摘要: |
Meteorological spring (March 1-May 31) has sprung, at least in the southern U.S. It is moving steadily north now that the equinox is past and the Northern Hemisphere tilts closer to the sun and the atmosphere warms more and more each day. That heating ultimately fuels the most dangerous form of spring weather - tornado outbreaks. Tornadoes can form anywhere and hit at any time of the day or night, year round and in every state. They usually occur in spring and summer in the late afternoon to evening window of 4 p.m. to 9 p.m., after the sun has done its day's work to heat the atmosphere and the supercells that spawn them have formed. |