**Fall---The Transition Period**
**Part I of II**
Fall is the time of the year for drastic changes in the weather. The colder drier air associated with the Arctic Front is dipping farther south from Canada into the northern United States.
period - Any function of time f(t) is periodic with period t if f(t) = f(t + t[&tgr;]) for all times t, where t[&tgr;] is the smallest number for which this equality holds.
Period - (1) the time interval for a planet or satellite to complete one revolution on its orbit or (2) the time interval between passages, at a fixed point, of the crest of a wave (e.g.,an electromagnetic wave).
Period Decay (aka decay) The tendency of a satellite to lose orbital velocity due to the influence of atmospheric drag and gravitational forces. A decaying object eventually impacts the surface of the Earth or burns up in the atmosphere.
PD- Period
PDS- Potentially Dangerous Situation, usually in reference to the dangerous threats from a severe weather outbreak.
PG- Pressure gradient. Tightening pressure gradient indicates stronger winds.
Wave period
The average time interval between passages of successive crests (or troughs) of waves.
Weather warnings ...
Wave Period
Time, in seconds for the passage of successive wave crests.
Wave Steepness ...
return period"(Also called recurrence interval.) The average time until the next occurrence of a defined event.
Breakup Period The period of disintegration of an ice cover.
Breezy 15 to 25 mph winds.
Breakup Period
In hydrologic terms, the period of disintegration of an ice cover.
Breezy ...
Shelter Period
The period in which people are forced to evacuate their homes. This time may vary from several hours to a couple of days depending of the severity of the hurricane.
Periodically, the flourishing fish populations commonly found off the west coast of Peru South America are replaced by the sight of dead fish littering the water and beaches.
Period of high wave activity. For the New South Wales (Australia) coastline is normally defined as the time when a Hsig greater than 3 metres is recorded at an offshore wave recording station.
Storm surge ...
Period during which polar ice extends to much lower latitudes than normal.
Ice Cap Climate(6) ...
PERIOD - The time it takes, in seconds, for a full cycle (such as a wave or frequency) to complete. Any frequency given in HERTZ units can be converted to PERIOD (in seconds) by simply dividing 1 by the number of HERTZ. See also HERTZ.
A period of mild weather popularly supposed to recur each year in late January.
NOAA National Weather Service - Cite This Source - This Definition
Browse Related Terms: AMVER/SEAS, Palmer Drought Severity Index, PDSI
Jet - permalink - collapse ...
A period of abnormally hot weather lasting several days.
High pressure ...
A period approximately 18,000 years ago when ice covered a large part of the Earth's surface
Isobar
A line on a weather map linking areas with equal air pressure ...
A period of abnormally and uncomfortably hot weather. It could last from several days to several weeks.
Return Period
Also called recurrence interval. The average time until the next occurrence of a defined event.
For the periodical, see Science (journal).
The Meissner effect causes a magnet to levitate above a high-temperature superconductor.
PD - Period
PG- Pressure gradient. Tightening pressure gradient indicates stronger winds.
Drought - A period when a region has a lack of rainfall. Droughts can affect a fairly small area for a season or an entire continent for years. Too little rainfall can cause shortages in the water supply, destroy crops, and cause widespread hunger.
TIDE The periodic rising and falling of the earth's oceans and atmosphere. It is the result of the tide-producing forces of the moon and the sun acting on the rotating earth.
DUSK The period of waning light from the time of sunset to dark. Related terms: twilight and dawn ...
Ice age- Periods in the history of the earth characterized by a growth of the ice caps towards the equator and a general lowering of global surface temperatures, especially in temperate mid-latitudes.
Quaternary period The latest period of geologic time, covering the most- recent 2,000,000 years of the Earth's history.
Drought A period of abnormally dry weather sufficiently long enough to cause serious effects on agriculture and other activities in the affected area.
During a thaw period, water droplets can fill the pore spaces in soils or road pavements. This is especially true for macropores or the larger cracks and channels.
Droughts- Long periods of low precipitation.
El Niño- An event that occurs every two to seven years in the Pacific Ocean, during which winds shift and push warm surface water towards the coast of south America; it can cause dramatic climate changes.
Drought: A period of abnormally dry weather sufficiently prolonged from the lack of precipitation to cause a serious hydrologic imbalance.
Wave PeriodTime, in seconds, between the passage of consecutive wave crests past a fixed point. Wave SpectrumThe distribution of wave energy with respect to wave frequency or period.
La Niña: a period of strong trade winds and abnormally low sea surface temperatures in the central and eastern tropical Pacific. It is the opposite of an El Niño. Spanish for little girl child.
Medieval warm period A relatively mild episode between about 950 and 1250 A.D.
Mercury barometer A mercury-filled tube used to measure air pressure; the standard barometric instrument, which features great precision.
Astronomic Tide: Periodic variation of the oceans, caused by gravitational forces of the stars mainly from the moon and sun.
Atmosphere: The mass of air involving the Earth.
A term used for a period of warm settled weather in mid to late autumn.
Instability
A state of the atmosphere in which rising air is warmer than its surroundings and continues to rise.
January Thaw: A period of mild weather, usually following a cold spell, which often occurs in late January in the eastern regions of North America, particularly around the Great Lakes region, New England and the Canadian Maritime Provinces.
January Thaw- a period of mild weather popularly supposed to recur each year in late January.
DroughtAbnormally dry weather in a region over an extended period sufficient to cause a serious hydrological (water cycle) imbalance in the affected area. This can cause such problems as crop damage and water-supply shortage.
The average flow in cubic feet per second for any time period is the volume of flow in cfs-days.
SNOWFALL The rate at which snow falls, usually expressed in inches of snow depth over a six hour period. SNOWFLAKES An ice crystal or an aggregate of ice crystals which fall from clouds.
Peak gust In United States weather observing practice, the highest "instantaneous" wind speed recorded at a station during a specified period, usually the 24-hour observation day. Therefore, a peak gust need not be a true gust of wind.
AnomalyThe deviation of a measurable unit (e.g., temperature or precipitation) over a period in a given region from the long-term average, often the thirty-year mean, for that region.
climateThe accumulation of daily and seasonal weather events over a long period of time. It is a description of aggregate weather conditions; the sum of all statistical weather information that helps describe a place or region.
Decadal - A consecutive ten year period.
Degree Day - For any individual day, degree days indicate how far that day's average temperature departed from 65oF. Heating Degree Days measure heating energy demand.
causes of such variations.1) In the most general sense, the term "climate change" encompasses all forms of climatic inconstancy (that is, any differences between long-term statistics of the meteorological elements calculated for different periods but ...
How can I obtain details about periodicals/magazines that are published in the British Isles which deal with meteorology?
A. The British Isles are well served by English language magazines, periodicals etc.
The number of cycles or times that a periodic event occurs during a fixed time interval; the reciprocal of the period of the periodic phenomena.
Sundowner Warm downslope winds that periodically occur along a short segment of the Southern California coast in the vicinity of Santa Barbara.
Flash Flood - A flood which is caused by heavy or excessive rainfall in a short period of time, generally under 6 hours, leading to water that rises and falls quite rapidly.
Their position and intensity govern general weather patterns (e.g., hot/cold, wet/dry) over periods of days, weeks, or months.
Isolated: Showers which are well separated in space during a given period.
Local: Restricted to relatively small areas.
Patchy: Occurring irregularly over an area.
Scattered: Irregularly distributed over an area.
Drought - an extended period of dry weather.
Dust Devil - A small atmospheric vortex not associated with a thunderstorm, which is made visible by a rotating cloud of dust or debris (dust whirl).
barometric tendency—The change of barometric pressure within a specified period of time. In aviation weather observations, routinely determined periodically, usually for a 3-hour period.
beam resolution—See resolution.
during periods of isentropic lift, when an unstable layer of air is present aloft.
Growing Season - The period of time between the last killing frost of spring and the first killing frost of autumn.
Gust - A brief sudden increase in wind speed. Generally the duration is less than 20 seconds and the fluctuation greater than 10 mph.
Day length: duration of the period from sunrise to sunset.
Dew-point (dew point temperature): the temperature to which air must be cooled (at constant pressure and constant water vapor content) for saturation to occur.
Climate: A representation of a region's weather over a given period of time. A region's climate is often characterized in terms of the average and variation of the climate system over periods of a month or more.
On a buoy report, Average Wave Period is the average period (seconds) of the highest one-third of the wave observed during a 20 minute sampling period.
AWC
Aviation Weather Center ...
El Niño - The name given to the periodic warming of the ocean that occurs in the central and eastern Pacific. A major El Niño episode can cause extreme weather in many parts of the world.
 See also: Weather, Temperature, Surface, Water, Air
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