Poor road conditions caused by rain, snow and ice were blamed for numerous crashes, including one that was fatal, in York County on Sunday.

Karen Lee Jackson, 52, of the 1700 block of Alpine Road in Warrington Township was pronounced dead at the scene of a two-vehicle crash on Carlisle Road in Dover Township about 4:50 p.m., said Coroner Pam Gay.

Northern York County Regional Police believe the crash was caused when a 16-year-old driver of the 1997 Jeep Cherokee that Jackson was a passenger in lost control on the icy road.

Rain, ice and snow caused slush to accumulate on roads around York County, said senior meteorologist Carl Erickson with AccuWeather.

As of Sunday evening, just over 3 inches of precipitation had been recorded at the York Airport in Thomasville since the storm began, he said.

The crash: The fatal crash happened when the 16-year-old boy lost control of the SUV on the icy road, went into the northbound lane and crashed into a 2001 Dodge Durango at Blackberry Road, police said.

Both the teen and Jackson were trapped in the Jeep before being freed by firefighters, police said.

The 44-year-old Dover Township man who was driving the Dodge suffered minor injuries, and the teen suffered life-threatening injuries. Both drivers, whose names were not released, were taken to York Hospital, police said.

Jackson died of multiple blunt force trauma, and no autopsy will be performed, Gay said.

Carlisle Road was closed until about 7:15 p.m. as police investigated the crash.

Strange weather: The ice and snow that accompanied heavy rain through the day Sunday caught some people off guard.

Mike Martin, York County maintenance manager for the state Department of Transportation, said when he left work on Friday, he didn't expect to be back in Sunday dealing with snow.

To compound the problem, five to six roads in York County were closed because of flooding.

"We have roads closed for flooding and trucks out plowing," Martin said.

But the crews were ready for the snow.

PennDOT crews in the county keep plows and anti-skid material spreaders on the trucks through about the middle of April in case of late snowstorms.

York County may not be out winter's grasp just yet. Erickson said there's always a small chance snow could accompany rain in April.

But being ready for winter weather doesn't make it any easier to deal with, especially when it's spring and the long winter has taken its toll, Martin said.

"We've been tired of it (snow) since January," he said.

Lot of precipitation: The unusual occurrence of rain, ice and snow was caused by a slow-moving storm that first brought rain and then combined with cold, near-freezing air to cause ice and snow, Erickson said.

York County saw on average 2 to 3 inches of precipitation, with higher elevations receiving more snow than lower areas, Erickson said.

The oddity that is the weather at times will continue into Monday, with snow predicted in the morning and warmer temperatures with a high of near 57 by the afternoon, according to the National Weather Service.

Slush: Though flooding closed some roads in the county, it was the slush and ice that caused most of the problems.

Crashes were reported throughout the day, and, as night fell, tractor-trailers and cars became stuck on some hilly roads in the county.

One crash involved a Canadochly Valley Ambulance Club ambulance that was responding to another crash on Route 30.

The ambulance was driving north on Cool Creek Road in Lower Windsor Township when, about 6:10 p.m., the driver of a southbound vehicle lost control on the ice near Mount Pisgah Road, crossed into the wrong lane and hit the side of the ambulance, said Ed Peashey, president and chief of the ambulance club.

The ambulance is out of service indefinitely until repairs can be made, he said, adding the extent of the damage is not known. The club has a second ambulance in service.

Two EMTs who were in the ambulance were taken to Memorial Hospital as a precaution. The occupants of the other vehicle were not injured, he said.

No one was injured in the crash that the ambulance was responding to.

- Reach Greg Gross at ggross@yorkdispatch.com.