31. Apart from orographic features, atmospheric convection plays an important role during the monsoon and the period just preceding it. 32. Bromont is on the edge of the orographic snowbelt created by the Appalachians south of the St-Lawrence Valley. 33. The heaviest rainfall occurred through a process called orographic lift in the mountainous interior, leading to hundreds of landslides. 34. Convection shallowed somewhat, and the eye shrank from 20 orographic enhancement over this terrain is evident on radar imagery. 35. The main influence on U . S . weather is the orographic effect as it is forced over several mountain ranges. 36. In the south, the orographic effect is enhanced by advancing cold fronts from the south, resulting in enhanced precipitation. 37. The Espina?o Range represents a typical site for orographic thunderstorms, which develop from the ascent of air along mountain ranges. 38. Polar cold air outbreaks, cool ocean upwelling, orographic precipitation and the Antarctic Circumpolar Current further affect the regional climate. 39. The air expands and moisture condenses as the winds increase in elevation; this is called orographic lift and can cause precipitation. 40. The effect is enhanced when the moving air mass is uplifted by the orographic influence of higher elevations on the downwind shores.
