Brian's exclusive forecast for Annapolis: Hazy, hot, and humid today with afternoon thunderstorms and a high around 90. South winds near 10 mph. Showers and thunderstorms during the evening, the mostly cloudy overnight with a low around 65. Morning clouds on Friday giving way to a mostly sunny afternoon with a high near 75. Northwest winds around 10 mph. Clear and cool Friday night with a low from the upper 40s inland to the mid 50s near the bay shore. Sunny and pleasant on Saturday with a high in the upper 60s to lower 70s. Looking ahead to Sunday, we can expect a mostly sunny sky with lows around 50 and highs around 75.
The main weather feature today will be the continuation of hot and humid weather as temperatures are once again expected to eclipse 90 degrees at most locations. Cloudiness moving in from the west may hold temperatures in the upper 80s, but humidity will be uncomfortable and will make it feel just as hot as yesterday. Meanwhile, a strong cold front will approach the Chesapeake from the west this afternoon. Warm, humid air rushing northward ahead of the front will clash with the front and result in widespread showers and thunderstorms from late this afternoon through the evening hours. Some storms may be severe with heavy rains, strong winds, and dangerous lightning. The front will clear the area by Friday morning. Although considerable cloudiness may persist into Friday morning, by the afternoon we can expect bright sunshine and highs only in the mid 70s with a northerly breeze. High pressure will continue to build over the area this weekend with sunshine and pleasant temperatures expected both Saturday and Sunday.
On the Maryland portion of Chesapeake Bay, a Small Craft Advisory is in effect from this evening through Friday afternoon. Winds today will come out of the southwest at 10 mph, except gusty in thunderstorms. Winds tonight will shift to the northwest after midnight at 10 to 15 knots with gusts over 20 knots. Boaters should be prepared for evening showers and thunderstorms. Winds on Friday will come out of the northwest at 10 to 20 knots with some gusts over 25 knots. 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 12 is 79 degrees and the average low is 59. The records at Baltimore on this date are 96 degrees in 1931 and 43 degrees in 1967. 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.