Diurnal variation is the changes of value, for example, of a meteorological element within the course of a (solar) day. More especially, it denotes the systematic changes that occur during the average day.
diurnal - Daily, especially pertaining to actions that are completed within 24 hours and that recur every 24 hours; thus, most reference is made to diurnal cycles, variations, ranges, maxima, etc.
diurnal inequality"In oceanography, a difference between the heights of the two high waters and of the two low waters of a lunar day.
Diurnal - Daily; related to actions which are completed in the course of a calendar day, and which typically recur every calendar day (e.g., diurnal temperature rises during the day, and diurnal falls at night).
DIURNAL Pertaining to actions or events that occur during a twenty-four hour cycle or recurs every twenty-four hours.
Diurnal: Daily, pertaining to actions completed within or that recur every 24 hours.
Divergence: The horizontal spreading of air that can lead to sinking motions.
diurnal: referring to daily phenomena.
drought: a long period of time where there is abnormally dry weather due to little or no precipitation.
DIURNAL EFFECTS- A reference to an effect that has its origins due to daytime heating, such as afternoon cumulus cloud development or the formation of a lake/sea breeze. These phenomena dissipate once the sun goes down and surface heating is lost.
Diurnal Cycles
Variations in meteorological parameters such as temperature and relative humidity over the course of a day which result from the rotation of the Earth about its axis and the resultant change in incoming and outgoing radiation.
diurnal—Daily, especially pertaining to a cycle completed within a 24-hour period, and which recurs every 24 hours.
Diurnal Arc The apparent arc described by heavenly bodies from their rising to their setting.
Diurnal Performed in twenty-four hours, such as the diurnal revolution of the Earth.
diurnal (daily) rhythm of air pressure in northern Germany (black curve is air pressure) ...
Diurnal: daily, especially pertaining to actions which are completed in 24 hours and are repeated every 24 hours.
Divergence: the net flow of air from a given region. Compare convergence.
Diurnal Variation
The fluctuation in a weather element over a period of 24 hours.
Divergence ...
DIURNAL - An event that occurs daily, such as daytime heating due to solar insolation. Convective systems, such as sea / land breeze development, which develop in the late afternoon and dissipate at night, are DIURNAL events.
A diurnal coastal breeze that blows onshore, from the sea to the land. It is caused by the temperature difference when the surface of the land is warmer than the adjacent body of water.
62 gauss at the north poleGeomagnetic StormIn solar-terrestraial terms, a worldwide disturbance of the earth's magnetic field, distinct from regular diurnal variations.
Since temperature rises little during the day, there is little diurnal variation in rain induced fog. Improvement in visibility cannot be expected until the rain stops or moves out of the affected area.
Heliotropic wind A subtle, diurnal component of the wind velocity leading to a diurnal shift of the wind or turning of the wind with the sun, produced by the east-to-west progression of daytime surface heating. Helium (He) An inert gas.
Thermally Driven CirculationA diurnally reversing closed cellular wind current resulting from horizontal temperature contrasts caused by different rates of heating or cooling over adjacent surfaces; includes along-slope, cross-valley, ...
UNSTBLUnstableUp-valley WindA diurnal thermally driven flow directed up a valley's axis, usually occurring during daytime; part of the along-valley wind system.UpdraftA small-scale current of rising air.
In either case, there is no corresponding diurnal barometric gradient variation, so this is a surface effect. If W is the surface wind, and G the geostrophic wind, the ratio W/G increases with temperature.
An artificial satellite that revolves around the earth at the same speed and direction as the earth's diurnal rotation, thereby maintaining a synchronous position with points on earth; these satellites orbit approximately 35, ...
Disturbance: A small area of low pressure.
Diurnal:Daily.
Divergence:In the atmosphere when air diverges it sinks, moves clock wise and outward creating
"High Pressure" Centrifugal Force. Compressional Warming. Anti-Cyclonic conditions.
[Slang] Showers and thunderstorms that form on a scattered basis with little or no apparent organization, usually during the afternoon in response to diurnal heating.
Duration of the period from sunrise to sunset.
NOAA National Weather Service - Cite This Source - This Definition
Browse Related Terms: diurnal, Diurnal Cycles, mean, Tides
dBZ - permalink - collapse ...
However, the SWI will underestimate the convective potential for cool layers extending above 850 mb. It also does not take in account diurnal heating or moisture below 850 mb. As a result, one must be very careful when using this index.
[ In subtropical/tropical regions, 24 hour changes are usually used, to eliminate the influence of diurnal changes. ]
Reports of rainfall (or melted snowfall) should be in mm.
 See also: Pressure, Temperature, Weather, Surface, Air
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