Category Archives: Weekend

NYC Weather Update – Mar 27, 2014

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We’re entering into a pattern of active weather through the weekend and into early next week. Today will be dry and pleasant, though well below normal with highs only in the mid 40s.

High pressure will move east of NYC before a cold front approaches from our west on Friday. Southwest flow around the high pressure center and ahead of the frontal boundary will usher in milder, moist air from the southeast. Temperatures on Friday will be near normal in the mid 50s. As the front passes through, expect periodic rain showers throughout the afternoon hours.

Saturday – a second frontal system is forecast to spawn a low that will track offshore of the East Coast, bringing a second round of rain to the area. This round will be heavier than Friday’s, with ample moisture available for the storm to draw on. With the clouds and rain, high temperatures will be suppressed to around 50.

Sunday – there is some uncertainty about how quickly the low impacting us Saturday will exit the region. At this time, it does appear that rain will continue through portions of the day. Should the low be slow to exit, colder air could work into the system allowing for accumulating snow Sunday night! High temperatures Sunday will be in the mid 40s.

Monday – should be a fair day, dry, with high temperatures near normal in the mid 50s. So, even if it snows on Sunday, the snow will melt rapidly. Next shot at precipitation comes with another frontal system Tuesday.

Check out the cumulative quantitative precipitation forecast from the National Weather Service’s Weather Prediction Center for Thursday through Sunday morning. Note that our area is forecast to receive as much as 2.5″ of precipitation through Sunday. Also, there are pockets of as much as 4-6″ of precipitation forecast for the West Coast. For California, that’s some good news as it will help with the drought conditions, but as we saw with Oso, Washington mudslide this much precipitation in such a short span of time can lead to landslides. This is especially the case for Oregon and Washington which are no longer as drought-stricken and soil saturated from previous storms.

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Below is a NAVGEM forecast model run depicting two storms simultaneously impacting the West Coast and the Northeast on Sunday.

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NYC Weather Update – March Snowstorm? Mar 21, 2014

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This is not the news any of us want to hear, but confidence is increasing for a potential late-March snowstorm to impact the NYC area next Tuesday-Wednesday. First, the weekend forecast:

Saturday

A warm front will push through early Saturday followed by a cold front later in the day, with a slim chance for precipitation. After the passage of the warm front, gusty winds will increase from the south and southwest, ushering in some much anticipated spring-like warm air. High temperatures may top 60, but with mostly cloudy skies and the influence of the wind it will feel cooler.

Sunday

Clouds will diminish Sunday, but in the wake of the cold front, temperatures will struggle to hit the low-mid 40s. Polar high pressure continues to build overnight, with low temperatures much below average only in the mid-20s!

Monday

Fair conditions with the polar high in control, temperatures will only be in the mid-30s, nearly 15 degrees below normal for this time of year.

Tuesday and into Wednesday

An area of low pressure forecast to form offshore of the Carolinas will track into our area. Forecast models are pointing to this system rapidly strengthening with a sharp decrease in central pressure as it progresses into the waters off of Long Island. Recent model show a track closer to the 40N/70W benchmark, which increases the potential for a significant snowstorm. However, 5 days out, there’s still a good deal of uncertainty as to final track, positioning of precipitation bands, and available moisture. A track slightly further north will mean increased odds for a significant snow event, while a track too far north or south will diminish these chances.

GFS model showing a strong low pressure center consolidating southeast of Long Island around 1AM Wednesday morning.

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GEFS model (spaghetti strings show upper air circulation 552mb and 564mb). The two main bunches of the strings represent the polar and subtropical jet streams respectively. Notice the loops connecting the two streams over the our region. This is converging of energy from both streams will feed the rapidly deepening low pressure center.

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NYC Weekend Weather Update – Mar 15, 2014

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Expecting a pleasant, mild, and mostly sunny day Saturday, temps in the mid-upper 50s – if you get a chance, definitely go out and enjoy the nice weather before a storm system enters the NYC region Sunday night into Monday night.

The mild temps today are as a result of southwest winds ahead of an approaching cold front. When the cold front pushes through, winds will shift to the west, ushering gusts up to 40mph and a significantly colder air mass.

Sunday – should be another mostly sunny day, though much cooler than today with highs temps only in the mid 30s. Sunday night, increasing chance of snow begins from south to north across the area. Overnight lows into Monday only in the mid 20s.

Monday – high temps will be right about freezing near the coast, and in the mid 20s in the interior. The setup for this storm system is very similar to the last snow storm (or non-storm) on Mar 3rd. Forecast models are suggesting that the bulk of moisture and favorable dynamics for heavy snow will remain offshore. Should this scenario hold, then we’d only expect to see a dusting to maybe an inch of snow in the city and Long Island, with negligible totals further north.

During the last storm, forecasters had difficulty resolving the uncertainty about exactly where the best conditions for heavier snow would exist. Again, this time, the line is quite close. A slight adjustment northward of the current forecast track for the low pressure system that is developing over the Gulf now could result in higher snowfall totals. See below how close the areas of darker blue representing moderate precipitation are to our area!

Screen shot 2014-03-15 at 11.29.13 AMTuesday – a dry and sunny day, but with temps still suppressed in the mid 30s in the city as a high pressure system temporarily sits over the NYC area.

Wednesday – the next low pressure system to impact the area will be moving in from the Great Lakes, with a low pressure center sliding to our north and a trailing cold front. Temps will climb into the low-mid 40s ahead of the cold front, so precipitation would be mixed to mostly rain.

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The end of the week looks to be dry with highs near normal (around 47-49 deg at this time of the year).

NYC Weather Update, Monday Storm – Mar 1, 2014

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Summary

March is coming in like a lion this year (let’s hope it leaves like a lamb), with yet another snow storm to add to our misery here in the NYC area Sunday night into Monday night.

Background

A strong coastal storm that’s currently pummeling California with heavy rain and snow will be transferring its energy and moisture to the aforementioned storm. For California, the rain and snow is a mixed blessing: with a hundred-year drought gripping the region, moisture is welcome; however, so much rain in such a short time window is leading to flash flooding, mudslides, and other headaches. See the video below:

Forecast

Our local NWS forecast office has issued a winter storm watch for Long Island, NYC, and central NJ on south. The latest snow maker will be two waves of low pressure that will travel along the length of an arctic cold front Sunday and Monday. This cold front will across our area during this period, ensuring that the air will be cold enough for all snow during the strongest part of the storm, although precipitation may start off as a rain/snow mix during the day Sunday with highs expected to be in the mid 30s.

The forecast graphic below depicts probabilities of snowfall accumulations at least 6″ or more across the region from 8PM Sunday through 8PM Monday. As you can see, we are right on the cusp of a high confidence zone for more than 6″. As it stands, 6″ seems to be the going number for the areas under the winter storm watch. A slight northward adjustment of the storm track would increase the chances we get more than 8″.

This will be a prolonged weather event – so, moderate snow for a longer time, but less of the heavy snow that we saw with the last storm.

Screen shot 2014-03-01 at 1.50.16 PMOvernight lows on Sunday will be around 20 in the city, and highs Monday will be in the mid 20s, with the cold air flowing in behind the cold front.

Extended Forecast

Things settle down after the storm passes Monday, with mostly clear and dry conditions Tuesday through Thursday. High pressure will dominate, bringing these clear conditions, but also extending the cold snap well into next week as it continues to pump Canadian air into the area. Highs will continue struggling to reach the mid-upper 20s, with overnight lows in the teens at the coast and single digits in the interior.

Interesting note: some of the GFS (Global Forecast System) models are showing the potential development of a strong coastal storm next weekend. Of course, it’s far too early to talk specifics about precipitation type and amounts as this storm may not materialize. The models are fairly consistent in developing a low over the northern Gulf of Mexico, however, a frontal system also develop to be strong enough to push this storm well offshore as it approaches the region.

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NYC Weekend Weather Update & CA Storms – Feb 27, 2014

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First up for the NYC area is a bitterly cold end to the work week.

A reinforcing arctic cold front is set to push through the area during the day today, perhaps spurring a few scattered moderate-heavy snow showers. Accumulation, if any, should be light. Behind this frontal boundary, a west wind between 15-20mph will usher in some of the coldest low temps we’ve seen in recent weeks. Lows in the city are forecast to be in the low teens, with zero to single digits in the interior. Wind chill values tomorrow morning will hover around zero.

Friday will be a sunny day with high pressure moving in. Despite the sunshine, temps will struggle into the 20s across the region.

Saturday, a weak frontal system moves through, but with dry atmospheric conditions, little if any snow is expected. Highs will be in the low-mid 30s.

Sunday-Monday, a prolonged winter weather event is forecast. The storm system currently impacting the west coast (see below) will move over the interior of the country, reorganize, and strengthen over the Midwest. This will lead to a stalled cold front draping across our region with multiple low pressure centers to slide along this front. One of these is forecast to develop into a potentially significant coastal storm. Models are coming into agreement that this storm center could pass close to the 40N 70W benchmark sweet spot.

The duration of the storm, starting Sunday night through Monday night means that it could result in significant snowfall, even with possible mixing in with sleet/rain near the coast during the day Monday. Still too early to tell how much snow – will keep monitoring the situation. High temps on Sunday will be in the mid 30s, then drop back into the low 30s for Monday.

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Too much of a good thing for California?

As I noted in earlier posts, and as has been broadcast by the media, California remains in the grips of a crippling drought. A strong pacific storm system is spinning up multiple bands of heavy precipitation during the end of this week. While that is some good news for the drought, the intensity of the rainfall could lead to mudslides, and localized flooding. The best news out of this storm is that elevations over 7000′ are expected to pick up as much as 1-3′ of snow, adding to a paltry snowpack thus far. Check out the graphic from the San Diego NWS station for a look at the heavy rain fall totals expected (5-7″ in higher elevations near the coast with south facing slopes!).

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NYC Midweek Weather – Feb 19, 2014

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Sorry about the lapse in posts! Tuesday ended up being a pretty active weather day with showers moving through the area (thank goodness temps were warm enough so that it wasn’t more snow).

Your weather forecast for this week: rain has already dissipated across the region. Thursday starts out as a mostly sunny day, and highs should top out in the low-mid 40s, slightly above average in the city. Clouds will build throughout the day as a frontal system approaches from the west. Overnight Thursday, chances of precipitation increase along with the passage of a warm front.

Friday, temps continue to increase to the mid 50s ahead of an approaching cold front. Expect a mostly cloudy day, with showers and the potential for a line of stronger thunderstorms accompanying the frontal boundary passing in the afternoon.

Things dry out this weekend, with temps falling back to the mid 40s Saturday and Sunday. Another reinforcing cold front passes through Sunday, dipping high temps in the beginning of next week into mid 30s, below the average of around 40. No major storms on the horizon past Friday!

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NYC Weekend Weather Update – Feb 15, 2014

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We will be feeling the impacts of yet another storm, in what seems like an endless winter. A low pressure system currently over Cape Hatteras will move offshore into the Atlantic shortly. Once it does so, it is forecast to strengthen rapidly as it moves northeast towards the 40N 70W benchmark, which is associated with prime conditions for growth of strong nor’easters and winter storms.

Currently, forecast models are showing the brunt of the storm hitting Southeastern Mass and New England. In areas, the NWS office in Taunton is confident that there could be up to 12-15″ of snow, in addition to strong winds in excess of 50mph that have led to blizzard warnings for east facing shores of Mass including the Cape.

Impact

For our area, eastern Long Island is expected to see enough of a heavy snow band forecast to rotate around this storm to have winter storm warnings issued. These areas could see 6-8″+ of snow from this storm. Projected snowfall totals drop significantly as you go west, with mid-Island and Central Connecticut forecast to see 4-8″, and points west (including NYC) receiving 2-4″. Wind will also be a factor with a tightening pressure gradient caused by the rapid intensification of the coastal low.

Timing

Light snow is already falling over the area now, but the worst of this storm should take place in the evening and overnight hours. Snow and wind should pick up in intensity from southeast to northwest throughout the day. If you have made plans to travel along the NYC-Providence-Boston corridor, expect travel conditions to become hazardous this evening/night. The most intense part of this storm will be ongoing from about 6PM-1AM, but accumulating snow will begin around 3PM.

Notes

As with most storms this winter, there is still uncertainty as to the final track of the storm. Should the storm track slightly westward, and the deformation axis determining where a heavy band of snow progresses further inland, then areas west of where current winter storm warnings exist could see significantly higher snow accumulation. There is also some indication that a norlun trough might form, leading to a intense snow band projecting west/northwest from the center the coastal low. If this feature does develop, areas that this trough sits over could see much higher than projected snowfall.

Satellite image of the incoming storm below:

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NYC Weekend Weather – Feb 14, 2014

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Check out this impressive satellite image of the nor’easter that hit us yesterday. It’s now offshore of southeast Maine, and has strengthened considerably, taking on a classic “comma head” structure that is a hallmark of strong surface low storm systems.

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Don’t shoot the messenger, but we are forecast to get even more snow Saturday. A clipper system to our northwest over Michigan will combine with another low pressure system moving into the Carolinas later today. Once this system moves offshore, it will begin strengthening and growing into another nor’easter. Luckily, forecast models are currently showing much lower amounts of available moisture (precipitable water) for this upcoming storm. In addition, even though the storm is forecast to pass near us, the bulk of the precipitation is currently forecast to remain over the open ocean. What this means is that we should only see light accumulations of snow, on the order of 1-3″. However, as with the previous storm, there is still a little uncertainty about the final track of this storm, and changes could lead to higher snowfall amounts.

Otherwise, expect milder temps today with windy and sunny conditions prevailing, temps in the low 40s. This should help some of the snow to melt. We should have clear skies for part of the evening to see the full moon on Valentine’s Day. Clouds move in overnight, with snow showers during the day Saturday and a high in the mid 30s. Another weaker clipper system moves in Sunday with another chance for light snow and high temps around freezing. Yet another system is forecast for Monday night into Tuesday, which looks to be snow to start and snow transitioning to rain on Tuesday. Monday’s high near freezing with a warm up Tuesday ahead of the frontal system moving in.

Here’s a graphic showing the snowfall totals from around the area from this last storm.

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