As a low pressure trough, or “weak, poor excuse for a cool front” moves out into the Atlantic early Thursday, we’re expecting some sunshine in Maryland, as well as a hot and moderately humid afternoon. Temperatures should wind up in the lower 90s in most places, but with no real apparent trigger to cause any showers or thunderstorms to flare up in the afternoon, we’re keeping the forecast dry.
Highs Friday and Saturday will be in the lower and middle 90s, and as a slow-moving front begins to approach the area from the west this weekend, the chances for seeing a couple of showers and a thunderstorm or two will begin to increase. Those areas which have the best chance of getting a stray shower or thunderstorm later Friday will be in the higher elevations of western Maryland, since the daytime heating over elevated terrain will be the breeding ground for a few showers and thunderstorms that really won’t be able to move all that much. Winds both at the surface and aloft associated with a ridge of high pressure will be quite weak.
Saturday and especially on Sunday, with a very moist air mass in place and a front starting to “make its move,” the chances for getting some rain will be increasing. It should be a real “steam bath,” but some of those showers and thunderstorms on Sunday may provide us with some heavy rainfall and temporary relief.