| Current Conditions | ||
| Temp |  | 2.4 C |
| RH | | 17 % |
| Wind | | NE 17 mph |
| Road | | Open (4x4) |
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Hawaiian Islands Synoptic Discussion and Guidance 735 FXHW60 PHFO 250203 AFDHFO Area Forecast Discussion National Weather Service Honolulu HI 403 PM HST Sun Jun 24 2018 .SYNOPSIS... A strong high will remain far northeast of the area and a trough aloft will linger near the area through the week. && .DISCUSSION... Satellite loops and surface observations show locally breezy easterly trade winds blowing over the islands. Scattered to broken low clouds are riding in with the trade winds. Skies are mostly cloudy over windward areas with partly cloudy skies over lower lee areas of the smaller islands. Broken to overcast low clouds cover most of the Big Island of Hawaii with isolated to scattered clouds over leeward Kohala and over the interior above about 8000 feet of elevation. Radars show scattered to numerous showers moving over windward areas from the east. Surface analyses show fairly strong 1033 mb surface high about 1300 miles north of the main Hawaiian Islands. The high will move east through tomorrow night, shift southwest Tuesday through Wednesday night, then move north again into the weekend. The pressure gradient southwest of this high will maintain breezy trade winds over the islands through most of the week. An area of showery low clouds that has been moving over the islands has partly broken up and is starting to move away to the west. There will still be showers moving over the islands in the trade-wind flow, but the weather will turn drier tonight and Monday. Another area of showers east of the islands will move over the area Monday night through Tuesday morning. Water vapor satellite loops show a low aloft about 650 miles northeast of the main Hawaiian islands with a trough extending west southwest from the low. This trough, a common summertime feature sometimes called a TUTT or tropical upper tropospheric trough, is forecast to linger north of the islands. The trough will help make the low clouds moving over this islands rather showery at times. Trade winds will continue to push emissions from Halemaumau crater and the East Rift Zone of Kilauea Volcano southwest across the Kau District. Eddies west of the Big Island will push some of the vog over the Kona area. The emissions will move off to the west southwest well south of the smaller islands through at least Friday. $$ .AVIATION... Breezy, occasionally strong, trade winds will persist as a ridge of high pressure remains northeast of the state. AIRMET Tango remains in effect for low level turbulence over mountains and leeward sections of all islands due to the breezy trades. AIRMET Tango may continue over the next couple of days due to the persistent wind speeds. VFR conditions will prevail with passing low clouds and showers bringing MVFR conditions to windward and mauka sections. AIRMET Sierra is in effect for tempo mountain obscurations this evening for windward sections of Kauai, Oahu and the Big Island. AIRMET Sierra may be extended into tonight for some windward sections. && .MARINE... Fresh to strong trades associated with high pressure to the north will continue through the week. A Small Craft Advisory remains in effect for the windy areas around Maui and the Big Island through Tuesday night. Surf along east facing shores will remain rough due to these winds. Surf will build along south facing shores this week as swells arrive from the south Pacific. The first swell build Tuesday and the second swell will arrive Wednesday. Surf may reach advisory levels along south facing shores by Thursday. A recent ASCAT pass showed a gale-force low passing just south of the Tasman Sea. The WAVEWATCH III shows a swell from this low reaching reaching Hawaiian waters early next week, but swells from Tasman Sea are partly blocked on their way to Hawaiian waters. && .HFO WATCHES/WARNINGS/ADVISORIES... Small Craft Advisory until 6 AM Wednesday for Maalaea Bay, the Pailolo and Alenuihaha Channels and waters south of the Big Island. && $$ DISCUSSION...Donaldson AVIATION...Foster MARINE...TS Bulletins, Forecasts and Observations are courtesy of Honolulu National Weather Service Forecast Office |
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