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Owing to the rain shadow of the coastal mountains, south-central Alaska does not get nearly as much rain as the southeast of Alaska, though it does get more snow with up to 300 inches (7.62 m) at Valdez and much more in the mountains. On average, Anchorage receives 16 inches (410 mm) of precipitation a year, with around 75 inches (1.91 m) of snow.
In late August and early September 1987, a commercial pilot observed a 10.5 km high eruption plume rising through cloud cover near Amukta Island. On September 4, another pilot observed a small dark ash plume issuing from the summit of Amukta (Smithsonian Institution, 1987).
Cloud-cover symbols used on weather teleprinters and aviation reports in the US [6] In the early 20th century, it was common for weather maps to be hand drawn. The symbols for cloud cover on these maps, like the modern symbols, were drawn inside the circle marking the position of the weather station making the measurements.
Ketchikan has a mild maritime or oceanic climate (Köppen: Cfb, Trewartha Dolk), characterized by heavy cloud cover and high humidity through much of the year and abundant rainfall throughout the year (even in the driest month), earning it the nickname of the "Rain Capital of Alaska".
Because of the limited coverage area (the laser can only detect clouds directly overhead), the system computer calculates a time-averaged cloud cover and ceiling, which is reported to external users. To compensate for the danger of rapidly changing sky cover, the averaging is weighted toward the first 10 minutes of the 30-minute averaging period.
Partial cloud cover over the North Atlantic Ocean. Complete cloud coverage over France. The global cloud cover averages around 67-68%, though it ranges from 56% to 73% depending on the minimum optical depth considered (lower when optical depth is large, and higher when it is low, such that subvisible cirrus clouds are counted). [3]
Akhiok (Kasukuak [4] in Alutiiq; Russian: Акхиок) is a second-class city in Kodiak Island Borough, Alaska, United States. Akhiok is Kodiak's southernmost village. The population was 63 at the 2020 census. [5] Akhiok, which does not have a post office, is a rural location in postal code 99615 that belongs to Kodiak.
The North Slope of Alaska (NSA) [4] atmospheric observatory provides data about cloud and radiative processes at high latitudes. This observatory includes a central facility at Barrow (known officially as Utqiaġvik ) and, to the east, the third ARM Mobile Facility at Oliktok Point.