Posts

John Homenuk

2/9 PM Zones: Storm exits, more to come in New England

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Snow is wrapping up from west to east throughout the area this evening, including parts of Long Island where snow has lingered for the longest today. A low pressure center moved from the coast of New Jersey to a position south of New England — in fact, quite close to the 40/70 “Benchmark” for impactful storm systems. Impactful snow moved from Northeast NJ and NYC through Long Island and Connecticut, and now is positioned near Southern New England.

The storm system will continue wrapping up and pulling further eastwards as the evening goes on tonight. As low pressure moves away from the Northeast US, northwesterly winds will gradually allow drier air to move into the region. A developing pressure gradient between the low pressure center and an incoming high pressure will lead to the potential for gusty winds through the evening. This will be especially true near the area coasts, where gusts may exceed 35 miles per hour at times.

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John Homenuk

Midweek winter storm expected across interior New England

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A fast moving, active weather pattern will continue over the next several days throughout the Northeast US. In the midst of a winter that has been best described as “consistently inconsistent”, another winter storm will evolve in the interior, bookended by warmer than normal temperatures. Low pressure moving from the Mississippi Valley into the Eastern Great Lakes is likely to be the initial impetus for precipitation moving into the Northeast US by Tuesday.

Much of this precipitation will be driven by a  process known as “Warm air advection” — in other words, the movement of warm air through multiple levels of the atmosphere. Lift for precipitation will move into the Northeast as the afternoon goes on, and the middle layers of the atmosphere will gradually warm from southwest to northeast. This will be suffice to change most areas over to rain in the Mid Atlantic States.

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John Homenuk

Winter hiatus expected to close out December

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After a two week period featuring a polar vortex intrusion, colder than normal temperatures, and frequent winter weather opportunities (especially in the interior) the pattern this week will be one of transition. The hemispheric pattern is undergoing some fairly significant changes, which are working to take then cold air back to its source region by late this week, over the arctic and north pole.

Yes, the arc is swinging back the other way, as the same cold air which was disrupted and pushed southward into the Northern 1/3 of the United States is retreating fairly dramatically. In the stratosphere, the polar vortex is tightening and strengthening over the North Pole, a dramatic difference from the vortex we observed earlier in the season which was stretched, nearly split, and elongated.

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John Homenuk

Arctic air, storminess, and pattern longevity

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Synopsis: Arctic air drops into the Northeast US late this week, with temperatures 20 to 30 degrees below normal. A storm pattern continues with another winter storm expected this weekend. The longevity of this cold comes into question as Christmas week approaches with the return of a Southeast Ridge.

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Lets face it — there has been a ton of conversation in regards to this colder pattern over the past few weeks. Our team of forecasters has been talking about it for more than a few weeks now –and it is finally arriving this week. A piece of the polar vortex (yes, the one you hear about a lot) will drop southward into Canada and eventually through parts of the Northeast states late this week. This will lead to temperatures dropping well below normal over a large part of the region.

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