Severe weather, including the slight possibility of a tornado, is expected on Saturday afternoon.

The National Weather Service on Saturday morning said thunderstorms would develop between noon and 2 p.m. “then become more numerous during the mid and late afternoon.”

The storms are expected to include strong and damaging winds plus torrential downpours. The storms could also include frequent, vivid lightening.

Those downpours may cause flooding in small streams and poor drainage areas.

The possibility for the severe weather extends across most of southern and central New England, including Andover.

The weather service also said there is a low chance of tornadoes “but it is a chance worth mentioning.”

By midday on Saturday, a tornado watch had been issued for parts of Connecticut and western Massachusetts.

The chance of a severe storm will continue after dark, the weather service said.