Backing:A counter-clock movement in the wind direction.
Back Door Cold Front: When a cold fron moves from east to west.
Backing: When the wind moves counter-clock-wise.
Back Scatter: A signal that is energy reflected by precipitation or ground clutter.
Ball Lightning: It is a rare ball of electrical charged air redish in color which last for a very short duration.
Balloon Ceiling: The height of the base of the clouds observed and measured with a weather balloon or ceiling balloon.
Baroclinic Atmosphere:Isotherms move across the isobars or contours.
Barogram:A written record of the atmospheric pressure: (Graph)
Barograph:A weather instrument used to measure atmospheric pressure. It consists of an aneroid cell which
responds to atmospheric air pressure. A pen is attacted to the cell through a series of gears and levers. This pen rides on a chart.
The pen has ink on and it produces a trace on the chart. The chart is attached to a drum which sits on the clock. The clock runs up to five days.
Barometer:A weather instrument used to measure atmospheric pressure.
Barometer:Invented By: Evangelista Torricelli: In 1643.Born in Italy 1608. Died 1647. Physicist...Mathematician.
Barometric Pressure:The standard barometric pressure at sea level is 1013.25 mb...760 mm or 29.92. inches of mecury...14.7 lbs. per square inch at a standard temperature of 59 degs. F.
Barometric Pressure: Atmospheric pressure indicated on a barometer.
Barometric Pressure: Drops 1 inch for each 1,000 feet in altitude. Example: Pressure at sea level 30.00 inches. At 5,000 feet the pressure would be 25.00 inches of mecury.
Barometric Pressure Tendency:The tendency as to whether the barometric pressure is rising or falling.
Barotropic Atmosphere: Isotherms move in the same direction as the isobars or contours.
Beaufort Wind Scale:Admiral Francis Beaufort: Admiral in the Royal British Navy invented the "Beaufort Wind Scale 1806.
Bergeron Process:The process of ice crystals in the atmosphere growing larger at the expense of supercooled water droplets.
This is due to the saturation vapor pressure over "Ice" is lower than over "Water".
Bermuda High: A large area of high pressure located over the Eastern United States to Bermuda.
BINOVC: Acronym for: Breaks In The Overcast: Cloudy skies with some breaks.
BKN: Broken.
Black Body:The Sun & the Earth are almost perfect "Black Bodies" which absorb and emit all wavelengths of radiation.
Blizzard: Winds 35+ mph. Heavy snow with visibility 1/4 miles or less.
Blizzard Warnings:Blizzard Warnings are issued by the National Weather Service when heavy snow, winds of 35 mph and low visibilty is imminent or is occuring.
Blowing Dust: Dust pick up and blown about by the wind.
Blowing Sand: Sand pick up and blown about by the wind.
Blowing Snow:Snow lifted to 6 feet or more above the surface of the ground.
Blowing Spray: Water pick up and blown about by the wind.
Blue Jets: Large dim flashes of light which appear above thunderstorms.
Blustry: Winds 15 to 25 mph.
BlZD: Blizzard.
Bow Echo: A term used to describe a line of thunderstorms in the form of a bow. This type of weather pattern can produce high winds in excess of 70 mph with straight line damage.
Bowen Ratio:The ratio between "Sensible Heating" and "Latent Heating". The ratio of heat used for "Sensible Heat" (conduction and convection) to heat used for "Latent Heat" (vaporization of water) expressed in percent.
Broken Sky Condition: When the sky cover is 0.6 through 0.9.
BTU: British Temperature Unit: The amount of heat require to raise a pound of water 1 Degree Fahrenheit. (70 to 71 degrees).
Buys Ballot's Law: When in the Northern Hemisphere, standing with your back to the wind, the lower pressure is to your left.
The opposite is in the Southern Hemisphere.

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