trends in relation to FVI as trends in temperature,with some notable exceptions
in June and July. In June, in the northwest part of the study area,
especially the northern Coast Range and the northern part of the North
Cascades, trends in water deficitwere positive, even while trends in the
remaining study areawere largely in the opposite direction. Interestingly,
locationswhere there has been a decreasing trend inWBz slopes are
locations where there has also been a trend towards decreasing LSTz
slopes, the combined effect of which has been towards negative FVI
values, consistent across the study areamore broadly. In July,we see decreasing
WBz slopes across large areas of the east-southeast region of
the study area, but little to no effect on the FVI turning positive, suggesting
a need for tight coupling between trends in LST andWB to turn the
FVI positive. August is interesting because while the areal extent with
negative WBz slopes decreased across the east-southeast region, some
locations where the Juniper type group experienced a positive FVI
(Table 1) were affected more by negative trends in water balance than
trends in temperature, a relative anomaly in this regard. In September,
where we saw the most dramatic increases in FVI values, there was a
tight coupling between trends in both driving variables.