Abstract: Observational evidence from nine crown fires suggests that horizontal roll vortices are a major mechanism in crown-fire spread. Post-burn aerial photography indicates that unburned tree-crown streets are common with crown ...

Abstract: A 1969 Minnesota tornado was photographed by a number of observers at various points along its track. The pictures show an unusual combination of features that might possibly lend visual evidence to theoretical tornado ...

Abstract: Observation shows that three types of horizontal vortices may form during intense wildland fires. Two of these vortices are longitudinal relative to the ambient wind and the third is transverse. One of the longitudinal ...

Abstract: Monthly mean values of meridional transport of sensible heat by the atmosphere in the layer 850-500 mb. over the Northern Hemisphere poleward from the subtropics are analyzed for a period of 3½ years. The latitudinal values ...

Abstract: No abstract available.

Abstract: Computations of atmospheric energy and several of its transformation terms from data extending back to October 1958 have been carried out using the National Meteorological Center's ADP analyses. From these calculations the ...