Travel Related Maps

Toggle National and Regional Views
Click the blue-button above to toggle between National and Regional views. View persists until toggle back.
For adding explicit book-marks to directly access preferred weather maps, visit our FAQ page.

Learn about SNOWcast
The snow forecast map shows the forecast snowfall in inches for the next 48 hours. Snow is a type of precipitation in the form of crystalline water ice, consisting of a multitude of snowflakes that fall from clouds. Since snow is composed of small ice particles, it is a granular material. It has an open and therefore soft structure, unless packed by external pressure. The METAR code for snow is SN.
Snow forms when water vapor condenses directly into ice crystals, usually in a cloud. Floating cloud particles (ice nucleators, often of biological origin) are needed in order for snowflakes to form at temperatures above -40C. 85% of these nuclei are airborne bacteria, with dust particles making up the rest. The ice crystals which form around the ice nucleators typically have a diameter of several millimeters and usually have six lines of symmetry. A snowflake is an aggregate of such ice crystals and may be several centimeters large. The term "snowflake" is also used below for the symmetrical ice crystals themselves. The individual ice crystals are clear but because of the amount of light the individual crystals reflect snowflakes appear white in color unless contaminated by impurities.
More in the Travel Center

View the latest sailing conditions, marine forecast, water temperatures, and more!

Get the latest ski resort conditions and snow forecasts.
Airport Delays

Search for airport profiles and view a map of the latest airport delays. Get weather and delay information for hundreds of airports world wide.
At Last! Intellicast now available for iPhone and Android