Abstract: Thirty years of daily 1000?500 mb thickness data from 25?90°N latitude at 383 grid points are used to obtain charts of mean temperature change in the lower troposphere between successive 5-year periods from 1949?53 to ...

Abstract: Deviations of the 1000?500 mb thickness from the 1949?76 mean (the period of record) and from the 1965?76 mean (a period of apparent warning in the lower troposphere) are presented for the Northern Hemisphere (25?85°N), ...

Abstract: A complete operational method for quantitative precipitation forecasting (Q.P.F.), is developed by combining the technique for determining large scale vertical velocities by Penner with one for determining precipitable ...