Weekend Outlook: September 17-20, 2021

Improving weather is coming, but it will take a little while to get here this weekend.

A frontal system will wash out along the South Coast tonight and Friday while high pressure tries to build in. The result will be mainly dry conditions, but still plenty of cloud cover, especially along the South Coast. Temperatures will remain on the cool side compared to the last few days thanks to northeast to east winds, but we should still see most places get into the 70s.

Skies are clearing out not far to our north and west, Meanwhile, low pressure is trying t organize off the Carolina coast. Loop provided by NOAA.

Meanwhile, an area of low pressure off the Carolina coast is trying to organize this afternoon and it could become a tropical depression or even a weak tropical storm over the next day or so. It will move northward and then northeastward, passing well south and east of us Friday night and Saturday. However, it will bring some gusty northeast winds to coastal areas, and churn up the seas again, resulting in some rough surf and rip currents at the beaches.

Forecast tracks for the disturbance off the Carolina coast from the various members of the GFS Ensemble. Image provided by Weathernerds.org

A weak cold front will also be moving in on Saturday, with a few showers possibly accompanying it. For later Saturday into Sunday and Monday, we’ll have high pressure building in, which means sunshine and mild temperatures, which is about as good as it gets for the final weekend of astronomical summer. Fall begins with the autumnal equinox at 3:20pm next Wednesday.

Average high temperatures in mid-September are in the lower to middle 70s around here. Image provided by Weathermodels.com

Thursday night: Mostly cloudy, chance for a few showers across the South Coast and Cape Cod. Low 58-65.

Friday: Partly to mostly cloudy. High 70-77.

Friday night: Partly to mostly cloudy. Low 60-67.

Saturday: A mix of sun and clouds, slight chance for a shower, mainly well north and west of Boston. High 72-79.

Saturday night: Mostly clear. Low 57-64.

Sunday: Plenty of sunshine. High 69-76.

Sunday night: Clear skies. Low 50-57.

Monday: Unlimited sunshine (daylight hours only). High 71-78.

Nicholas Soaks Texas, More Systems Coming?

As we enter the climatological peak of Hurricane Season, the Atlantic is getting active again.

The Atlantic is getting active again. Image provided by the National Hurricane Center.

The main focus right now is Tropical Storm Nicholas, centered about 105 miles south of Port O’Connor, Texas, moving northward at 12 mph. Maximum sustained winds are near 60 mph. A Hurricane Watch, Tropical Storm Warning, and Storm Surge Warning are all in effect for much of the Texas coastline. The good news is that Nicholas doesn’t have too long to strengthen, as landfall is likely along the Texas coastline this evening. The bad news is that it will be a prolific rain-maker for Texas (and Louisiana). Rainfall totals of 8-16 inches and locally heavier will produce widespread flooding across the region, including the Houston metropolitan area.

Very heavy rain is likely in southeastern Texas and Louisiana this week, Image provided by Weathermodels.com

While heavy rain and resultant flooding are the main threat with Nicholas, they aren’t the only threat. Tropical Storm force winds are already impacting the Texas coast, and will continue into tonight. With Nicholas expected to be close to hurricane strength at landfall, wind gusts may exceed 70 mph along the coast. Storm surge is the other concern. A surge of up to 5 feet is possible near and just to the right of where the center makes landfall. This will result in coastal flooding, in addition to the freshwater flooding that the heavy rain will produce.

Nicholas is the only active system in the Atlantic right now, but it’s not the only system that we’re keeping an eye on. A tropical wave that just moved off the coast of Africa is disorganized right now, but should move into an area of favorable conditions as it continues westward this week. It could become a tropical depression toward the latter half of the week, but it is still at least a week away from impacting any land areas, if it ever does. We’ve got plenty of time to watch this one as it makes its way westward.

Forecast tracks from the various members of the GFS Ensemble for the system that just moved off of Africa. Image provided by Weathernerds.org

A little closer to home, we need to keep our eyes on the Bahamas. Many of the forecast models are showing the potential for a cluster of storms near the Bahamas to interact with a tropical wave, and organize into a low pressure area later this week. Most of these models keep the system fairly weak, but it could become a tropical depression or even a weak tropical storm as it makes its way northward over the warm waters of the Gulf Stream. At the very least, it should bring some rainfall to parts of the East Coast, but there’s a chance that the leftover moisture from Nicholas could be infused into the system, which would enhance the rainfall with the system. We’ll have to watch this system to see if it develops, and if so, how it develops, to get a better idea of what, if any, impact if will have on the East Coast.

Much of the East Coast is clear (aside from some smoke) today, but the cluster of storms near the Bahamas should be watched. Loop provided by NOAA.

Typhoon Chanthu continues to slowly weaken in the Western Pacific. After grazing Taiwan over the weekend it has moved northward, but has slowed down off the eastern coast of China, just east of Shanghai. It is expected to resume moving northeastward on Tuesday while continuing to weaken, passing near or just south of South Korea on Wednesday as a tropical storm. Gusty winds and heavy rain are expected, especially in southern portions of South Korea.

Forecast track for Typhoon Chanthu. Image provided by the Korean Meteorological Administration.

Finally, we’ll leave you with this. Former Hurricane Larry remains a powerful storm near Greenland at this time. Over the weekend, it dropped up to 4 feet of snow on the island, and more is falling today. It is already beginning to impact Iceland, where winds have gusted to 46 mph at Reykjavik today. We may be at the peak of hurricane season, but the fall and winter are not far away for those of us in the Northern Hemisphere.

Former Hurricane Larry is burying Greenland with heavy snow and will impact Iceland over the next day or two. Loop provided by NOAA.

Weekly Outlook: September 13-19, 2021

A return to a wet pattern appears to be heading our way for a chunk of the upcoming week.

The week is actually going to start off with a line of showers and thunderstorms crossing the region this morning. Depending on when you read this, they may already be offshore. As the line moves through, they’ll produce some gusty winds, lightning, and downpours, especially north of the Mass Pike. Once they finally move through, high pressure will build in, with a rather nice day expected today. Unfortunately, today is the best it will be for a while. Winds will shift into the east on Tuesday, bringing in some clouds, but also cooler temperatures. A warm front will move through at night, with some showers accompanying it.

The line of showers and thunderstorms should weaken as it moves through this morning. Loop provided by Weathermodels.com

The middle to latter portion of the week looks the most unsettled, but also has the most uncertainty associated with it. Wednesday looks like a warm and humid day, but we’ll have a cold front approaching, which will likely produce some showers and thunderstorms. Depending on the timing of the front, which is still a big question, some of those storms could become strong to severe. Behind the front, cooler weather will settle in on Thursday, but with the front stalled out nearby, and a southerly flow aloft, we’ll still have plenty of moisture around, so more showers are likely.

Wednesday is looking quite warm, especially for mid-September. Image provided by WeatherBell.

This brings us to Friday, which is the day with the most uncertainty at this point. We’ll continue to have tropical moisture flowing northward into the region, so more rainfall is likely. The question is, will it just be a steady stream of moisture, or will it organize into a system? Some of the models do try to develop it into an organized low pressure area, which could become a tropical depression or even a tropical storm. As of their early morning update, the National Hurricane Center gave the system a 50% chance of developing into a tropical depression over the next 5 days. (We’ll have a more detailed post on the tropics this afternoon, where we’ll take a look at this system, Tropical Storm Nicholas, which will bring heavy rain to Texas, and two other systems we’re watching in the Atlantic.) Further complicating things is the potential for the remains of Nicholas to get infused into the system, resulting in even more rainfall. Either way, it looks like Friday will be a cool, wet day, with the potential (for now) for heavy rainfall. Moisture may hang around on Saturday with plenty of clouds and possibly some more showers. Sunday may see some clearing, but that’s a low-confidence forecast right now.

As you’d expect in mid-September, the Atlantic is fairly active right now. Image provided by the National Hurricane Center.

Monday: Showers or thunderstorms early this morning, becoming partly to mostly sunny. High 73-80.

Monday night: Clear to partly cloudy. Low 54-61.

Tuesday: Some early sun, then clouds filter back in. High 68-75, coolest along the coast.

Tuesday night: Becoming mostly cloudy with showers developing. Low 60-67.

Wednesday: Mostly cloudy, chance for showers and thunderstorms, especially late in the day and at night. High 79-86.

Thursday: Cloudy with occasional showers. High 70-77.

Friday: Cloudy and cool with a chance of rain. High 69-76.

Saturday: More clouds than sun, chance for some more showers. High 73-80.

Sunday: A mix of sun and clouds. High 77-84.

Weekend Outlook: September 10-13, 2021

We have got an absolutely fantastic stretch of weather on tap for the upcoming weekend.

Sunday is looking like a rather warm day for mid-September. Image provided by WeatherBell.

Before we get to the nice weather, we’ve got some rain tonight as a cold front crosses the region. The rain will end from west to east tonight, and skies will start to clear out by daybreak. On Friday, we’ll have an upper-level disturbance moving through. So we’ll start off with sunshine, but clouds will develop, and a few pop-up showers are possible. We’ll clear out again Friday night as high pressure builds in. With clear skies and light winds, we’ll have radiational cooling, which could result in a rather cool night in some spots. Saturday will feature sunshine and mild temperatures. As the high slides offshore, we’ll warm up on Sunday, just in time for the Patriots season opener in Foxborough. Another cold front will move through on Monday with some clouds and a few showers. There is the chance that Monday may not be as nice as we’re currently forecasting it to be. Some of the newer model runs are going for a cloudy day with more rainfall and cooler temperatures. This is a shift from what they had been previously been showing, so we’re not going to jump on that bandwagon yet, but we’re keeping an eye on it.

Will it rain Monday? Some models say yes, some don’t. We’ll see what happens. Images provided by Pivotal Weather.

Thursday night: Showers ending followed by some clearing late at night. Low 57-64.

Friday: Sunshine and some afternoon clouds, maybe a shower or two. High 68-75. Offshore: Northwest wind 10-15 knots, gusts to 20 knots, seas 3-6 feet, up to 6-9 feet in the waters south and east of Cape Cod and the islands.

Friday night: Clear and cool. Low 49-56.

Saturday: Sun, sun, and more sun. High 69-76. Offshore: West winds 5-15 knots, seas 3-5 feet, up to 5-8 feet in the waters east of the Cape and Islands.

Saturday night: Clear skies. Low 57-64.

Sunday: Sunshine and a few clouds. High 76-83. Offshore: West to southwest winds 10-20 knots, seas 3-5 feet.

(Kickoff Forecast for Foxborough: Sunny, temperature near 80, southwest winds 10-15 mph.)

Sunday night: Partly to mostly cloudy. Low 60-67.

Monday: Intervals of clouds and sun, chance for a few showers. High 74-81. Offshore: West to southwest winds 10-20 knots, seas 3-6 feet.

Weekly Outlook: September 6-12, 2021

The first full week of September will turn out to be rather nice for the most part.

We’re starting things off this Labor Day morning with some clouds and lingering showers, but skies should clear out this afternoon as a cold front pushes offshore. As an upper-level disturbance rotates through, we could see a stray shower or thunderstorm pop up in the afternoon, mainly north and west of Boston. Clear skies, light winds, and low humidity will result in radiational cooling tonight, which means it could be rather cool in some spots when you wake up Tuesday morning. High pressure builds in for Tuesday, resulting in a rather fine and dandy day with seasonably mild temperatures.

Normal high temperatures for early September are generally in the middle 70s. Image provided by Weathermodels.com

Humidity returns on Wednesday as a warm front moves through, but right now, it looks like most of the shower activity will hold off until after dark. Showers are likely at night, with a rumble of thunder possible as well. The showers end on Thursday as a cold front moves through the region. The end of the week and the weekend look dry with high pressure building back in. Another front may start to approach late Sunday with more clouds, but again, it looks like any shower activity should hold off until nightfall.

Hurricane Larry should be passing well to our east late this week, but it will generate large swells that will impact the beaches and coastal waters late in the week and into the weekend. This will increase the threat of rip currents. Keep this in mind if you’re planning to head to the beach or out on a boat late this week.

Hurricane Larry will send large waves toward the shoreline late this week. Image provided by WeatherBell.

Monday: Any lingering showers end in the morning, then becoming partly to mostly sunny with a slight chance for an afternoon shower or thunderstorm. High 74-81.

Monday night: Clear skies. Low 53-60.

Tuesday: Sunshine and a few clouds. High 71-78.

Tuesday night: Clear skies. Low 55-62.

Wednesday: Sunshine fades behind increasing clouds, breezy, showers develop at night. High 77-84.

Thursday: Mostly cloudy with some showers likely, ending during the afternoon. High 72-79.

Friday: Partly to mostly sunny. High 70-77.

Saturday: Sunshine and a few clouds. High 71-78.

Sunday: A mix of sun and clouds. High 72-79.

Weekend Outlook: September 3-6, 2021

After yet another deluge, the unofficial end of summer will feature mostly dry weather.

Over the past 60 days, most of the region has received 2-3 times the normal amount of rainfall. Image provided by WeatherBell.

High pressure builds in tonight with dry and cool conditions. Friday will remain mostly dry with high pressure in control, but an upper-level low will slowly pull away and a disturbance riding around it will produce some clouds, and possibly a sprinkle or shower Friday afternoon. The high slides offshore on Saturday, keeping us dry, but temperatures will start to warm up once again. A weak frontal system moves through on Sunday with plenty of clouds, and a few showers Sunday afternoon and night. The system pulls away on Labor Day and high pressure builds back in, with dry and seasonably warm conditions returning.

Labor Day looks it will be seasonably warm once the skies start to clear out. Image provided by Weathermodels.com

Thursday night: Clear and cool. Low 49-56.

Friday: Sunshine and some afternoon clouds, chance for a sprinkle or shower during the afternoon. High 66-73. Offshore: Northwest winds 5-15 knots, seas 2-4 feet.

Friday night: Becoming mostly clear. Low 51-58.

Saturday: Plenty of sunshine. High 71-78. Offshore: Northwest to west winds 10-15 knots, seas 2-4 feet.

Saturday night: Increasing clouds. Low 53-60.

Sunday: Mostly cloudy, showers possible late in the day. High 70-77. Offshore: Southwest winds 10-15 knots, gusts to 20 knots, seas 2-4 feet.

Sunday night: Cloudy with occasional showers. Low 59-66.

Labor Day: Any showers end early, becoming partly sunny in the afternoon. High 74-81. Offshore: Southwest winds 5-15 knots, seas 3-5 feet.