* If a cold front from the Pacific arrives, there is a high probability of a storm on Aconcagua * If a warm front arrives, prepare for a later cold front local alterations of barometric pressure and cloudiness on the mountainĪlways keep an eye out for the following occurrences: a low-pressure system moving east from the ocean It is fairly easy to forecast the three factors which bring bad weather: Windblown snow on the summit of Aconcagua is a common occurrence. Also, the Andes mountain range divides a western marine and an eastern continental climate, generating a mountain weather feature known as a Fohn effect (known regionally as Zonda or the viente blanco). These are predicted by a warm front that precedes a cold one (the actual storm occurrence). Typical storms and bad weather on Aconcagua are generated by low-pressure systems called "vaguadas" that move eastwards from the Pacific Ocean. Covering your face and protecting your extremities is important with these weather conditions. Be prepared for a wide diurnal temperature range, which is tiring, and potential for windburn and sunburn. However a clear windless day on Aconcagua is an absolute pleasure, and sometimes you can sunbathe at base camp. Typical wind chill makes it much colder and frostbite is a near constant danger. Conditions at the high camps even in good weather are normally very cold, with temperatures at 0 degrees F when starting out for the summit before sunrise. Rain is rare at the high camps but precipitation in the form of snow is very common, with blizzards and whiteouts to be expected. January and February have the best weather. The winds are extremely strong and it is very cold, with whiteouts common. There are clear indicators that can be seen from base camp, and it is important not to get caught out on summit day during a storm. The forecast for Santiago is often more indicative of what is to come to the mountain than the forecast for Mendoza due to the weather patterns coming in from the Pacific. This is common in the summer, with morning Cumulus developing into deep Cumulonimbus (thunderstorm) clouds in the afternoon.Weather on Aconcagua is variable like any high mountain, but is often cyclical, with short periods of adverse weather often lasting three days followed by longer periods of stable weather. While small Cumulus do not rain, if you notice Cumulus getting larger and extending higher into the atmosphere, it’s a sign that intense rain is on the way. Cumulus clouds do not generally rain – you’re in for fine weather. At this height, air from ground level has cooled to the dew point. If you look at a sky filled with cumulus, you may notice they have flat bases, which all lie at the same level. These “fair weather” clouds look like cotton wool. This warmed air rises by convection and forms Cumulus. On a sunny day, the sun’s radiation heats the land, which in turn heats the air just above it.
For this process to happen, we require air to be forced to rise in the atmosphere, or for moist air to come into contact with a cold surface. At this temperature, water vapour condenses to form droplets of liquid water, which we observe as a cloud. Brett Sayles/Pexels, CC BYĬlouds form when air cools to the dew point, the temperature at which the air can no longer hold all its water vapour.
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