From the ABC 7 Weather team

Leave the sunglasses and grab your umbrella

October 11, 2011 - 05:35 AM
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After six straight days of sunny and rain-free weather, you will notice the coming changes.

Changing weather pattern

After six straight days of sunny and rain-free weather, you will notice the shift in our weather pattern. This has been the longest stretch of dry weather since late July and early August when D.C. had eight consecutive rain-free days. The first sign of our changing weather pattern was the added, thin cloud cover/filtered sunshine yesterday, but get ready for more significant changes.

Our sunny high pressure system is moving out of town and is being replaced by an active low pressure system moving up the east coast.  This low is tapping into moisture from all the way down in the Caribbean, and this will translate into moderate rainfall Tuesday night through Wednesday. As this low has abundant moisture to work with, one to two inches of rain is expected by Wednesday evening. The heaviest rain will likely be in the Shenandoah Valley and Potomac Highlands far west of D.C. where they should see nearly two inches of rain. Meanwhile, closer to an inch is anticipated around the metro area. Here's the rainfall forecast from the Hydrometeorological Prediction Center:

 



HPC rainfall forecast

 

The first few drops are expected this afternoon as some stray showers are possible, but they will be widely separated. We are expecting everyone to get rain tonight while we sleep with off & on showers most of the day Wednesday, so expect a soggy morning commute tomorrow with the rain coming to an end around the evening drive home. Another round of showers are anticipated Thursday night with sunshine in store for the weekend. 

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