Instruments for measuring the intensity of incoming radiation are called
The relationship between wind direction and pressure gradient Is stated as follows:
If an observer stands with his back to the wind in the northern hemisphere the lower pressure is
A rainfall with an intensity of 5 mm/h is classified as
On the basis of its intensity, rainfall is classified as:
A precipitation in the form of water droplets of size less than 0.5 mm and intensity less than 1 mm/h is known as
The rainfall is used to describe precipitations in the form of water drops of sizes larger than 0.5 mm. Sleet is frozen raindrops of transparent grain which form when rain falls through air at subfreezing temperature. Hail is a showery precipitation in the form of irregular pallets or lumps of size more than 8 mm. Drizzle is a fine sprinkle of numerous water droplets of size less than 0.5 mm and intensity less than 1 mm/h.
The Indian Meteorological department has changed over from Symon’s, gauge to fibreglass raingauges of two sizes. The collector areas of these gauges are:
The Indian Meteorological department (IMD) has changed over to the use of fibreglass reinforced polyester raingauges, which is an improvement over the system gauge. These come in different combinations of collector and bottle. The collector in two sizes having areas of 200 and 100 cm2 respectively.
In installing a raingauge network, the relevant Indian standard recommend that
If ’p’ is the precipitation, ‘a’ is the area represented by a rain gauge, and ‘n' is the number of rain gauges in a catchment area, then the weighted mean rainfall is
Mean precipitation over an area is best obtained from gauged amounts by
Isohyets are contours of equal rainfall. The orographically weighted isohyets are prepared by tracing paper for mountainous areas and therefore they are more accurate than linearly interpolated isohyets.
Which one of the following defines Aridity index (AI)?
(where AET = Actual Evapotranspiration and PET = Potential Evapotranspiration)
The departure of AI from its corresponding normal value is known as AI anomaly, represents moisture shortage. Based on AI anomaly, the intensity of agricultural drought is classified as follows:
Which one of the following is not a major type of storm precipitation?