Miami Valley , Whitewater Valley, and the I-71 corridor of Ohio/Indiana:
A strong cold front will settle across the region today through Monday evening. An area of strong storms should form by 5pm this afternoon lasting through 10pm. Strength of these storms will depend on heating through a thick haze that should gradually thin out this afternoon. This haze is a result of dying thunderstorms from the North overnight. None the less temps should get into the lower to middle 80s this combined with sufficient humidity, dew-points in the lower 70s will make for CAPE values in the 1000 to 2000 j/kg. Shear in the 30 to 40 knot level will make for the primary threat to be damaging winds and some large hail, especially since winds will run parallel to the front, meaning less turning with height. However an isolated tornado cannot be ruled out in any supercells that develop ahead of this evenings squall line. Flash flooding will likely occur where storms move slower and train. A second stronger front will move in tomorrow afternoon and evening giving us another chance of scattered showers and storms. These storms will be a bit weaker and more isolated in nature due to less humidity in the air.
Behind the front a rare mid July cold shot will drop in from Canada. Record low highs could be challenged as well as record lows for many. Highs will stay near 70 Wednesday with overnight lows dipping into the upper 40s for some.
The following is the seven day forecast for the Dayton metro area and a 50 mile radius around it. Other metro areas like Columbus, Cincinnati, and Portsmouth are not included. For those areas please request a separate
Today 7/13 - Mostly cloudy, a slight chance of scattered showers and thunderstorms early and then a chance of scattered severe thunderstorms again after 5pm. Winds SW 5 to 15 mph. High 83. Chance of rain 50%. Rainfall around a tenth to a quarter of an inch, higher amounts possible in and around thunderstorms.
Tonight 7/13 - Mostly cloudy, scattered showers and thunderstorms early. Some storms may be severe. Winds W 5 to 15 mph. Low 67. Chance of rain 80%. Rainfall around a quarter to a half of an inch, higher amounts possible in and around thunderstorms.
Monday 7/14 - Mostly cloudy, scattered showers and thunderstorms by pm. Winds WSW 5 to 15 mph. High 83. Chance of rain 50%. Rainfall around a tenth to a quarter of an inch, higher amounts possible in and around thunderstorms.
Mon night 7/14 - Mostly cloudy with a chance of scattered showers and thunderstorms early then becoming partly cloudy. Winds NW 5 to 15 mph. Low 58. Chance of rain 40%. Rainfall around a tenth of an inch, higher amounts possible in and around thunderstorms.
Tuesday 7/15 - Partly sunny. Winds NW 5 to 10 mph. High 73.
Tues night 7/15 - Mostly clear. Low 50.
Wednesday 7/16 - Partly sunny. High 72.
Wed night 7/16 - Mostly clear. Low 53.
Thursday 7/17 - Mostly sunny. High 78.
Thur night 7/17 - Mostly clear. Low 55.
Friday 7/18 - Mostly sunny. High 80.
Fri night 7/18 - Mostly clear. Low 60.
Saturday 7/19 - Partly cloudy, a slight chance of scattered showers and thunderstorms. High 83. Chance of rain 20%.
Sat night 7/19 - Partly cloudy. Low 64.