, MA
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location: 41.78, -70.49     debug


Area Discussion for - Boston, MA
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Fxus61 kbox 200624
afdbox
area forecast discussion
national weather service boston norton ma
224 am edt Sat jul 20 2019

Synopsis
Extreme heat and humidity is on tap for the weekend with
dangerous heat indices between 105 and 115 degrees during both
afternoons. Dry weather dominates this weekend, but a few
thunderstorms are possible Sunday afternoon and night. A better
chance for some showers and thunderstorms will be next Monday
into Tuesday with eventually much cooler and less humid air
moving into the region. Mainly dry with seasonable temperatures
favored Wednesday through next Friday along with comfortable
humidity levels.

Near term until 6 am this morning
2 am update...

bands of mid and high clouds continue to push across the region
as seen on latest goes-east night fog product and 06z
observations. Dry conditions remain in place as well, as the
nearest showers thunderstorms were across W ny NW pa which are
moving se. Also noting a few showers moving across the mid
hudson valley on latest NE regional 88d radar imagery, but they
continue to dissipate as they shift into the berkshires.

Other than a few brief, stray showers that may push across
western areas, expect dry conditions to continue through the
remainder of the night. It will remain warm and very humid.

Dewpoints will hold in the lower-mid 70s. Temps were running in
the mid 70s to lower 80s away from the shore where readings were
mainly from 70 to 75 with patchy fog along the S coast and
across portions of CAPE cod and the islands. Expect readings to
bottom out in the 70s.

Short term 6 am this morning through 6 am Sunday
*** excessive heat warning continues ***
*** near record high temperatures ***
today...

off to a very warm start with morning lows only 75-80. This
combined with 850 mb temps of +22c to +23c advecting across the
region, boundary layer extending up to 800 mb and weak
downsloping west winds of 10-15 kt will support highs 95-100
away from the south coast and 100-105 possible in the ct river
valley and merrimack valley of northeast ma. These near record
highs will combine with dew pts of 70-75 to yield heat indices
of 105-110 with a few spots in the ct river valley and merrimack
valley approaching 115! Thus dangerous heat and humidity and as
a result excessive heat warnings remain posted.

Given this anomalous airmass derived highs with the warmest
guidance.

Mid level subtropical ridge and associated subsidence should
cap any potential convection tomorrow. Therefore expecting dry
weather.

Tonight...

near record warmth with low temps only falling back to 75-80 with
low 80s likely in the urban centers of boston, providence and
hartford. Thus no relief with these temps and dew pts remaining in
the 70s. Ssw winds and dry weather should prevail.

Long term Sunday through Friday
Highlights...

* dangerous heat humidity sun: heat index values between 105 and 115
and it is possible a few all time record highs are approached
* high uncertainty if any convection develops Sun pm, but it needs
to be monitored given extreme instability EML in place
* some showers thunderstorms likely Mon and or Tue with eventually
much cooler less humid air moving into the region
* mainly dry with seasonable temperatures favored Wed through next
fri along with comfortable humidity levels
details...

Sunday...

everything remains on track for extreme heat humidity for this part
of the country. Strong upper level ridge to the south will continue
to pump a very highly anomalous airmass into southern new england.

850t around +22c and westerly flow will result in near record high
temperatures. In fact, many of the naefs GEFS are showing
temperature profiles outside the models climatology. Therefore, we
expect highs to range between 98 and 103 degrees in many locations
away from any localized marine influences. Whether we end up on the
higher lower side of these numbers will depend upon amount of solar
insolation. If everything turns out to be ideal it is not out of
the question that a few all time record highs are challenged.

More important though will be the dangerous heat index values. Given
the EML in place, dewpoints will tend to stay quite high remaining
in the 70s. This will result in extreme heat index values climbing
to between 105 to 115 degrees during peak afternoon heating.

The other concern Sunday afternoon and evening will be the potential
for convection, but this remains quite uncertain. The highly
anomalous heat humidity coupled with an EML in place will result in
a tremendous amount of instability for this part of the country. We
will probably see CAPE values on the order of 4,000 j kg. A cold
front will be dropping south into the region, but there is limited
upper support. That means there is uncertainty if we are able to
bust the cap. If the cap holds, we may remain completely dry. On
the other hand if it breaks, there is some high end severe weather
potential given the environment in place. Will have a better idea
once we get into the wheelhouse of the high resolution models.

Monday and Tuesday...

interesting setup Mon into Tue as model guidance indicates a few
waves of low pressure forming along the front to our south. Latest
model guidance indicates we may enter the warm sector again for a
time Monday with one of the waves of low pressure. Either way,
there will be the threat for some showers and thunderstorms Mon into
tue. Plenty of uncertainty on timing, but given high pwats locally
heavy rainfall will be a concern. We also will have to watch for
the risk for localized severe weather near any frontal boundaries.

Wednesday through Friday...

mainly dry and seasonable weather appears to be on tap for the
middle and latter half of the next work week. Latest model guidance
shifts the front southeast of our region as high pressure builds in
from the west. The result will be pleasant summerlike temperatures
but with comfortable humidity levels. A big relief from what we
will experience this weekend.

Aviation 06z Saturday through Wednesday
Forecaster confidence levels...

low - less than 30 percent.

Moderate - 30 to 60 percent.

High - greater than 60 percent.

Short term through Sunday ... Moderate to high confidence.

145 am update...

through 12z...VFR conditions for most areas. Areas of fog with
MVFR-ifr CIGS vsbys, except vlifr conditions at times along the
immediate S coast and across portions of the outer CAPE and
nantucket. Conditions should improve toVFR by around 11z-12z.

Sw winds 5 to 10 kt, becoming W after 09z.

Today... Any MVFR-ifr conditions along the immediate S coast
should improve by 14z. Otherwise, expectVFR conditions. W
winds 5 to 10 kt across most areas, except SW winds along the
coast with gusts up to around 15 kt. Dry weather prevails.

Tonight...VFR. Dry conditions continue. MVFR-ifr conditions in
areas of fog by 01z, except patchy lifr conditions INVOF kack.

Conditions should improve toVFR by 06z-07z. W-sw wind 5-10 kt,
with gusts to 15 kt this evening.

Sunday... MainlyVFR. May see MVFR conditions in scattered
shra tsra by around mid morning across N and W mass, then slowly
pushing S during the day. W winds up to 10 kt, may shift to
w-nw late in the day across N mass. Gusts up to around 15-20 kt
in any thunderstorms.

Kbos terminal... High confidence in taf.

Kbdl terminal... High confidence in taf.

Outlook Sunday night through Wednesday ... High confidence.

Sunday:VFR. Breezy. Chance shra, chance tsra.

Sunday night:VFR. Chance shra, chance tsra.

Monday: mainly MVFR, with areasVFR possible. Shra likely, tsra
likely.

Monday night: mainly MVFR, with areasVFR possible. Breezy.

Chance shra, slight chance tsra.

Tuesday: mainlyVFR, with areas MVFR possible. Breezy. Chance
shra, slight chance tsra.

Tuesday night through Wednesday:VFR.

Marine
Forecaster confidence levels...

low - less than 30 percent.

Moderate - 30 to 60 percent.

High - greater than 60 percent.

Short term through Sunday ... High confidence.

1030 pm update...

overnight... Sw winds around 10 kt or less, becoming W after
08z. Low clouds and fog will impact the southern waters from
cape cod southward. Seas 4 ft or less, highest on the southern
waters.

Saturday and Saturday night... W winds 10 kt or less, shifting to
sw 10-15 kt with gusts up to 20 kt from midday Saturday into
Saturday evening. Winds will diminish to around 10 kt from about
midnight onward. Periods of low clouds and fog southern waters.

Seas 4 ft or less.

Outlook Sunday night through Wednesday ... High confidence.

Sunday through Sunday night: winds less than 25 kt. Seas
locally approaching 5 ft. Chance of rain showers, chance of
thunderstorms.

Monday: winds less than 25 kt. Seas locally approaching 5 ft.

Rain showers likely, thunderstorms likely.

Monday night: winds less than 25 kt. Areas of seas approaching
5 ft. Rain showers likely, thunderstorms likely.

Tuesday: winds less than 25 kt. Local rough seas. Chance of
rain showers, slight chance of thunderstorms.

Tuesday night: winds less than 25 kt. Areas of seas approaching
5 ft. Slight chance of rain showers, isolated thunderstorms.

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

Climate
Record highest min temps for Saturday july 20:
bos: 75 in 2016
bdl: 73 in 1975
pvd: 77 in 1983
orh: 72 in 2013
record highs for Saturday july 20:
bos: 99 in 1991
bdl: 100 in 1991
pvd: 101 in 1991
orh: 92 in 1901
record highest min temps for Sunday july 21:
bos: 81 in 1991
bdl: 74 in 1977
pvd: 77 in 1980
orh: 73 in 1991
record highest MAX temps for Sunday july 21
bos: 102 in 1977
bdl: 101 in 1991
pvd: 102 in 1991
orh: 95 in 1926
last occurrence of 100f or higher temperatures
bos: 7 22 2011 (103f)
bdl: 7 18 2012 (100f)
pvd: 7 22 2011 (101f)
orh: 7 4 1911 (102f)
notable high dew points in past years for july 20 and july 21:
Saturday july 20
bos 76 in 2013 (last of multiple years)
bdl 76 in 2005
pvd 76 in 2013 (last of multiple years)
orh 76 in 2013
Sunday july 21
bos 76 in 1994
bdl 78 in 1972
pvd 81 in 1977 (tied for highest all-time at pvd)
orh 76 in 2011 (last of multiple years)

Box watches warnings advisories
Ct... Excessive heat warning until 8 pm edt Sunday for ctz002>004.

Ma... Air quality ALERT from 11 am this morning to 11 pm edt this
evening for maz017>024.

Excessive heat warning until 8 pm edt Sunday for maz002>021-
026.

Heat advisory until 8 pm edt Sunday for maz022-023.

Ri... Air quality ALERT from 11 am this morning to 11 pm edt this
evening for riz001>008.

Excessive heat warning until 8 pm edt Sunday for riz001>007.

Marine... None.

Synopsis... Frank nocera
near term... Evt
short term... Nocera
long term... Frank
aviation... Frank nocera evt
marine... Frank nocera evt
climate... Staff


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
44090 9 mi51 min 70°F1 ft
WAXM3 - Waquoit Bay Reserve, MA 14 mi96 min W 1.9 74°F 1009 hPa74°F
BZBM3 - 8447930 - Woods Hole, MA 20 mi51 min 71°F 73°F1008.8 hPa
44020 - NANTUCKET SOUND 23 mi41 min 75°F1 ft
44018 - SE Cape Cod 30NM East of Nantucket, MA 35 mi31 min SW 14 G 16 71°F 2 ft1007.1 hPa (-1.2)71°F
FRVM3 - 8447386 - Fall River, MA 36 mi51 min 77°F 79°F1009.2 hPa
BLTM3 - 8447387 - Borden Flats Light at Fall River, MA 37 mi51 min SSW 7 G 8.9 77°F 1008.8 hPa
FRXM3 37 mi57 min 77°F 75°F
44013 - BOSTON 16 NM East of Boston, MA 40 mi31 min S 7.8 G 9.7 74°F 69°F1 ft1006.2 hPa (-0.8)74°F
NTKM3 - 8449130 - Nantucket Island, MA 40 mi135 min SW 7 G 9.9 72°F 74°F1009.4 hPa
PRUR1 45 mi51 min 76°F 75°F
CPTR1 - 8452944 - Conimicut Light, RI 46 mi51 min SW 1.9 G 2.9 75°F 76°F1009 hPa
NAXR1 - Narragansett Bay Reserve, RI 46 mi96 min WSW 4.1 75°F 1009 hPa75°F
PTCR1 - 8452951 - Potter Cove, Prudence Island, RI 46 mi51 min WSW 5.1 G 7 76°F 1009.3 hPa
FOXR1 - 8454000 - Providence, RI 48 mi51 min S 4.1 G 4.1 79°F 74°F1008.3 hPa
NWPR1 - 8452660 - Newport, RI 48 mi51 min WSW 9.9 G 12 77°F 66°F1008.9 hPa

Wind History for Borden Flats Light at Fall River, MA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Otis Air National Guard Base, MA9 mi26 minWSW 73.00 miFog/Mist73°F73°F100%1008.8 hPa
Hyannis, Barnstable Municipal-Boardman Airport, MA13 mi25 minWSW 87.00 miFair77°F73°F88%1008 hPa
Plymouth, Plymouth Municipal Airport, MA16 mi29 minSSW 48.00 miFair76°F73°F94%1008.2 hPa
Provincetown Municipal Airport, MA22 mi25 minWSW 108.00 miFair74°F73°F97%1007.9 hPa
Marshfield Airport, MA24 mi46 minVar 610.00 miFair79°F77°F94%1007.8 hPa

Wind History from FMH (wind in knots)
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Last 24hrNE6N6NE45N654Calm6W5SW8SW10SW14SW17SW15
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1 day agoS4CalmCalmSW7S5NW3W3CalmNE6NE10NE7N7NE8NE9NE11NE9NE115
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Tide / Current Tables for Cape Cod Canal (East Entrance), Massachusetts (2)
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Cape Cod Canal (East Entrance)
Click for Map
Sat -- 02:04 AM EDT     9.29 feet High Tide
Sat -- 05:24 AM EDT     Sunrise
Sat -- 08:22 AM EDT     0.20 feet Low Tide
Sat -- 08:47 AM EDT     Moonset
Sat -- 02:38 PM EDT     8.39 feet High Tide
Sat -- 08:11 PM EDT     Sunset
Sat -- 08:34 PM EDT     1.05 feet Low Tide
Sat -- 10:34 PM EDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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78.69.38.87.55.63.51.50.30.41.63.25.178.28.37.56.14.32.51.31.22.23.8

Tide / Current Tables for Cape Cod Canal, Massachusetts Current
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Cape Cod Canal
Click for Map
Sat -- 12:17 AM EDT     -0.12 knots Slack
Sat -- 03:17 AM EDT     -4.49 knots Max Ebb
Sat -- 05:25 AM EDT     Sunrise
Sat -- 06:27 AM EDT     0.19 knots Slack
Sat -- 08:48 AM EDT     Moonset
Sat -- 09:32 AM EDT     4.19 knots Max Flood
Sat -- 01:02 PM EDT     -0.01 knots Slack
Sat -- 03:44 PM EDT     -4.11 knots Max Ebb
Sat -- 06:44 PM EDT     0.03 knots Slack
Sat -- 08:12 PM EDT     Sunset
Sat -- 09:39 PM EDT     3.88 knots Max Flood
Sat -- 10:35 PM EDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.6-2.6-3.9-4.5-4.3-3.6-2.12.23.64.14.13.82.90.6-2.9-3.9-4.1-3.6-2.41.53.13.83.93.5

Weather Map and Satellite Images
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GOES Local Image of    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 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.