A late-season cold snap will bring the risk of frost for parts of the DMV, prompting a FROST ALRT starting Wednesday evening.

such as grass and windshields, and turn into frost. Note, in this scenario, the water vapor will go directly from gas to ice instead of dew which is liquid to ice. That means frost is not frozen dew.

Depositional frost, also known as white frost or hoar frost, occurs when the dew point is below freezing and water vapor goes straight to a solid. It covers plants and vehicles with ice crystal ...