Step one. Look at your roof. It is not uncommon for plastic roof vents to lose their top cover during high winds. It will be pretty obvious if one is missing. Step 2. Check in attic. Once again roof jacks are very common leak spots, I would examine the range vent and any other vents above where the kitchen is. With any solid pipe going to the roof, you may need to feel the pipe to tell if water is running down the side. Step 3. Seal the problem with roofing tar or replace the roofjacks if needed.