| Current Conditions | ||
| Temp |  | 9.1 C |
| RH | | 48 % |
| Wind | | ESE 14 mph |
| Road | | Closed |
|
Menu of Text Products for the Hawaiian Islands and the Tropical Pacific/Atlantic Oceans: |
|
Narrow the Menu List Select Time Limit: 12 hours | 24 hours | 48 hours | 72 hours | No time limit Select Product Type: All | Routine Bulletins/FCSTS | Warnings/Watches/Advisories | HAWN Weather | Tropical | Marine | Aviation | Daily Obs | Special |
|
|
Hawaiian Islands Synoptic Discussion and Guidance 599 FXHW60 PHFO 202010 AFDHFO Area Forecast Discussion National Weather Service Honolulu HI 1010 AM HST Tue Aug 20 2019 .SYNOPSIS... A surface ridge will remain north of the area. A weak trough south of the Big Island will move west and weaken through this evening. A front north of the islands will move south through Thursday, then move away to the west. High pressure will build north of the area over the weekend. && .DISCUSSION... The 8 AM surface analysis shows a surface ridge extending from a high far northeast of the area near 31N130W and another high about 600 miles northwest of the area near 30N163W. A weak trough south of the Big Island is moving west around 10 miles an hour and weakening. The ridge north of the islands will maintain easterly trade winds across the area. A poorly organized area of showery low clouds associated with the trough south of the Big Island has been moving over the islands. Most of the showers have moved off to the west of the islands, but some showers remain upstream of the Big Island and Kauai. These showers will clear the islands this afternoon. Trade winds will strengthen a bit through tomorrow as the high builds northwest of the islands. A front about 1000 miles north of the islands will move south through Thursday and cause the trades to weaken. On Friday, the front will move off to the west and the high will build northeast. Trade winds will strengthen again and become locally breezy over the weekend. && .AVIATION... An elongated surface high to the north of the state will help to maintain moderate easterly trade flow through this afternoon. Isolated showers, mainly concentrated along windward areas and over elevated terrain, will become scattered after sundown this evening. Expect MVFR conditions at times tonight from low clouds and SHRA. No AIRMETs are currently in effect. && .MARINE... High pressure will strengthen north of the area providing an uptick in trade winds speeds. Small Craft Advisory conditions are expected beginning tonight over the windy waters around Maui County and the Big Island. Data from the PacIOOS buoys show a new long period south swell continues to build. Surf along south facing shores will continue to rise today with heights expected to reach High Surf Advisory levels. This swell will hold solid through Wednesday then lower gradually Thursday and Friday. A series of smaller long period southerly swells are expected early next week. A small west to northwest swell will linger over the next few days providing some out of season surf along exposed shorelines. Strengthening trade winds over the next several days will cause short period choppy surf to increase along east facing shores through the remainder of the week and on through the weekend. && .HFO WATCHES/WARNINGS/ADVISORIES... High Surf Advisory from midnight tonight to 6 AM Thursday for south facing shores of all islands. Small Craft Advisory from 6 PM this evening to 6 PM Thursday for Maalaea Bay, the Pailolo and Alenuihaha Channels and waters south of the Big Island. && $$ DISCUSSION...Donaldson AVIATION...Thomas MARINE...Burke Bulletins, Forecasts and Observations are courtesy of Honolulu National Weather Service Forecast Office |
|