(724) Anchorage with good holding ground is available anywhere in Port Clarence with the best holding ground on the eastern side. Being very careful in the entrance, shallow-draft vessels will find greater protection in Grantley Harbor.
(726) In approaching Port Clarence from the S in fog or misty weather, the low sand and shingle spit forming the W side of Port Clarence is not visible until close-to. The best procedure is to make a landfall on King Island from the E keeping in depths greater than 10 fathoms to avoid the foul ground N from Cape Rodney. From King Island a course may be set a little E of Cape York to within 3 miles of the coast, thence on course 096° through the entrance into Port Clarence, where good anchorage may be obtained.
(728) The diurnal range of the tide at Port Clarence is subject to radical changes due to meteorological conditions. Moderate to strong S or SW winds of several days? duration will raise the height of the tide in the area without appreciably increasing the range. This is actually a datum change and is appreciable along the entire S coast of the Seward Peninsula. It is reported that continued strong N winds produce a lowered datum, but to a lesser extent.
(730) Along the outside coast W of Point Spencer and S of Cape York there is a general W set of 1 to 2 knots. This velocity is appreciably affected by direction, force, and duration of the wind.
(733) The weather, in general, is better than in the Aleutian Island area, with less fog and fewer bad storms during the short summer navigation season. Fog and high winds are generally of short duration so that it is seldom that planes cannot land at Teller at least once a week. The winter weather is generally better than the summer for plane service, as there is little or no fog during cold weather.