Spain:
periodic droughts
Spratly Islands: typhoons; serious maritime hazard because of numerous reefs and shoals
Sri Lanka:
occasional cyclones and tornadoes
Sudan:
dust storms
Suriname:
NA
Svalbard:
ice floes often block up the entrance to Bellsund (a
transit point for coal export) on the west coast and occasionally
make parts of the northeastern coast inaccessible to maritime traffic
Swaziland:
NA
Sweden:
ice floes in the surrounding waters, especially in the Gulf
of Bothnia, can interfere with maritime traffic
Switzerland:
avalanches, landslides, flash floods
Syria:
dust storms, sandstorms