Look Out! Heavy Snow and Strong Winds Are Heading to the Northeast

Bigfoot takes on a Boston nor'easter. Image Credit: Kayana Szymczak/Getty Images

A major nor’easter will bring heavy snow and gusty winds to the northeastern megalopolis on Thursday, February 9, dropping at least a half-foot of snow across the most heavily populated region of the United States. The dose of intense winter weather will snarl travel and likely bring daily life to a halt through the beginning of the weekend. The heaviest accumulations are possible between New York City and Boston, where some locations could see a foot or more of snow by sunrise on Friday.

The catalyst behind the classic winter storm is a strong disturbance digging its way east across the country. The same system that will trigger the nor’easter brought snow and subzero temperatures to the Upper Midwest earlier this week; morning lows dropped lower than -20°F in North Dakota and Minnesota on Wednesday morning. The upper-level trough will cause a low-pressure system to develop at the surface in Virginia on Wednesday night. This low will quickly strengthen as it moves over the Atlantic Ocean and tracks parallel to the East Coast. It’s a scene that repeats itself every winter—one that snow lovers and winter haters alike are all too familiar with.

The Weather Prediction Center’s most likely snowfall forecast for the three-day period beginning at 7:00 AM EST on Thursday, February 9, 2017. Image Credit: Dennis Mersereau

The latest forecast from NOAA’s Weather Prediction Center calls for about half a foot of snow between eastern Pennsylvania through southern New England. The greatest chance for heavy snow stretches from northeastern Pennsylvania through eastern Massachusetts, where the most productive snow bands are expected to develop. Precipitation will begin on Thursday morning in the Mid-Atlantic and work its way north through the afternoon hours. The last of the snow should taper off on Friday morning in New England. It’s worth noting that there will be a relatively sharp gradient between having to crack out the shovel and a dusting on the grass—a boundary that’s likely to set up right along the Mason-Dixon Line. Precipitation will fall mostly as snow north of this line, while the storm will start as rain and could end as some snow to its south. It’s likely too warm for the Washington D.C. area to see more than a light coating of snow at the most, but its far northern suburbs could see a few inches from this system.

A weather model simulation of the nor’easter on Thursday morning, showing the heaviest snow bands on the northwest side of the storm. Image Credit: Pivotal Weather

Like so many nor’easters before it, this storm will play tug of war between unusually warm temperatures to the south and bitterly cold Arctic air to the north. The sweet spot for the heaviest snow will be where the cold air intersects with the area that has the highest moisture and the strongest lift, a region called the deformation zone. The deformation zone is almost always on the northwestern side of nor’easters, resulting in a swath of heavy snow that parallels the coast. Sometimes the heaviest snow bands set up far enough inland to miss the big cities, and sometimes they form right over the cities and result in those blockbuster blizzards that people remember for years.

The fact that the heaviest snow falls in such a narrow area makes forecasting nor’easters a tricky business. Warm air is a plague in East Coast winter storms; it can turn a potential snowstorm into an icy disaster or just a cold, miserable rain. A small eastward or westward shift—just one or two dozen miles—can render a snowfall forecast completely useless. This happened just last month during the significant snowstorm in the Carolinas and Virginia. The storm tracked a little farther inland than expected, allowing warm air to chew away at the snow and result in mostly ice around cities like Raleigh, North Carolina, while giving heavier snow to Greensboro, two hours to the west of Raleigh.

Temperatures have been a roller coaster leading up to this snowstorm, and that trend will continue soon after it leaves. It’s been so warm on the East Coast lately that some cities are easily setting daily high temperature records, including Washington D.C’s major airports on Tuesday and every airport around New York City on Wednesday. Temperatures behind the nor’easter will remain frigid during the day on Thursday and Friday as Arctic air drains in with the westerly winds behind the storm, aided by the icebox effect of having snow on the ground. Low temperatures on Thursday night will fall into the teens and single digits in areas with snow on the ground, and high temperatures on Friday will struggle to climb out of the 20s. Highs will quickly climb back above normal on Sunday and last through early next week, helping to melt any snow that falls from this hard-hitting but ultimately fleeting burst of winter.

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A common bit of folklore from tornado-prone parts of the U.S. says that when the skies start taking on an emerald hue, it's time to run inside. But why do tornadoes tend to spawn green skies in the first place? As SciShow's Michael Aranda explains, the answer has to do with the way water droplets reflect the colors of the light spectrum.

During the day, the sky is usually blue because the shorter, bluer end of the light spectrum bounces off air molecules better than than redder, longer-wavelength light. Conditions change during the sunset (and sunrise), when sunlight has to travel through more air, and when storms are forming, which means there are more water droplets around.

Tornadoes forming later in the day, around sunset, do a great job of reflecting the green part of the light spectrum that's usually hidden in a sunset because of the water droplets in the clouds, which bounce green light into our eyes. But that doesn't necessarily mean a twister is coming—it could just mean a lot of rain is in the forecast. Either way, heading inside is probably a good idea.

For the full details on how water and light conspire to turn the sky green before a storm, check out the SciShow video below.

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Not every kid dreams of being an on-air meteorologist, but for young ‘uns obsessed with storm forecasts and local weather reports, a new contest presents a unique opportunity to live out their dreams. The Mini Meteorologist Contest, sponsored by Lands’ End, will give four kids a chance to present a weather report on The Weather Channel this summer.

The nationwide contest is open to future meteorologists in the U.S. and Canada ages 6 to 16. To enter, they just have to write an essay between 50 and 500 words long on why they love learning about science and weather and why they’d like to be a meteorologist for a day. Four winners will receive a trip for them and their parents to The Weather Channel’s headquarters in Atlanta. They’ll have the opportunity to report the weather for the show on July 12, which happens to be National Summer Learning Day.

The essays will be judged based in equal parts on creativity, grammar, and the entrant’s love of meteorology. The only rules for the essays are that they can’t mention any products or brands other than Lands’ End or The Weather Channel (so no essays about how L.L. Bean inspired your love of cloud formations, kids) and has to be the child’s original work. Kids who are chosen as semi-finalists will have their on-air presentation skills judged in a Skype interview.

Should they win, they’ll get an inclusive trip to Atlanta with media training, a tour of The Weather Channel headquarters, and a $500 Lands’ End gift card to get just the right weather-reporting wardrobe.

The deadline for entering is May 21. Essays can be submitted here.

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