The areas under threat are Yalding, Allington and parts of Maidstone with Smarden and Headcorn are on alert too. Other areas include the upper River Medway from Forest Row to Penshurst, including Ashurst.
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The grass pollen risk will rise to high during warm, dry weather.
Cloudy with patchy rain and drizzle this evening. Mild tonight, then dry with plenty of sunny spells tomorrow.
Last night's torrential downpours caused flash flooding in Kent. 17 properties were affected in Ightham as well as ice floes in Kemsing.