Tuesday's weather featured a mostly sunny sky with seasonably warm temperatures. Afternoon highs climbed into the mid to upper 80s on the western shore of the bay with a light southerly breeze. At 11 p.m. the mercury has dropped back into the mid to upper 70s. High pressure just off the eastern seaboard will result in a mostly clear overnight, although some fog may develop toward morning at some locations. After some morning fog, sunshine will return on Wednesday with highs once again in the mid to upper 80s. There is a slight chance of an afternoon thunderstorm with a upper-level system moving in from the west, but most areas should remain dry. Looking ahead to Thursday, we can expect hazy sunshine with afternoon clouds overspreading the region from west to east as a cold front approaches the area. Highs on Thursday will be in the upper 80s, with a few spots touching 90, before showers and thunderstorms develop later in the afternoon. Showers and thunder may persist into Thursday night before drier air works its way east of the mountains in the wake of the cold front. Friday will be sunny but with lower humidity with highs in the low to mid 80s.
On the Maryland portion of Chesapeake Bay, there are no advisories currently in effect. Winds overnight will come out of the southwest at 10 knots or less with wave heights of 1 foot or less. A southwest wind of 10 knots or less will continue on Thursday with wave heights of one foot or less. 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 August 21 is 85 degrees and the average low is 65. The records at Baltimore on this date are 97 degrees in 1899 and 51 degrees in 2000. 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.