DAVIS and Vantage Pro Guía para resolver problemas descargar pdf (Pagina 51)

Rain



You can also use dew point to predict the minimum overnight temperature.

Provided no new fronts are expected overnight and the afternoon Relative

Humidity ≥ 50%, the afternoon’s dew point gives you an idea of what

minimum temperature to expect overnight, since the air cannot get colder

than the dew point anytime.

Rain

Vantage Pro incorporates a tipping-bucket rain collector in the ISS that mea-

sures 0.01” for each tip of the bucket. Your station also logs rain data in inch

units. If you select millimeters for the rain measurement unit, your station still

logs rain data in inches but will convert the logged totals from inches to milli-

meters at the time it is displayed. Converting the logged rain totals reduces

possible conversion losses to a minimum.

Four separate variables track rain totals: “rain storm”, “daily rain”, “monthly

rain”, and “yearly rain”. Rain rate calculations are based on the interval of

time between each bucket tip, which is each 0.01” rainfall increment.

Barometric Pressure

The weight of the air that makes up our atmosphere exerts a pressure on the

surface of the earth. This pressure is known as atmospheric pressure. Gen-

erally, the more air above an area, the higher the atmospheric pressure, this,

in turn, means that atmospheric pressure changes with altitude. For exam-

ple, atmospheric pressure is greater at sea-level than on a mountaintop. To

compensate for this difference and facilitate comparison between locations

with different altitudes, atmospheric pressure is generally adjusted to the

equivalent sea-level pressure. This adjusted pressure is known as baromet-

ric pressure. In reality, the Vantage Pro measures atmospheric pressure.

When you enter your location’s altitude in Setup Mode, the Vantage Pro

stores the necessary offset value to consistently translate atmospheric pres-

sure into barometric pressure.

Barometric pressure also changes with local weather conditions, making

barometric pressure an extremely important and useful weather forecasting

tool. High pressure zones are generally associated with fair weather while

low pressure zones are generally associated with poor weather. For

forecasting purposes, however, the absolute barometric pressure value is

generally less important than the change in barometric pressure. In general,

rising pressure indicates improving weather conditions while falling pressure

indicates deteriorating weather conditions.

Solar Radiation

What we call “current solar radiation” is technically known as Global Solar

Radiation, a measure of the intensity of the sun’s radiation reaching a hori-

zontal surface. This irradiance includes both the direct component from the

sun and the reflected component from the rest of the sky. The solar radiation

1 2 ... 46 47 48 49 50 51 52 53 54 55 56 ... 59 60

Comentarios a estos manuales

Sin comentarios

DAVIS and Vantage Pro Guía para resolver problemas Pagina 51

Comentarios a estos manuales

Relacionado con productos y manuales para Software DAVIS and Vantage Pro