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Gulf of Al Aska 124 ¢ U.S. Coast Pilot 9, Chapter 4 Chapter 9, Pilot Coast U.S. 156°N 154°N 152°N 150°N 148°N 146°N 144°N 142°N 140°W 138°W 136°W 16665 16711 16712 UNITED ST 16707 16713 CANADA Valdez 16013 16663 Anchorage AT 16662 ES PRINCE WILLIAM SOUND Whittier Cordova 16016 T E L 16723 N 16709 16747 I 16661 Seward K 60°N O O Cape St. Elias ICY BAY C 16648 16682 16683 16701 YAKUTAT BAY 16700 16761 16647 16645 Middlton Island 16681 16680 16762 16606 LITUYA BAY AFOGNAK ISLAND Cape Spencer 17301 58°N 16760 KODIAK ISLAND GULF OF ALASKA 56°N Chart Coverage in Coast Pilot 9—Chapter 4 19 SEP2021 NOAA’s Online Interactive Chart Catalog has complete chart coverage http://www.charts.noaa.gov/InteractiveCatalog/nrnc.shtml 19 SEP 2021 U.S. Coast Pilot 9, Chapter 4 ¢ 125 Cape Spencer to Cook Inlet (1) This chapter describes the south coast of the Alaska time from August through May. They also prevail at mainland from Cape Spencer to Cook Inlet and the many Cordova during this period. At Valdez, the sheltering passages and tributary waters of Prince William Sound effects of surrounding mountains funnel local winds into and Cook Inlet. Also described are the deepwater ports northeasterlies in winter and southwesterlies in summer. of Valdez, Whittier, Anchorage and Seward, and the Over Controller Bay, summer winds range from the east petroleum terminals and facilities on the Kenai Peninsula, through south and occasionally southwest. Seward’s as well as the numerous fishing and logging ports in this prevailing winds are from the north in winter and south area. in summer. In Cook Inlet, winds are most frequent from the north, with topography causing deflections to the (2) northwest and northeast in some sections. At Anchorage, ENCs - US2AK30M, US2AK20M winter northerlies give way to southeasterlies and Charts - 16016, 16013 southerlies from May through September. At Kenai, northerlies prevail in winter, although gales are often (3) From Cape Spencer the coast extends northwest for out of the east in early winter and southeast later on; about 130 miles to Yakutat Bay. The Fairweather Range summer winds blow out of the south through southwest. begins 20 miles from Cape Spencer and extends to Alsek At Homer, winter northeasterlies give way to summer River. The mountains are snowcapped and have elevations southwesterlies. of 10,000 to more than 15,000 feet. From Alsek River to (8) Precipitation along this coast is also greatly Yakutat Bay the mountains are 4,000 to nearly 6,000 feet influenced by topography. The annual ranges are from high. Along the coast are numerous glaciers with terminal 16 inches (406 mm) at Anchorage to 146 inches (3708 moraines. The most conspicuous are La Perouse Glacier, mm) at Yakutat; records from Latouche, which has since with a sea face 200 to 300 feet high and partly vertical; been abandoned, were 184 inches (4674 mm). Most of Yakutat Glacier, 25 miles east of Yakutat Bay; and the it falls during the winter season. September and October great Malaspina Glacier, west of Yakutat Bay. are often the rainiest months, when precipitation occurs (4) on 20 to 26 days per month on the average, except at the Weather, Cape Spencer to Cook Inlet well-sheltered ports. Snow is likely from October through (5) Winds near the coast are only slightly less variable April. At Valdez, an average of 67 inches (1702 mm) falls than over the open sea. As this coastline is irregular, with in January compared to 7 inches (178 mm) at Kenai. April many islands, channels and inlets and is often steep, through June is often the driest period. there are strong local effects to both wind speed and (9) Poor visibilities are mainly caused by advection or direction. In general, prevailing winds set parallel to the sea fog in the summer and land fog or precipitation in coastline, while speeds are increased by funneling effects winter. In general, sea fog affects exposed ports, while or decreased by blocking. land fog is more of an influence at sheltered spots. (6) The gale frequencies of less than one percent at ports However, visibilities are most likely to drop below one- like Valdez, Anchorage and Cordova can be misleading half mile on winter mornings, even at exposed ports. Land since they are usually much more sheltered than their fog can be very dense for short periods. At Cordova, for approaches. This is reflected in the frequencies of calms, example, visibilities are most likely to be below one-half which range from 12 to 40 percent during the winter mile in January but below two miles in August. Yakutat season. Storms and williwaws are responsible for the suffers from poor visibilities in both midwinter and gales that are most likely in early winter. Williwaws, midsummer, when they drop below one-half mile on up which blow down from the mountains in winter, occur to six days per month. In Cook Inlet, January is usually the along most of the coast; they are particularly severe at foggiest month. This land fog will set in during the night Seward. Extreme sustained winds at these ports have and persist until about noon. Fog banks frequently hang reached 74 knots at Cape Spencer, 66 knots at Anchorage over open waters after the harbors have been cleared. and 70 knots at Yakutat. Gusts of 60 knots or greater occur Occasionally in winter, if extremely cold air moves over almost monthly during the winter season. the water, a steam fog or frost smoke may be experienced (7) In general from Cape Spencer to Yakutat, easterlies as relatively warm water evaporates into much colder air. and southeasterlies are frequent, and from Yakutat to (10) Air temperatures are mild for these latitudes Cook Inlet, northeasterlies and easterlies prevail. At and reflect the influence of the land and the sea. The Yakutat, east winds blow 30 percent or more of the more continental ports have a wide daily and annual 126 ¢ U.S. Coast Pilot 9, Chapter 4 19 SEP 2021 temperature spread compared to those exposed to the sea. (16) Dicks Arm, a narrow inlet less than 200 yards wide A noticeable cooling begins in September, when daytime in places, extends in a north-northeast direction for about highs average in the low to middle fifties °F (11 ° to 14 2 miles along the southeast side of Cape Spencer. From °C), with nighttime lows in the lower forties (5 ° to 6 °C). the head of the arm, a gradually rising valley passes over January is usually the coldest month and is the time when a saddle to Taylor Bay. A narrow channel, with depths of the difference between exposed and sheltered locations 2½ to 12 fathoms leads east of Zip Rock, 20 feet high and is most noticeable. In the sheltered Cook Inlet, average bare, through the off-lying rocks and islets to the inlet. maximums are in the low twenties (-6 ° to -4 °C), while Depths of ¾ to 8 fathoms are found in the inlet to within minimums drop to about 5 °F (-15 °C) or less. At Seward, 0.5 mile of the head, where it is shoal. daytime highs average 30 °F (-1.1 °C), with nighttime (17) Polka Rock, 20 feet high, is 2 miles northwest of lows of 18 F (-7.8 °C). At continental locations like Cape Spencer and at the outer edge of the foul ground, Kenai, Anchorage, and Valdez, temperatures fall below marked by kelp, which extends about 0.5 mile from shore 0 °F (-17.8 °C) on an average of 10 to 15 days in January, in this general vicinity. Small craft approaching Graves compared to 3 days at Seward. Freezing temperatures, Harbor from the southeast usually pass between Polka also more frequent at sheltered locations, are common Rock and Graves Rocks. from October through April. Extreme low temperatures (18) Graves Rocks are a group of islets about 3.5 miles range from a -24 °F (-31.1 °C) at Homer to a -48 °F (-44.4 northwest of Cape Spencer and about 1 mile from shore. °C) at Kenai. A noticeable warming begins in April, and Near the north end of the group is a wooded islet about the difference between the two types of locations becomes 125 feet high. Rocks and kelp patches extend to the less noticeable. Daytime highs in the low to mid forties mainland and along the shore to Cape Spencer. (5 ° to 8 °C), and nighttime lows in the upper twenties to (19) Libby Island, 5.3 miles northwest of Cape Spencer low thirties (-2 ° to 1 °C), are common. July and August and 0.7 mile from the mainland, is high and wooded. Bare are usually the warmest months. Maximums average in rocks and rocks awash extend about 0.3 mile south of the the low to middle sixties (16 ° to 19 °C), while minimums island. Libby Island Light (58°16'24"N., 136°46'26"W.), are frequently in the mid- to upper forties (7 ° to 9 °C). 53 feet (16.2 m) above the water, is shown from a spindle It is often warmest at the more sheltered ports. Extreme with a red and white diamond-shaped daymark on an islet highs reach the mid- to upper eighties (29 ° to 32 °C). southeast of the island. Horn Mountain is a sharp, bare (11) Ice is most often a problem along this coast in Cook peak on the mainland north of Libby Island. Inlet.
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