The sunny, dry weather we're enjoying this Monday morning will gradually give way to increasing clouds and scattered showers late today as low pressure drops south out of New York State, forecasters say.
With the darker, damper weather will come the coolest daytime highs since early June. (The June
Forecasters out at Sterling say the high at BWI-Marshall Tuesday will be around 74 degrees - 10 degrees cooler than the long-term average for the date. Overnight lows near 66 degrees are a bit warmer than the average, but cool enough to open the windows and silence the air conditioners.
As the low pressure system drops to our south, we will come into a northeasterly flow off the Atlantic, making Tuesday a cool, gray day. Rainfall probably won't amount to much, but it will feel damp.
Showers should taper off Wednesday as a weak cold front makes its way in to the region. As high pressure builds in behind the front, we'll be looking at clearing skies and temperatures rising back into the mid-80s for the weekend. Next week is likely to begin with sunny, dry weather and temperatures near seasonal norms, if forecasters are correct.
This will also be a week for watching what is likely to become Hurricane Danielle later today. The season's fourth named storm has strengthened to tropical storm force, with top sustained winds of 60 mph. It does not look like it will become a threat to the East Coast. It seems to be tracking too far north, with a turn to the north and northeast likely by the weekend, well before it can approach the coast.
Here is the latest advisory on Danielle. Here is the forecast storm track. And here is the view from space.