Marine Weather for HS 005

High Seas Forecast National Weather Service Honolulu HI 1700 UTC Mon Oct 21 2019

Superseded by next issuance in 6 hours

Seas given as significant wave height...which is the average height of the highest 1/3 of the waves. Individual waves may be more than twice the significant wave height.

This High Seas Forecast uses 1-minute average winds which may be higher than 10-minute average winds.


North Pacific Equator to 30n between 140w and 160e

Synopsis valid 1200 UTC Oct 21 2019. 24 hour forecast valid 1200 UTC Oct 22 2019. 48 hour forecast valid 1200 UTC Oct 23 2019.



.Synopsis and forecast.

.stationary front from 30n166w to 26n174w to 24n178e. .24 hour forecast front dissipated.

.trough from 30n162w to 25n168w to 21n177w to 17n176e moving NW slowly. Isolated moderate tstms within 210 nm of trough between 179e and 168w. .24 hour forecast trough from 25n172w to 21n178w to 16n175e. .48 hour forecast trough from dissipating trough from 30n167w to 25n171w to 22n180w.

.Trough from 22n161w to 18n163w to 16n167w moving W 10 kt. Scattered to numerous moderate tstms from 14n to 21n between 159w and 165w. .24 hour forecast trough merged with trough described directly above.

.NE to E winds 20 to 25 kt from 15n to 18n E of 149w. .24 hour forecast NE to E winds 20 to 25 kt from 13n to 20n E of 155w. .48 hour forecast associated winds diminished to 20 kt or less.

.24 hour forecast new low 10n143w 1007 mb. NE to E winds 20 to 30 kt within 210 nm N semicircle of low. .48 hour forecast low 10n147w 1007 mb. NE to E winds 20 to 25 kt within 240 nm N semicircle of low.

.12 hour forecast new cold front from 30n171e to 29n162e. .24 hour forecast cold front from 30n178w to 27n173e to 28n162e. .48 hour forecast dissipating cold front from 30n171w to 26n178e to 23n167e. NE to E winds 20 to 25 kt N of 27n between 174w and 168e.

.Ridge from 30n146w to 26n163w moving N 10 kt.

.ridge from 30n180w to 26n166e moving E 20 kt and eroding from the W.

.Ridge from 28n160e to 27n176e nearly stationary.

.seas 8 to 10 ft from 14n to 21n E of 147w. .24 hour forecast seas 8 to 10 ft N of 28n W of 180w. Seas 8 to 9 ft from 11n to 19n E of 152w. .48 hour forecast seas 8 to 11 ft N of 26n between 172w and 165e.

.remainder of area winds 20 kt or less. Seas 8 ft or less.

.ITCZ from 09n140w to 07n148w to 09n156w to 06n172w to 07n174e. Scattered moderate tstms within 240 nm of ITCZ between 151w and 174w.


.Forecaster birchard. Honolulu HI.

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