Tag Archives: high pressure

NYC Weekend Weather: TS Matthew – Sep 29, 2016

We are in an active weather pattern for the entirety of the weekend, with chances for rain nearly every day. This rain is welcome and much needed, as drought persists across much of the area. Friday looks to deliver the heaviest, most persistent rain. We’re also closely monitoring the progress of Tropical Storm Matthew. While Matthew is still only in the Caribbean, it appears increasingly likely it will impact the East Coast next weekend.

Today – high pressure anchored over southern Quebec/southeastern Canada will serve to block the progress of an upper-level low that’s been drenching areas of the Mid-Atlantic. The influence of the high should keep most of the region relatively dry today, with the exception of further west in New Jersey. However, the high pressure to the east and frontal boundary siting just south of us will induce an onshore northeasterly wind, bringing cooler than normal temperatures only in the mid-60s.

usa_east

Friday – rain chances ramp up considerably Friday as the front depicted to the south edges slightly northwards. This looks to bring a batch of moderate to heavy rain onshore primarily in the afternoon and evening hours. Temperatures will be even cooler than today in the low-60s with overcast skies and that persistent northeast wind.

screen-shot-2016-09-29-at-8-08-03-am

Saturday – temperatures warm up a little into the upper-60s, but rain chances continue throughout the day along with overcast conditions.

Sunday – rain chances begin to diminish as temperatures continue to warm to around 70ºF. Even if rain doesn’t fall, it’ll still be a cloudy day.

Tropical Storm Matthew – Potential East Coast Impact?

Tropical Storm Matthew formed just east of the Lesser Antilles a couple days ago as a vigorous tropical storm and has been steadily progressing west and growing in intensity. Matthew is already a 65mph storm. It is being impacted by moderate southwesterly wind shear that will impede significant strengthening the next couple days. However, this shear is expected to ease as it moves over the warmest waters of the Caribbean. That should allow for more rapid intensification.

goes11152016273nhed9f

Of course, Matthew is far from being a threat to us now, but for days, it’s been clear from various forecast models that this storm will eventually turn north. The pivotal question for whether Matthew becomes a direct threat to us is when this turn north occurs. It’s not looking particularly good for us now, as the forecast package from the National Hurricane Center continues to suggest Matthew will eventually move up the East Coast next week.

at201614_model

NYC Weather Update – Sep 12, 2016

After a steamy end of the week last week, we get a refreshing change to fall-like weather for most of this week. The only exception will be Wednesday, when there looks to be a return to hotter temperatures.

Rest of today – high pressure is in control for today, which should yield mostly sunny conditions with high temperatures in the mid-upper 70s.

screen-shot-2016-09-12-at-12-53-52-pm

Tuesday – high pressure moves a bit further to our east, allowing for warmer air to flow in from the south. This will result in temperatures warming up to around 80ºF with sunny skies.

Wednesday – as the high pressure center above continues to move east, return flow form the south and southwest will continue to warm temperatures up and increase the humidity. High temperatures are expected to be in the mid-upper 80s.

Thursday – a weak cold front will pass through overnight Wednesday into Thursday. In the wake of this frontal boundary, a new area of high pressure will build over the Great Lakes. This will result in much cooler temperatures, in the mid-70s with a northerly wind. Thursday night, which is the Mid-Autumn Festival, should see spotless skies for moon viewing.

screen-shot-2016-09-12-at-12-56-08-pm

 

NYC Weekend Weather – Sep 8, 2016

This past week, weather headlines were dominated by the uncertain course of how Post-tropical Cyclone Hermine would unfold. Now that Hermine has dissipated and is well behind us, we look ahead to the end of the week which will start off warm, but cool off somewhat.

Rest of today – it’s sunny now, but clouds are moving in from the north and west, and will likely result in partly sunny skies later on. High temperatures will range into the upper-80s and around 90ºF in some parts.

Friday – with an area of high pressure to our southwest, warm, humid air from south will flow into the region allowing temperatures to rise into the low-90s. There is a chance for isolated thunderstorms during the afternoon.

Saturday – a frontal boundary will be lingering in our vicinity during the day. This should yield a mostly cloudy day with a chance for scattered showers and thunderstorms throughout. High temperatures will be a bit cooler, in the mid-upper 80s.

screen-shot-2016-09-08-at-1-07-02-pm

Sunday – the frontal boundary pushes through as a cold front and brings in some relief from heat and humidity. Skies will clear and allow temperatures to rise to the mid-80s.

Drought Persists, Some Relief Ahead?

Parts of our state are still dealing with an extreme drought, though in our region, we’re “lucky” enough to only have a moderate to severe drought in parts of Long Island. The monthly outlook does call for some drought relief for Long Island, though.

20160906_ny_trd

month_drought

 

NYC Weekend Weather – Aug 26, 2016

We ended this past week of refreshing, more seasonably warm weather with a hot and humid day today. This weekend, temperatures will cool off again into about normal ranges. No significant precipitation chances are forecast for the next few days. I will be on vacation next week, so no updates for a little while unless urgent comes up.

Rest of today – comfortable with highs dropping through the 80s into the mid-70s overnight.

Saturday – high pressure takes over and delivers a sunny day with temperatures in the upper-80s.

Screen Shot 2016-08-26 at 6.05.29 PM

Sunday – a tad cooler with high temperatures in the mid-80s and sunny.

Monday – the only day with a chance for rain, otherwise mostly sunny with a high in the mid-upper 80s.

Tuesday – mostly sunny with a high in the mid-upper 80s.

Drought Worsens Upstate, Some Improvement Elsewhere

Despite getting some decent rains over the last few weeks, New York State remains gripped by drought, with a severe drought no impacting upstate regions along the Erie Canal corridor.

20160823_NY_trd

NYC Weekend Weather – Aug 11, 2016

The second half of this week and this weekend will feel as though we’re living in a tropical monsoon climate zone, given the extended period of unsettled weather that we’ll be experiencing. Nearly every day over the course of the next 5-7 days, we’ll see a chance for showers and thunderstorms, some capable of producing torrential rainfall, along with a very warm and humid airmass staying in place.

Rest of today – periods of clouds and sun, likely becoming mostly cloudy this afternoon. There will be a chance for showers and thunderstorms, with the first batch appearing to arrive around lunch. High temperatures will be around 90ºF but with the very humid air, heat indexes will be well into the upper-90s. This is the reason for there being a Heat Advisory in place until Saturday evening.

Screen Shot 2016-08-11 at 10.23.27 AM

Friday – similar set up to today, periods of sun mixed in with mostly cloudy spans as well. Highs will again be around 90ºF, with a chance for showers and thunderstorms in the afternoon hours. The exact timing, placement, and intensity of the storms for Friday and this entire forecast period will be difficult to forecast with accuracy ahead of time.

This is due to the fact that many of the storms will be driven by subtle perturbations in the atmosphere moving around the periphery of a Bermuda High, and differential day time heating – hence why the chance for showers and thunderstorms is greatest in the afternoon hours. Sea breeze convergence boundaries are likely to serve as triggers for these storms. This Bermuda High is what has been and will be responsible for maintaining the oppressively hot and humid conditions. The tropical airmass it brings will mean that any storms that form will have the potential to tap into tropical moisture and produce very heavy rain that could lead to localized flash flooding.

Saturday – will be by far the hottest day of the weekend with high temperatures forecast to reach into the mid-upper 90s. Heat indexes will be in the upper-90s to low-100s in some parts, likely triggering Excessive Heat Warnings. Once again, a chance for showers and thunderstorms will occur in the afternoon hours.

Sunday – a cold front will approach the region on Sunday, which will lead to a more consistent and higher chance for organized thunderstorm activity. High temperatures will remain hot, in the low-90s.

Screen Shot 2016-08-11 at 10.24.30 AM

Monday – low confidence for the forecast through Monday, as the timing of the cold front passage is uncertain. It may linger, which would result in yet more chances for rain. High temperatures should cool off to below 90ºF in the upper-80s.

NYC Weather Update – Aug 8, 2016

The weekend gave us a mixed bag of weather, with some rain but mostly warm and humid weather. Humidity starts off at a comfortable level this week, but picks up towards mid-week when get a chance for some showers and thunderstorms. High temperatures during this period will be above average by about 5ºF, though it will not be nearly as hot as a couple weeks ago.

Rest of today – more clouds than sun for the next few hours, but we’re still expected to hit highs in the mid-80s.

Tuesday – sunny, with highs in the mid-upper 80s.

Wednesday – increased humidity, mostly cloudy with a high in the mid-80s. We will be squeezed between an incoming cold front and a high pressure center in the Atlantic, which will result in a mostly southerly flow of warmer, humid air into the region.

Screen Shot 2016-08-08 at 12.20.02 PM

Thursday – warmer, with highs around 90ºF and partly sunny skies.

 

NYC Weekend Weather – Aug 5, 2016

We’ve been able to enjoy a very comfortable week of summer weather. High temperatures have been largely held in check in the low-mid 80s this week. This weekend, there will be a chance for some rain Saturday, but Sunday will be another nice day with mostly sunny skies and high temperatures in the mid-80s.

Rest of today – mostly sunny, high around 85ºF.

Saturday – watching for the risk of scattered strong to severe thunderstorms tomorrow. The degree of severity will hinge upon how much cloud cover there is during the first half of the day, and whether any storms pop up early. If there are more clouds early, and some storms show up early, the available energy for storms in the afternoon associated with a cold front will be limited. Ahead of this cold front, warm, humid air will flow in, and temperatures should peak near 90ºF.

Screen Shot 2016-08-05 at 1.28.49 PM

Sunday – skies will clear quickly following the passage of the aforementioned cold front. High pressure begins to take over and will give us a nice, sunny day, with highs in the mid-80s.

Monday – almost a clone of Sunday with mostly sunny skies and highs in the mid-80s.

Tuesday – with high pressure still almost directly overhead, we will get another nice day with highs in the mid-80s.

Slight Improvement in Drought Conditions

With recent rounds of heavy rain and thunderstorms that have impacted the area, we’ve seen a slight improvement in drought conditions, but the situation is still far from desirable.

20160802_NY_trd

NYC Weekend Weather – Jul 28, 2016

We finally get a break from the heat along with some much needed rain in the next few days. Saturday looks to be the best day of the weekend. High temperatures this weekend will range anywhere between 15-20ºF cooler than last weekend. 

Overnight – lows in the mid-70s as a low pressure center passes almost directly over NYC. Because the low will be right over us, the main area of the heaviest rain will remain north of the city.

Friday – showers punctuated by periods of steady, heavier rain as bands of rain develop and wrap around the low pressure center as it tracks east. High temperatures in the low-80s with overcast skies. This low pressure system will thrive off the humid, tropical airmass in place over the region. A flash flood watch has been issued to reflect the possibility of some areas receiving 1-2″/hour rains. Embedded thunderstorms are possible, but are unlikely to reach severe limits. The bulk of the rain will fall overnight into the morning hours, and should begin tapering off in the afternoon from west to east. 

Screen Shot 2016-07-28 at 6.53.30 PM fill_94qwbgSaturday – high pressure passes briefly giving us a mostly dry day with partly sunny skies with highs in the mid-80s.

Sunday – another disturbance pushes through from the south providing more chances for rain and thunderstormsMostly cloudy with highs in the low-80s otherwise.

Screen Shot 2016-07-28 at 6.55.33 PM

Monday – skies gradually clear and temperatures warm back into the low-mid 80s.

Tuesday – warm and sunny with highs again in the mid-80s

Drought Conditions Forecast to Persist

Despite the rains this weekend, many parts of the area remain under a moderate drought, having received only about 25% of normal precipitation for this past month. The outlook for the season calls for persistence of drought conditions as below normal to normal precipitation will be insufficient to break the drought.

season_drought

NYC Weekend Weather – Jul 21, 2016

This weekend’s weather can be summed up in one word: hot. In fact, if current forecasts hold, this upcoming stretch may see our first extended 90ºF+ heat wave. High temperatures don’t appear likely to drop below 90ºF until next Wednesday. During that time, the humidity will actually increase until a cold front breaks through late Tuesday. This will be another prime beach/upstate getaway weekend.

Rest of today – sunny with a high around 90ºF.

Friday – mostly sunny, slightly warmer with a high in the low-90s. There is a chance for strong to marginally severe thunderstorms late Friday with the passage of a cold front. Any relief from heat that this front and storms associated with it bring will be short-lived.

Saturday – high pressure quickly returns and temperatures continue to rise along with it. Highs are expected in the mid-90s with mostly sunny skies.

Screen Shot 2016-07-21 at 9.28.34 AM

Sunday – a bit cooler, but humidity will increase as a warm front pushes through late on Sunday. High temperatures in the low-90s.

Monday – showers and thunderstorms are possible later Monday preceding a cold front that is forecast to pass on Tuesday. Highs will remain in the low-90s.

Above Average Temperatures to Stick Around

The Climate Prediction Center’s 6-10 Day and 8-14 Day temperature outlook continues to call for above normal temperatures. The heat is here to stay.

610temp.new814temp.new

NYC Weather Update – Jul 18, 2016

This week will be bookended by hot weather, with a break from the heat forecast right in the middle. The only chance for rain during this stretch will be later this afternoon and into the early evening hours.

Rest of today – the Storm Prediction Center has placed parts of the region under a slight risk of severe weather today as a cold front approaches. As usual, areas north and west of the city are more likely to experience organized convective activity, since there will be a stabilizing influence near the coast from the marine air layer. Best timing would appear to be in the evening rush, when a couple lines of thunderstorms could affect the area. High temperatures will reach into the low-mid 90s before this under mostly sunny skies.

day1otlk_1300 Screen Shot 2016-07-18 at 10.06.13 AM

Tuesday – with the passage of the the cold front above, there will be a noticeable change in the humidity level for Tuesday. Despite high temperatures reaching into the upper-80s, it will feel considerably more comfortable with the drier air in place.

Wednesday – an area of high pressure behind the cold front will take over for the latter portion of the week. On Wednesday, it will be set up just to our southwest, which will enable cooler winds from the north to bring a brief respite from the heat. High temperatures are only expected to reach into the low-mid 80s.

Screen Shot 2016-07-18 at 10.08.24 AM

Thursday – as the high pressure moves off to the east, winds will turn to the west and southwest, and there will be a corresponding increase in high temperatures into the mid-upper 80s again as warmer air returns.