Hurricane Isaias could send 1 to 2 inches of rain into Lower Merion as early as Sunday night, Oct. 11.

The storm's arrival would add to a punishing year. Township Manager Ernie McNeely said at a September budget workshop that Lower Merion has spent $1.2 million on storm response in 2026.

The National Hurricane Center (NHC) confirmed Thursday, Oct. 8, that Isaias had strengthened into a hurricane with 75 mph sustained winds over the Gulf of Mexico. The NHC projected the storm would peak as a Category 2 hurricane with 110 mph winds Friday night before making Gulf Coast landfall.

After landfall, the storm's remnants are forecast to track northeast through Ohio and western Pennsylvania. The National Weather Service said computer models show "strong agreement" that those remnants will reach the greater Philadelphia region, as the Philadelphia Inquirer reported.

"There could be some heavy rainfall," NWS meteorologist Mike Lee said Wednesday, Oct. 7. "We'll have to keep a close eye on it to see how things evolve the next couple of days."

The Weather Prediction Center placed the Philadelphia region under a "marginal" risk for heavy rains. NWS meteorologist Paul Fitzsimmons told the Delaware News Journal the agency expected rain from Sunday, Oct. 11, through Monday, Oct. 12, but no threat of high winds or tornadoes in the mid-Atlantic.

Exact timing remains uncertain. New NHC maps showed a slower approach toward the region, and the storm's strength when it reaches southeastern Pennsylvania is unclear.

Why Lower Merion is watching closely

AccuWeather warned that the biggest impact would come from heavy rainfall, particularly where the ground remains saturated from recent rain, according to Patch.

Lower Merion has absorbed repeated hits in 2026. On July 11, four microbursts brought 60-to-70 mph winds that knocked out power to nearly 7,500 customers and blocked at least 55 streets, prompting a state of emergency.

On Aug. 4, flooding shut down a stretch of I-76 East near the Green Lane Bridge at the Lower Merion-Philadelphia border.

Lower Merion Commissioner Ray Courtney, who chairs the township's sustainability committee, said in an Inquirer article on aging stormwater infrastructure in August: "We get a 100-year storm every year."

The township's 2018 Comprehensive Stormwater Management Plan cited aging pipes, undersized infrastructure and increasing flooding as ongoing challenges.

How to prepare

Lower Merion sends storm alerts through its Blackboard Connect notification system. Residents can also monitor lowermerion.org and the township's accounts on X (@LowerMerionTwp) and Facebook.

To report a PECO power outage, call 1-800-841-4141 or text OUT to 697326.

Forecasters said the storm's local impact should become clearer by Saturday, Oct. 10, as Isaias approaches the Gulf Coast.