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Joshua Feldman

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Heavy snow, rain and thunderstorms are poised to return to the flood-weary Central US late this week as a Rocky Mountain-based storm roars across the Central Plains and Mississippi River Valley. The Missouri and Mississippi Rivers are still above flood stage weeks after heavy rain, rapid snow melt, and impenetrable ice jams prompted the rivers to swell to record extents earlier this month. It will therefore not take much more rain to inundate many communities still recovering from the catastrophic flooding. The storm’s upper air support will actually originate over the Pacific Ocean. But the upper-area of low pressure will quickly run out of juice after dumping heavy rain and delivering yet another heavy snowfall to the Sierra-Nevada Mountains in California on Wednesday. The system will lose the influx of moisture from the subtropical Pacific as it progresses over the Great Basin Thursday. Its surface component will fizzle with a…

Temperatures will soar to record levels through midweek in the Western US as warmth expands with an intensifying ridge of high pressure. It will feel more like June than March in low-lying coastal areas and valleys from San Francisco to Vancouver as the mercury climbs above 70 degrees. The warm temperatures are the result of easterly winds compressing as it flows down mountains. But as winter-weary coastal residents bask worry-free in the spring sun, concern grows across inland communities that the inevitable snow melt will lead to severe flooding. The Western US underwent a brutal winter featuring a parade of powerful storms that contributed to record snowfall for the month of February in Seattle and over 50 feet of seasonal snowfall in the Sierra-Nevada. Snowfall was not quite as extreme in the Cascades but snow was nonetheless overly abundant. The snow pack depth currently ranges from roughly 3 feet in…

The pitter-patter of rain drops on gutters across the Northeast Sunday afternoon signaled the end of winter across the majority of the East Coast. A surge of mild air spreading northeastward will bring temperatures of at least 50°F as far north as New York City Monday. Temperatures are expected to be slightly cooler Tuesday and Wednesday, but they will only be a few degrees cooler than average ahead of a more substantial warmup late week that . This pattern of frequent temperature swings is quintessential of spring and is expected to continue indefinitely. But as promised near the end of February, snow and extreme cold are not expected to be associated with the intermittent temperature downswings.There is abundant support suggesting winter’s demise besides the increasing sun angle. First and foremost, the Arctic Oscillation (AO), the climate mode that describes the intensity of the circulation in the arctic, is in its…