| Current Conditions | ||
| Temp |  | 3.3 C |
| RH | | 79 % |
| Wind | | ESE 9 mph |
| Road | | Closed |
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Hawaiian Islands Synoptic Discussion and Guidance 619 FXHW60 PHFO 210152 AFDHFO Area Forecast Discussion National Weather Service Honolulu HI 352 PM HST Tue Aug 20 2019 .SYNOPSIS... A surface ridge north of the area will maintain locally breezy trade winds over the islands. && .DISCUSSION... The 2 PM surface analysis shows a surface ridge extending from a high far northeast of the area near 30N133W and another high about 700 miles northwest of the area near 31N164W. 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 Maui. These showers will clear the islands this evening. 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... A ridge north of the state will help to maintain moderate easterly trade flow overnight. Isolated showers, mainly concentrated along windward areas and over elevated terrain, will become scattered after sun down. Expect MVFR conditions at times tonight due to 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 typically windy waters around Maui County and the Big Island. Data from the PacIOOS buoys show the new long period south swell continues to build. Advisory level surf can be expected through Wednesday night. This swell will hold steady 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 through 6 AM Thursday for south facing shores of all islands. Small Craft Advisory through 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 |
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