normal"1. Referring to a normal distribution. 2. Regular or typical in the sense of lying within the limits of common occurrence, but sometimes denoting a unique value, as a measure of central tendency.
Normal Conditions
La Niña
The graphs above are called distribution curves.
NORMAL
The recognized standard value of a meteorological element as it has been averaged in a given location over a fixed number of years. Normals are concerned with the distribution of data within limits of common occurrence.
Normal Water Surface Elevation (Normal Pool Level) The lowest crest level of overflow on a reservoir with a fixed overflow level (spillway crest elevation).
Normal
The long-term average value of a meteorological paramater (i.e., temperature, humidity, etc.) for a certain area.
Normal - To understand whether precipitation and temperature is above or below normal for seasons and longer timescales, normal is defined as the average weather over 30 years. These averages are recalculated every ten years.
NORMAL- The average of a certain weather parameter over several years (commonly 30 or more years). For example, the normal yearly precipitation being 30 inches means that over a 30 year period the average is 30 inches per year.
normal—In meteorology, the value of an element averaged for a given location over a period of years and recognized as a standard.
numerical forecasting—See numerical weather prediction.
The Normal Supply of Moist Air From the Gulf of Mexico Was Reduced.
NDVI (Normalized Difference Vegetation Index)- an index produced using AVHRR data from NOAA polar orbiting satellites. The index is used for monitoring vegetation changes over large areas with a resolution up to 1 km.
Range Normalization: A receiver gain function in the radar which compensates for the effect of range (distance) on the received power for an equivalent reflectivity.
Normally high pressure is located in the eastern Pacific off the shores of Ecuador and Peru, likewise, low pressure is situated over the western Pacific in the area of Indonesia and Australia.
Normal Winter El Niño Winter Images by: DAS, University of Washington
The amplification led to a warming in the near-Pacific regions of North America, extending from Alaska to the northern Plains of the United States (orange shading).
Normal Pacific pattern. Equatorial winds gather warm water pool toward west. Cold water upwells along South American coast.
La Niña Conditions. Warm water is further west than usual.
Normal- A numerical figure representing the average of conditions at a location over a period of years.
Numerical Forecasting- Forecasting the weather through digital computations carried out by supercomputers.
Normally used when referring to snow or sand particles are deposited behind obstacles or irregularities of the surface or driven into piles by the wind.
DRIZZLE ...
METARS are normally issued either hourly or half hourly, but if there is a significant change in conditions at the site, a SPECI (special report) may be issued. See also SYNOP.
Meteogram ...
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normal lapse rate is a global average rate of temperature reduction with elevation (6.4 °C/1000 m)
environmental lapse rate is the actual lapse rate on a given day at a specific location ...
The letters are normally assigned in alphabetical order as the pressure feature in question either appears from the west (or elsewhere), or develops in situ.
A rise above the normal water level along a shore caused by strong onshore winds and/or reduced atmospheric pressure. The surge height is the difference of the observed water level minus the predicted tide.
Storm Surge: An abnormal rise in sea level accompanying a hurricane or other intense storm, and whose height is the difference between the observed level of the sea surface and the level that would have occurred in the absence of the cyclone.
Knot- Unit of speed normally used for marine and aviation purposes. One knot (one nautical mile per hour) is equal to 1.15 mph or 0.5144 m/s.
KTS
Knots ...
Bitterly coldIn winter, bitterly cold or very cold, refers to more than seven degrees Celsius below normal.
CLAn abbreviation used on climate outlook maps issued by CPC to indicate areas where equal chances of experiencing below-normal, normal, and above-normal conditions are possible.
If the target it strikes is well beyond the normal range of the radar, it will take longer for the back scattered energy to arrive back at the radar.
STORM SURGE The increase in sea water height from the level that would normally occur were there no storm.
Flanking LineA line of cumulus or towering cumulus clouds connected to and extending outward from the most active part of a supercell, normally on the southwest side.
ANOMALOUS PROPAGATION (AP)Non-standard atmospheric temperature or moisture gradients will cause all or part of the radar beam to propagate along a non-normal path.
The ratio of the normal annual rainfall to the normal annual evaporation.
Issuance is normally site specific. However, winds of this magnitude occurring over an area that frequently experiences such windsWind ChillReference to the Wind Chill Factor; increased wind speeds accelerate heat loss from exposed skin, ...
absorption coefficient A measure of the amount of radiant energy, incident normal to a planar surface, that is absorbed per unit distance or unit mass of a substance.
The obstructing, on a large scale, of the normal west-to-east progress of migratory cyclones and anticyclones.
Jet Stream(abbrev. JSTR) Relatively strong winds concentrated in a narrow stream in the atmosphere, normally referring to horizontal, high-altitude winds. The position and orientation of jet streams vary from day to day.
backscattered radiationThe scattering of radiant energy into the hemisphere of space bounded by a plane normal to the direction of the incident radiation and lying on the same side as the incident ray.
Wall clouds can range from a fraction of a mile up to nearly five miles in diameter, and normally are found on the south or southwest (inflow) side of the thunderstorm.
The system normally collects data by rotating the dish through 360 degrees at a prescribed elevation. When that scan is completed, the elevation is increased slightly and another scan is performed at the new elevation.
(abbrev. MCC)- A large MCS, generally round or oval-shaped, which normally reaches peak intensity at night.
To find the force on a plane surface normal to the wind, we can use the impulse-momentum principle mΔv = FΔt.
It was thought that the residual heat of summer stored in the ground was released under sunny skies and helped produce temperatures that were well above normal for the late autumn.
A measure of low level wind shear, normally within the lowest 3 km of the atmosphere, relative to the movement of a thunderstorm (thus referred to as 0-3 km Storm Relative Helicity).
VISIBILITY A measure of the opacity of the atmosphere, and therefore, the greatest distance one can see prominent objects with normal eyesight. The National Weather Service has various terms for visibility.
Storm Surge: An abnormal rise local rise in sea level accompanying an intense storm system, either tropical or extratropical caused by the storm pushing a wall of water ahead of it.
To monitor these changes, a baseline of "normal" performance characteristics must be obtained.
Front: Surface front, normally represented as a line in the synoptic charts, is the zone along which the frontal surface intercepts the surface of the Earth.
Appears as a white solid around -110 (F) that sublimes to a gas at normal atmospheric pressure. The absence of any "liquid" present during this sublimation gives the name "dry ice". Used as a deep-freeze coolant and scientific applications.
Such thunderstorms normally occur within a tropical or warm, moist air mass during the summer afternoon as the result of afternoon heating and dissipate soon after sunset.
Normally this region has a more or less regular decrease of air temperature with increasing altitude, considerable vertical wind motion, appreciable water vapor, and weather.
Last update 6 June 1996 Edward J. Hopkins, Ph.D.
The ocean-atmosphere interactions in the tropical and equatorial Pacific region involving abnormal sea surfae temperatures and atmospheric pressures. These abnormalities often result in changes in the trade winds.
Acid rain- Rain that contains more acid than normal.
Air mass- A huge body of air that has similar temperature, pressure, and humidity throughout.
Air pressure- A force that is the result of the weight of a column of air pushing down on an area.
Inversion In meteorology, a departure from usual (normal) decrease or increase with altitude of the value of an atmospheric property; also, the layer through which this departure occurs (the inversion layer).
La Niña: An extensive, below normal cooling of the central and eastern tropical Pacifice Ocean
Land breeze: A wind that blows offshore, from land to water.
Lapse rate: The decrease of temperature with increasing altitude.
Storm surge An abnormal rise of the sea along a shore; primarily due to the winds of a storm, especially a hurricane.
Stratocumulus A low cloud, predominantly stratiform, with low, lumpy, rounded masses, often with blue sky between them.
Tropical wave: A kink or bend in the normally straight flow of surface air in the tropics which forms a low pressure trough, or pressure boundary, and showers and thunderstorms. Can develop into a tropical cyclone. ...
Flood
(Flooding) The overflowing by water of the normal confines of a stream or other body of water, or the accumulation of water by drainage over areas which are not normally submerged.
Mixing depth - the maximum height air pollution normally reaches. This varies with geography, season and time of day.
Monsoon - A wind caused by differences in surface temperatures. Some produce heavy rains.
STANDARD PRESSURE - The average pressure normal for a given height above sea level.
STEP - The notch on the bottom of a float. 'Getting on the step' means taxiing on the front part of the float.
A region of relatively high pressure where air is descending through the atmosphere normally brings dry and settled weather. Winds on the surface blow clockwise around it in the northern hemisphere and anti-clockwise in the southern hemisphere.
Degree Day- a measure of the departure of the daily mean temperature from the normal daily temperature; heating and cooling Degree Days are the departure of the daily mean temperature from sixty-five degrees Fahrenheit.
High Cloud - A cloud that normally has its base above 6000 meters; the base may be lower in winter and at high-latitude locations.
The gaseous form of a substance that is normally a liquid, for example water vapour
W
Wind ...
 See also: Air, Temperature, Surface, Weather, Water
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