Widespread water late tonight and tomorrow morning! Via @NWSIndianapolis… A low pressure system will bring another round of beneficial rain to central Indiana tonight and continuing into Sunday. Rainfall amounts should generally range from half an inch to an inch over most locations with slightly lower amounts across the far north.
Today, upper ridging along with surface high pressure will gradually slide east of the area. Dry air in the lower levels will linger with some influence from high pressure remaining. Moisture aloft will increase with southwesterly flow on the back side of the retreating upper ridge and ahead of a deepening upper low. Clouds will thicken and lower during the day. Some weak lift in the mid levels will try to bring some rain to mainly western portions of the area this afternoon, but the dry low levels should prevent this from reaching the ground. There should be enough sunshine to help temperatures reach the lower 60s across much of the area this afternoon.
Tonight, as the upper low moves into the Upper Mississippi Valley, a 40-50kt 850mb jet will move into the area. Moisture will flow northward from the Gulf of Mexico, with the potential for some limited moisture from Tropical Cyclone Rafael to be brought north as well. Precipitable water values will be approaching climatological maximum for this time of year. At the surface, a warm front will move north into the area tonight. Central Indiana will also be influenced by an upper jet streak. These will produce additional forcing. This all means rain is likely.
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