. Compendium de la météorologie. La météorologie. En cas de brouillard brouillard 1187 conditions à New Orleans Airport [12], d'autres localités nécessitent un traitement plus complexe que cela. Par exemple, Fig. 8a, b et c montrent les. Pas de brouillard brouillard X Fig VARIABLE. 7.-Une méthode typique pour la prévision d'advection et de rayonnement le brouillard pour New Orleans Airport, au cours de l'hiver (après de Hil- worlh [12]). Les données sont tirées du vent de gradient supérieur de l'après-midi vent-son. étapes nécessaires avec les méthodes actuelles de prévision ce tj''pe du brouillard à Charleston, S. C, pendant les mois d'automne. D'autres encore et différentes méthodes sont utilisées pour le

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. Compendium of meteorology. Meteorology. FOG 1187 during fog conditions at New Orleans Airport [12], Other localities require more complicated treatment than this. For instance, Figs. 8a, b, and c show the. FOG X NO FOG VARIABLE Fig. 7.—A typical method for forecasting advection-radia- tion fog for New Orleans Airport during winter (after Hil- worlh [12]). The data are gradient winds taken from the afternoon upper-wind sounding. steps required with present methods for forecasting this tj''pe of fog at Charleston, S. C, during the fall months. Other and still different methods are used for the remaining seasons. Pre-Warmjrontal Fog. The forecasting methods for this class of fog usually given in textbooks are rather general in nature and sometimes they are omitted altogether. It is difficult to find much literature on the subject which would be of real assistance to an in- vestigator wishing to learn how to forecast these oc- currences. Perhaps the biggest difficulty is the vaguely recognized fact that local geography again plays a dominant role. For example, pre-warmfrontal fogs occur very rarely at Cleveland, probably due either to down- slope compressive heating in the cold air or to the frictional divergent effects caused by the proximity of Lake Erie, or to both. At this locality, the clouds con- sistently remain well above the ground in pre-warm- frontal situations, Avhile at Atlanta, Washington, D. C, and Chicago, fogs formed in this way are common. Some rather ingenious methods have been utilized for forecasting the formation of low stratus in warm- front situations. An example is Roche's graph [21] for Charlotte, N. C, shown in Fig. 9. In nearly all such methods, however, the authors have used synoptic ma- terial which was readily available in a practical sense. Not much effort has been made to apply quantitatively any relationship between temperature of falling pre- cipitation and the surface air layers, which Petterssen has pointed out to be very importa

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