Republic of the Congo

Saint Helena:
active volcanism on Tristan da Cunha

Saint Kitts and Nevis:
hurricanes (July to October)

Saint Lucia:
hurricanes and volcanic activity

Saint Pierre and Miquelon:
persistent fog throughout the year can be
a maritime hazard

Saint Vincent and the Grenadines:
hurricanes; Soufriere volcano on
the island of Saint Vincent is a constant threat

Samoa:
occasional typhoons; active volcanism

San Marino:
NA

Sao Tome and Principe:
NA

Saudi Arabia:
frequent sand and dust storms

Senegal:
lowlands seasonally flooded; periodic droughts

Seychelles:
lies outside the cyclone belt, so severe storms are
rare; short droughts possible

Sierra Leone:
dry, sand-laden harmattan winds blow from the Sahara
(December to February); sandstorms, dust storms

Singapore:
NA

Slovakia:
NA

Slovenia:
flooding and earthquakes

Solomon Islands:
typhoons, but they are rarely destructive;
geologically active region with frequent earth tremors; volcanic
activity

Somalia:
recurring droughts; frequent dust storms over eastern
plains in summer; floods during rainy season

South Africa:
prolonged droughts

South Georgia and the South Sandwich Islands:
the South Sandwich
Islands have prevailing weather conditions that generally make them
difficult to approach by ship; they are also subject to active
volcanism

Southern Ocean:
huge icebergs with drafts up to several hundred
meters; smaller bergs and iceberg fragments; sea ice (generally 0.5
to 1 meter thick) with sometimes dynamic short-term variations and
with large annual and interannual variations; deep continental shelf
floored by glacial deposits varying widely over short distances;
high winds and large waves much of the year; ship icing, especially
May-October; most of region is remote from sources of search and
rescue

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, c