Mdwx: Autumn officially begins Sunday at 4:44 p.m. and the weather outside is a transitional reflection of the fall season. A Canadian high pressure is continuing to build into the area behind the front that brought us nearly 1″ of rain at BWI. As the high moves in, because of our precip from Saturday, fog will be a concern in some of the valleys going forward this week. Fog Sunday night will be confined mainly from western Maryland into the southern tier of New York. It will be too breezy east of these locations for fog to develop.
We are moving into a moisture-starved pattern and the rain we saw Saturday might be the last that we see for the rest of the month. Looking ahead to the start of the work week, the center of the high will shift to the southeast and will be centered in eastern Ontario. Heights are expected to rise beginning on Monday and this should promote a noticeable warming trend over the first half of the week. Monday is expected to be the coolest day of the week with temps 3-6 degrees below normal for this time of year. Monday night is forecast to be the chilliest night with lows 5-10 degrees below normal.