The eastern U.S. will have chilly but dry weather for most of Wednesday before Thanksgiving. It includes New York City, Boston, Chicago, and Atlanta. Expect a cold front to clash with warm, moist air from the Gulf of Mexico that will spark rain and thunderstorms over part of the southern Plains and Mississippi Valley. Flight delays and cancellations due to the weather could have an accordion effect across the country, potentially disrupting flights to or from cities where conditions are dry and calm.