The 12 hour Surface Analysis map shows current weather conditions ... Use of surface analyses began first in the United States, spreading worldwide during the 1870s. Use of the Norwegian cyclone ...

Severe thunderstorms are expected to sweep eastward from the Midwest and South Sunday, then into the East by Monday. You can track the threat for tornadoes, damaging winds, hail and flooding here ...

The 24 hour Surface Analysis map shows current weather conditions ... Use of surface analyses began first in the United States, spreading worldwide during the 1870s. Use of the Norwegian cyclone ...