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Marine Weather and Tides
Version 3.4 |
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. 6/2/2019. Many thanks to a user for reporting an error on one of the Edit pages. The switch to PHP 7.2 caused many pages that previously worked to quit working. I fixed many but I still depend on users to report ones I missed. Please report errors HERE or send an email to me at L-36.com. Allen |
| Sunrise 6:59AM | Sunset 4:19PM | Monday December 9, 2019 4:17 AM EST (09:17 UTC) | Moonrise 3:56PM | Moonset 5:05AM | Illumination 93% |  |
ANZ237 Block Island Sound- 338 Am Est Mon Dec 9 2019
.gale warning in effect from this evening through Tuesday morning...
Today..S winds 10 to 15 kt with gusts up to 25 kt, increasing to 20 to 25 kt with gusts up to 35 kt this afternoon. Seas 5 to 8 ft. Patchy fog. Showers. Vsby 1 nm or less, increasing to 1 to 3 nm this afternoon.
Tonight..SW winds 20 to 25 kt with gusts up to 40 kt. Seas 8 to 11 ft. Patchy fog. Showers. Vsby 1 nm or less.
Tue..SW winds 15 to 20 kt. Gusts up to 35 kt, decreasing to 25 kt in the afternoon. Seas 6 to 9 ft. Patchy fog. A chance of showers. Vsby 1 to 3 nm.
Tue night..NW winds 10 to 15 kt with gusts up to 20 kt. Seas 4 to 7 ft. Patchy fog. Rain likely. Vsby 1 to 3 nm.
Wed..NW winds 5 to 10 kt. Gusts up to 20 kt in the afternoon. Seas 3 to 5 ft. Patchy fog. Rain and snow likely. Vsby 1 nm or less.
Wed night..W winds 10 to 15 kt, becoming nw 15 to 20 kt after midnight. Gusts up to 30 kt. Seas 3 to 5 ft.
Thu and Thu night..NW winds 15 to 20 kt with gusts up to 30 kt, becoming ne 5 to 10 kt. Seas 2 to 4 ft.
Fri..SE winds 10 to 15 kt with gusts up to 20 kt. Seas 3 to 5 ft.
Fri night..SE winds 10 to 15 kt with gusts up to 25 kt. Seas 4 to 7 ft. Showers likely. 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.
.gale warning in effect from this evening through Tuesday morning...
Today..S winds 10 to 15 kt with gusts up to 25 kt, increasing to 20 to 25 kt with gusts up to 35 kt this afternoon. Seas 5 to 8 ft. Patchy fog. Showers. Vsby 1 nm or less, increasing to 1 to 3 nm this afternoon.
Tonight..SW winds 20 to 25 kt with gusts up to 40 kt. Seas 8 to 11 ft. Patchy fog. Showers. Vsby 1 nm or less.
Tue..SW winds 15 to 20 kt. Gusts up to 35 kt, decreasing to 25 kt in the afternoon. Seas 6 to 9 ft. Patchy fog. A chance of showers. Vsby 1 to 3 nm.
Tue night..NW winds 10 to 15 kt with gusts up to 20 kt. Seas 4 to 7 ft. Patchy fog. Rain likely. Vsby 1 to 3 nm.
Wed..NW winds 5 to 10 kt. Gusts up to 20 kt in the afternoon. Seas 3 to 5 ft. Patchy fog. Rain and snow likely. Vsby 1 nm or less.
Wed night..W winds 10 to 15 kt, becoming nw 15 to 20 kt after midnight. Gusts up to 30 kt. Seas 3 to 5 ft.
Thu and Thu night..NW winds 15 to 20 kt with gusts up to 30 kt, becoming ne 5 to 10 kt. Seas 2 to 4 ft.
Fri..SE winds 10 to 15 kt with gusts up to 20 kt. Seas 3 to 5 ft.
Fri night..SE winds 10 to 15 kt with gusts up to 25 kt. Seas 4 to 7 ft. Showers likely. 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 Am Est Mon Dec 9 2019
Synopsis for massachusetts and rhode island coastal waters.. A warm front will lift N of the waters this morning. A slow moving cold front will approach southern new england Tue and cross the waters Tue night and Wed. High pres will build into the region from the great lakes Thu and Fri. 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.
Synopsis for massachusetts and rhode island coastal waters.. A warm front will lift N of the waters this morning. A slow moving cold front will approach southern new england Tue and cross the waters Tue night and Wed. High pres will build into the region from the great lakes Thu and Fri. 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 Weekapaug, RI
Hourly EDIT Helplocation: 41.33, -71.76 debug
Area Discussion for - Boston, MA
(on/off) Help NOTE: mouseover dotted underlined text for definitionFXUS61 KBOX 090735 AFDBOX
Area Forecast Discussion National Weather Service Boston/Norton MA 235 AM EST Mon Dec 9 2019
SYNOPSIS. Milder air will push into the region today, accompanied by showers today into Tuesday. A cold front moves through Tuesday night, ushering in much colder air that will likely change rain to snow and linger into Wednesday with accumulations possible. Cold and dry into Friday before temperatures begin to moderate Friday night. Next system brings a period of rain by the weekend, with temperatures trending above normal.
NEAR TERM /TODAY/. 235 AM Update:
* Spotty light icing possible early this morning *
Initial batch of light rain showers/sprinkles lifting through CT as best seen on KOKX WSR-88D may bring light icing to southern parts of Hartford, Tolland, and Windham Counties early this morning and perhaps adjacent parts of western RI as well. Not looking for much more than 0.01" of rain but this could be enough to produce a thin coating of ice on roads, especially given recent couple of days of very cold weather.
* Flood Potential *
Southerly flow has allowed temperatures to rise slowly through the night across most of SNE. High-res models are in good agreement that more widespread showers will arrive between 7 and 10 AM. Heavier rainfall should hold off until this afternoon as larger scale lift increases ahead of mid level short wave and nose of LLJ brings increasing PWATs to over 1 inch, with likely focus south of Mass Pike (and especially near South Coast). Ensembles indicate system is somewhat anomalous in its southerly wind component and moisture (generally 2-3 SD), but not excessively so.
Temperatures rising into 50s, combined with high dew points and strong S/SW winds, will lead to rapid snowmelt across much of SNE especially in CT, RI, and eastern MA where NOHRSC modeling erodes much of existing snowpack. Water content in these areas is no more than 1" on average, so while overall flood threat is low for rivers/streams per MMEFS hydrologic ensembles, there is a higher potential for urban and poor drainage flooding which will affect afternoon commute. Not planning on issuing Flood Watches at this time.
* Strong Winds *
925 mb winds increase to more than 60kt this afternoon across SE New England. Forecast soundings show strong inversion between warmer air aloft and cooler air at surface, which will limit true gust potential. However, momentum alone should be able to realize about 2/3 of that, meaning max gusts up to 40kt seem reasonable. It looks marginal to reach Wind Advisory criteria on Cape Cod/Islands (may be more likely on sustained winds) but since impact would be fairly low we will hold off on any wind headlines, aside from marine as detailed below.
SHORT TERM /TONIGHT THROUGH 6 PM TUESDAY/. Heavier rainfall continues through early tonight, again focused south of Mass Pike where we have larger scale lift from both low level and upper level jets, as well as strong low level convergence and deep moisture. Activity should subside overnight as short wave moves offshore.
Strong southerly flow will keep temperatures nearly steady tonight, in 50s for much of SNE, which will lead to further erosion of snowpack. Per NOHRSC modeling it's likely that we lose all of the snowpack by Tuesday morning except across the hills of western/central MA and northern CT. Expect continued urban/poor drainage flood threat.
Other concern is for areas of dense fog, especially across interior where deeper snowpack is in place.
Next round of showers arrives later Tue afternoon with approach of cold front. By that time PWATs are on the decrease and moisture convergence is less impressive, so not anticipating significant rainfall. We spend most of day in warm sector so despite thick cloud cover highs will top out in the 50s to some lower 60s.
LONG TERM /TUESDAY NIGHT THROUGH SUNDAY/. 345 PM update .
Highlights .
* Rain early Tues nite changes to a period of accumulating snow (potentially plowable in interior and urban corridor) overnight into Wed. Increasing confidence for adverse impact to Wed AM commute. * Cold and dry Wed nite through Fri. Moderating temperature and moisture levels Friday night.
* Next system for the weekend, with rainy conditions and above- normal temps. Details .
Tuesday night into Wednesday:
Colder air rushes southeastward Tuesday night, and as at least sheared-out mid-level vort max ripples northeastward from the central Appalachians, will be looking at rain changing to wet snow on the cold side of the cold front.
Did note more ECMWF Ensemble members indicating snow for Tuesday night into Wednesday than 24 hours ago, with ensemble probabilities for 3" or more of snow in the 24-hour period 18z Tue - 18z Wed now up to 50% across western MA/western Hartford County, the hills in central MA and Tolland County eastward into the northern Providence suburbs. Recent trends in the GFS have also trended snowier in this period. Global models show anomalously strong mid and upper level jets (~ 100 kts at 500 mb, 150 kts at 250 mb, with Southern New England positioned in the favorable equatorward entrance region of each jet), and there are hints in the guidance at some bands (axis of 850 mb -EPV, some though unfocused FGen @ 850) during the overnight hrs.
What remains uncertain is the timing of the changeover, forecast liquid-equivalent precip and the northwestern extent of accumulating snows. Each of the above factors renders confidence in snow accumulations at low to moderate levels. Did note that most models have again increased QPF in this period, though there may be a sharp cutoff in precip N/W of the Mass Pike and especially north of northern MA/Route 2 corridor. WPC's Day-3 accumulation seems fairly reasonable as far as a first-cut at accumulations goes.
In spite of stated uncertainties, do think confidence is increasing in potential for an adversely impacted Wednesday morning commute for at least a part of the region, especially across the central part of the interior (Hartford/Springfield, Worcester/Providence into the I- 95 corridor). This is roughly where axis of greatest liquid- equivalent QPF seems to lie, though some variability in models exists to be re-evaluated with forthcoming guidance. Pavement's also apt to be wet at onset and sharply colder temperatures filtering that could freeze this before or during the period of accumulating snow, the potential for slippery travel into the AM commute remains a possibility.
Wednesday Night through Friday Night:
1040+ mb high becomes anchored across much of New England. Quite chilly and dry through Thursday night with 850 mb temps in the -10 to -15C range. Will show highs in the 20s to near freezing, with lows in the teens. A few single digit lows are possible across northern MA.
Southerly warm advection pattern commences Friday into Friday night as high pressure shifts into the Canadian Maritimes. Temperatures and moisture levels should begin to recover. Will see increased clouds into the nighttime hrs Friday night, and while the GFS brings in warm frontal precip late, likely too dry to support PoPs higher than low Chance.
Saturday into Sunday:
Weekend remains unsettled with the next chance of significant precip by the weekend, though models continue to deviate on timing. As mentioned, the GFS brings rain in as soon as Friday night, while the ECMWF is more into late Saturday into Saturday night, and the Canadian GEM is still slower than the ECMWF. Could be a decent rain maker for most of southern New England, with another round of gusty southerly winds across the waters.
A return to above-normal temps looks likely for the weekend with 850 mb temps rising into the mid/upper single digits Celsius. Will show highs in the upper 40s to mid 50s with clouds and rain likely accompanying the warmest temps, though potential for even warmer with cloud breaks.
AVIATION /07Z MONDAY THROUGH FRIDAY/. Forecaster Confidence Levels .
Low - less than 30 percent. Moderate - 30 to 60 percent. High - greater than 60 percent.
Short Term /through Tuesday/ . High confidence.
06Z TAF Update:
MVFR CIGS across much of interior and around Cape Cod will slowly expand into RI and eastern MA through daybreak. Conditions then steadily lower to IFR/LIFR as showers arrive near KBDL around 12Z and reach eastern MA coast by 14Z. Lowest conditions expected across interior due to presence of deep snowpack. These low conditions persist through tonight before some improvement Tue.
LLWS this morning inland due to light winds at surface and 2kft winds 19040kt. Later today and tonight focus of LLWS shifts into RI and eastern MA as southerly low level jet increases to 50-60kt at 2kft.
KBOS Terminal . High confidence in TAF.
KBDL Terminal . High confidence in TAF.
Outlook /Tuesday Night through Friday/ .
Tuesday Night: MVFR/IFR conditions possible. Breezy. SHRA likely, SHSN likely, PL likely, FZRA likely.
Wednesday: Mainly VFR, with areas IFR possible. Breezy. Chance SHSN.
Wednesday Night through Thursday: VFR. Windy with local gusts up to 30 kt.
Thursday Night through Friday: VFR. Breezy.
MARINE. Short Term /through Tuesday/ . High confidence.
** Gale Warnings for most of waters through Tue morning **
Increasing S/SW winds today between high pressure well offshore and warm front lifting north of waters. Onset of Gale force gusts is early to mid afternoon, with peak gusts of 35-40kt expected from late afternoon through tonight, before winds fall below Gale force later Tue morning.
Steadier showers arrive this morning, with heaviest rain this afternoon through early tonight. Patches of dense fog possible mainly on south coastal waters. More in way of scattered showers Tue before next round of steadier rainfall arrives later in the day.
Outlook /Tuesday Night through Friday/ .
Tuesday Night: Low risk for Small Craft Advisory winds with gusts up to 25 kt. Rough seas up to 10 ft. Rain showers likely, patchy fog.
Wednesday: Winds less than 25 kt. Local rough seas. Rain showers likely, snow showers likely. Local visibility 1 to 3 nm.
Wednesday Night: Moderate risk for Small Craft Advisory winds with local gusts up to 30 kt. Areas of rough seas.
Thursday: Moderate risk for Small Craft Advisory winds with local gusts up to 30 kt. Local rough seas.
Thursday Night: Winds less than 25 kt. Areas of seas approaching 5 ft.
Friday: Winds less than 25 kt. Local rough seas.
BOX WATCHES/WARNINGS/ADVISORIES. CT . None. MA . None. RI . None. MARINE . Gale Warning from 6 PM this evening to 9 AM EST Tuesday for ANZ231>235-237-250-251-254>256. Small Craft Advisory from 2 PM this afternoon to 9 AM EST Tuesday for ANZ230. Small Craft Advisory from noon today to 9 AM EST Tuesday for ANZ236.
SYNOPSIS . EVT/JWD NEAR TERM . JWD SHORT TERM . JWD LONG TERM . Loconto AVIATION . EVT/JWD MARINE . EVT/JWD
Weather Reporting Stations
EDIT (on/off) Help NOTE: Click on distance to see the station location on a mapWind History for New London, CT
(wind in knots) EDIT (on/off) Help| 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 | 12 AM | -12 PM | 2 AM | 3 AM | 4 AM | |
| Last 24hr | N G6 | N G5 | N | N G6 | N | -- | SW | S | S G11 | SW | SW | SW G10 | S | S | -- | N | N | N | N | -- | SW G9 | N | N | |
| 1 day ago | NW G8 | NW G9 | NW G10 | NW G11 | N G10 | NW G11 | N G11 | NW G13 | N G9 | NW | NW | N | NW | N G10 | N G7 | NW | NW | NW | N | N | NW | |||
| 2 days ago | -- | NW | W G5 | W G6 | SW | SW | SW G12 | SW | SW G15 | SW G11 | S G13 | SW G14 | SW G19 | SW G15 | W G13 | W G15 | NW G16 | NW G20 | N G16 | N G16 | N | NW G12 | NW G10 | N G9 |
Airport Reports
EDIT (on/off) Help Click EDIT to display multiple airports. Follow links for more data.| Airport | Dist | Age | Wind kt | Visibility | Sky/Weather | Temp | DewPt | Humidity | Pressure |
| Westerly, Westerly State Airport, RI | 3 mi | 25 min | SSW 5 | 10.00 mi | Overcast | 50°F | 43°F | 77% | 1025.3 hPa |
| Block Island State Airport, RI | 14 mi | 22 min | SSW 10 | 10.00 mi | Overcast | 50°F | 45°F | 83% | 1025.5 hPa |
| Groton / New London, Groton / New London Airport, CT | 15 mi | 22 min | N 0 | 8.00 mi | Light Rain | 45°F | 42°F | 90% | 1025 hPa |
| Montauk, Montauk Airport, NY | 19 mi | 24 min | S 5 | mi | 50°F | 45°F | 83% | 1025.3 hPa | |
Link to 5 minute data for KWST
Wind History from WST (wind in knots)
| 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 | 12 AM | 1 AM | 2 AM | 3 AM | 4 AM | |
| Last 24hr | Calm | Calm | Calm | Calm | N | Calm | S | SW | SW | SW | SW | SW | SW | Calm | SW | SW | SW | S | S | S | S | S | S | |
| 1 day ago | NW | NW | NW | NW | G18 | NW G19 | N G15 | N G15 | NW G14 | N G15 | NW | NW | Calm | NW | Calm | Calm | Calm | Calm | NE | N | ||||
| 2 days ago | W | Calm | W | SW | SW | W | SW | SW | SW | SW G18 | SW G24 | SW G20 | SW G20 | SW G16 | W G22 | W G20 | NW G26 | NW G24 | NW G16 | NW G19 | NW |
Tide / Current Tables for Watch Hill Point, Rhode Island
EDIT Weekend mode (on/off) (on/off) Help One Week of DataWatch Hill Point
Click for Map
Mon -- 04:05 AM EST Moonset
Mon -- 06:10 AM EST 2.72 feet High Tide
Mon -- 07:01 AM EST Sunrise
Mon -- 12:45 PM EST 0.15 feet Low Tide
Mon -- 02:56 PM EST Moonrise
Mon -- 04:18 PM EST Sunset
Mon -- 06:29 PM EST 2.38 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Click for Map
Mon -- 04:05 AM EST Moonset
Mon -- 06:10 AM EST 2.72 feet High Tide
Mon -- 07:01 AM EST Sunrise
Mon -- 12:45 PM EST 0.15 feet Low Tide
Mon -- 02:56 PM EST Moonrise
Mon -- 04:18 PM EST Sunset
Mon -- 06:29 PM EST 2.38 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
| 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 |
| 0.2 | 0.3 | 0.6 | 1.2 | 1.8 | 2.4 | 2.7 | 2.6 | 2.1 | 1.5 | 0.9 | 0.5 | 0.2 | 0.2 | 0.3 | 0.7 | 1.3 | 1.9 | 2.3 | 2.3 | 1.9 | 1.3 | 0.7 | 0.3 |
Tide / Current Tables for The Race, Long Island Sound, New York Current
EDIT (on/off) Help One Week of DataThe Race
Click for Map
Mon -- 02:59 AM EST 0.00 knots Slack
Mon -- 04:06 AM EST Moonset
Mon -- 05:52 AM EST 2.60 knots Max Flood
Mon -- 07:01 AM EST Sunrise
Mon -- 09:11 AM EST -0.00 knots Slack
Mon -- 12:17 PM EST -3.12 knots Max Ebb
Mon -- 02:56 PM EST Moonrise
Mon -- 03:40 PM EST 0.01 knots Slack
Mon -- 04:19 PM EST Sunset
Mon -- 06:24 PM EST 2.48 knots Max Flood
Mon -- 09:42 PM EST -0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Click for Map
Mon -- 02:59 AM EST 0.00 knots Slack
Mon -- 04:06 AM EST Moonset
Mon -- 05:52 AM EST 2.60 knots Max Flood
Mon -- 07:01 AM EST Sunrise
Mon -- 09:11 AM EST -0.00 knots Slack
Mon -- 12:17 PM EST -3.12 knots Max Ebb
Mon -- 02:56 PM EST Moonrise
Mon -- 03:40 PM EST 0.01 knots Slack
Mon -- 04:19 PM EST Sunset
Mon -- 06:24 PM EST 2.48 knots Max Flood
Mon -- 09:42 PM EST -0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
| 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 |
| -2.6 | -2.1 | -1.2 | 0 | 1.3 | 2.3 | 2.6 | 2.2 | 1.4 | 0.3 | -1.2 | -2.4 | -3.1 | -2.9 | -2.1 | -0.9 | 0.5 | 1.7 | 2.4 | 2.4 | 1.8 | 0.9 | -0.4 | -1.7 |
Weather Map
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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
Wind Forecast for Boston, MA (4,6,7,8)
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Ground Weather Radar Station Boston, MA
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