AIR

C° – Air temperature, measured in centigrade degrees %
H – Air humidity, measured as a percentage

The alternation between dry and medium dry seasons compared to the very humid climate of summer monsoon leads to opposite situations in a few hours. The summer monsoon allows the cultivation of rice at the bottom and the accumulation of abundant snow on the Himalayan glaciers at the top, guaranteeing a stable supply.

hPa Pressure, measured in hecto-Pascal
Air is not uniformly distributed over the earth’s crust, but it gets thin, becoming less dense with increasing altitude and changes in atmospheric dynamics among regimes of high, medium and low pressure> P which we measure in hecto-Pascal > hPa
Our AWS have pressure sensors that must be purposely built to operate at high altitudes. Just above the Pyramid the average pressure at sea level 1013 hPa becomes the goal. This severely affects our survival, which can only be guaranteed by proper acclimatization. Physical performances stay limited (as aerobic effort) to about 70% of what they would be at sea level.

m / s Wind intensity, measured in meters per second
Wind direction, measured in degrees
Winds are responses to both horizontal and vertical pressure differences. Winds have intensity and direction (the angle of origin in the form of snow is wind towards north)> that we measure in meters per second and degrees> 1 m / s corresponds to 3.6 km / h, degrees are from 0 ° to 360 ° with 90 ° for East, 180 ° for South, 270 ° for West and 360 ° and 0 ° corresponding to North. The proximity to the ridges facing Tibet and the solar radiation energy of the tropics create wind conditions characterized by great energy and turbulence.

POWER

W / mq Solar radiation, measured in Watts per square meter
The energy that warms the planet from the cosmic frost, allowing life, is the solar radiation which has a maximum of about 1380 w / m2 if measured by satellites. We measure it in watts per square meter> W / m2.
Fascinating sky-high lenticular clouds that appear above our highest stations have taught us that we can measure over 1400 w / m2 thanks to the strengthening of sunlight due to exceptional refractions.

WATER

mm / m2 precipitation, measured in millimeters per square meter
In the form of liquid or snow, as often happens to the highest AWS. Without water, Nepal would be an arid territory without vegetation, most of the steep slopes would be at high risk of erosion. It is measured in mm / m2, i.e. millimeters per square meter. 1 mm / sq m is equivalent to one liter of water distributed over a 1 sq m surface.