DELMARVA - Sussex County is expected to stay cloudy, cool and increasingly foggy late Thursday evening as a stationary boundary south of the Delmarva Peninsula begins lifting north as a warm front, according to the National Weather Service.
The onshore flow holding cool air over the area is expected to keep temperatures suppressed overnight and into Friday morning, with readings mainly in the 40s and 50s. Low clouds and fog are likely to thicken through the night as moisture increases, and forecasters say patchy dense fog could develop around or just after sunrise Friday.
A few light showers are also possible, though significant rainfall is not expected.
The bigger change will come later Friday. The warm front is forecast to move through during the morning and continue north through the afternoon, but the cooler air near the ground may be slow to break. That means Sussex County will likely remain gray and damp through much of the first half of the day before conditions begin improving.
By late Friday afternoon and into Friday evening, skies should gradually clear as the inversion weakens and warmer air mixes to the surface. Temperatures are then expected to rise quickly, with highs reaching well into the 70s.
The warmer pattern is expected to continue into Saturday before a cold front brings rounds of showers and possible thunderstorms to the region Sunday, followed by more seasonable temperatures next week.