The National Weather Service says an upper-level storm system is expected to push a cold front across North and Central Texas during the first half of next week. The system is forecast to hit the Rockies and Great Plains on Monday before moving through Kansas and Oklahoma and into Texas.

Forecasters said the system could be the strongest of the fall so far. Thunderstorms are possible in the afternoon or evening on Monday or Tuesday, depending on how fast the system moves. As of Wednesday afternoon, the highest chance of precipitation on Election Day was 9% at 4 p.m.

Temperatures on Election Day are expected to reach 75 degrees, with overnight lows in the 50s, according to the weather service. The agency said the severe weather threat is uncertain and that details will become clearer in the coming days.