A developing low pressure system is expected to bring as much as 11 inches of rain to coastal counties through Friday.

A thunderstorm Thursday night brought almost an inch of rain to Bay County, but much more is in the forecast this week, according to the National Weather Service.

An area of low pressure is forecast to remain “nearly stationary across the northeastern Gulf of Mexico” today and Monday, according to NWS, with a 20 percent chance of becoming a tropical system.

Whether or not the storm develops into a tropical system, it is expected to bring significant rain beginning early this week, with as much as 11 inches forecast for coastal counties in Northwest Florida through Friday as the storm moves slowly westward.

Flash flood warnings are in effect for North Florida, particularly along the coast and near river systems.