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Menu of Text Products for the Hawaiian Islands and the Tropical Pacific/Atlantic Oceans: Select a text product: Hawaiian Islands Synoptic Discussion and Guidance Hawaiian Islands Short Term Forecast Hawaiian Islands 7-day Zone Forecast Hydrologic Outlook Flash Flood Warning Flash Flood Watch Flash Flood Statement Tornado Warning Severe Weather Statement Severe Thunderstorm Warning Special Weather Statement Winter Storm Warnings/Watches/Advisories Urgent Weather Message Marine Weather Statement/High Surf Advisory/Warning Special Marine Warning Radar Message Special Messages Unknown Terminal Aerodome Foreasts (TAFS) Area Forecast for Hawaii and Adjacent Coastal Waters Upper-level Winds and Temperature Forecast for the 4 Major Hawaii AP AIRMETs for IFR Conditions, Turbulence, and Icing Thunderstorm SIGMETs Hawaiian Islands Satellite Interpetation Message Central/North Pacific Tropical Weather Outlook Central/North Pacific Tropical Weather Summary Central Pacific Tropical Cyclone Summary South Pacific Tropical Cyclone Summary Tropical Cyclone SIGMETs Buoy Winds and Wave Forecast Oahu Surf Observation and Forecast/Coastal Forecast for Hawaiian Waters Offshore Forecast for Hawaiian Waters North Pacific High Seas Forecast South Pacific High Seas Forecast Hawaiian Islands Automated Surface Observation System Hourly Weather Roundup Hawaiian Islands Wind Data Hawaiian Islands Rainfall Summary Hawaii Temperature and Precipitation Summary Daily Hawaii Cooperative Observations Honolulu AP Climate Summary Lihue AP Climate Summary Kahului AP Climate Summary Hilo AP Climate Summary Atlantic Tropical Cyclone Discussion Atlantic Tropical Weather Outlook East Pacific Tropical Cyclone Discussion East Pacific Tropical Weather Outlook Central Pacific Tropical Cyclone Discussion Central Pacific Tropical Weather Outlook West Pacific Tropical Cyclone Discussion West Pacific Tropical Weather Outlook

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Hawaiian Islands Synoptic Discussion and Guidance 013 FXHW60 PHFO 261936 AFDHFO Area Forecast Discussion National Weather Service Honolulu HI 936 AM HST Tue May 26 2020 .SYNOPSIS... Light winds today will strengthen tonight and Wednesday, with moderate to occasionally breezy trade winds continuing through next weekend. The trade winds will focus low clouds and showers over windward areas, but today's light winds will also allow a few showers to develop over leeward areas in the afternoon. Varying amounts of benign high clouds are expected to move over the islands through Friday. && .DISCUSSION... Little change to the forecast this morning. Did increase the sky cover through tonight to take into account the high clouds moving overhead from the south. Not expecting any significant change to the forecast today. A ridge to the north of the islands is expected to lift the north, allowing trade winds to filter back into the region from south to north tonight and Wednesday. A new high building in north of the islands will help to increase our trades to moderate levels through the weekend. Meanwhile, an upper level low to the southwest of the islands is ushering in some high clouds from the south, and those clouds are impacting the eastern half of the state this morning. The upper level low is expected to gradually move to the west, which will spread the high clouds to the other islands over the next day or so. The high clouds will linger through Friday, before thinning and exiting the area to the west. With the returning trade winds, expect showers to be focused over the windward sides of the islands. Today we could still see some development over leeward and interior areas this afternoon with the light winds. There are indications in the long range models that we could see an increase in trade wind shower activity early next week. && .AVIATION... Expect late morning/afternoon sea breezes to develop with light winds still in place with possibly a few inland showers. That should change beginning later today and tonight as the high builds and strengthens to the northeast, increasing the wind speeds. That trend should continue for the next few days. This means that any showers that develop will favor windward mauka areas with passing MVFR conditions in those areas as well, especially overnight and into the early morning hours. VFR conditions are to be expected elsewhere. Low clouds and a few lights showers still have lower clouds across north through southeast sections of Oahu so will maintain AIRMET Sierra for mountain obscuration in those areas. && .MARINE... Light to moderate east-southeast winds will hold today over the western end of the state, which will allow land and sea breezes to develop near the coasts. Farther east over Maui County and the Big Island, moderate to fresh trade winds will return. By Wednesday afternoon, fresh to locally strong trade winds are expected across the state as a ridge high of high pressure strengthens north of the state. Winds may reach Small Craft Advisory levels across the typically windy waters around the Big Island and Maui Wednesday into the weekend. Surf along north facing shores will gradually trend down today as the small, medium-period, north-northwest swell fades. An upward trend is expected Wednesday through the second half of the week due to a storm-force low that has developed around 1000 nautical miles north-northwest of the state. This swell will shift around out of the north late Thursday through Saturday as the source passes to the north today. Surf along south facing shores will remain small into midweek with mainly a combo of south-southwest and south-southeast energy moving through. An upward trend is possible by Thursday night as a new, long- period, south-southwest swell arrives. This will hold through Friday, then gradually trend down over the weekend. For the extended, a strong low pressure system currently developing southeast of New Zealand could produce a moderate south swell by early next week. Latest WW3 guidance is suggesting surf picking up Monday and peaking around the middle of next week along south facing shores. Surf along east facing shores will remain below the May average through the weekend due to the lack of strong trades upstream of the state. && .HFO WATCHES/WARNINGS/ADVISORIES... None. && $$ DISCUSSION...M Ballard AVIATION...Chevalier MARINE...Kino Bulletins, Forecasts and Observations are courtesy of Honolulu National Weather Service Forecast Office

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