NW Northwest Configuration and help
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On this page you can find the meaning of the different icons used in the portal in an informative way. They can be used as a complement to the recorded temperatures and data.
Here you can consult information on atmospheric symbols, wind, UV indices and our main recommendations for your safety.
Atmospheric symbols
 | Fog |
 | Clear skies |
 | Sunny intervals |
 | Cloudy skies |
 | Overcast |
 | Sunny intervals with light rain |
 | Cloudy skies with light rain |
 | Overcast with light rain |
 | Sunny intervals with moderate rain |
 | Cloudy skies with moderate rain |
 | Overcast with moderate rain |
 | Sunny intervals with thundershowers |
 | Cloudy skies with thundershowers |
 | Overcast with thundershowers |
 | Sunny intervals with thundershowers and hail |
 | Cloudy skies with thundershowers and hail |
 | Overcast with thundershowers and hail |
 | Sunny intervals with snow |
 | Cloudy skies with snow |
 | Overcast with snow |
 | Sunny intervals with sleet |
 | Cloudy skies with sleet |
 | Overcast with sleet |
 | Cloudy intervals with heavy rain |
 | Cloudy with heavy rain |
 | Overcast with heavy rain |
 | Fog |
 | Clear skies |
 | Partly cloudy |
 | Cloudy skies |
 | Overcast |
 | Partly cloudy with light rain |
 | Cloudy skies with light rain |
 | Overcast with light rain |
 | Partly cloudy with moderate rain |
 | Cloudy skies with moderate rain |
 | Overcast with moderate rain |
 | Partly cloudy with thundershowers |
 | Cloudy skies with thundershowers |
 | Overcast with thundershowers |
 | Partly cloudy with thundershowers and hail |
 | Cloudy skies with thundershowers and hail |
 | Overcast with thundershowers and hail |
 | Partly cloudy with snow |
 | Cloudy skies with snow |
 | Overcast with snow |
 | Partly cloudy with sleet |
 | Cloudy skies with sleet |
 | Overcast with sleet |
 | Cloudy intervals with heavy rain |
 | Cloudy with heavy rain |
 | Overcast with heavy rain |
Rainfall
| 70 % 2.1 mm |
Accumulated precipitation` is defined as the amount of precipitation (rain, snow, sleet, hail) falling during a given time period (1 hour, 3 hours, 1 day, etc.). It can be measured in litres per square metre (l/m²) and expressed in the equivalent unit millimetres (mm). 1 litre of precipitation falling into 1 square metre would have a depth of 1 mm (the water would rise 1 mm from the ground). It can also be expressed in inches (in), the following relationship exists between all these units:
1 l/m2 = 1 mm = 0.039 in
´Chance of precipitation` represents the probability of any type of precipitation (rain, snow, sleet, hail) during a given time period (1 hour, 3 hours, 1 day, etc.) It should be noted that the ´chance of precipitation` is not related to the amount of ´accumulated precipitation`, that is to say, a greater amount of ´accumulated precipitation` does not represent a greater ´chance of precipitation`.
Wind
| Southeast 17 - 45 km/h |
Wind is defined as the movement of air with respect to the surface of the Earth due to differences in atmospheric pressure between different locations. ´Average wind speed` represents the average speed of the wind over a given time period (1 hour, 3 hours, 1 day, etc.) while ´maxiumum gusts` represents the maximum wind speed during the same time period.
NW Northwest N North NE Northeast W West E East SW Southwest S South SE Southeast | Icon | Speed (km/h) | Description | Effects on land |
|---|---|---|---|
 | 0 to 1 km/h | Calm | Calm, the smoke rises vertically |
 | 2 to 5 km/h | Weak wind | The smoke indicates the wind direction |
 | 6 to 11 km/h | Weak wind | The leaves of the trees begin to fall, the mills in the field begin to turn |
 | 12 to 19 km/h | Weak wind | The leaves shake, the flags wave |
| 20 to 28 km/h | Moderate wind | Dust and papers blow around, tree tops shake |
 | 29 to 38 km/h | Moderate wind | Small movements of trees, wavy lake surfaces |
 | 39 to 49 km/h | Moderate wind | Tree branches move, difficult to keep the umbrella open |
 | 50 to 61 km/h | Strong wind | Large trees move, difficult to walk against the wind |
 | 62 to 74 km/h | Strong wind | Tree tops break, difficult for people to move around |
 | 75 to 88 km/h | Very strong wind | Damage to trees, impossible to walk against the wind |
 | 89 to 102 km/h | Very strong wind | Trees uprooted, structural damage to buildings |
 | 103 to 107 km/h | Hurricane wind | Destruction everywhere, heavy rains, floods |
 | >= 118 km/h | Hurricane wind | Cars, trees, houses, roofs and people flying around, can generate a hurricane or typhoon |
UV Index
What is the UV Index?
The UV index is a measure of the intensity of ultraviolet (UV) radiation from the Sun at the level of the Earth's surface. It serves to guide us in avoiding overexposure to the Sun and possible skin lesions.
The sun emits energy at different wavelengths. Part of it comes in the form of ultraviolet waves harmful to life. Some of this energy is absorbed by the ozone layer at high levels, another part reaches the surface of the Earth. The UV index measures the component that reaches the surface of our planet.
What is SPF?
The SPF or Sun Protection Factor is a value that gives us an idea of how long it would take to burn if we have used sunscreen. For example, a cream of SPF 15 would indicate that it would take 15 times longer to burn than in those same conditions without using cream.
According to the World Health Organization, it is recommended that all persons, regardless of race and skin type, use a photoprotective product with an SPF of at least 15 (blocks 93% of UV radiation B) and that, in addition, offers broad spectrum (also blocks the UVA radiation) protection.
What does the intensity of UV radiation depend on?
- The height of the Sun: The higher the sun in the sky, the more intense the UV radiation. Thus, the intensity of UV radiation varies according to the time of day and the time of year. Outside the tropics, the highest intensities of UV radiation occur when the sun reaches its maximum height, around solar noon during the summer months.
- Latitude: The closer to the equator, the more intense the UV radiation.
- Cloudiness: The intensity of UV radiation is maximum when there are no clouds, but can be high even with clouds. The dispersion can produce the same effect as reflection by different surfaces, increasing the total intensity of UV radiation.
- Altitude: At higher altitude the atmosphere is thinner and absorbs a lower proportion of UV radiation. With every 1000 meter increase in altitude the intensity of UV radiation increases by 10 to 12%.
- Ozone: Ozone absorbs part of the UV radiation that could reach the earth's surface. The concentration of ozone varies throughout the year and even the day.
- Ground reflection: Different types of surfaces reflect or disperse UV radiation to varying degrees; For example, recent snow can reflect up to 80% of UV radiation; dry sand on the beach about 15% and the foam of sea water about 25%.
What scale regulates the UV Index?
According to the World Health Organization, the UV Index is classified by the following scale.
| UV Index | Risk | Photoprotection | Who advice |
|---|---|---|---|
| 1 2 | Low | It is not necessary | Remain outside without risk! |
| 3 5 6 7 | Moderate High | SPF 6 - 10 SPF 15 - 25 | Avoid direct sunlight during the middle hours of the day. Keep skin covered, use sun glasses, a hat and sun protection (SPF). |
| 8 10 11+ | Very High! Extreme! | SPF 25 - 50 SPF 50+ | Avoid going outside in the middle hours of the day. Seek shade. It's important to stay covered, use sunglasses, a hat and sun protection (SPF). |
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