a cold front along which squalls or thunderstorms are likely
strong gale
Noun
wind moving 47-54 knots
sandstorm
Noun
a windstorm that lifts up clouds of dust or sand
sirocco
Noun
a windstorm that lifts up clouds of dust or sand
sky glow
Noun
illumination of the night sky in urban areas
snow eater
Noun
a warm dry wind blowing down the eastern slopes of the Rockies
southwester
Noun
a strong wind from the southwest
southeaster
Noun
a strong wind from the southeast
southern lights
Noun
the aurora of the southern hemisphere
systemic circulation
Noun
circulation that supplies blood to all the body except to the lungs
sou'easter
Noun
a strong wind from the southeast
sandblast
Noun
a blast of wind laden with sand
sandblast
Verb
grind with a sandblast
silver storm
Noun
a storm with freezing rain that leaves everything glazed with ice
shooting star
Noun
a streak of light in the sky at night that results when a meteoroid hits the earth's atmosphere and air friction causes the meteoroid to melt or vaporize or explode
self-induction
Noun
generation of an electromotive force (EMF) in a circuit by changing the current in that circuit
sea-level pressure
Noun
the atmospheric pressure reduced by a formula to the pressure at sea level
starlight
Noun
the light of the stars
sunlight
Noun
the rays of the sun
sunbeam
Noun
a ray of sunlight
sunray
Noun
a ray of sunlight
sunray
Noun
a ray of artificial ultraviolet light from a sunray lamp
sunray
Noun
herb having a basal cluster of grey-green leaves and leafless stalks each with a solitary broad yellow flower head
sound pressure
Noun
the difference between the instantaneous pressure at a point in a sound field and the average pressure at that point
specific heat
Noun
the heat required to raise the temperature of one gram of a substance one degree centigrade
sky wave
Noun
a radio wave that is reflected back to earth by the ionosphere or a communications satellite
sphacelus
Noun
the localized death of living cells (as from infection or the interruption of blood supply)
sphacelus
Noun
necrotic tissue
solar halo
Noun
a luminous halo parallel to the horizon at the altitude of the sun
sundog
Noun
a bright spot on the parhelic circle
sprites
Noun
atmospheric electricity (lasting 10 msec) appearing as globular flashes of red (pink to blood-red) light rising to heights of 60 miles (sometimes seen together with elves)
solar magnetic field
Noun
the magnetic field of the sun
sympathetic vibration
Noun
(physics) vibration produced by resonance
serendipity
Noun
good luck in making unexpected and fortunate discoveries
solar gravity
Noun
the gravity of the sun
sphagnum
Noun
any of various pale or ashy mosses of the genus Sphagnum whose decomposed remains form peat
supertwister
Noun
the most powerful tornado which can create enormously devastating damage
sex linkage
Noun
an association between genes in sex chromosomes that makes some characteristics appear more frequently in one sex than in the other
sphagnum moss
Noun
any of various pale or ashy mosses of the genus Sphagnum whose decomposed remains form peat
solar parallax
Noun
the angle subtended by the mean equatorial radius of the Earth at a distance of one astronomical unit
short wave
Noun
a radio wave with a wavelength less than 100 meters (a frequency greater than 3 megahertz)
surface tension
Noun
a phenomenon at the surface of a liquid caused by intermolecular forces
simoom
Noun
a violent hot sand-laden wind on the deserts of Arabia and North Africa
syzygy
Noun
the straight line configuration of 3 celestial bodies (as the sun and earth and moon) in a gravitational system
simoon
Noun
a violent hot sand-laden wind on the deserts of Arabia and North Africa
samiel
Noun
a violent hot sand-laden wind on the deserts of Arabia and North Africa
skin effect
Noun
the tendency of high-frequency alternating current to distribute near the surface of a conductor
sleet
Noun
partially melted snow (or a mixture of rain and snow)
sleet
Verb
precipitate as a mixture of rain and snow
semi-climber
Noun
a plant that tends to climb and on occasion can grow like a vine