Luftbild. Die Einsturzdoline von Winter Park, Mittel-Florida. (Photogaphie aérienne. La doline d'effondrement de Winter Park, Floride centrale)
En mai 81, un effondrement s'est produit dans un quartier commercial de Winter Park, dans la banlieue NO d'Orlando. En deux jours le diamètre du trou a atteint 107 m et une profondeur de 30 m. Ce type de phénomène est relativement courant en Floride
The recreational vehicle ( RV ) camp or park accomomdates retirees in the U.S. Sunbelt. In the winter months, Arizona receives more than 70 000 seasonal residents who live in their vehicles clustered into specially-designed retirement communities
A five-year analysis of winter air circulation over western North America and the eastern Pacific suggests that the serious drought of 76-77 was associated with an abnormally high frequency of normally occurring flow patterns rather than entirely
transition. The occurence of debris flows accompanying major aggradation from 12 000 to 10 000 B.P. suggests more intense winter storms during this period.