Heavy rain and high winds are possible through early afternoon Thursday as a slow-moving weather system brings cooler air into Middle Tennessee. While the storms have weakened overnight and early this morning, the National Weather Service warns they could regenerate as the system makes its way past the Tennessee River and into western Middle Tennessee. The same system spawns heavy storms and tornadoes in Arkansas and Missouri Wednesday night. The weather service says the most serious threat includes high, straight-line winds and possible hail. The system is expected to move into eastern portions of the midstate early Thursday afternoon. Rain could be heavy at times and produce localized flooding. April is the peak month for severe weather in Tennessee and so far this year the service has confirmed 27 tornadoes have touched down in Tennessee, but no fatalities have been reported. For the same period last year there were 27 tornadoes with three fatalities.