A piteraq is a cold
katabatic wind
A katabatic wind (named ) is a downslope wind caused by the flow of an elevated, high-density air mass into a lower-density air mass below under the force of gravity. The spelling catabatic is also used. Since air density is strongly dependent o ...
which originates on the
Greenland
Greenland is an autonomous territory in the Danish Realm, Kingdom of Denmark. It is by far the largest geographically of three constituent parts of the kingdom; the other two are metropolitan Denmark and the Faroe Islands. Citizens of Greenlan ...
ic icecap and sweeps down the east coast. The word "piteraq" means "that which attacks you" in the local language.
Danish Meteorological Institute
The Danish Meteorological Institute (DMI; ) is the official Danish meteorological institute, administrated by the Ministry of Climate, Energy and Utilities. It makes weather forecasts and observations for Denmark, Greenland, and the Faroe Is ...
The Observed Climate of Greenland, 1958–99
p. 96 Piteraqs are most common in the autumn and winter. Wind speeds typically reach 50 to 80 m/s (180–288 km/h; 111–178 mph).
Causes
The Greenland ice sheet cools the air directly above it. Colder air is denser, and it sinks, forming a separate layer of cold air in between warmer air. A piteraq is triggered by low pressure systems off the east coast of Greenland. Piteraqs affect not only coastal towns, but also large areas of the sea to the east of Greenland.
On February 6, 1970, at about 6:00 PM, the community of
Tasiilaq was hit by the worst documented piteraq ever in Greenland (estimated at 90 m/s — about 325 km/h or 200 mph) (Stronger than a category five Atlantic hurricane) causing severe damage. Since the beginning of 1970, special piteraq warnings have been issued by the
Danish Meteorological Institute
The Danish Meteorological Institute (DMI; ) is the official Danish meteorological institute, administrated by the Ministry of Climate, Energy and Utilities. It makes weather forecasts and observations for Denmark, Greenland, and the Faroe Is ...
.
Although piteraqs can be caused by low pressure systems off the east coast of Greenland, their formation is a combination of several factors: the temperature on the Greenland ice sheet, the conditions in the fjords, and the current atmospheric conditions. When a low-pressure system is approaching the coast of Greenland it generally has strong winds that can "suck" in air off the Greenland ice sheet, causing a Piteraq. Mild piteraqs are far more common than severe ones; on average, there are 1-3 severe piteraqs in the Tasiilaq region yearly, and usually dozens of weaker events.
Current research
Due to the fact that Piteraqs occur in such an isolated and sparsely populated area, research on their cause is lacking. As of 2023 there are several ongoing studies on Piteraqs, but the data has not yet been made available to the public.
Notable occurrences
The most notable and easily the most powerful Piteraq to strike Tasiilaq occurred on February 6, 1970, when the wind speeds were estimated at 325 km/h. Another notable piteraq happened on September 26, 2022, but was much less powerful and long lasting, with sustained winds up to 160 km/h and gusts up to 210 km/h.
This storm was said to cause some damage to the town such as broken windows and removed shingles and siding.
See also
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Williwaw
In meteorology, a williwaw (archaic spelling williwau) is a sudden blast of wind descending from a mountainous coast to the sea. The word is of unknown origin, but was earliest used by British seamen in the 19th century. The usage appears for win ...
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Bora (wind)
The bora is a northerly to north-easterly katabatic wind in areas near the Adriatic Sea. Similar nomenclature is used for north-eastern winds in other littoral areas of eastern Mediterranean and Black Sea basins.
Name
It is known in Greek as (' ...
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Mistral (wind)
The mistral (; ; Corsican: ''maestrale''; ; ; ; ) is a strong, cold, northwesterly wind that blows from southern France into the Gulf of Lion in the northern Mediterranean. It produces sustained winds averaging 31 miles an hour (50 kilometres ...
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Santa Ana winds
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Oroshi
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Katabatic wind
A katabatic wind (named ) is a downslope wind caused by the flow of an elevated, high-density air mass into a lower-density air mass below under the force of gravity. The spelling catabatic is also used. Since air density is strongly dependent o ...
References
* https://www.whoi.edu/oceanus/feature/piteraqs/
Winds
Environment of Greenland
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