INDIANAPOLIS — Hurricane Isaias was nearing landfall near the South Carolina coast Monday night as a Category 1 hurricane.
Over the next 12 hours, it will interact with the jet stream that's "digging" southeast in response to an upper air trough over the Great Lakes and Ohio Valley.
This trough not only deflects Isaias away from central Indiana, but the interaction with the jet energy likely creates a stronger and wider wind field as it becomes a hybrid storm over the northeast.
It's possible, if not likely, that there will be more significant power outages and wind damage when it transitions to the expected wind maker during the day Tuesday into Wednesday.
The impact from the trough locally will be a streak of unseasonably cool mornings and afternoons. Lows Monday night near 60° while "highs" struggle into the mid-70s Tuesday due to a northerly wind and cloud cover.
Wednesday morning will be even cooler with 40s and low 50s likely followed by sunshine and lower 70s, a taste of early autumn in early August.