Gulf of Al Aska
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274 ¢ U.S. Coast Pilot 9, Chapter 6 Chapter 9, Pilot Coast U.S. 160°W 158°W 156°W 154°W 152°W 150°W Chart Coverage in Coast Pilot 9—Chapter 6 C OOK INLET NOAA’s Online Interactive Chart Catalog has complete chart coverage http://www.charts.noaa.gov/InteractiveCatalog/nrnc.shtml Cape Douglas 166°W 164°W 162°W 16603 AFOGNAK ISLAND I T 58°N 16575 A R T 16576 S BRISTOL BAY F 16570 O ND I K LA L IS E H K S IA A D L O S U K I N N E P 16566 16587 N 16568 A Trinity Islands K S A L A 56°N Semidi Islands 16556 Chirikof Island 16553 16561 PAVLOV BAY 16580 16551 Kupreanof Point ISANOTSKI STRAIT 16549 Shumagin Island Unimak Island 16535 GULF OF ALASKA Sanak Island UNIMAK PASS 16547 54°N 16540 26 SEP2021 26 SEP 2021 U.S. Coast Pilot 9, Chapter 6 ¢ 275 Alaska Peninsula (1) This chapter describes the south coast of the Alaska (7) Peninsula from Cape Douglas to Isanotski Strait as well Local magnetic disturbance as the Semidi Islands, Shumagin Islands, Sanak Islands (8) Differences from the normal variation of as much as and many other smaller off-lying islands that fringe this 14° have been observed along the Alaska Peninsula. part of the coast. Also described are Katmai Bay, Wide (9) Bay, Chignik Bay, Stepovak Bay, Unga Strait, Pavlof Currents Bay, Ikatan Bay, Isanotski Strait and many smaller bays (10) A continual current of considerable strength follows and lagoons, and the fishing communities of Sand Point, the coast all the way from Shelikof Strait to the Aleutian King Cove, Cold Bay and False Pass. The north coast of Islands. This west current is considered an eddy that the Alaska Peninsula is described in chapter 8. accompanies the general east drift across the Pacific (2) south of latitude 50°N. and forms a part of the general ENCs - US2AK20M, US2AK5FM circulation of the North Pacific Ocean. Charts - 16013, 16011 (11) The current along the Alaska Peninsula has been called a warm current originating in the Gulf of Alaska (3) Alaska Peninsula, extending southwest over 400 and it doubtless assists in causing the south side of the miles from Alaska mainland (59°30'N., 155°00'W.) to peninsula to be warmer than the Bering Sea side. It is also Isanotski Strait (54°52'N., 163°23'W.), is mountainous well known that the islands off this coast have a milder with many irregular and bold peaks reaching 2,000 to climate than the mainland; almost the entire population 9,000 feet. Pavlof Volcano (55°25'N., 161°54'W.), of the area is found on them as a result. the most prominent of several active volcanos on the (12) The coastal current searches out all the passages, peninsula, has three symmetrical peaks in a general large and small, between and around the many islands, north-south line; the middle and highest peak rises to and in some of them it becomes strong enough to be almost 8,300 feet. Frosty Peak (55°04'N., 162°50'W.), a important. An approaching northeast storm gives warning conspicuous snowcapped mountain with several irregular by strengthening this current; in many places the current peaks near the southwest end of the peninsula, reaches will indicate northeast weather a day before the barometer nearly 5,800 feet. There are many lakes and sizable falls. west winds weaken the current. streams on the peninsula; several portages cross between (13) On three runs between Chirikof Island and Castle the adjacent bays. Rock, a survey ship experienced a south set indicating (4) The south coast of the Alaska Peninsula from Cape an average strength of current of 1.5 knots. Douglas (58°51'N., 153°17'W.) to Cape Pankof (54°40'N., (14) The tidal currents in the vicinity of the south 163°02'W.) is irregular and broken by numerous coast of the Alaska Peninsula are strong in many of the indentations affording anchorage. Some settlements, constricted passages. In the open waters offshore they are canneries and fishing stations are scattered along the coast generally weak. See the Tidal Current prediction service and among the off-lying islands. at tidesandcurrents.noaa.gov for specific information (5) Many of the points are high rugged cliffs with about times, directions, and velocities of the current at offshore reefs, while other points are low with shoal numerous locations throughout the area. Links to a user water extending from the shore. Kelp does not always guide for this service can be found in chapter 1 of this mark rocks and shoals, especially in early or late summer. book. Sometimes only thin ribbon kelp grows on the dangers (15) that is either drawn under by currents and seas or cannot Weather, Alaska Peninsula be seen until the kelp is entered. (16) Winds along the rugged Alaska Peninsula are local (6) Many vessels from southeast Alaska use the Shelikof and variable. At Chignik, they are mostly from the Strait route southeast of the Alaska Peninsula to the Bering west through northwest in early winter, the southeast in Sea. The route is described in chapter 3. The run between midwinter, and southeast through southwest from March Shelikof Strait and Shumagin Islands is one of the most through September. Strong winds often blow from the difficult in Alaska because of the prevalent thick weather Bering Sea through the mountain pass over Chignik Lake. and unknown currents. The current effect near Foggy In the Shumagin Islands, summer winds are often out of Cape (56°31'N., 157°00'W.) is particularly confusing. the southwest, while winter winds frequently blow out of the south. At Cold Bay, southeasterlies are common all 276 ¢ U.S. Coast Pilot 9, Chapter 6 26 SEP 2021 year around. Northwesterlies are also frequent in winter. (22) In summer, west through northwest winds are common. ENCs - US3AK5KM, US4AK5KM In winter, windspeeds at Cold Bay average 15 knots and Chart - 16580 reach gale force about two percent of the time. (17) Annual rainfall ranges from 20 to 60 inches (508 to (23) Cape Douglas (58°51'N., 153°17'W.), the mainland 1524 mm), with heaviest amounts usually occurring on promontory on the west side of the north end of Shelikof the southeast side of the peninsula. At Cold Bay, which Strait, is a grassy peninsula about 3 miles long and 190 averages 36 inches (914 mm) annually, measurable feet high. At its west end it breaks off in a bluff to a low, precipitation falls on 320 days in an average year; on narrow neck that connects it to the mainland. Rocks that nearly half of those days, it snows. September through uncover extend about 0.2 mile east from the cape. November are usually the wettest months, while snow is (24) The three points on the southeast side of Cape common from October through April. Douglas and the small projecting point on the mainland (18) January and February are usually the coldest months in 58°49.8'N., 153°21.3'W., about 1.5 miles southwest of of the year. The average daily maximum is around the Cape Douglas, are reported to be distinctive radar targets freezing mark (0°C) or above on the southeast side of the at 10 miles. peninsula and 3 or 4 degrees cooler on the northwest side. (25) In 1971, the NOAA Ship RAINIER reported that Average daily minimum temperatures on the southeast good anchorage in 12 fathoms, very even sand and mud side range from 16°F (-8.9°C) in the north to 28°F bottom, good holding ground and sheltered from west (-2.2°C) in the south. On the northwest side, they fall to and north weather, could be found about 1.5 miles south an average of 16°F (-8.9°C) at Port Heiden, increasing of Cape Douglas and about 1.5 miles off the mainland to 28°F (-2.2°C) to the south and decreasing to below shore. There is some shelter from southwest and northeast 10°F (-12.2°C) to the north. At Cold Bay, extreme low winds, but if winds are heavy, northeast swells roll around temperatures have fallen to -13°F (-25°C, March 1971), the point. In making the anchorage, keep 2 miles northeast while Coal Harbor has recorded a -19°F (-28.3°C) of the 28-foot-high rock near the center of Douglas Reef, temperature. Temperatures climb steadily from March and maintain a distance of 1.5 miles off the mainland through early August. In August on the average, daytime shore when anchoring. The small projecting point on highs range in the mid-fifties (12° to 13°C) to low sixties the mainland, 1.5 miles southwest of Cape Douglas, is a (16° to 18° C), while nighttime lows drop into the mid- good radar target for approaching the anchorage, and the to upper forties (7° to 9°C). Extreme temperatures have 28-foot-high rock is also a good radar target at 5 miles, reached the mid-eighties (28° to 31°C) at sheltered but only when the tide is high enough to cover the rest of locations. The all-time high for Cold Bay is 77°F (25°C) the reef (half tide or higher). recorded in July 1960. (26) Mount Douglas, 7,064 feet high, and Fourpeaked (19) Though fog may be encountered along this coast at Mountain, 6,903 feet high, are snow-covered mountains any time during the summer, it is most prevalent from west and southwest, respectively, of Cape Douglas.