MU's thoughts on the weekend storm and February: (he's thinking his cold and snowy February forecast will be a big fail)
By Saturday afternoon, my attention will turn toward a developing storm system over the Deep South. The track, speed, and intensity of the storm system are presently highly uncertain, but odds favor it exiting the East Coast somewhere around the Delmarva Peninsula or New Jersey Sunday night. Skies will turn cloudy again Saturday evening, and more wet weather is a "good bet" later Saturday night through Sunday night. Temperatures will initially be way too high for any snow or sleet concerns, but a cold air mass draining southward out of New England could cause rain to change over to snow Sunday night. If this transition happens fast enough, then several inches of wet snow could fall across parts of the region. However, rain could just as easily end before any transition to wet snow. In this type of pattern, predictability has and will continue to be limited to a time span of 3-4 days. Thus, I'll post an update on and have a full analysis of Sunday's system at the end of the week. In the meantime..
The Madden-Julian Oscillation (MJO).. or an eastward-moving wave of convection between the Indian and western Pacific Oceans.. is currently in phase 6 and moved through phases 4 and 5 over the last 10 days. It will likely reach phase 7 by the weekend and may possibly stall there through the first 7-10 days of February. During El Niño, MJO activity in phases 4-7 often leads to a persistently mild and snowless pattern in the I-81 and I-95 corridors of the mid-Atlantic States in January and February (see below). There is usually a 1-week lag effect with MJO forcing across eastern North America, so effects of the recent MJO activity just began over the last 48 hours.
In addition, the Stratospheric Polar Vortex (SPV), or band of westerly winds enclosing a large pool of extremely cold air that develops 10-30 miles above the ground over the North Pole every winter, has become very strong and stable following its weakened state during the past 3-4 weeks. Instead of being stretched out and split into two pieces, it is now in the shape of a doughnut over the Arctic Circle and expected to remain near the North Pole or drift toward the Eurasian side of the globe by early February. A strong SPV is often associated with weaker storms and a less-amplified Jet Stream. To make a long story short, the odds are stacked against a significant snowfall or any more intrusions of Arctic air through at least the middle of February. As a warm-weather lover, I certainly won't complain, but this is admittedly a big change from my expectations for February in my Winter Outlook. I could choose to "go down with the ship," but there's no point in doing so when the writing is on the wall. In the words of the famous Kenny Rodgers, "Know when to fold em'.." -- Elliott