Cape Cod Bay Alt Marine Forecast
| Today...Sw Winds 5 To 10 Kt. Gusts Up To 20 Kt This Afternoon. Seas 1 Foot Or Less, Then Around 2 Ft This Afternoon. Wave Detail: W 1 Foot At 4 Seconds And Ne 1 Foot At 5 Seconds, Becoming Sw 1 Foot At 2 Seconds And Ne 1 Foot At 5 Seconds. A Slight Chance Of Snow Showers This Afternoon. |
| Tonight...W Winds 10 To 15 Kt With Gusts Up To 20 Kt. Seas Around 2 Ft. Wave Detail: W 2 Ft At 3 Seconds And E 1 Foot At 6 Seconds. |
| Fri...W Winds 10 To 15 Kt. Seas Around 2 Ft. Wave Detail: Nw 2 Ft At 4 Seconds And Se 1 Foot At 7 Seconds. |
| Fri Night...Nw Winds 10 To 15 Kt. Seas Around 2 Ft. Wave Detail: Nw 2 Ft At 4 Seconds And Se 1 Foot At 7 Seconds. |
| Sat And Sat Night...Sw Winds 15 To 20 Kt With Gusts Up To 25 Kt. Seas 2 To 3 Ft. Wave Detail: Nw 2 Ft At 4 Seconds And Se 1 Foot At 7 Seconds. |
| Sun Through Mon Night...Sw Winds 20 To 25 Kt. Seas 2 To 4 Ft. Wave Detail: Sw 3 Ft At 4 Seconds And Se 1 Foot At 5 Seconds. 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. |
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Area Forecast Discussion National Weather Service Boston/Norton MA 632am EST Thu Jan 23 2025 Synopsis Temperatures moderate today into Saturday but remaining below normal. Other than scattered snow showers on the Cape and Islands today and passing snow showers associated with a Clipper low pressure area Sunday, mainly dry weather is expected into early next week. Temperatures are expected to rebound to near seasonable normals for Sunday into early next week. Near Term - Until 6pm This Evening 6:30AM Update: Increasing clouds with a few flurries this morning as a mid-level warm front moves across the region. While not as cold as yesterday morning, it is still chilly with temperatures in the single digits to low teens. Forecast continues on track and no notable adjustments during this update. Previous discussion below... Mid level shortwave from the west will be moving into SNE 18-00z. A weak low pressure well to the south will bring a plume of deeper moisture which is likely to remain just offshore. However, the NW extent of the moisture may get close enough to bring some snow showers to the Cape/Islands today. Soundings show moist layer up to about 850 mb but pretty dry above that in the 800-700 mb layer. Not expecting much accums, perhaps a coating to 1/2" in a few spots. Otherwise, area of mid-high level moisture moving into SNE around 09- 12z will lifting to the north by 15z leading to clouds giving way to partly to mostly sunny skies from west to east in the afternoon. 925 mb temps are moderating today which will bring milder temps but still several degrees below normal with highs mostly upper 20s to lower 30s, colder higher terrain. Short Term - 6pm This Evening Through 6pm Friday Tonight... Mid level shortwave moves to the east this evening and will be followed by low level NW flow and subsidence. Mainly clear skies are expected with perhaps some strato-cu developing over the Berkshires. Winds will be light so good radiational cooling will result in low temps dropping into the single numbers and teens. Friday... SNE will be in between shortwaves to the north and SW with dry low level NW flow persisting. Mostly sunny skies are expected with similar temps to today as there is little change in low level temps. Highs will be mostly upper 20s to lower 30s with a modest NW breeze. Long Term - Friday Night Through Wednesday Key Messages: * Benign weather and mainly dry conditions for much of the region for the extended forecast. A weak clipper system, passing to our north on Sunday could lead to a couple of light snow showers for far western southern New England. * Seasonably cold on Saturday, followed by near normal temperatures Sunday through at least Tuesday. Benign weather continues for much of the extended forecast period with a 1030mb +/-5mb high pressure anchored across the eastern third of the CONUS. Will have a couple of very weak disturbances traverse the region, but not expecting any notable impacts. On Sunday, a weak area of low pressure associated with a subtle mid-level trough and shortwave cross northern New England. There is very little moisture associated with this, PWATs (Precipitable Waters) are less than 0.2", at best there would be potential for snow showers in western MA and northwest CT. Did keep 'slight chance' POPs in those locations. As prior discussions mentioned, there is no significant systems on the horizon. Guidance has high pressure to our south through the middle part of next week, but a couple of moisture starved clippers dive out of Canada and cross northern New England between Monday and Wednesday. The ensembles paint a pretty dry picture, with limited opportunities for Quantitative Precipitation Forecast. Seasonably cold temperatures for Saturday, highs between upper 20s and low 30s. That is followed by a relative warm-up between Sunday and Tuesday, highs reach the middle to upper 30s and overnight lows in the upper teens and low 20s. Heading towards the middle part of next week brings the chance for another surge of Arctic air and below normal temperatures. Marine Forecaster Confidence Levels: Low - less than 30 percent. Medium - 30 to 60 percent. High- greater than 60 percent. Today... Increasing SW winds today 10-20 kt with a few 20-25 kt gusts possible over NE MA waters, but confidence was not high enough to issue SCAs. Tonight and Friday... Wind shift to NW 10-20 kt tonight and continuing Friday. Seas below SCA. Outlook /Friday Night through Monday/... Friday Night through Saturday: Winds less than 25 kt. Seas locally approaching 5 ft. Chance of freezing spray. Saturday Night: Low risk for Small Craft Advisory winds with gusts up to 25 kt. Local rough seas. Sunday: Moderate risk for Small Craft Advisory winds with gusts up to 25 kt. Areas of rough seas. Sunday Night: Low risk for Small Craft Advisory winds with gusts up to 25 kt. Local rough seas. Monday: Moderate risk for Small Craft Advisory winds with gusts up to 30 kt. Local rough seas. NOAA Boston MA Office: Watches - Warnings - Advisories CT...None. MA...None. RI...None. Marine None. |
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