HomeFactopediaBrainoffsRankingsCommunityLog In
You know 0 facts


Your overall rating on Weather =
Your best rally score on Weather = 0 facts

Play Fact Master on Weather    

Challenge Friends to a Brainoff on Weather    

Play a Rally Game on Weather    

See also:
Cloud Types and Terms, Clouds, Atmospheric Phenomena and Snow and Ice

118 facts:

Acid Rain
Cloud or Rain Droplets Containing Pollutants
Such as oxides of sulfur and nitrogen, to make them acidic.
Adiabatic Lapse Rate
Change in Air Temperature As It Moves Altitudes
The Horizontal Transfer of Atmospheric Properties by Moving Air (wind)
Such as heat or moisture
Air Mass
A Large Body of Air Having Similar Horizontal Temperature and Moisture Characteristics
The Mixture of Gases Composing the Atmosphere
Oxygen accounts for 20.946% of the total
The Ratio of Radiation Reflected Compared With the Amount Striking an Object
High albedos are highly reflective substances, such as snow
Anabatic Wind
Wind Created by Air Flowing Uphill
As an example, valley breezes
An Area of High Pressure
Area of pressure with a rotation opposite that of earth
Anvil Zits
Frequent Localized Lightning Discharges Occurring from Within a Thunderstorm Anvil
Descriptive of Extremely Dry Climates
Opposite of humid
The Gaseous Envelope Surrounding the Earth
Composed primarily of nitrogen and oxygen.
Back Door Cold Front
A Front That Moves East to West in Direction
Rather than the normal west to east movement. For instance, one that enters Southern New England from the Gulf of Maine.
Black Ice
Thin, New Ice That Forms on Fresh Water or Dew Covered Surfaces
It is common on roadways during the fall and early winter and appears "black" because of its transparency.
Blowing Dust
Reduction of Visibility by Winds Blowing Across Dry Ground
Usually with little or no foliage.
Bow Echo
A Radar Signature Associated With Severe Thunderstorms
Broken Clouds
Clouds Which Cover Between 6/10 and 9/10 of the Sky
The Absence of Wind
The Height of the Lowest Layer of Clouds
When the sky is broken or overcast.
The Absence of Clouds
A Region's Long Term Weather Conditions
A Sudden, Intense Rainfall That is Normally of Short Duration
A Visible Collection of Water Droplets or Ice Crystals
The Merging of Two Water Drops Into One Larger Drop
Cold Front
Leading Edge of Advancing Cold Mass
The State of Low Thermal Energy
The Process in Which Water Vapor Turns from Gas to Liquid
Opposite of evaporation
Coriolis Force
An Apparent Force Caused by the Rotation of the Earth
In the Northern Hemisphere winds are deflected to the right, and in the Southern Hemisphere to the left.
Horizontal Movement of Water or Air
Gulf stream, jet stream
Cut off Low
An Area of Low Pressure Aloft Cut off from Its Associated Jet Stream
An Area of Low Pressure
Moisture That Has Condensed on Objects Near the Ground
Whose temperatures have fallen to the dew point temperature.
Dew Point
The Temperature to Which the Air Must Be Cooled for Water Vapor to Condense
The Regions on Either Side of the Equator Where Air Pressure is Low and Winds Are Light
A Severe Localized Downdraft from a Thunderstorm
Water Droplets of .5 Mm or Less
Falls from stratus clouds
Dry Line
A Boundary Separating Moist and Dry Air Masses
Dust Devil
A Small, Rapidly Rotating Wind Made Visible by the Dust It Picks up
Also called a whirlwind, it develops best on clear, dry, hot afternoons.
El Nino
A Major Warming of the Equatorial Waters in the Pacific Ocean
El Nino events usually occur every 3 to 7 years, and are characterized by shifts in "normal" weather patterns.
The Total Amount of Water Transferred from the Surface to the Atmosphere
Eye Wall
The Ring of Thunderstorms That Surrounds a Storm's Eye
The heaviest rain, strongest winds and worst turbulence are normally in the eye wall.
Flood Crest
The Highest Stage or Flow Occurring in a Flood
A Cloud at the Earth's Surface
Occurs during calm conditions
Freezing Level
The Altitude in the Atmosphere Where the Temperature Equals 32F
Freezing Rain
Rain Which Falls As Liquid then Freezes Upon Impact
Resulting in a coating of ice on exposed objects.
A Boundary Between Two Air Masses
Water Vapor Forming As a Solid on Objects Colder the Surrounding Air at or Below Freezing
Fujiwhara Effect
The Rotation of Two Storms Around Each Other
Winds of 63 to 87 Kilometers Per Hour over Water
Greenhouse Effect
The Warming of the Atmosphere by the Trapping of Earth's Longwave Radiation
The gases most responsible for this effect are water vapor and carbon dioxide.
Ground Fog
Fog Produced by the Cooling of the Lower Atmosphere in Contact With the Ground
When it comes in contact with the ground. Also known as radiation fog.
Gust Front
The Leading Edge of the Downdraft from a Thunderstorm
A Sudden, Short Increase in Wind Speed
Usually lasting 20 seconds or less
Precipitation in the Form of Circular or Irregular-shaped Lumps of Ice
Rings or Arcs That Seem to Encircle the Sun or Moon
They are caused by the refraction of light through the ice crystals in cirrus clouds.
Hard Freeze
Freeze Where Vegetation is Killed and the Ground Surface is Frozen Solid
Fine Dry or Wet Dust or Salt Particles in the Air That Reduce Visibility
Heat Index
The Combination of Temperature and Humidity
Used to reflect how the temperature feels rather than the actual temperature
Heat Lightning
Lightning That Can Be Seen, but is Too Far Away for the Thunder to Be Heard
The Center of an Area of High Pressure
Accompanied by anticyclonic and outward wind flow in the northern hemisphere. Also known as an anticyclone.
The Amount of Water Vapor in the Air Relative to Temperature
A Severe Tropical Cyclone With Sustained Wind Speeds in Excess of 74 Mph
Indian Summer
An Unseasonably Warm Period Near the Middle of Autumn
Usually following a substantial period of cool weather.
Solar Radiation Received at Earth's Surface
Derived from, 'incoming solar radiation
An Increase in Temperature With Height
The reverse of the normal cooling with height in the atmosphere.
Jet Stream
Fast Moving Air at a Height of About 11km
Influential on directing weather systems
Lapse Rate
The Change in Temperature With Altitude in the Atmosphere
An Electrical Discharge from a Thunderstorm
La Nina
A Cooling of the Equatorial Waters in the Pacific Ocean
The Center of an Area of Low Pressure
Accompanied by cyclonic and inward wind flow in the northern hemisphere. Also known as a cyclone.
A Strong, Damaging Wind Flowing Downward from a Thunderstorm Affecting a Diameter of 4 Km or More
Measurable Precipitation
Precipitation of 0.01" or More
The Rotating Updraft in a Supercell Thunderstorm
A Strong, Damaging Wind Flowing Downward from a Thunderstorm Affecting a Diameter of 4 Km or Less
A Cloud at the Earth's Surface
Visibility between one and two km
Occluded Front
A Complex Frontal System That Occurs when a Cold Front Overtakes a Warm Front
Also known as an occlusion.
Orographic Uplift
The Vertical Forcing of Air by Terrain Features Such As Hills or Mountains
This can create orographic clouds and/or precipitation.
Air That Flows Outward from a Thunderstorm
Sky Condition when 9/10 or 10/10 of the Sky is Covered
A Form of Oxygen Containing 3 Molecules, Usually Found in the Stratosphere
Responsible for filtering out much of the sun's ultraviolet radiation.
A Soil Layer Below the Surface of Tundra Regions That Remains Frozen Permanently
Polar Air
A Mass of Very Cold, Very Dry Air That Forms in Polar Regions
Liquid or Solid Water Molecules That Fall from the Atmosphere and Reach the Ground
The Force Exerted by the Interaction of the Atmosphere and Gravity
Also known as atmospheric pressure.
Optical Phenomenon when Light is Refracted and Reflected by Moisture in the Air
Liquid Water Droplets That Fall from the Atmosphere
Having diameters greater than drizzle.
Relative Humidity
The Amount of Water Vapor in the Air Relative to to the Amount the Air Could Hold if Totally Saturated
Compared to the amount the air could hold if it was totally saturated. Expressed as a percentage.
An Elongated Area of High Pressure at the Surface or Aloft
Scattered Clouds
Sky Condition when Between 1/10 and 5/10 of the Sky is Covered
Severe Thunderstorm
A Strong Thunderstorm With Wind Gusts in Excess of 58 Mph
Precipitation That is Intermittent, in Space, Time, or Intensity
A Type of Frozen Precipitation, Consisting of Small Transparent Ice Pellets
Frozen Precipitation Composed of Ice Particles in Complex Hexagonal Patterns
Squall Line
A Non-frontal Band or Line of Thunderstorms
Stationary Front
A Transition Zone Between Air Masses
With neither advancing upon the other.
A Low Pressure Disturbance Composed of Wind, Clouds and Precipitation
Straight-line Winds
Any Wind Not Involving Rotation
A Downward Movement of Air
Subtropical Jet
The Branch of the Jet Stream That is Found in the Lower Latitudes
A Highly Organized Thunderstorm With a Rotating Updraft
Also known as a mesocyclone. It poses an inordinately high threat to life and property. Often produces large hail, strong winds, and tornadoes.
Sustained Winds
The Wind Speed Obtained by Averaging the Observed Values over a One Minute Period
Small Rising Column of Air Due to Surface Heating
The Sound Wave Produced As a Lightning Stroke Heats the Air Causing It to Rapidly Expand
There are roughly 18,000 thunderstorms occurring on Earth at any given moment.
A Storm With Lightning and Thunder, Produced by a Cumulonimbus Cloud
Usually associated with gusty winds, heavy rain, and sometimes hail and tornadoes.
A Violently Rotating Column of Air Below the Base of a Thunderstorm
And in contact with the ground. A tornado does not require the visible presence of a condensation funnel cloud.
Trace Precipitation
Precipitation Amounts Less Than 0.01"
Trade Winds
Persistent Low-level Tropical Winds
They blow from the subtropical high pressure centers towards the equatorial low.
Tropical Depression
Tropical Mass of Thunderstorms With a Cyclonic Wind Circulation
Winds between 20 and 34 knots.
Tropical Disturbance
An Organized Mass of Tropical Thunderstorms With Slight Cyclonic Circulation
A slight cyclonic circulation and winds less than 20 knots.
Tropical Storm
An Organized Cyclone in the Tropics
Wind speed between 35 and 64 knots.
An Elongated Area of Low Pressure at the Surface or Aloft
Disrupted Flow in the Atmosphere That Produces Gusts
A Hurricane That Forms in the Western Pacific Ocean
Vertical Shear
The Vertical Rate of Change of Wind Speed or Direction
Precipitation Falling from the Base of a Cloud and Evaporating Before It Reaches the Ground
Warm Front
Trailing Edge of Retreating Cold Mass
A Column of Rotating Air over a Body of Water
I.e., a tornado over the water.
Wind Shear
The Change of Wind Speed or Direction With Distance or Height
A Hot Wind During Unsettled Summer Weather in the Mediterranean

Facts contributed by:

guinness john


   About - Terms - Privacy Log In