11:30 a.m. update: A flood watch has been issued for York County and extends from 6 p.m. Tuesday through Thursday morning.
The weather service expects 3 to 5 inches of rain from Monday night to Wednesday night, and says that will likely lead to flood, even spread out over a three-day period.
The Susquehanna River is not expected to flood, but local minor flooding is almost certain, the weather service says.
Earlier story: Sunday lived up to its name, but local residents may need their rain boots the rest of the week.
A system of heavy rain and potential thunderstorms is expected to reach York County late Monday and not let up until Thursday morning.
The National Weather Service is predicting 2 or more inches of rain will fall through the three-day period and send temperatures below normal.
"You'll get significant rain. The exact track of the storm will determine how much," said Kevin Fitzgerald, meteorologist with the National Weather Service.
If the area gets 3 inches or less of rain, it won't be enough to trigger a flood watch.
NWS issues a flood watch when meteorologists are 50 percent confident in the potential for flooding, Fitzgerald said.
"We've not reached that point yet," he said.
York County residents won't have to dodge continuous raindrops — there will be breaks — but it will remain cloudy and damp the whole time, Fitzgerald said.
Above average: The latest wave of rain will fall on already soggy ground.
York has received above-average precipitation this year. From Jan. 1 through April 27, the area had 14.47 inches of precipitation, and the average is 12.3 inches, Fitzgerald said.
While the region is getting above-average precipitation, temperatures are sinking below normal.
During the last week of April and first week of May, York's average temperature is in the high 60s, Fitzgerald said.
Monday will be a few degrees cooler than normal, but Tuesday temperatures will drop 10 to 15 degrees below normal to the low to mid-50s, according to the NWS.
Wednesday will be in the low 60s, Thursday will be normal at about 70, and Friday temperatures will dip to the mid-60s, the NWS said.
"It's going to be a cooler, rainy week, and the rain could be quite heavy at times," Fitzgerald said.
—Reach Candy Woodall at email@example.com.