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GM Screen
Mastering the Wild
/
Weather in the Wilderness
/
Weather Baseline
Elevation
Source
Ultimate Wilderness pg. 166
While the climate sets baselines for temperatures, elevation plays a key factor as well. Elevation can affect the baseline temperature, and it sets the baseline intensity of precipitation in the region, as explained below and displayed in Table 4–13: Elevation Baselines.
Sea Level
: Temperatures in sea-level and coastal regions are 10º warmer. Sea-level regions also tend to have more precipitation than areas of higher elevation, so the baseline precipitation intensity in a sea-level region is heavy.
Lowland
: Lowlands are areas of low elevation not near the coast, generally at an elevation of 1,000 to 5,000 feet. This elevation range does not alter baseline temperatures. The baseline precipitation intensity in lowlands is medium.
Highland
: Highlands include regions with elevations above 5,000 feet. Decrease baseline temperatures in highlands by 10º (although in particularly arid and flat regions, you should instead increase the baseline temperature by 10º, while in particularly high-altitude regions such as significant mountain ranges, you should instead decrease the baseline temperature by 20º). The frequency of precipitation is decreased by one step, and baseline precipitation intensity is medium.
Table 4-13: Elevation Baselines
Elevation
Altitude Range
Baseline Temp. Adjust.
Baseline Precipitation Intensity
Sea level
Below 1,000 ft.
+10º F
Heavy
Lowland
1,000 ft. to 5,000 ft.
—
Medium
Highland
Above 5,000 ft.
-10º F
Medium (decrease precipitation frequency by one step)