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10.1

Sector 10. Micronesia, Palau, and Guam

An average of one storm per year originates in or passes over

the Mariana Islands. The storms are as a rule relatively small in diameter, though often very intense near the center. They usu- ally occur from July to January.

10.1

The Caroline Islands are under the influence of the dol-

drum’s belt, from June through November. During this period, heavy rains, thunderstorms, and violent squalls will sometimes offer hazards. Cumulus and cumulonimbus clouds with ceil- ings sometimes reduced to 152 to 305m for short periods, poor visibility, lighting, and confused seas accompany the more in- tense of these storms. Most are of short duration and seldom cover and area larger than 20 or 25 miles in diameter. The storms usually move from E to W and occur most frequently at 0600.

10.1

The East Caroline Islands are swept by the Northeast Trades.

East, NE, or E winds blow almost constantly from December through April. The average rate is 8 knots. From May until De- cember, E to SE winds increase in frequency and predominate in September through November, with and average rate of 5 knots. Averages were computed from land station records; vel- ocities are higher over the open sea. Gales rarely occur. Over the open sea, winds are usually strongest about 0300 and lightest about 1400.

10.1

In the Truk Group, the Northeast Trades are very steady,

between November and June; 85 per cent of the winds blow from NNE to E directions. By July, however, the indraft of the summer monsoon carries E to S winds from this area into Asiatic waters; thereafter through October, the trade winds are overshadowed by various S to W breezes, with an average 13 per cent of calms.

10.1

In the Ponape Island area, the Northeast Trades predominate

at all seasons of the year, and blow with great steadiness over the N part of the area, between November and April. Winds are more variable and are marked by occasional shifts to SE and S between July and November, although winds still predominate. The West Caroline Islands, including the Republic of Palau,

10.1

and the Mariana Islands come under the influence of the monsoons and trades with NE winds in the northern winter and winds between E and SE in the summer. As these groups lie on the E margin of the monsoon belt, the Northeast Trades and the Northeast Monsoons merge and create winds averaging 12 to 14 knots in the open sea in the northern winter and early spring. In May, the winds over this section diminish in force and blow mostly from the NE; at this time, the Southwest Monsoon begins to be felt in the vicinity of the Republic of Palau.

10.1

In summer and early autumn, the Southwest Monsoon pre-

vails in the vicinity of and N of the Republic of Palau, but S winds predominate in the vicinity of the Admiralty Islands. In October and November, the NE winds become established over the whole area. Winds of 12 to 16 knots are experienced during the winter months.

10.1

In the Yap Islands area, NE to ENE winds prevail from

November to June, when the trades are reinforced in the cooler months by the Northeast Monsoon. The Southwest Monsoon occurs between July and October, but is less pronounced at Waleae and Lamotrek, where at that season the winds are fre- quently from the SE as from the SW.

In the Palau Islands area, the Northeast Monsoon is usually well established from December to April, though its appear-

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Pub. 126

10.1

Gales seldom occur in the East Caroline Islands. Gales occur

occasionally in the areas N of Palau and Guam, chiefly in win- ter, due to the strengthening of the Northeast Monsoon and the Northeast Trades. Sometimes, however, they occur at other seasons in connection with typhoons.

10.1

Regulations.—Regulations pertaining to navigation in U.S.

Territorial waters may be found in the NOS Coast Pilots, while additional regulations will be cited in the text along with the navigational feature they affect.

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Caution.—Large scale coverage for the waters included in

this sector are provided by both NOS and NGA. Mariners are advised to consult the most recent chart catalogs of both agencies, corrected to the latest Notice to Mariners for the pro- per chart selection and coverage of this region.

10.1

Micronesian authorities advise that local fishermen in small

canoes may be encountered in the following area within the Caroline Islands, as follows: a. 8°20'N, 147°00'E. b. 8°20'N, 148°00'E. c. 7°30'N, 148°00'E. d. 7°00'N, 147°00'E. e. 7°15'N, 146°00'E. f. 7°40'N, 145°35'E.

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Mariners should exercise prudence and caution when trans-

iting this above area, especially during darkness or periods of reduced visibility.

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Particular and constant attention must be paid to the currents

when navigating among the island groups. As a rule, these currents are deflected and always strengthened near the islands. Strong currents are found in the narrow passages. Many of the islands, which are encircled by reefs that are steep-to on the seaward side, are so low that it is often impossible to see them, except under favorable conditions of light.

The sea around the Truk Islands is reported to be of a pale green color, making it difficult to identify reefs.

10.1

Micronesia East of 148°E

10.2 Winds—Weather.—Kosrae Island, located on the S

margin of the NE trades, which dominate from December to April inclusive, is swept by NE winds of 10 to 15 knots. The Northeast Trades shift N in June and July and light variable winds and calms prevail until the SE trades become dominant. The winds during the latter period are less strong and constant than those of the Northeast Trades. In November and Decem-

ance is often advanced or delayed by as much as a month. The Southwest Monsoon occurs from the latter part of July to about the middle of October, but E winds often occur. The winds are variable during the remaining parts of the year.

10.1

In the Mariana Islands area, which lies near the border be-

tween the Asiatic Monsoon and the belt of the Northeast Trades, the steadiest winds, over the open sea, occur; then the winter monsoon and the Northeast Trades reinforce each other (November to April). Ninety per cent of all winds are then experienced from directions between N and SE and 70 per cent from NE to E. At the time of the summer monsoon, which falls into the season between May and October, E winds also pre- dominate, but with considerable percentages from S to W directions. Page 1  |  Page 2  |  Page 3  |  Page 4  |  Page 5  |  Page 6  |  Page 7  |  Page 8  |  Page 9  |  Page 10  |  Page 11  |  Page 12  |  Page 13  |  Page 14  |  Page 15  |  Page 16  |  Page 17  |  Page 18  |  Page 19  |  Page 20  |  Page 21  |  Page 22  |  Page 23  |  Page 24  |  Page 25  |  Page 26  |  Page 27  |  Page 28  |  Page 29  |  Page 30  |  Page 31  |  Page 32  |  Page 33  |  Page 34  |  Page 35  |  Page 36  |  Page 37  |  Page 38  |  Page 39  |  Page 40  |  Page 41  |  Page 42  |  Page 43  |  Page 44  |  Page 45  |  Page 46  |  Page 47  |  Page 48  |  Page 49  |  Page 50  |  Page 51  |  Page 52  |  Page 53  |  Page 54  |  Page 55  |  Page 56  |  Page 57  |  Page 58  |  Page 59  |  Page 60  |  Page 61  |  Page 62  |  Page 63  |  Page 64  |  Page 65  |  Page 66  |  Page 67  |  Page 68  |  Page 69  |  Page 70  |  Page 71  |  Page 72  |  Page 73  |  Page 74  |  Page 75  |  Page 76  |  Page 77  |  Page 78  |  Page 79  |  Page 80  |  Page 81  |  Page 82  |  Page 83  |  Page 84  |  Page 85  |  Page 86  |  Page 87  |  Page 88  |  Page 89  |  Page 90  |  Page 91  |  Page 92  |  Page 93  |  Page 94  |  Page 95  |  Page 96  |  Page 97  |  Page 98  |  Page 99  |  Page 100  |  Page 101  |  Page 102  |  Page 103  |  Page 104  |  Page 105  |  Page 106  |  Page 107  |  Page 108  |  Page 109  |  Page 110  |  Page 111  |  Page 112  |  Page 113  |  Page 114  |  Page 115  |  Page 116  |  Page 117  |  Page 118  |  Page 119  |  Page 120  |  Page 121  |  Page 122  |  Page 123  |  Page 124  |  Page 125  |  Page 126  |  Page 127  |  Page 128  |  Page 129  |  Page 130  |  Page 131  |  Page 132  |  Page 133  |  Page 134  |  Page 135  |  Page 136  |  Page 137  |  Page 138  |  Page 139  |  Page 140  |  Page 141  |  Page 142  |  Page 143  |  Page 144  |  Page 145  |  Page 146  |  Page 147  |  Page 148  |  Page 149  |  Page 150  |  Page 151  |  Page 152  |  Page 153  |  Page 154  |  Page 155  |  Page 156  |  Page 157  |  Page 158  |  Page 159  |  Page 160  |  Page 161  |  Page 162  |  Page 163  |  Page 164  |  Page 165  |  Page 166  |  Page 167  |  Page 168  |  Page 169  |  Page 170  |  Page 171  |  Page 172  |  Page 173  |  Page 174  |  Page 175  |  Page 176  |  Page 177  |  Page 178  |  Page 179  |  Page 180  |  Page 181  |  Page 182  |  Page 183  |  Page 184  |  Page 185  |  Page 186  |  Page 187  |  Page 188  |  Page 189  |  Page 190  |  Page 191  |  Page 192  |  Page 193  |  Page 194  |  Page 195  |  Page 196  |  Page 197  |  Page 198  |  Page 199  |  Page 200  |  Page 201  |  Page 202  |  Page 203  |  Page 204  |  Page 205  |  Page 206  |  Page 207  |  Page 208  |  Page 209  |  Page 210  |  Page 211  |  Page 212  |  Page 213  |  Page 214  |  Page 215  |  Page 216  |  Page 217  |  Page 218  |  Page 219  |  Page 220  |  Page 221  |  Page 222  |  Page 223  |  Page 224  |  Page 225  |  Page 226  |  Page 227  |  Page 228  |  Page 229  |  Page 230  |  Page 231  |  Page 232  |  Page 233  |  Page 234  |  Page 235  |  Page 236  |  Page 237  |  Page 238  |  Page 239  |  Page 240  |  Page 241  |  Page 242  |  Page 243  |  Page 244  |  Page 245  |  Page 246  |  Page 247  |  Page 248  |  Page 249  |  Page 250  |  Page 251  |  Page 252  |  Page 253  |  Page 254  |  Page 255  |  Page 256  |  Page 257  |  Page 258  |  Page 259  |  Page 260  |  Page 261  |  Page 262  |  Page 263  |  Page 264  |  Page 265  |  Page 266  |  Page 267  |  Page 268  |  Page 269  |  Page 270  |  Page 271  |  Page 272  |  Page 273  |  Page 274  |  Page 275  |  Page 276  |  Page 277  |  Page 278  |  Page 279  |  Page 280  |  Page 281  |  Page 282  |  Page 283  |  Page 284  |  Page 285  |  Page 286  |  Page 287  |  Page 288  |  Page 289  |  Page 290  |  Page 291  |  Page 292  |  Page 293  |  Page 294  |  Page 295  |  Page 296  |  Page 297  |  Page 298  |  Page 299  |  Page 300  |  Page 301  |  Page 302  |  Page 303  |  Page 304  |  Page 305  |  Page 306  |  Page 307  |  Page 308  |  Page 309  |  Page 310
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