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Boston Weather: 20.0°F | Fair

Weather: Spring Waves Hello... Goodbye... Hello ...

By Greg Lawson and Rob Korty

The stark contrast of warmth and cold so typical of early spring weather patterns continues this year unabated. Perhaps now more than ever we can appreciate the wave-like nature of our mid-latitude weather. As deep troughs intensify out west and propagate towards us, sharp fronts pass by sometimes producing temperature drops of over 40°F (22°C) and radical shifts in weather. This past weekend’s weather exemplifies this. Now that the nasty low which brought us snow has passed, the patterns have relaxed back to a more zonal state (from west to east) waiting for the next big trough to hit. However, it appears as though the next one, set to arrive sometime this evening, will pale in comparison to its downstream predecessors. But it will still be enough to bring us precipitation -- a high pressure system slowly heading towards Bermuda has been feeding Gulf moisture into a growing frontal region in the southern Mississippi River Valley. This front will be tilted and elongated by the jet stream so as to reach New England and deliver its rain. This small trough will pass Wednesday mid-morning, but the clouds and cool temperatures will linger until Thursday morning. Thursday promises to be the nicest day this week, though it will still fall short of normal temperatures. Another trough bearing rain could affect next weekend.

Today: Cool and overcast. Winds shifting from westerly to easterly.

Rain beginning in the evening. High of 43°F (6°C).

Tonight: Miserable. Rainy and cold. Low of 35°F (2°C).

Wednesday: Rain tapering. Grey and chilly day with increasing winds.

High of 47°F (8°C). Low in the mid 30’s (1 to 3°C).

Thursday: Partly cloudy. Breezy. High in low 50’s (10 to 12°C). Low

near 40°F (4 to 5°C).

Friday and Beyond: Getting warmer but chance of showers.