Posts

Miguel Pierre

1/27/17 AM All Zones: More Seasonably Cold Weather Returns

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A mixture of clouds and sunshine is expected to dominate the weather today, as some instability and moisture will be around to keep some cloud cover over the region. But it will be mainly dry, with westerly downsloping winds. Temperatures will likely hold steady or slowly rise into the lower to middle 40s for most of the region, as another cold front moves through this afternoon. Winds could be gusty again behind this front, but they shouldn’t be quite as high as yesterday.

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John Homenuk

PM All Zones Update: Interior winter storm Tuesday night

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A low pressure area is expected to shift from the Mississippi Valley into the Eastern Great Lakes on Tuesday, bringing enhanced lift and aiding in the development of precipitation over much of the Ohio Valley and Northeast. Much of this precipitation will be driven by a process known as Warm Air Advection. In other words, warming air surging through multiple levels of the atmosphere will be the impetus for precipitation.

It will also serve to ensure that most areas in the Mid Atlantic and near the coast warm up sufficiently for precipitation to fall as rain. Inland, however, a different story will evolve. Cold air from a high pressure to the northeast will settle near the surface, allowing temperatures to fall into the upper 20’s and lower 30’s. A gradual warmup is expected to occur from southwest to northeast, but not before some light wintry precipitation even in parts of Pennsylvania and Northwest NJ.

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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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