Chesapeake residents are waking up to hazy sunshine and some areas of fog. The clouds and fog will dissipate as we move through the morning hours. High pressure to our east is bringing a moist, southerly flow of air over the region while an upper-level system moves in from the west. This situation will result in a warm, humid August afternoon with hazy sunshine and the threat of scattered afternoon thundershowers. We can expect high temperatures today to range from 85 to 90 degrees. Some showers may persist into the evening hours, but not everyone will see rain. Overnight we will have humid conditions with scattered showers. On Thursday, a cold front will approach the bay from the west. When this front clashes with the warm, humid air in place over the bay, thunderstorms will develop during the afternoon and evening hours. Highs on Thursday will again reach 85 to 90 degrees. The outlook for Friday and Saturday calls for ample sunshine and lower humidity with daytime highs in the lower 80s and overnight lows in the lower 60s.
On the Maryland portion of Chesapeake Bay, there are no advisories currently in effect. A southwest wind of 10 knots or less will continue on Thursday with wave heights of one foot or less. Boaters should be aware of afternoon showers or thunderstorms that may result in fast-changing weather conditions and some gusty winds. 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.