5.2. Behavior of the FVI
The slopes of LSTz (middle panel) and WBz (lower panel) for each
month where positive and negative FVI values were detected illustrate
the interactions that drive the FVI (top panel) (Fig. 4). Areas experiencing
negative FVI from April through October are highly consistent with
areas experiencing decreasing interannual monthly temperatures
(LSTz slopes). FromApril through July, area showing decreased temperatures
in association with negative FVI increased fromlargely the North
Cascades, Northern Rockies, and West Cascades to the whole study