Top: Drought severity values
by climate divisions for 1998 drought, as of September 12th.
Bottom: Drought severity index for north central Texas by month,
Jan. 1949-Oct.1998. Negative values indicate dry conditions and
positive values indicate wet conditions. |
Extent and length of four droughts.
Maps show the spatial extent and severity of the worst year for
each drought. The decade of the drought along with numbers of
years of the drought are listed to the right of the maps. |
The locations and types of paleoclimatic
evidence for two multidecadal megadroughts is shown on these
maps.
Trees = tree-ring data
Tan regions = data from sand dunes
Blue ovals = lake sediment data
Pottery symbol = archaeological data
Stump symbol = evidence from submerged trees |
