8:20 PM EDT, August 25, 2012
Central Indiana had another hot day with temperatures in the low 90s. Indianapolis officially hit 92°F this afternoon. Skies will be mostly clear but this will not result in cool overnight temperatures. Dew points have slowly risen today and this will keep temperatures around 71°F here in the metro and closer to the 66-68° in the outlying areas overnight.
Sunday will be another warm and muggy day across the state. A low pressure system will be approaching the Ohio Valley and this will increase our cloud cover during the day. But the main chance for rain on Sunday won't be stretched across the entire area. The best chance for rain will be in the late afternoon and evening hours in the northwestern part of the state. It won't be until late Sunday night and into Monday that the rest of Central Indiana gets a chance for rainfall. After looking at several weather models, it's safe to say that we'll see between .25" to .75" of rain out of this system and we'll probably see a few isolated reports closer to the 1" mark. Storms should stay below severe criteria, but an isolated severe storm cannot be ruled out.
The forecast will be dry from Tuesday through Friday morning but uncertainty arises due to Tropical Storm Isaac. Some of the weather model pull the storm up into the Ohio Valley and this would result in soaking rains and a gusty winds. But at this point, there is still too much that could change in the near term forecast.
Here's a quick update tonight on Tropical Storm Isaac. It's on the northern shore of Cuba with 60 mph winds and will spend the day on Sunday tracking to the Northwest. It looks rather likely that this storm will impact Southern Florida, especially the Keys. The storm will strengthen when it gets into the gulf late Sunday. It looks like this could easily become a Category 1 hurricane late Sunday and possibly a Category 2 hurricane before making landfall further north in the Gulf coast. The exact location that it will make landfall is a little uncertain at this point, but most of the model runs place the storm somewhere between Louisiana and Florida by Tuesday.