385 FXUS61 KILN 290009 AFDILN Area Forecast Discussion National Weather Service Wilmington OH 809 PM EDT Sun Jun 28 2026 .WHAT HAS CHANGED... Heat advisory has been issued. && .KEY MESSAGES... 1) Hot and humid conditions this week. && .DISCUSSION... KEY MESSAGE 1) Expansive mid level ridge will predominate through much of the week. This is leading to high confidence in hot and humid conditions prevailing across the area. Thus have gone ahead and issued a heat advisory through Thursday. This starts tomorrow, except for the Scioto Valley into northeast Kentucky where it starts Tuesday. The advisory may well have to go into Friday or even Saturday, but some uncertainty enters the picture as the ridge gets suppressed a bit south by then which introduces the potential for something beyond isolated convection. Have seen many times where extended periods of forecast hot weather get interrupted by an MCS that does not get depicted in guidance until late in the game. In addition, there is potential for parts of the area to exceed the heat index threshold of 105 that would necessitate a warning at some point during this heat wave. The problem is that small errors in forecast temperature and dew point can translate into larger errors in the heat index forecast. So have taken a more cautious approach by going with an advisory for an extended period of time. If/when confidence in heat indices exceeding that threshold, beyond isolated locations, increases then the advisory can be upgraded to a warning. && .AVIATION /00Z MONDAY THROUGH FRIDAY/... A few showers and thunderstorms developed in the moderately unstable airmass near a stalled boundary across Central Ohio. This convection is dissipating with decreasing clouds. With light winds and abundant low level moisture, expect fog to develop overnight. Clouds with VFR ceilings will slowly shift eastward into the region after 06Z. These clouds should limit further drops in visibility. Clouds are expected to be more prevalent across the west so KCMH/KLCK, so IFR visibilities are forecast there. Visibility will improve quickly after 12Z with a scattered cumulus clouds developing along with some high clouds. Winds will remain light overnight, eventually becoming southerly on Monday. OUTLOOK...No significant weather expected. && .ILN WATCHES/WARNINGS/ADVISORIES... OH...Heat Advisory from noon Monday to 8 PM EDT Thursday for OHZ026-034- 035-042>044-051>053-060>062-070>072-077>081. Heat Advisory from noon Tuesday to 8 PM EDT Thursday for OHZ045-046- 054>056-063>065-073-074-082-088. KY...Heat Advisory from noon Monday to 8 PM EDT Thursday for KYZ089>099. Heat Advisory from noon Tuesday to 8 PM EDT Thursday for KYZ100. IN...Heat Advisory from noon Monday to 8 PM EDT Thursday for INZ050-058- 059-066-073>075-080. && $$ DISCUSSION...35 AVIATION...AR