on Tristan da Cunha, last eruption in
1961

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

Serbia
destructive earthquakes

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 rarely destructive; geologically
active region with frequent earthquakes, tremors, and volcanic
activity; tsunamis

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 m 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; numerous reefs and shoals pose a serious
maritime hazard

Sri Lanka
occasional cyclones and tornadoes

Sudan
dust storms and periodic persistent droughts

Suriname
NA

Svalbard
ice floes often block 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
drought

Sweden
ice floes in the surrounding waters, especially in the Gulf