Dew Point (or Dew-point Temperature) - A measure of atmospheric moisture. It is the temperature to which air must be cooled in order to reach saturation (assuming air pressure and moisture content are constant).
Dew point (dew-point temperature) The temperature to which a given parcel of air must be cooled at constant pressure and constant water-vapor content in order for saturation to occur.
**Dew Point**
"N O T E" All weather articles written by the author, weather records for Bath, Pa. USA, graphs, graphics, pictures, are copyrighted and are owned by the author.
The dew point determines relative humidity. When the relative humidity is high, the dew point is closer to the current air temperature. If the relative humidity is 100%, the dew point will be equal to the current temperature.
Dew points indicate the amount moisture in the air. The higher the dew points, the higher the moisture content of the air at a given temperature.
Dew Point Temperature-The temperature to which the air must be cooled for water vapor to reach saturation, i.e. cloud formation.
Dew Point (Dewpoint Temperature) - a measure of atmospheric moisture; the temperature to which air must be cooled for saturation to occur (given a constant pressure and constant water-vapor content) ...
dew point: the certain temperature at which dew begins to form and water vapor chages to liquid form.
doldrums: area near equator that experiences low pressures and light shifting winds.
DEW POINT The temperature to which air must be cooled at a constant pressure to become saturated.
Dew Point- the temperature to which a certain amount of air must be cooled in order for saturation to occur (a cloud or fog to form); the drier the air the lower the dew point and the more air is needed to be cooled for a cloud or fog to form.
DEW POINT
The temperature to which air must be cooled at a constant pressure to become saturated.
Dew Point - The point at which the air at a certain temperature contains all the moisture possible without precipitation occurring. When the dew point is 65oF, one begins to feel the humidity.
Dew Point or Dew Point Temperature: The temperature to which a parcel of air must be cooled at constant water vapour content (and constant pressure) for saturation to occur.
Dew Point - As the surface of the earth cools at night, warm moist air near the ground is chilled and water vapour in the air condenses into droplets on the grass and other objects.
Dew Point - The temperature to which air has to be cooled in order to reach saturation.
Diffraction - The slight bending of light as it passes sharp edges.
dew point (or dew-point temperature)—The temperature to which a sample of air must be cooled, while the mixing ratio and barometric pressure remain constant, in order to attain saturation with respect to water.
Dew point- The temperature at which condensation begins.
Droughts- Long periods of low precipitation.
dew point- temperature at which air at constant pressure must cool to become saturated with water vapor, followed by condensation.
down draft- a rapidly descending column of cooling air that causes heavy rains and violent wind gusts.
Dew Point - The temperature at which water starts to condense out of a particular air mass. The dew point temperature changes only when the moisture content of the air changes. The higher the dew point, the greater the moisture content is in the air.
Dew Point- The temperature to which a certain volume of air must be cooled to bring the relative humidity to 100 percent.
Disturbance- An area of low-pressure in which storm conditions occur.
Dew Point
The temperature at which air becomes saturated with water vapour. I.e. the relative humidity is 100 %.
Diurnal Variation ...
Dew point below freezing.
Frostbite
Human tissue damage caused by exposure to intense cold.
Dew PointDPDOn a buoy report, dominant wave period (seconds) is the period with the maximum wave energy.
Td 850 is the dew point temperature at 850 mb,
TT is the total-totals index,
f 850 is the 850-mb wind speed (in knots),
f 500 is the 500-mb wind speed (in knots), and ...
Frost Point Dew point below freezing.
Fractus Ragged, detached cloud fragments; same as scud.
Friction Head The decrease in total head caused by friction.
Dew pointThe temperature to which the air must be cooled for water vapor to condense and form fog or clouds.Diamond dustA fall of non-branched (snow crystals are branched) ice crystals in the form of needles, columns, or plates.
Radiation FogA fog that forms when outgoing longwave radiation cools the near-surface air below its dew point temperature.
Total-Totals IndexA stability index and severe weather forecast tool, equal to the temperature at 850 mb plus the dew point at 850 mb, minus twice the temperature at 500 mb.
ADVECTION FOG Fog that develops when warm moist air aloft moves over a colder surface, cooling that air to below its dew point. An example is Arctic Sea Smoke, a form of sea fog.
Dew Water condensed onto objects at or near the ground, due to the fact that their temperatures have fallen below the dew point temperature of the surrounding air, but not below freezing. Dew cell An instrument used to determine dew point.
The moisture term is derived from the dew point depression at a single atmosphere level. This index has been shown to be correlated with large fire growth on initiating and existing fires where surface winds do not dominate fire behavior.
In general, the differences in temperature, dew point, and winds measured at the 850 mb and 500 mb levels of the atmosphere are considered in this index. Values of 250 or greater indicate a potential for severe weather.
16 What is the dew point?
2A.17 What's the difference between Humidity and Relative Humidity?
2A.18 Does the dew point temperature have to be above a certain value for a thunderstorm?
2A.19 Why does the weather sometimes get 'stuck in a rut'?
2A.
The 850 dew point provides information on the moisture content of the lower atmosphere. The vertical extent of the moist layer is represented by the difference of the 700 mb temperature and 700 mb dew point.
A stability index and severe weather forecast tool, equal to the temperature at 850 mb plus the dew point at 850 mb, minus twice the temperature at 500 mb.
For condensation to occur at the dew point water vapor needs a surface to condense on. In the atmosphere water vapor starts to condense on microscopic particles suspended in the air: dust, soot, volcanic ash, salt spray, etc.
Black frost occurs when the dew point is too low for frost to form. That is the temperature is below zero but there is not enough moisture in the air to produce a visible frost.
A tabulation used to obtain the dew point, vapor pressure or the relative humidity of the air from the observed dry-bulb and wet-bulb temperature readings obtained by a psychrometer. These tabulations have been prepared from a semi-empirical formula.
It is created when the temperature and the dew point of the air have become the same, or nearly the same, and sufficient condensation nuclei are present. It is reported as "FG" in an observation and on the METAR.
Advection fog Occurs when warm, moist air moves over a cold surface and the air cools to below its dew point.
Measure or Index of atmospheric instability used to assess the strength of storms and for severe weather forecasts. A combination of calculations relating to the air temperature and dew point temperature at different levels of the atmosphere.
 See also: Dew, Temperature, Air, Surface, Weather
|
