of 370 m above sea level, with the rim of the caldera reaching a height of . Following the formation of the caldera, numerous satellite cones and lava domes have formed on the flanks of the volcano. They include Mount Tulik () on the caldera's southeastern slope, Mount Idak () to the northeast, and Jag Peak. A crater lake once filled much of the caldera to a depth of over , but the lake ultimately drained through a notch eroded in the northeast rim. The prehistoric lake attained a maximum depth of about and the upper surface reached an elevation of about , at which point it over topped the low point of the caldera rim. Small, shallow remnants of the lake remained north of Cone D at an altitude of about : a small shallow lake located between the caldera rim and Cone D; a smaller lake (named Cone B Lake) farther north near the caldera's gate. After the 2008 eruption, the hydrogeology of the caldera was greatly changed with five separate sizable lakes now emplaced. In addition to the caldera lakes, Cone A, Cone E, Cone G and the new 2008 vent on Cone D contain small crater lakes. The volcano is currently rated by the Alaska Volcano Observatory as Aviation Alert Level Green and Volcanic-alert Level Normal. To the north from Mount Recheshnoi, in the valley of Geyser Creek are located geothermal fields with geysers. In 1988 here were active 5 geysers up to 2 m high and 9 natural fountains up to 0.7 m high. Umnak has a subarctic climate (Köppen: Dfc), which borders on a subpolar oceanic climate (Köppen: Cfc) with short, mild to warm summers and long, cold, snowy winters. Eruptions On Saturday July 12, 2008, Okmok Volcano on Mount Okmok, located on Umnak, erupted for several days, through a fresh vent sending wet, ash and gas-rich plume that reached an altitude of in the air and forcing the evacuation of Fort Glenn, a private cattle ranch located on the island. Ash fell not only on the eastern part of the island but also on a fishing village on the northeast. However, the Aleut village, Nikolski, on the opposite side of Umnak Island with a population of about 40 people to the west of Okmok Volcano escaped from the southeasterly path of the ash clouds. The ash plume also disrupted operation of flights to