Marine Weather and Tide Forecast for Chelsea, MA
April 23, 2024 5:29 AM EDT (09:29 UTC) Change Location
 | Sunrise 5:48 AM Sunset 7:36 PM Moonrise 7:35 PM Moonset 5:33 AM |
ANZ230 Boston Harbor- 405 Am Edt Tue Apr 23 2024
Today - S winds 5 to 10 kt, becoming se 10 to 15 kt with gusts up to 20 kt this afternoon. Waves 1 foot or less, then around 2 ft this afternoon.
Tonight - S winds 10 to 15 kt. Gusts up to 20 kt in the evening. Waves around 2 ft in the evening, then 1 foot or less.
Wed - SW winds 10 to 15 kt. Gusts up to 20 kt in the afternoon. Waves around 2 ft. A chance of showers in the morning, then showers likely in the afternoon.
Wed night - NW winds 20 to 25 kt with gusts up to 30 kt. Waves around 2 ft.
Thu - N winds 10 to 15 kt with gusts up to 20 kt, becoming E in the afternoon. Waves around 2 ft in the morning, then 1 foot or less.
Thu night - S winds around 10 kt, becoming sw after midnight. Waves 1 foot or less.
Fri through Sat - S winds 10 to 15 kt with gusts up to 20 kt. Waves around 2 ft.
Sat night - S winds around 15 kt with gusts up to 20 kt. Waves around 2 ft. 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.
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 405 Am Edt Tue Apr 23 2024
Synopsis for massachusetts and rhode island coastal waters - High pres continues to dominate weather conditions through today. A cold front will cross the region on Wed, bringing a round of showers and Thunderstorms. High pres builds back in Thu, and remains in place through Sat.
Area Discussion for - Boston, MA
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FXUS61 KBOX 230725 AFDBOX
Area Forecast Discussion National Weather Service Boston/Norton MA 325 AM EDT Tue Apr 23 2024
SYNOPSIS
Chilly this morning, then turning comfortable and mostly sunny this afternoon. Cold front moves across southern New England on Wednesday with showers and perhaps isolated thunderstorms. Large high pressure will build into the region Thursday through Saturday bringing dry weather with moderating temperatures Friday and Saturday. The next chance of showers will be Saturday night into Sunday as a frontal system approaches. Much warmer temperatures are possible by Sunday/Monday but a backdoor front may keep much of the region cooler after all.
NEAR TERM /UNTIL 6 PM THIS EVENING/
Highlights:
* Clear and chilly to start. Sunny and comfortable this afternoon.
Brr, a chilly start to the day thanks to clear sky cover overnight and calm winds. Frost Advisory remains in effect until 7am due to morning temperatures across portions of Connecticut and southeast Massachusetts, as well as Rhode Island. Temperatures will quickly climb into the low and middle 60s this afternoon, while the immediate coast remains in the upper 50s. Plenty of sunshine this afternoon due to a broad area of high pressure stretching across much of the eastern seaboard.
Due to the dry profile of the lower atmosphere could have issues with our dewpoint forecast today, did opt to use the 10th percentile of the NBM, but this might not be low enough - something the day shift will need to monitor. As it stands, the minimum value of relative humidity this afternoon is 20 to 30 percent. Winds are from the south this afternoon at 10 to 15 mph and gusts to 25 mph.
SHORT TERM /6 PM THIS EVENING THROUGH 6 PM WEDNESDAY/
Highlights:
* Less cold Tuesday night, showers return for Wednesday and perhaps an isolated thunderstorm during the afternoon.
Overnight into Wednesday morning is less cold, due to the increasing cloud cover and steady southerly wind, temperatures only drop back into the upper 30s and low 40s. No threat for frost, but that does return Wednesday night - likely to result in a new frost headline.
Our next chance for rain and perhaps an isolated thunderstorm is Wednesday with the passage of a cold front and its associated robust mid-level shortwave/trough. There is adequate moisture, PWATs are between 0.7 and 1.0 inches, and lift to support numerous showers during Wednesday morning. Do think the better chance for any rumbles of thunder would be during the afternoon do the the steep mid-level lapse rates - in addition to a couple hundred units of surface based CAPE. QPF is in the neighborhood of 0.10 to 0.15 inch, but isolated areas of higher amounts are possible within these isolated thunderstorms.
Afternoon highs will depend a bit on the amount of clearing we have during the afternoon, but generally a seasonable temperatures in the upper 50s to low 60s. Behind the front, the wind becomes northwest and sets the stage for a much colder night ahead.
LONG TERM /WEDNESDAY NIGHT THROUGH MONDAY/
Key Points...
* Widespread showers Wed and possibly an isolated t-storm, then drying and cold Wed night with freezing temps.
* Dry Thu through Sat. Cool Thu then milder Fri-Sat
* Chance of showers Sat night and Sun
Details...
Dry, post frontal NW flow kicks in late Wednesday and persists into Thursday as high pressure expands from the Great Lakes into New England. This will lead to a colder airmass once again overspreading the region and lows in the upper 20s/low 30s Thursday morning.
Frost/Freeze headlines will likely be needed on Thursday and potentially Friday mornings. The surface high remains in control through Saturday, becoming centered over New England on Friday and sinking to our southeast by Saturday night. This pattern offers plenty of sun and light winds each day, so while relative humidities will be quite dry on Thursday (20-30%) fire conditions shouldn't be too elevated unless the high is slower to advance east (and breezy winds were to then linger into Thursday afternoon).
Our next chance of rain comes in the second half of the weekend as the high pressure is shunted southward by our next shortwave rounding the ridge. However, confidence is low for this portion of the forecast given the wide range of possible scenarios. For what it's worth, both the EPS and GEFS ensemble guidance have at least a 30% chance of measurable rain by Sunday afternoon, so odds of unsettled weather will be on the rise regardless. The biggest forecast challenge will be for high temperatures Sunday and Monday.
Guidance continues to advertise the chance for the warmest temps of the season so far (well into the 70s). However, the possibility of a backdoor cold front to keep much of our region colder looms large; this would result in a large gradient from eastern MA to southwest CT. GEFS ensemble guidance is less enthused with the widespread warmth than the EPS at this point. Stay tuned.
AVIATION /07Z TUESDAY THROUGH SATURDAY/
Forecast Confidence Levels:
Low - less than 30 percent.
Moderate - 30 to 60 percent.
High - greater than 60 percent.
06z TAF Update...
Today...High confidence.
VFR. South wind, 10 to 15 knots, isolated gusts this afternoon to 20 knots. Eastern Massachusetts, Cape Cod, and Islands have more or an south/southeast wind direction.
Tonight...High confidence.
VFR. Increasing high clouds early, then mid-level clouds late in the night. South/southwest winds 8 to 12 knots.
Wednesday...High confidence.
MVFR, but IFR is possible in areas of RA or TSRA. RA arrives after 12z from west to east, TSRA possible mid to late afternoon with the passage of a cold front. Southwest winds early around 10 knots, then becoming northwest 10 to 15 knots late afternoon.
KBOS TAF...High Confidence in TAF.
KBDL TAF...High Confidence in TAF.
Outlook /Wednesday Night through Saturday/...
Wednesday Night: VFR. Windy with local gusts up to 30 kt.
Thursday through Friday Night: VFR.
Saturday: VFR. Breezy.
MARINE
Forecaster Confidence Levels:
Low - less than 30 percent.
Medium - 30 to 60 percent.
High - greater than 60 percent.
Today through Wednesday...High confidence.
Tranquil early season boating conditions due to a broad area of high pressure across the eastern seaboard. A cold front moves across the waters Wednesday, bringing showers and the potential for isolated thunderstorms during the second-half of the day. This period features seas and winds below advisory criteria, but behind the cold front Wednesday night, gusty northwest winds may result in marginal small craft conditions.
Outlook /Wednesday Night through Saturday/...
Wednesday Night: Low risk for Small Craft Advisory winds with gusts up to 30 kt. Areas of rough seas.
Thursday: Winds less than 25 kt. Areas of seas approaching 5 ft.
Thursday Night through Saturday: Winds less than 25 kt.
FIRE WEATHER
Today...Elevated Fire Weather Concerns.
Minimum values of relative humidity this afternoon are forecast between 20 and 30 percent this afternoon along with gusts up to 20 MPH. Due to pre-greenup conditions and a dry atmosphere there are elevated fire weather concerns this afternoon.
BOX WATCHES/WARNINGS/ADVISORIES
CT...Frost Advisory until 7 AM EDT this morning for CTZ002>004.
MA...Frost Advisory until 7 AM EDT this morning for MAZ013-016>023.
RI...Frost Advisory until 7 AM EDT this morning for RIZ001>008.
MARINE...None.
Area Forecast Discussion National Weather Service Boston/Norton MA 325 AM EDT Tue Apr 23 2024
SYNOPSIS
Chilly this morning, then turning comfortable and mostly sunny this afternoon. Cold front moves across southern New England on Wednesday with showers and perhaps isolated thunderstorms. Large high pressure will build into the region Thursday through Saturday bringing dry weather with moderating temperatures Friday and Saturday. The next chance of showers will be Saturday night into Sunday as a frontal system approaches. Much warmer temperatures are possible by Sunday/Monday but a backdoor front may keep much of the region cooler after all.
NEAR TERM /UNTIL 6 PM THIS EVENING/
Highlights:
* Clear and chilly to start. Sunny and comfortable this afternoon.
Brr, a chilly start to the day thanks to clear sky cover overnight and calm winds. Frost Advisory remains in effect until 7am due to morning temperatures across portions of Connecticut and southeast Massachusetts, as well as Rhode Island. Temperatures will quickly climb into the low and middle 60s this afternoon, while the immediate coast remains in the upper 50s. Plenty of sunshine this afternoon due to a broad area of high pressure stretching across much of the eastern seaboard.
Due to the dry profile of the lower atmosphere could have issues with our dewpoint forecast today, did opt to use the 10th percentile of the NBM, but this might not be low enough - something the day shift will need to monitor. As it stands, the minimum value of relative humidity this afternoon is 20 to 30 percent. Winds are from the south this afternoon at 10 to 15 mph and gusts to 25 mph.
SHORT TERM /6 PM THIS EVENING THROUGH 6 PM WEDNESDAY/
Highlights:
* Less cold Tuesday night, showers return for Wednesday and perhaps an isolated thunderstorm during the afternoon.
Overnight into Wednesday morning is less cold, due to the increasing cloud cover and steady southerly wind, temperatures only drop back into the upper 30s and low 40s. No threat for frost, but that does return Wednesday night - likely to result in a new frost headline.
Our next chance for rain and perhaps an isolated thunderstorm is Wednesday with the passage of a cold front and its associated robust mid-level shortwave/trough. There is adequate moisture, PWATs are between 0.7 and 1.0 inches, and lift to support numerous showers during Wednesday morning. Do think the better chance for any rumbles of thunder would be during the afternoon do the the steep mid-level lapse rates - in addition to a couple hundred units of surface based CAPE. QPF is in the neighborhood of 0.10 to 0.15 inch, but isolated areas of higher amounts are possible within these isolated thunderstorms.
Afternoon highs will depend a bit on the amount of clearing we have during the afternoon, but generally a seasonable temperatures in the upper 50s to low 60s. Behind the front, the wind becomes northwest and sets the stage for a much colder night ahead.
LONG TERM /WEDNESDAY NIGHT THROUGH MONDAY/
Key Points...
* Widespread showers Wed and possibly an isolated t-storm, then drying and cold Wed night with freezing temps.
* Dry Thu through Sat. Cool Thu then milder Fri-Sat
* Chance of showers Sat night and Sun
Details...
Dry, post frontal NW flow kicks in late Wednesday and persists into Thursday as high pressure expands from the Great Lakes into New England. This will lead to a colder airmass once again overspreading the region and lows in the upper 20s/low 30s Thursday morning.
Frost/Freeze headlines will likely be needed on Thursday and potentially Friday mornings. The surface high remains in control through Saturday, becoming centered over New England on Friday and sinking to our southeast by Saturday night. This pattern offers plenty of sun and light winds each day, so while relative humidities will be quite dry on Thursday (20-30%) fire conditions shouldn't be too elevated unless the high is slower to advance east (and breezy winds were to then linger into Thursday afternoon).
Our next chance of rain comes in the second half of the weekend as the high pressure is shunted southward by our next shortwave rounding the ridge. However, confidence is low for this portion of the forecast given the wide range of possible scenarios. For what it's worth, both the EPS and GEFS ensemble guidance have at least a 30% chance of measurable rain by Sunday afternoon, so odds of unsettled weather will be on the rise regardless. The biggest forecast challenge will be for high temperatures Sunday and Monday.
Guidance continues to advertise the chance for the warmest temps of the season so far (well into the 70s). However, the possibility of a backdoor cold front to keep much of our region colder looms large; this would result in a large gradient from eastern MA to southwest CT. GEFS ensemble guidance is less enthused with the widespread warmth than the EPS at this point. Stay tuned.
AVIATION /07Z TUESDAY THROUGH SATURDAY/
Forecast Confidence Levels:
Low - less than 30 percent.
Moderate - 30 to 60 percent.
High - greater than 60 percent.
06z TAF Update...
Today...High confidence.
VFR. South wind, 10 to 15 knots, isolated gusts this afternoon to 20 knots. Eastern Massachusetts, Cape Cod, and Islands have more or an south/southeast wind direction.
Tonight...High confidence.
VFR. Increasing high clouds early, then mid-level clouds late in the night. South/southwest winds 8 to 12 knots.
Wednesday...High confidence.
MVFR, but IFR is possible in areas of RA or TSRA. RA arrives after 12z from west to east, TSRA possible mid to late afternoon with the passage of a cold front. Southwest winds early around 10 knots, then becoming northwest 10 to 15 knots late afternoon.
KBOS TAF...High Confidence in TAF.
KBDL TAF...High Confidence in TAF.
Outlook /Wednesday Night through Saturday/...
Wednesday Night: VFR. Windy with local gusts up to 30 kt.
Thursday through Friday Night: VFR.
Saturday: VFR. Breezy.
MARINE
Forecaster Confidence Levels:
Low - less than 30 percent.
Medium - 30 to 60 percent.
High - greater than 60 percent.
Today through Wednesday...High confidence.
Tranquil early season boating conditions due to a broad area of high pressure across the eastern seaboard. A cold front moves across the waters Wednesday, bringing showers and the potential for isolated thunderstorms during the second-half of the day. This period features seas and winds below advisory criteria, but behind the cold front Wednesday night, gusty northwest winds may result in marginal small craft conditions.
Outlook /Wednesday Night through Saturday/...
Wednesday Night: Low risk for Small Craft Advisory winds with gusts up to 30 kt. Areas of rough seas.
Thursday: Winds less than 25 kt. Areas of seas approaching 5 ft.
Thursday Night through Saturday: Winds less than 25 kt.
FIRE WEATHER
Today...Elevated Fire Weather Concerns.
Minimum values of relative humidity this afternoon are forecast between 20 and 30 percent this afternoon along with gusts up to 20 MPH. Due to pre-greenup conditions and a dry atmosphere there are elevated fire weather concerns this afternoon.
BOX WATCHES/WARNINGS/ADVISORIES
CT...Frost Advisory until 7 AM EDT this morning for CTZ002>004.
MA...Frost Advisory until 7 AM EDT this morning for MAZ013-016>023.
RI...Frost Advisory until 7 AM EDT this morning for RIZ001>008.
MARINE...None.
| Stations | Dist | Age | Wind | Air Temp | Water Temp | Waves | inHg | DewPt |
| BHBM3 - 8443970 - Boston, MA | 1 mi | 60 min | 44°F | 30.15 | ||||
| 44013 - BOSTON 16 NM East of Boston, MA | 22 mi | 40 min | SSW 7.8G | 43°F | 45°F | 1 ft | 30.19 | 40°F |
| 44029 - Buoy A0102 - Mass. Bay/Stellwagen | 28 mi | 146 min | SW 7.8G | 44°F | 45°F | 1 ft | 30.16 | |
| FOXR1 - 8454000 - Providence, RI | 43 mi | 60 min | WSW 1.9G | 41°F | 47°F | 30.17 | ||
| PVDR1 | 44 mi | 60 min | W 1.9G | 41°F | 30.17 | 39°F | ||
| BLTM3 - 8447387 - Borden Flats Light at Fall River, MA | 46 mi | 60 min | SSW 2.9G | 44°F | 30.17 | |||
| FRVM3 - 8447386 - Fall River, MA | 46 mi | 60 min | 43°F | 50°F | 30.17 | |||
| FRXM3 | 47 mi | 60 min | 42°F | 40°F | ||||
| IOSN3 - Isle of Shoals, NH | 47 mi | 90 min | SW 1.9G | 43°F | 30.15 | 34°F | ||
| CPTR1 - 8452944 - Conimicut Light, RI | 48 mi | 60 min | WSW 4.1G | 42°F | 51°F | 30.16 | ||
| 44018 - SE Cape Cod 30NM East of Nantucket, MA | 49 mi | 50 min | 44°F | 1 ft | ||||
| BGXN3 - Great Bay Reserve, NH | 49 mi | 105 min | 0 | 28°F | 30.15 | 25°F |
toggle option: (graph/table)
Airport Reports
EDIT (hide/show) Help Click EDIT to display multiple airports. Follow links for more data.| Airport | Dist | Age | Wind kt | Vis | Sky | Weather | Temp | DewPt | RH | inHg |
| KBOS GENERAL EDWARD LAWRENCE LOGAN INTL,MA | 3 sm | 35 min | S 08 | 10 sm | Clear | 39°F | 37°F | 93% | 30.17 | |
| KBED LAURENCE G HANSCOM FLD,MA | 14 sm | 38 min | calm | 10 sm | Clear | 30°F | 28°F | 93% | 30.14 | |
| KOWD NORWOOD MEMORIAL,MA | 14 sm | 7 min | calm | 7 sm | Partly Cloudy | 34°F | 30°F | 86% | 30.17 | |
| KBVY BEVERLY RGNL,MA | 16 sm | 36 min | calm | 10 sm | Clear | 32°F | 30°F | 93% | 30.15 | |
| KLWM LAWRENCE MUNI,MA | 24 sm | 35 min | calm | 10 sm | Clear | 34°F | 30°F | 86% | 30.17 |
Tide / Current for Charlestown Bridge, Charles River, Massachusetts
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Charlestown Bridge
Click for Map
Tue -- 05:32 AM EDT Moonset
Tue -- 05:49 AM EDT 0.42 feet Low Tide
Tue -- 05:50 AM EDT Sunrise
Tue -- 12:02 PM EDT 9.40 feet High Tide
Tue -- 06:00 PM EDT 0.94 feet Low Tide
Tue -- 07:34 PM EDT Moonrise
Tue -- 07:35 PM EDT Sunset
Tue -- 07:51 PM EDT Full Moon
Tide / Current data from XTide NOT FOR NAVIGATION
Click for Map
Tue -- 05:32 AM EDT Moonset
Tue -- 05:49 AM EDT 0.42 feet Low Tide
Tue -- 05:50 AM EDT Sunrise
Tue -- 12:02 PM EDT 9.40 feet High Tide
Tue -- 06:00 PM EDT 0.94 feet Low Tide
Tue -- 07:34 PM EDT Moonrise
Tue -- 07:35 PM EDT Sunset
Tue -- 07:51 PM EDT Full Moon
Tide / Current data from XTide NOT FOR NAVIGATION
Charlestown Bridge, Charles River, Massachusetts, Tide feet
| 12 am |
| 9.8 |
| 1 am |
| 8.8 |
| 2 am |
| 7.2 |
| 3 am |
| 5 |
| 4 am |
| 2.7 |
| 5 am |
| 0.9 |
| 6 am |
| 0.4 |
| 7 am |
| 1.2 |
| 8 am |
| 2.8 |
| 9 am |
| 4.8 |
| 10 am |
| 7 |
| 11 am |
| 8.7 |
| 12 pm |
| 9.4 |
| 1 pm |
| 8.9 |
| 2 pm |
| 7.5 |
| 3 pm |
| 5.6 |
| 4 pm |
| 3.5 |
| 5 pm |
| 1.7 |
| 6 pm |
| 0.9 |
| 7 pm |
| 1.6 |
| 8 pm |
| 3.1 |
| 9 pm |
| 5.1 |
| 10 pm |
| 7.3 |
| 11 pm |
| 9.2 |
Boston Harbor
Click for Map
Tue -- 03:34 AM EDT -1.21 knots Max Ebb
Tue -- 05:32 AM EDT Moonset
Tue -- 05:47 AM EDT 0.00 knots Slack
Tue -- 05:49 AM EDT Sunrise
Tue -- 08:59 AM EDT 1.04 knots Max Flood
Tue -- 11:34 AM EDT -0.00 knots Slack
Tue -- 03:48 PM EDT -1.07 knots Max Ebb
Tue -- 05:57 PM EDT 0.00 knots Slack
Tue -- 07:34 PM EDT Moonrise
Tue -- 07:35 PM EDT Sunset
Tue -- 07:51 PM EDT Full Moon
Tue -- 09:07 PM EDT 1.12 knots Max Flood
Tue -- 11:49 PM EDT -0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Click for Map
Tue -- 03:34 AM EDT -1.21 knots Max Ebb
Tue -- 05:32 AM EDT Moonset
Tue -- 05:47 AM EDT 0.00 knots Slack
Tue -- 05:49 AM EDT Sunrise
Tue -- 08:59 AM EDT 1.04 knots Max Flood
Tue -- 11:34 AM EDT -0.00 knots Slack
Tue -- 03:48 PM EDT -1.07 knots Max Ebb
Tue -- 05:57 PM EDT 0.00 knots Slack
Tue -- 07:34 PM EDT Moonrise
Tue -- 07:35 PM EDT Sunset
Tue -- 07:51 PM EDT Full Moon
Tue -- 09:07 PM EDT 1.12 knots Max Flood
Tue -- 11:49 PM EDT -0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Boston Harbor, Massachusetts Current, knots
| 12 am |
| -0.3 |
| 1 am |
| -0.7 |
| 2 am |
| -1 |
| 3 am |
| -1.2 |
| 4 am |
| -1.2 |
| 5 am |
| -0.7 |
| 6 am |
| 0.2 |
| 7 am |
| 0.7 |
| 8 am |
| 0.9 |
| 9 am |
| 1 |
| 10 am |
| 0.8 |
| 11 am |
| 0.3 |
| 12 pm |
| -0.2 |
| 1 pm |
| -0.6 |
| 2 pm |
| -0.9 |
| 3 pm |
| -1 |
| 4 pm |
| -1.1 |
| 5 pm |
| -0.8 |
| 6 pm |
| 0 |
| 7 pm |
| 0.8 |
| 8 pm |
| 1 |
| 9 pm |
| 1.1 |
| 10 pm |
| 1 |
| 11 pm |
| 0.5 |
Boston, MA,
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