Periods of Rain Expected Across Delmarva Through the Weekend

Residents across the Delmarva Peninsula should prepare for several rounds of rain as a series of weather systems move through the region from late Friday into early Sunday. While no significant flooding or severe weather is expected, the stretch will bring generally wet and mild conditions. The first system arrives late Friday as a weakening […]

Residents across the Delmarva Peninsula should prepare for several rounds of rain as a series of weather systems move through the region from late Friday into early Sunday. While no significant flooding or severe weather is expected, the stretch will bring generally wet and mild conditions.

The first system arrives late Friday as a weakening cold front moves into the Mid-Atlantic. This front is tied to an area of low pressure lifting north from the Great Lakes toward Quebec. Rain is expected to develop Friday afternoon and continue into Friday night. As the front weakens and gradually dissipates over the region, temperatures are not expected to drop noticeably, with little to no cold air pushing in behind it.

A second, more impactful system follows on Saturday. A deepening upper-level trough moving south from Canada into the Great Lakes will help spawn a new surface low over the lower Mississippi River Valley. This low will track northeast, pushing a warm front northward across Delmarva on Saturday. As the warm front lifts through the region, rain coverage will increase and milder air will overspread the peninsula.

Temperatures on Saturday may behave unusually, with some locations seeing their highest readings later in the day or even during the evening hours as warmer air moves in. Overnight temperatures may hold steady or even rise slightly in some areas. Overall, Saturday is expected to be a warm and wet day, with temperatures ranging from the upper 40s to the low 60s.

Heavier rain is expected to move in later Saturday as an initial cold front crosses the region. While a brief rumble of thunder cannot be ruled out due to some elevated instability in the atmosphere, no severe weather is anticipated. Showers may linger Saturday night until a secondary cold front moves through on Sunday morning. Behind that front, winds will increase, but the chance of wind gusts reaching advisory levels remains low.

There is higher confidence that Delmarva will see periods of rain from Friday afternoon through Sunday morning, though exact rainfall totals remain uncertain. Most guidance suggests at least a half inch of rain, with some models indicating localized totals between 1.5 and 2 inches. The probability of receiving one inch or more of rain is around 40 to 60 percent, while the chance of exceeding two inches is low.

Rainfall is expected to fall over a 36 to 48 hour period with breaks between systems, reducing the risk of flooding. With mild temperatures in place leading into the weekend, any remaining ice in streams or rivers should have already melted, allowing water to drain efficiently. Confidence in rainfall totals and timing is expected to improve as the weekend approaches.