D.C. weather forecast: Cold weather expected this week

For the first time in months, I had to turn on the seat heaters in my car for the drive in. The coldest air of the season arrived Monday along with Frost Advisories west of D.C. It's the coldest morning we've had in five months. Here's a look at the chilly morning lows.

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Monday Morning Lows

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No records were broken; in fact, there was little frost to report, but it was a glimpse at what we can expect later this week.

While it might seem like a bit of a shock to the system, the cool air arrived right on time. Check out the average first frost dates for the area.

Average First Frost Dates
On a bright note, we will have a wide range of temperatures Monday and end up in the upper 60s with plenty of sunshine. We need these chilly nights and warm days to help our leaves turn more brilliant colors. Much cooler arctic air that is in the upper Midwest will make an arrival by midweek. Frost will be even more likely than today with the coldest mornings on Thursday and Friday. Check out the forecast lows by the GFS model for Friday morning.{ }

GFS Forecast Low Temperatures Friday (WeatherBell)
There is an unofficial rule in meteorology, especially this time of the year, that the second day of high pressure is the coldest. That will be true this time around. Clear skies Thursday night/Friday morning will help aid this. In addition to frost, there may even be a little snow in the mountains. Best chance of that will be on Wednesday night and Thursday. Here is a look at the potential for snow to our West.

GFS Snowfall Forecast Wednesday and Thursday (WeatherBell)

In addition to this blast of colder weather this week, I am seeing signs of another big chill for late next week just in time to wear layers under your Halloween costume.{ } As always that far out, it is subject to change. The Stormwatch7 team will keep you up to date online and on air.