St. Lawrence County is under a hazardous weather outlook as the National Weather Service expects heavy rains Wednesday followed by potentially dangerous heat on Friday.

Meteorologists attribute this to a storm system created by what's left of Tropical Storm Barry.

"Expect widespread showers and isolated thunderstorms on Wednesday as a cold front moves down from Canada and interacts with deep moisture associated with the remnants of tropical system Barry. Rainfall amounts will generally be in the half inch to one inch range with Some locations receiving amounts in the 1 to 2 inch range. These could lead to localized flooding. The heavier precipitation will move out of the area later Wednesday night into early Thursday with a relatively dry day expected," the NWS said in a hazardous weather statement.

They expect this to be followed by a sweltering Friday and potential thunderstorms and more rain on Saturday.

"On Friday we will transition to hot and humid conditions with high temperatures well into the 80s to lower 90s. This combined with dew points around 70 will lead to Heat Index values in the lower to mid 90s. These values indicate extreme caution is advised as the likelihood of heat disorders increases. In addition to the hot and humid conditions on Friday and Saturday the threat for showers and thunderstorms will exist. Some of the storms will have the potential to become strong or severe," NWS said.

The detailed forecast for St. Lawrence County:

Rest of Tuesday - Partly sunny. A chance of showers late this morning, then a slight chance of showers this afternoon. Highs in the mid 80s. Southwest winds 10 to 15 mph. Chance of rain 30 percent.

Tuesday night - Partly cloudy with a slight chance of showers until midnight, then mostly cloudy with showers likely after midnight. Humid with lows in the upper 60s. Southwest winds 10 to 15 mph. Chance of rain 70 percent.

Wednesday - A slight chance of thunderstorms. Showers. Some thunderstorms may produce heavy rainfall. Humid with highs in the upper 70s. Light and variable winds. Chance of rain 80 percent.

Wednesday night - Mostly cloudy with a chance of showers. Lows in the lower 60s. Light and variable winds. Chance of rain 50 percent.

Thursday - Partly sunny. Highs in the mid 80s. Light and variable winds.

Thursday night - Partly cloudy. Lows around 70.

Friday - Mostly cloudy with a chance of showers and thunderstorms. Highs in the upper 80s. Chance of rain 50 percent.

Friday night - Partly cloudy with a chance of showers and thunderstorms. Lows in the lower 70s. Chance of rain 50 percent.

Saturday - Partly sunny with a chance of showers and thunderstorms. Highs in the upper 80s. Chance of rain 40 percent.

Saturday night - Partly cloudy with a chance of showers and thunderstorms. Lows in the upper 60s. Chance of rain 30 percent.

Sunday - Partly sunny with a 30 percent chance of showers. Highs in the mid 80s.

Sunday night - Partly cloudy with a 30 percent chance of showers. Lows in the upper 60s.

Monday - Partly sunny with a chance of showers and thunderstorms. Highs in the lower 80s. Chance of rain 50 percent.