Thursday is shaping up to be a day when the weather demands attention. The WGAL News 8 Storm Team has designated it an ALERT Day, meaning there’s a real threat for extreme, severe, and possibly life-threatening conditions. Scattered thunderstorms could bring damaging wind gusts, heavy rain, and isolated flash flooding across the Susquehanna Valley.
Showers are expected to develop late in the early morning hours and linger through late morning. The humidity will make a comeback, with temperatures holding in the 70s. Then, as a line of storms builds to the west and moves into the valley, the afternoon could bring downpours and thunder.
Flood watches are already in place. The National Weather Service has issued one for Adams, Cumberland, Franklin, Juniata, Mifflin, and Perry counties until 4 p.m. Thursday. Another watch covers all of south-central Pennsylvania until 8 p.m. The concern is localized heavy rain that could cause flash flooding, particularly in low-lying areas with poor drainage.
For severe weather, the Storm Prediction Center has highlighted areas along and east of Interstate 81 under a marginal risk. A slight risk, level 2 of 5, applies to parts of York and Lancaster counties, specifically along and south of Route 30. The towns of Elizabethtown, Lititz, Manheim Boro, and Ephrata sit in this zone.
The timing is key. The strongest storms are most likely between 1 p.m. and 5 p.m., with gusty winds as the primary hazard. A Severe Thunderstorm Watch has been posted for four Susquehanna Valley counties until 10 p.m., though the threat will taper off after the evening hours.
The entire Susquehanna Valley remains under a marginal risk for isolated flash flooding. That’s a level 1 out of 4. It doesn’t take much for roads to flood when drainage is poor.
Looking ahead, Friday will offer a break. Expect dry weather and sunshine, with highs near 80 degrees. The humidity will drop, making it feel noticeably fresher. The weekend, however, turns unsettled again. Low pressure develops over the Mid-Atlantic on Saturday before pushing offshore, and a cold front sweeps through Sunday. Showers and thunderstorms are possible both days, with temperatures hovering around 80.
Next week brings a change. A cooler and more comfortable air mass settles in, with high temperatures in the upper 70s to near 80. That’s several degrees below average for this time of year, when highs typically reach the mid 80s.
The WGAL News 8 Storm Team will continue to monitor the forecast and provide updates as needed.
