from The Century Dictionary and Cyclopedia
- With regard to orography.
Sorry, no etymologies found.
Precipitation is often orographically controlled but generally decreases toward the south.
Precipitation is often orographically controlled but, generally, Ecoregion 15 receives more Pacific climatic influence than Ecoregions 16 and 17.
To their West lie the Pacific Slope forests and more humid strongly orographically determined suites.
Topographically, however -- apart from the three climatic zones of hot, temperate, and cold lands -- the country is divided orographically into two portions by the Isthmus of Tehuantepec, the former consisting of the characteristic mountain-chains and great plateau, and the latter of the immense plains of Yucatan, with a low elevation of not more than 300 feet above sea-level.
The low dips of the Central American Cordilleras to 262 feet (80 meters) at Panama, 151 feet (46 meters) in the Nicaraguan isthmus, and 689 feet (210 meters) at Tehuantepec, present a striking contrast both orographically and historically to the South American
Much of NorCal is likely to see 5-10 inches in the lowlands, with 10-20 inches in orographically-favored areas.
Steve B’s explanation is reasonable, since higher elevations would benefit more directly from the orographically-induced storms…and would have fewer “dry” thunderstorms.