Meteorological
Terms | Explanation |
|---|
| Absolute Maximum | Highest value of the parameter ever recorded. |
| Absolute Minimum | Lowest value of the parameter ever recorded. |
| Air Temperature | Temperature read on a thermometer which is exposed to the air in a position sheltered from direct solar radiation. |
| Amount of Cloud | Percentage of the sky covered by any type of cloud. |
| Bright Sunshine | Period during which solar radiation reaches sufficient intensity to cast distinct shadows. |
| Day with Fog | A day with fog reported at any time during the day. |
| Day with Lightning | A day with lightning reported at any time during the day. |
| Day with Strong Monsoon Signal | A day with Strong Monsoon Signal issued at any time during the day. |
| Day with Thunderstorm | A day with thunderstorm reported at any time during the day. |
| Day with Tropical Cyclone Warning Signals | A day with Tropical Cyclone Warning Signals issued at any time during the day. |
| Dew point Temperature | Temperature to which air must be cooled at constant pressure and water vapor content in order that it shall be saturated with respect to water. |
| Diurnal Range | Difference between the daily maximum and minimum readings. |
| Duration of Rainfall | Duration of rainfall in an hour is the sum of the duration of precipitation recorded in an hour to the nearest 5 minutes. Duration for other periods is the sum of the hourly duration to the nearest whole hour. |
| Evaporation | Amount of water evaporated into the atmosphere from a free water surface. |
| Global Solar Radiation | Sum of direct solar radiation and diffuse sky radiation received by unit horizontal surface. |
| Maximum Air Temperature | Instantaneous maximum reading of the air temperature recorded in a specified period. |
| Maximum Gust | Peak value of wind speed recorded in a specified period. |
| Mean Daily Global Solar Radiation | Average of the daily values of total global solar radiation in a specified period. |
| Mean Daily Maximum Air Temperature | Average of the daily values of maximum air temperature in a specified period. |
| Mean Daily Minimum Air Temperature | Average of the daily values of minimum air temperature in a specified period. |
| Minimum Air Temperature | Instantaneous minimum reading of the air temperature recorded in a specified period. |
| Percentage of Possible Sunshine | Percentage ratio of actual amount of bright sunshine to the total possible between sunrise and sunset. |
| Potential Evapotranspiration | Maximum quantity of water capable of being lost, as water vapor, by a continuous stretch of vegetation covering the whole ground and well supplied with water. |
| Pressure | Atmospheric pressure reduced to mean sea level. |
| Prevailing Wind Direction | Wind direction which occurs more frequently than any other in a specified period. |
| Rainfall | Thickness of the layer of water which accumulates on a horizontal surface, as the result of precipitation, in the absence of infiltration or evaporation |
| Reduced Visibility | Visibility below 8 kilometres, when there is no fog, mist, or precipitation. |
| Relative Humidity | Percentage ration of the actual vapour pressure in the air to the saturation vapour pressure with respect to water at the same temperature and pressure. |
| Sea Surface Temperature | Temperature of the water of the surface layer of the sea. |
| Soil Temperature | Temperature observed in the interior of the soil at different depths. |
| Thunderstorm | One or more sudden electrical discharges manifested by a flash of light(lightning) and a sharp or rumbling sound(thunder). It is regarded to have ceased when no further thunder is heard in 10-15 minutes after the last audible thunder. |
| Wet-bulb Temperature | Temperature read on a thermometer whose bulb is covered by a film of water or ice and which is exposed to the air in a position sheltered from direct solar radiation. |
| Wind Speed | Horizontal movement of air per unit time. |
