Surface weather analysis is a special type of weather map that provides a view of weather elements over a geographical area at a specified time based on information from ground-based weather stations.

Surface Prognostic Charts are historical surface prognostic (forecast) charts created by the United States Weather Bureau. They include fronts, isobars, cloud, and precipitation areas.

Intellicast Merges with Weather Underground Starting January 17, 2019, we began redirecting traffic from Intellicast.com to wunderground.com. Even though the Intellicast name and website will be going away, the technology and features that you have come to rely on will continue to live on wunderground.com.

Highs and Lows High-pressure systems are also called anticyclones or just highs. Low-pressure systems are called cyclones or lows. The surface analysis chart shows highs with a large blue H and lows with a large red L. Lows are typically associated with stormy weather.