Brian's exclusive forecast for Annapolis: Variable cloudiness overnight and not as cool with a low in the lower 60s. Light winds becoming near calm. Considerable cloudiness on Monday with varying amounts of sunshine and a slight chance of a rain shower. The high will be around 80. Breezy and cooler Monday night with cloudiness giving way to a clear sky by morning. The low will be in the upper 50s. The outlook for Tuesday calls for sunshine and pleasant temperatures with highs in the lower 70s.
The day began with cool temperatures as high pressure and light winds combined to make for ideal conditions for radiational cooling. Consequently, the mercury dipped into the upper 40s in places such as Baltimore (BWI) and Salisbury on the Eastern Shore. As the wind shifted to the south, temperatures rebounded under a mostly sunny sky. By mid-afternoon, temperatures climbed into the mid to upper 70s. Other than a few fair-weather clouds, the sky remained mostly sunny. As we move through the overnight hours, a southerly wind will keep temperatures mild compared to last night. Instead of upper 40s and lower 50s, Monday morning lows will only drop into the lower 60s with a few spots in the upper 50s away from the still-warm waters of the Chesapeake. On Monday, a cold front will approach the region from the west. This will produce cloudiness from time to time along with isolated rain showers. In the wake of the cold front, cooler and drier air will return to the Middle Atlantic region on Tuesday with highs only in the lower 70s.
On the Maryland portion of Chesapeake Bay, a Small Craft Advisory is in effect for late Monday night. Tonight, winds will come out of the south at 10 knots or less with waves less than one foot. Winds will shift to the north on Monday at 10 knots with waves around one foot. On Monday night, winds will continue out of the north but will increase to 10 to 15 knots with gusts over 20 knots and waves of 1 to 2 feet. Marine weather information is provided only as a guide. Boaters should always stay tuned to the latest forecasts and advisories from the National Weather Service.
The average high temperature for September 15 is 78 degrees and the average low is 58. The records at Baltimore on this date are 97 degrees in 1927 and 40 degrees in 1873. Weather data courtesy of the National Weather Service. For more weather updates, please visit my Chesapeake Bay Weather page on Facebook, and if you're heading to Ocean City feel free to check out my Ocean City MD Weather page on Facebook. You can also follow me on Twitter @chesbayweather.