Alert archive / Hawaii / High Surf Advisories in 2023
High Surf Advisory 21, NWS Honolulu, HI
NWS Honolulu, HI issued this high surf advisory at Jun 24, 2023, 3:45 AM HST for 4 counties in Hawaii. It was in force for 35 hr.
The area
The counties it named.
The facts
- Issued
- Jun 24, 2023, 3:45 AM HST (13:45 UTC)
- Expired
- Jun 25, 2023, 3:04 PM HST
- In force
- 35 hr
- Issued by
- NWS Honolulu, HI
Counties Hawaii County, HI, Honolulu County, HI, Kalawao County, HI, Kauai County, HI
The radar
The Molokai radar (PHMO), 38 km from the middle of the area, began a volume at 13:46 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
The nearest sounding before it
Lihue, (PHLI), launched 12:00Z, 1.8 hours before the alert went out and 214 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 108 J/kg
- Mixed-layer CIN
- 0 J/kg
- Mixed-layer LCL
- 712 m above ground
- 0-6 km bulk shear
- 20 kt
- 0-1 km storm-relative helicity
- -65 m²/s²
- 0-3 km storm-relative helicity
- -40 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
282 WHHW40 PHFO 241345 CFWHFO Coastal Hazard Message National Weather Service Honolulu HI 345 AM HST Sat Jun 24 2023 ...HIGH SURF ADVISORY FOR SOUTH FACING SHORES OF ALL THE HAWAIIAN ISLANDS... .A long period south swell (170 degrees) will fill in today, peak tonight and hold into tomorrow that will elevate surf along south facing shores. A second pulse arriving Monday could keep surf elevated through early next week. HIZ001-003-006-016-018-023-031>034-038-041-043-044-046-049>052- 250245- /O.NEW.PHFO.SU.Y.0021.230624T1345Z-230626T1600Z/ Niihau-Kauai Southwest-Waianae Coast-Kahoolawe-Maui Leeward West- Kona-Kauai South-East Honolulu-Honolulu Metro-Ewa Plain- Molokai Southeast-Molokai Leeward South-Lanai Leeward-Lanai South- Maui Central Valley South-South Maui/Upcountry-South Haleakala- Big Island South-Big Island Southeast- 345 AM HST Sat Jun 24 2023 ...HIGH SURF ADVISORY IN EFFECT UNTIL 6 AM HST MONDAY... * WHAT...Surf building to 7 to 10 feet. * WHERE...South facing shores of all islands. * WHEN...Until 6 AM HST Monday. * IMPACTS...Moderate. Strong breaking waves and strong currents will make swimming dangerous. PRECAUTIONARY/PREPAREDNESS ACTIONS... Head all advice from ocean safety officials. When in doubt, don't go out. && $$
4 follow-up statements
465 WHHW40 PHFO 242111 CFWHFO Coastal Hazard Message National Weather Service Honolulu HI 1111 AM HST Sat Jun 24 2023 ...HIGH SURF ADVISORY FOR SOUTH FACING SHORES OF ALL ISLANDS... .A building long-period south-southeast swell (160 degrees) will peak tonight and tomorrow, then briefly diminish. A second pulse arriving Monday could keep surf elevated through early next week. HIZ001-003-006-016-018-023-031>034-038-041-043-044-046-049>052- 250230- /O.CON.PHFO.SU.Y.0021.000000T0000Z-230626T1600Z/ Niihau-Kauai Southwest-Waianae Coast-Kahoolawe-Maui Leeward West- Kona-Kauai South-East Honolulu-Honolulu Metro-Ewa Plain- Molokai Southeast-Molokai Leeward South-Lanai Leeward-Lanai South- Maui Central Valley South-South Maui/Upcountry-South Haleakala- Big Island South-Big Island Southeast- 1111 AM HST Sat Jun 24 2023 ...HIGH SURF ADVISORY REMAINS IN EFFECT UNTIL 6 AM HST MONDAY... * WHAT...Surf 8 to 12 feet. * WHERE...South facing shores of all islands. * WHEN...Until 6 AM HST Monday. * IMPACTS...Moderate. Strong breaking waves and strong currents will make swimming dangerous. PRECAUTIONARY/PREPAREDNESS ACTIONS... Head all advice from ocean safety officials. When in doubt, don't go out. Know your limits. && $$ Birchard
219 WHHW40 PHFO 250118 CFWHFO Coastal Hazard Message National Weather Service Honolulu HI 318 PM HST Sat Jun 24 2023 ...HIGH SURF ADVISORY FOR SOUTH FACING SHORES OF ALL ISLANDS... .A long-period south-southeast swell (160 degrees) will peak tonight and tomorrow, then briefly diminish. A second pulse arriving Monday could keep surf elevated through early next week. HIZ001-003-006-016-018-023-031>034-038-041-043-044-046-049>052- 251430- /O.CON.PHFO.SU.Y.0021.000000T0000Z-230626T1600Z/ Niihau-Kauai Southwest-Waianae Coast-Kahoolawe-Maui Leeward West- Kona-Kauai South-East Honolulu-Honolulu Metro-Ewa Plain- Molokai Southeast-Molokai Leeward South-Lanai Leeward-Lanai South- Maui Central Valley South-South Maui/Upcountry-South Haleakala- Big Island South-Big Island Southeast- 318 PM HST Sat Jun 24 2023 ...HIGH SURF ADVISORY REMAINS IN EFFECT UNTIL 6 AM HST MONDAY... * WHAT...Surf 8 to 12 feet. * WHERE...South facing shores of all islands. * WHEN...Until 6 AM HST Monday. * IMPACTS...Moderate. Strong breaking waves and strong currents will make swimming and boating dangerous. PRECAUTIONARY/PREPAREDNESS ACTIONS... Head all advice from ocean safety officials. When in doubt, don't go out. Know your limits. && $$ Birchard
333 WHHW40 PHFO 251303 CFWHFO Coastal Hazard Message National Weather Service Honolulu HI 303 AM HST Sun Jun 25 2023 ...HIGH SURF ADVISORY FOR SOUTH FACING SHORES OF ALL ISLANDS... .A long-period south-southeast swell (170 degrees) will peak today, then briefly diminish. A second pulse arriving Monday could keep surf elevated through early next week. HIZ001-003-006-016-018-023-031>034-038-041-043-044-046-049>052- 260215- /O.CON.PHFO.SU.Y.0021.000000T0000Z-230626T1600Z/ Niihau-Kauai Southwest-Waianae Coast-Kahoolawe-Maui Leeward West- Kona-Kauai South-East Honolulu-Honolulu Metro-Ewa Plain- Molokai Southeast-Molokai Leeward South-Lanai Leeward-Lanai South- Maui Central Valley South-South Maui/Upcountry-South Haleakala- Big Island South-Big Island Southeast- 303 AM HST Sun Jun 25 2023 ...HIGH SURF ADVISORY REMAINS IN EFFECT UNTIL 6 AM HST MONDAY... * WHAT...Surf 8 to 12 feet. * WHERE...South facing shores of all islands. * WHEN...Until 6 AM HST Monday. * IMPACTS...Moderate. Strong breaking waves and strong currents will make swimming dangerous. PRECAUTIONARY/PREPAREDNESS ACTIONS... Head all advice from ocean safety officials. When in doubt, don't go out. && $$
503 WHHW40 PHFO 260104 CFWHFO Coastal Hazard Message National Weather Service Honolulu HI 304 PM HST Sun Jun 25 2023 ...HIGH SURF ADVISORY CANCELLED FOR SOUTH FACING SHORES OF ALL ISLANDS... HIZ001-003-006-016-018-023-031>034-038-041-043-044-046-049>052- 260215- /O.CAN.PHFO.SU.Y.0021.000000T0000Z-230626T1600Z/ Niihau-Kauai Southwest-Waianae Coast-Kahoolawe-Maui Leeward West- Kona-Kauai South-East Honolulu-Honolulu Metro-Ewa Plain- Molokai Southeast-Molokai Leeward South-Lanai Leeward-Lanai South- Maui Central Valley South-South Maui/Upcountry-South Haleakala- Big Island South-Big Island Southeast- 304 PM HST Sun Jun 25 2023 ...HIGH SURF ADVISORY IS CANCELLED... Although still elevated, surf along south facing shores has fallen below advisory thresholds. A fresh pulse of south-southeast swell is expected late Monday into Tuesday, potentially producing surf heights near advisory levels once again. If so, a new high Surf Advisory will be issued. $$ Birchard
What forecasters said that day
The local office's own words before this high surf advisory went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Honolulu, HI wrote its last area forecast discussion before this high surf advisory went out at Jun 24, 3:26 AM HST, 19 minutes earlier.
Area forecast discussion, Jun 24, 3:26 AM HST, 19 minutes before
Area Forecast Discussion National Weather Service Honolulu HI 326 AM HST Sat Jun 24 2023 .SYNOPSIS... Trade winds will remain at breezy to locally windy levels through early next week, peaking this weekend. The trades are expected to ease slightly during the middle to latter part of next week. Little change in the overall weather pattern is expected during the next 7 days, with bands of clouds and showers moving through the islands at times. Showers will favor windward and mauka areas, particularly at night and during the early morning hours, with a few showers occasionally reaching leeward communities due to the strength of the trades. && .DISCUSSION... Currently at the surface, a 1028 mb high is centered around 850 miles north-northeast of Honolulu, and is driving breezy trade winds across the island chain early this morning. Infrared satellite imagery shows partly to mostly cloudy conditions across the state, with cloud coverage the highest in windward and mauka areas as well as leeward sections of the Big Island. Radar imagery shows scattered to numerous showers moving into windward areas, with some of these showers reaching leeward communities at times. Main short term focus revolves around rain chances during the next few days. High pressure will remain nearly stationary to the north of the islands through Tuesday, keeping breezy trade winds in place across the island chain. The trade winds will peak at locally windy levels this weekend as a drier more stable airmass builds in and lowers inversion heights to around 5-6 kft. This should allow the terrain to be particularly effective at accelerating the winds through the islands. A a result, a Wind Advisory has been issued for portions of the Big Island, Maui, Lanai and Kahoolawe from 10 am this morning through 6 pm Sunday. The trades are expected to ease back to moderate and locally breezy levels Wednesday through late next week as the high to the distant north weakens slightly. As for the remaining weather details, typical trade wind weather is expected to continue during the next 7 days, with the exception of this weekend, when a drier more stable airmass should reduce shower coverage statewide. Overall, bands of clouds and showers will periodically move through the islands throughout the forecast period, with showers favoring windward slopes and coasts, particularly at night and during the early morning hours. A few showers will reach leeward areas at times as well due to the strength of the trades. && .AVIATION... Breezy to locally strong trade winds will continue through the weekend. As a result, AIRMET Tango will remain posted for low level turbulence over and downwind of the terrain of all islands. Low clouds and showers will continue to favor windward and mauka areas, with a few showers spilling over into leeward areas due to the strong trades. Expect mainly VFR conditions across the area, with periods of MVFR cigs and vsbys under SHRA. AIRMET Sierra for mountain obscuration over windward sections of Oahu and the Big Island will remain posted through the morning hours. && .MARINE... Small Craft Advisory level easterly trade winds (20-30 kt) and associated rough seas are expected to continue through early next week. Seas will reach the 8 to 12 ft range this weekend due to a combination of a solid long-period south-southeast swell and the short-period wind generated seas out of the east. Winds are forecast to increase to near-Gale speeds today, mainly over the Alenuihaha Channel. Latest ASCAT shows a solid area of strong winds in this zone, thus will continue the Gale Watch, but this may need to be upgraded to a Gale Warning later today. Near shore buoys are already seeing an increasing in south swell energy as the new south (170 degree) swell fills in. This swell will continue to build today, peak tonight and hold through Sunday. A High Surf Advisory has been issued for south facing shores as surf builds to advisory levels (10 ft) today. A second pulse is expected to arrive Monday, keeping surf well above average through the first half of next week. Surf will return to the summertime average late next week with more typical background southerly energy moving through. Surf along east facing shores will trend up and remain rough through early next week due to the strong to near gale force trades trades. Surf along north and west facing shores will remain near the summertime average through today, then slightly rise Sunday into next week as a small northwest swell arrives. && .HFO WATCHES/WARNINGS/ADVISORIES... High Surf Advisory until 6 AM HST Monday for Niihau-Kauai Leeward-Waianae Coast-Kahoolawe-Maui Leeward West-Kona-Kauai South-East Honolulu-Honolulu Metro-Ewa Plain-Molokai Southeast- Molokai Leeward South-Lanai Leeward-Lanai South-Maui Central Valley South-South Maui/Upcountry-South Haleakala-Big Island South-Big Island Southeast. Wind Advisory from 10 AM this morning to 6 PM HST Sunday for Lanai Mauka-Kahoolawe-Maui Windward West-Maui Leeward West- Kohala-Lanai Windward-Lanai Leeward-Maui Central Valley North- Maui Central Valley South-South Haleakala-Big Island North. Small Craft Advisory until 6 PM HST Monday for Kauai Northwest Waters-Kauai Windward Waters-Kauai Leeward Waters-Kauai Channel- Oahu Windward Waters-Oahu Leeward Waters-Kaiwi Channel-Maui County Windward Waters-Maui County Leeward Waters-Maalaea Bay- Pailolo Channel-Big Island Windward Waters-Big Island Leeward Waters-Big Island Southeast Waters. Small Craft Advisory until 8 PM HST this evening for Alenuihaha Channel. Gale Watch from this evening through late Sunday night for Alenuihaha Channel. && DISCUSSION...Jelsema AVIATION...Ahue MARINE...Almanza
The office that day
Everything else NWS Honolulu, HI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 23, 3:25 PM HST | Gale Watch | HFO | 24 hr | |
| Jun 24, 3:01 AM HST | Wind Advisory | HFO | Hawaii, Kalawao | 36 hr |
Nearby
High Surf Advisories in Hawaii, 2023Every high surf advisory in 2023
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.