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Boston Weather: 44.0°F | Mostly Cloudy

Weather: April Showers, Early

By Greg Lawson
STAFF METEOROLOGIST -- Spring is officially here now, though we’ve sensed her precociousness these past several weeks. Well, the above-average-temperatures cadence will beat-on this week, in spite of the heavy rain we’ll experience today. Today’s storm is the product of a well-formed, well-positioned, very strong upper-level cut-off low interacting with a healthy surface low. Basically, the two lows have their peak amplitudes out of phase by ninety degrees with the upper-level low being west of the surface low. This “westward tilt with height”, as it’s called, will allow a brief period where the two lows will actually mutually amplify each other, each by giving (via transport from its counter-clockwise flow) the other more of what it needs for growth. This mutual interaction is predicted theoretically in our simplest conceptual models of how disturbances grow in the atmosphere, and today we are witnessing a pretty good testament to its existence in nature. As the disturbances grow, their pressure anomalies will deepen and their associated winds will increase. A wind advisory has actually been issued for the local counties. Look for strong winds, heavy rain, and the potential for thunderstorms. The storm should pass out by nightfall leaving us with our accustomed partly cloudy, springy weather.

Today: Rain with strong winds. Slight chance of thunderstorms. Rains ending and winds slowing by nightfall. High of 54°F (12°C).

Tonight: Breezy and cool. Partly to mostly cloudy. Low of 41°F (5°C).

Wednesday: Windy and mild. Scattered clouds. High of 57°F (14°C). Low of 40°F (4°C).

Thursday: Lighter winds. Mild. Partly cloudy. High of 58°F (14°C). Low in the low 40s (4 to 6°C).

Friday and Beyond: More of the same.