CTP seems to be very confident in the shower & storm chances for the Harrisburg area tomorrow.
Saturday
A chance of showers before 11am, then a chance of showers and thunderstorms between 11am and 2pm, then showers and possibly a thunderstorm after 2pm. Some of the storms could produce heavy rainfall. High near 90. Calm wind becoming south 5 to 7 mph in the afternoon. Chance of precipitation is 80%. New rainfall amounts between a half and three quarters of an inch possible.
Saturday Night
Showers and thunderstorms before 11pm, then showers likely and possibly a thunderstorm between 11pm and 2am, then a chance of showers and thunderstorms after 2am. Some of the storms could produce heavy rainfall. Low around 70. Southwest wind 3 to 6 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.