Wednesday, September30, 2020
Privacy Policy
L-36.com

Marine Weather and Tides
Amherst Center, MA

Version 3.4
NOTICE
8/26/2020 The 7 day forecast is taking about 5 seconds to load but it will eventually load. NOAA is still working on it.
8/18/2020 NOAA continues to have trouble. Wind guest will occasionally be left off graphs. I am working with NOAA to resolve the issue.
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 6:45AMSunset 6:34PM Wednesday September 30, 2020 11:49 AM EDT (15:49 UTC) Moonrise 6:30PMMoonset 5:17AM Illumination 97% Phase: Waxing Gibbous; Moon at 13 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
    EDIT      (on/off)   Help
ANZ230 Boston Harbor- 1016 Am Edt Wed Sep 30 2020
.gale warning in effect until noon edt today...
This afternoon..SW winds 15 to 20 kt with gusts up to 35 kt. Waves around 2 ft, except 3 to 5 ft at the outer harbor entrance. A chance of showers this morning.
Tonight..SW winds around 10 kt with gusts up to 20 kt. Waves around 2 ft.
Thu..SW winds around 10 kt with gusts up to 20 kt. Waves around 2 ft.
Thu night..SW winds 5 to 10 kt, becoming W after midnight. Waves around 2 ft.
Fri..NE winds around 5 kt, becoming se in the afternoon. Waves 1 foot or less. A chance of showers.
Fri night..S winds 5 to 10 kt, becoming W after midnight. Waves 1 foot or less. A chance of showers.
Sat through Sun night..E winds 5 to 10 kt. Waves 1 foot or less. 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 1016 Am Edt Wed Sep 30 2020
Synopsis for massachusetts and rhode island coastal waters.. A strong cold front sweeps across the waters Wednesday morning with southerly gales ahead of the front. The front moves east of the waters Wednesday afternoon with winds becoming west and subgale. Improving weather with dry conditions and good visibility behind the front. Dry, tranquil boating weather continues tonight and Thursday. Weak low pressure tracks across the new england waters Fri from southwest to northeast. Behind the low, dry west winds follow Saturday. Tranquil boating weather continues Sunday as high pressure builds over the area. For additional information on possible hazardous weather for the week ahead, please visit www.weather.gov/boston/ehwo .


7 Day Forecast for Marine Location Near Amherst Center, MA
   Hourly   EDIT   Help
location: 42.38, -72.5     debug


Area Discussion for - Boston, MA
      (on/off)   Help   NOTE: mouseover dotted underlined text for definition
FXUS61 KBOX 301433 AFDBOX

Area Forecast Discussion National Weather Service Boston/Norton MA 1033 AM EDT Wed Sep 30 2020

SYNOPSIS. A cold front sweeps across the area this morning, bringing widespread heavy rain and strong to possibly damaging winds, with highest rainfall totals across western Massachusetts and Connecticut. Cooler, less humid and drier air then overspreads the region this afternoon and lingers into Thursday. A round of showers is likely Friday, with showers most numerous and heaviest northwest of the I- 95 corridor. Dry and cooler weather returns for the weekend. Another round of showers is possible Sunday night into early next week.

NEAR TERM /UNTIL 6 PM THIS EVENING/. Permitted the High Wind Warning to expire at 10 AM. Also canceled the Wind Advisory across interior southern New England. Southwest winds will continue to diminish into this afternoon. Kept the Wind Advisory for the Cape and islands, which should be the only area likely to see gusts up to 45 mph into early afternoon.

Minor tweaks to temperatures and sky cover. Also tweaked rainfall chances. Majority of the heavy rainfall is over, but can see some showers lingering across the eastern half of southern New England into early afternoon.

745 am update .

The forecast is largely on track. High Wind Warnings across most of RI and southeast MA look to have verified. Over 50K power outages have been reported so far across S New England with numerous reports of downed trees. Blue Hill Observatory reported a gust of 61 kts just before 7 am. A fine line of low-top convection has developed along the cold front as the surface low pressure rapidly intensifies and lifts to the north. This line is expected to clear Eastern MA by around 9 am so the main change to the near term forecast is to lower the PoPs for the next few hours. Most of S New England should be dry by mid to late morning with breezy SW winds behind the front, although these winds will be considerably lower than the damaging winds that some areas experienced this morning.

PREVIOUS DISCUSSION .

430 am update .

* High Wind Warning for most of RI and southeast MA. Other headlines remain the same. Heavy downpours can lead to localized brief urban ponding. * Turning partly sunny albeit breezy and much more refreshing in the afternoon hours.

A rather impressive fine line of convection is moving into Northern NJ and just north of NYC at this time. NYC area airports are reporting gusts of up to 46 mph so the heavy rain is bringing down some of the strong winds aloft. Meanwhile, temperatures across RI and southeast MA are in the low to mid 70s, while a few degrees cooler on the immediate coast. That couple of degrees difference would likely mean that the Cape and Islands escape the worst of the damaging winds. The current timing and spatial coverage of the High Wind Warning still looks good. Aside from strong to damaging winds, there could be localized nuisance urban poor drainage flooding during the heaviest of downpours but most locations would receive some beneficial rain.

Below is our consideration for upgrading most of RI and SE MA to High Wind Warning between 4 and 10 AM:

1) Models have trended even more robust with the low level jet, with 850mb winds up to 80 kts and 925 mb up to 70 kts. GEFS show 850 and 925mb winds at 5 to 6 standard deviations above normal.

2) Highly impressive pressure rise/fall couplet exceeding 14 mb between 09z and 12z. The surface cyclone will race to the north and likely undergo bombogenesis, i.e. see a fall of 24 mb over 24 hours.

3) 00z Bufkit soundings show over 40 kt winds mixed down to well below 1000 ft. 00z CAM guidance shows mixed signal with regards to a well-defined fine line of convection, which would have been very favorable in bringing down the damaging winds. Nonetheless, with the nose of the LLJ pointed at RI and SE MA, we have increased confidence that at least parts of the area will see some kind of wind damage.

4) Leaves are still fully leaved and drought-stressed. Even if winds fall just shy of High Wind Warning criteria (sustained 35 kts or gusts over 50 kts), the potential high-end damage (even if widely scattered) warrants a headline higher than an advisory.

Following the cold front passage, dew points fall rapidly into the 50s during the day. Expect breezy conditions to persist through much of the day as lapse rates steepen though risk for damaging winds should decrease as jet dynamics become less impressive. Currently have used a blend of guidance to derive the forecast daytime highs, with Western MA topping out in the 60s and Eastern MA in the low to mid 70s. The highs could well be reached early in the day as cold air advection commences in earnest. Should be a mostly dry day but with plenty of cold stratocumulus clouds. 00z CAM guidance did suggest that there could be more sun than clouds albeit with breezy west winds by the afternoon hours.

SHORT TERM /6 PM THIS EVENING THROUGH 6 PM THURSDAY/. 430 am update .

Tonight:

With diminishing winds and mostly clear skies, used MOS guidance to derive overnight lows. Lows range from mid 40s in the high terrain of Western MA to low to mid 50s for much of Eastern MA and RI, except for low 60s on the Cape.

Thursday:

* Comfortable day with breezy conditions. Afternoon highs about 5 degrees above average for late Sep/early Oct

A positively tilted H5 trough runs from the Great Lakes into Missouri. This means that S New England remains in a predominant SW flow with the bulk of the cold air staying well west of us. With mixing up to 850mb and 850mb temps around +7 to +9C on Thursday, expect highs to range between upper 60s to mid 70s, with downslope flow potentially leading to highs overperforming in Eastern MA and RI. Dew points remain in the 40s and 50s so it will be a very comfortable day for outdoor activities.

LONG TERM /THURSDAY NIGHT THROUGH TUESDAY/. 430 am update .

Highlights .

* Showers likely Thu ngt and Fri, most numerous NW of I-95 corridor

* Dry and cool weather returns for the weekend

* Showers may return Sunday night into early next week

Precipitation .

Good model agreement on next short wave trough moving across the northeast Thu ngt into Fri. Deepest moisture and lift track across CT and northern MA, yielding highest pops and qpf north and west of the I-95 corridor. Short wave is progressive so dry weather quickly returns Fri night and persist into the weekend. A low amplitude short wave does move across New England Sat, but column is fairly dry so not expecting any showers, just some extra diurnal clouds Sat. Amplifying mid level trough over the Great Lakes Sunday results in downstream ridging across New England, yielding dry pleasant weather over the region. Then by Sunday night and especially into early next week, amplifying Great Lakes/OH Valley trough begins to advect eastward. However models differ on amplitude of trough with EC and its ensembles more robust than the GFS/GEFS/CMC/UKMET. Given spread here followed a model blend yielding a chance of showers from Sunday night into early next week. If the EC solution verifies a coastal storm with a soaking wind swept rain would occur here. But again, the EC and its ensembles are on the stronger side of all model outcomes.

Temperatures .

Seasonably cool Thu ngt and Fri given cloud cover and showers. Behind this departing short wave, cold air advection increases with cooler weather Sat. 925 mb temps around +10C will support highs in the low to mid 60s. Temps aloft about the same Sunday so expecting similar highs, low to mid 60s. These values are a few degs cooler than average, with normal highs in the mid to upper 60s. It will be pleasant with light winds both days, especially Sunday as 1026 mb high crest over the region. Also a mix of clouds sunshine both weekend days. Temps early next week remain uncertain pending amplitude of mid level trough and associated surface low. Wetter EC and its ensembles offer cool temps, while GFS and its ensembles are drier, thus milder temps. Given uncertainty derived temps here from a model blend.

AVIATION /15Z WEDNESDAY THROUGH SUNDAY/. Forecaster Confidence Levels .

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

Today: High confidence.

Mainly VFR through this afternoon. Brief MVFR in heavier showers through about 18Z. Winds turning WSW at 10 to 15 kts with gusts up to 25 kts most of this afternoon. Strong gusty winds possible across the Cape and islands through 17Z.

Tonight: High confidence.

VFR conditions. SW winds at 5 to 10 kts with gusts 15 to 20 kts possible for coastal terminals.

Thursday: High confidence.

VFR conditions. SW winds at 5 to 10 kts except up to 15 kts with gusts 20 to 25 kts possible for coastal terminals.

KBOS Terminal . High confidence in TAF.

KBDL Terminal . High confidence in TAF. Outlook /Thursday Night through Sunday/ .

Thursday Night: VFR.

Friday: Mainly VFR, with areas MVFR possible. Chance SHRA.

Friday Night: Mainly VFR, with local MVFR possible. Breezy. Chance SHRA.

Saturday through Sunday: VFR.

MARINE. * Gale Warnings for all waters this morning.

A cold front will cross the waters later this afternoon. Winds will diminish behind this front during the afternoon, but still expect SW wind gusts around 25 knots. Gale Warnings will be able to be converted to Small Craft Advisories later this afternoon.

Outlook /Thursday Night through Sunday/ .

Thursday Night: Winds less than 25 kt. Areas of seas approaching 5 ft.

Friday through Friday Night: Winds less than 25 kt. Seas locally approaching 5 ft. Chance of rain showers.

Saturday through Sunday: Winds less than 25 kt.

BOX WATCHES/WARNINGS/ADVISORIES. CT . None. MA . Wind Advisory until 1 PM EDT this afternoon for MAZ022>024. RI . None. MARINE . Gale Warning until 2 PM EDT this afternoon for ANZ231-232-250- 254>256. Gale Warning until noon EDT today for ANZ230-233>237-251.

SYNOPSIS . Nocera/Chai NEAR TERM . Belk/Chai SHORT TERM . Chai LONG TERM . Nocera AVIATION . Belk/Nocera/Chai MARINE . Belk/Nocera/Chai


Weather Reporting Stations
   EDIT       (on/off)   Help   NOTE: Click on distance to see the station location on a map
Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
FOXR1 - 8454000 - Providence, RI 70 mi49 min W 15 G 22 70°F 66°F1002.2 hPa (+3.2)
NLNC3 - 8461490 - New London, CT 74 mi49 min SW 8.9 G 16 68°F 68°F1002.9 hPa (+3.0)
BHBM3 - 8443970 - Boston, MA 77 mi49 min 67°F 62°F999.9 hPa (+4.9)

Wind History for Providence, RI
(wind in knots)    EDIT      (on/off)   Help
12
PM
1
PM
2
PM
3
PM
4
PM
5
PM
6
PM
7
PM
8
PM
9
PM
10
PM
11
PM
12
AM
1
AM
2
AM
3
AM
4
AM
5
AM
6
AM
7
AM
8
AM
9
AM
10
AM
11
AM
Last
24hr
S12
G15
S11
G15
S13
S12
S12
G15
S11
G15
S7
G10
S6
S6
S7
S10
G16
S10
G18
S10
G13
S12
G17
S15
G23
S17
G25
S17
G25
S21
G38
SW20
G31
S18
G32
SW13
G23
SW13
G23
SW16
G28
W15
G22
1 day
ago
S9
S8
S6
G11
S11
S10
G13
S12
G15
S11
S6
G10
S5
G8
S3
G7
S6
G9
SW3
S5
W5
SW4
G7
S2
S4
S5
G8
S4
S5
S6
SW6
SW5
G8
S8
2 days
ago
S9
S12
G15
S9
G14
S8
S11
G15
S10
G14
S11
G14
S9
S6
S4
S4
S2
SE2
S4
S8
G12
S7
S8
S7
S6
S5
S5
G8
S8
G11
S11
G14
S10

Airport Reports
    EDIT      (on/off)   Help   Click EDIT to display multiple airports. Follow links for more data.
AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Chicopee Falls / Westover Air Force Base, MA12 mi1.9 hrsS 410.00 miMostly Cloudy61°F58°F90%1000.7 hPa
Orange Municipal Airport, MA18 mi2 hrsSSW 710.00 miOvercast61°F57°F90%1000.4 hPa
Westfield, Barnes Municipal Airport, MA19 mi56 minSW 11 G 1810.00 miMostly Cloudy65°F57°F76%1001.7 hPa

Link to 5 minute data for KCEF

Wind History from CEF (wind in knots)
12
PM
1
PM
2
PM
3
PM
4
PM
5
PM
6
PM
7
PM
8
PM
9
PM
10
PM
11
PM
12
AM
1
AM
2
AM
3
AM
4
AM
5
AM
6
AM
7
AM
8
AM
9
AM
10
AM
11
AM
Last 24hrS5S6S6SW3CalmS34S6S5S8S4SE7SE8S8S5S8
G17
S10
G23
S11
G28
S13
G23
W13
G34
SW4SW7S4SW8
1 day agoSW7
G15
S6S10
G16
SW8
G16
S7S9S10S6S5--S5S9S6S7S7S5SE5S6S5S3S6S7S6S7
2 days agoW4SW5SW5S7S7S7S4S4S7S6S3CalmCalmCalmS3S4S5S6S7S10
G17
S6S5S8
G18
S10
G17

Tide / Current Tables for Hartford, Connecticut
   EDIT   Weekend mode (on/off)   (on/off)   Help   One Week of Data
Hartford
Click for Map
Wed -- 02:27 AM EDT     2.15 feet High Tide
Wed -- 05:18 AM EDT     Moonset
Wed -- 06:47 AM EDT     Sunrise
Wed -- 10:03 AM EDT     0.27 feet Low Tide
Wed -- 02:45 PM EDT     2.16 feet High Tide
Wed -- 06:30 PM EDT     Moonrise
Wed -- 06:33 PM EDT     Sunset
Wed -- 10:24 PM EDT     0.24 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

12
am
1
am
2
am
3
am
4
am
5
am
6
am
7
am
8
am
9
am
10
am
11
am
12
pm
1
pm
2
pm
3
pm
4
pm
5
pm
6
pm
7
pm
8
pm
9
pm
10
pm
11
pm
1.21.82.12.121.81.51.10.70.40.30.511.622.221.81.61.20.80.50.30.3

Tide / Current Tables for Rocky Hill, Connecticut
   EDIT      (on/off)   Help   One Week of Data
Rocky Hill
Click for Map
Wed -- 01:41 AM EDT     2.26 feet High Tide
Wed -- 05:18 AM EDT     Moonset
Wed -- 06:46 AM EDT     Sunrise
Wed -- 08:55 AM EDT     0.29 feet Low Tide
Wed -- 01:59 PM EDT     2.27 feet High Tide
Wed -- 06:29 PM EDT     Moonrise
Wed -- 06:33 PM EDT     Sunset
Wed -- 09:16 PM EDT     0.25 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

12
am
1
am
2
am
3
am
4
am
5
am
6
am
7
am
8
am
9
am
10
am
11
am
12
pm
1
pm
2
pm
3
pm
4
pm
5
pm
6
pm
7
pm
8
pm
9
pm
10
pm
11
pm
1.82.22.32.11.91.61.20.80.40.30.61.11.62.12.32.221.71.30.90.50.30.40.9

Weather Map
       (on/off)   Help Weather Map
wmap_A
GEOS 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.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Ground Weather Radar Station Boston, MA
   (on/off)   Help
weather_mapweather_map weather_map


Cookie Policy:
This website uses cookies to save your settings. No personal information is saved. I do not collect statistics on your visit. You can disable cookies in your browser if you like but it is not recommended for this site. I do not sell cookies. Go to a bakery for that. In fact I do not sell anything. To disable cookies from L-36.com, please refer to the Help button in your browser.
Privacy Policy:
I do not sell or share any user data or anything else for that matter. The only personal information I save is in the site log which has a line for each page view which includes the IP address your browser sends in the header as well as which page you requested. I use this to block hackers and other bad actors. I do not use this raw data to create profiles on users. I periodically delete the log files. Google supplies the ads on this site. Because I do not track who you are, I cannot customize how these ads are served. They may be personalized to improve the ad experience. If you do not want personalized ads, please adjust the settings on the Google site HERE.
. NOTE: The best I can determine, this site is not subject to CCPA but I am doing my best to comply anyway. 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.