Cape Cod Bay Alt Marine Forecast
| Tonight...S Winds 5 To 10 Kt, Becoming W After Midnight. Seas Around 2 Ft. Wave Detail: N 2 Ft At 6 Seconds And E 2 Ft At 9 Seconds. Patchy Frost. |
| Fri...N Winds 5 To 10 Kt, Becoming Ne In The Afternoon. Seas Around 2 Ft In The Morning, Then 1 Foot Or Less. Wave Detail: N 1 Ft At 5 Seconds And S 1 Ft At 6 Seconds, Becoming N 1 Ft At 3 Seconds And S 1 Ft At 6 Seconds. Patchy Frost In The Morning. |
| Fri Night...S Winds 5 To 10 Kt, Becoming Sw After Midnight. Seas 1 Foot Or Less. Wave Detail: N 1 Ft At 4 Seconds And S 1 Ft At 5 Seconds. |
| Sat...W Winds 5 To 10 Kt, Becoming Se In The Afternoon. Seas 1 Foot Or Less. Wave Detail: W 1 Ft At 2 Seconds And Ne 1 Ft At 4 Seconds. |
| Sat Night Through Sun Night...Sw Winds 5 To 10 Kt With Gusts Up To 20 Kt. Seas 1 Foot Or Less. Wave Detail: Sw 1 Ft At 3 Seconds And E 1 Ft At 10 Seconds. |
| Mon And Mon Night...N Winds Around 10 Kt, Becoming E. Seas Around 2 Ft. Wave Detail: E 2 Ft At 10 Seconds And N 1 Ft At 2 Seconds. |
| Tue And Tue Night...S Winds 5 To 10 Kt With Gusts Up To 20 Kt. Seas 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. |
| Area Forecast Discussion National Weather Service Boston/Norton MA 334pm EDT Thu April 25 2024 Synopsis Sprawling high pressure over northeast Ontario moves southeast over Southern New England through Friday, bringing clear skies and chilly nigheights tonight and Friday night. Unsettled pattern sets up for Sunday into early next week with shower chances. Temperatures turn milder but there is a good deal of uncertainty as to how warm Sun/Monday are. Near Term - Until 6am Friday Morning 330pm Update: Sprawling high pressure ridging in from northeast ON bringing wall to wall sunshine, dry weather and light north winds (seabreezes near the coast). It is a bit cool out with current temps inland in the low to mid 50s as of this issuance, with cooler low/mid 40s near the coasts. Center of high pressure will continue to progress SE into the Adirondacks tonight, and ridging to extend SE from it into Southern New England. Expect any seabreezes near shore to shift to land- breezes (southerlies) after sundown. Optimal radiational cooling is likely to begin tonight under clear skies, light to calm winds and very dry air in place. Thus low temperatures should reach subfreezing levels in many areas in the 20s to around 30, with lows 32-35F at Worcester and near Boston. With forecast temps, the Freeze Watch was converted over to Freeze Warnings for northern CT, all of RI and eastern coastal and southeast MA, which are where the frost/freeze program is active. Opted to keep things simple as some of the immediate city areas such as Boston, Hartford and Providence probably stay around or just above freezing, and the best chance at seeing freezes is in the outlying less urbanized areas. If you have planted crops in Southern New England, take the necessary protective actions to prevent frost or freeze related damage. Short Term - 6am Friday Morning Through Friday Night 330pm Update: Friday and Friday Night: Friday is essentially a carbon copy of today, as high pressure continues to slide southeastward into our southern outer waters. After a chilly start, full sunshine and dry weather should allow temperatures to rise into the 50s to lower 60s, with mid 50s along the southern and eastern coasts as seabreezes get going. Will have a bit of a southerly flow develop later in the day as high moves to our southeast. Friday night should again feature clear skies and favorable conditions for radiational cooling. Temps should project to be a couple degrees warmer than tonight's lows, utilizing a heavy dose of MOS guidance. That yields lows in the 30s, though a few areas which radiate well such as around I-495 in MA and NW MA could see subfreezing temps. The uncertainty in the forecast here revolves around winds, and it is possible that winds could be strong enough to preclude frost from developing. It's very close but it is possible that frost/freeze headlines could be needed again where the frost freeze program is active; but the wind speeds make it a tougher call. Long Term - Saturday Through Thursday Key Points... * Remaining dry Saturday. * Low chance for showers Saturday then again Tuesday through Thursday. * Warming trend into next week, but uncertainty remains high Saturday... Upper level ridge and surface high pressure remains centered over the region through Saturday. With subsidence aloft and very dry mid level air, skies look to remain clear with very little clouds until late Saturday afternoon when high clouds ahead of a shortwave move in. This will help moderate day time temperatures into the mid to upper 60s Saturday. With a weak pressure gradient, local sea breezes will occur again Saturday morning. However, winds begin to increase out of the south Saturday afternoon, which could keep a true sea breeze from continuing along eastern coasts. Upper level ridge axis passes to the east by Saturday night with some warm air advection ahead of the next shortwave trough. This will lead to increased cloud cover and and isolated to scattered showers. Lows stay warmer Saturday night in the upper 30s to low 40s. Sunday and Monday The center of the high pressure drops south to the Carolinas, but the upper level ridge axis continues to stretch north in SNE. Being at the top of the ridge axis, weak vort impulses, along with warm air advection aloft bring high clouds and low chances for isolated showers both Sunday and Monday. High temperatures Sunday and Monday will be very dependent on a back door cold front working in. Latest GFS (Global Forecast System) and EURO is still bringing that back door cold front through Sunday and again Monday keeping temperatures in the low 60s for Eastern MA and RI, while western MA and CT stay warmer in the 70s. However, if that cold front stays offshore Sunday, temperatures could easily top the mid to upper 70s. NBM guidance still remains significantly warmer then deterministic GFS and EURO guidance, so again used a blend of warmer NBM guidance with cooler CONSALL guidance. Temperatures Monday look to continue to warm for western MA and CT with a 30-40% chance highs top 80F per GEFS. Eastern MA and RI will still struggle to top 70F with the back door cold front stalled over SNE. Tuesday through Thursday Upper level ridge axis again moves offshore to the east, but this time, a weakening shortwave trough moves through the region, but details on exact timing and coverage of precipitation remains very uncertain. Given this is a week out, stuck with NBM for precipitation chances, which shows 30-40% chance for showers through the middle of next week. This seems reasonable given the weak forcing from the weakening trough. A cold front looks to move through behind the trough which could bring an isolated thunderstorms with it. Southerly flow Tuesday should kick the back door cold front out, however guidance remains very spread out on highs temps with ensemble 25th-75th percentiles showing anywhere from the 50s to the 70s through Thursday. Marine Forecaster Confidence Levels: Low - less than 30 percent. Medium - 30 to 60 percent. High - greater than 60 percent. Tonight through Friday Night: High confidence. Tranquil boating conditions are expected through Friday night as high pressure gradually builds southeastward into the coastal waters. Light north winds (easterly near shore) tonight and into early Friday on all waters. Later Friday, winds turn southerly around 10-15 kt. Seas 3 ft or less all waters. Outlook /Saturday through Tuesday/... Saturday: Winds less than 25 kt. Saturday Night through Sunday Night: Winds less than 25 kt. Slight chance of rain showers. Monday: Winds less than 25 kt. Monday Night: Winds less than 25 kt. Slight chance of rain showers. Tuesday: Winds less than 25 kt. Seas locally approaching 5 ft. Slight chance of rain showers. NOAA Boston MA Office: Watches - Warnings - Advisories CT...Freeze Warning from 2am to 8am EDT Friday for CTZ002>004. MA...Freeze Warning from 2am to 8am EDT Friday for MAZ007-014>024. RI...Freeze Warning from 2am to 8am EDT Friday for RIZ001>007. Marine None. |
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