Alert archive / Hawaii / High Surf Advisories in 2021
High Surf Advisory 2, NWS Honolulu, HI
NWS Honolulu, HI issued this high surf advisory at Jan 4, 2021, 4:37 AM HST for Honolulu County, Kauai County, Kalawao County, Hawaii. It was in force for 4 days.
The area
The counties it named.
The facts
- Issued
- Jan 4, 2021, 4:37 AM HST (14:37 UTC)
- Expired
- Jan 8, 2021, 3:22 PM HST
- In force
- 4 days
- Issued by
- NWS Honolulu, HI
Counties Honolulu County, HI, Kalawao County, HI, Kauai County, HI
The radar
The Molokai radar (PHMO), 116 km from the middle of the area, began a volume at 14:40 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, 2.6 hours before the alert went out and 127 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
- 82 J/kg
- Mixed-layer CIN
- -2 J/kg
- Mixed-layer LCL
- 795 m above ground
- 0-6 km bulk shear
- 16 kt
- 0-1 km storm-relative helicity
- -13 m²/s²
- 0-3 km storm-relative helicity
- -16 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
783 WHHW40 PHFO 041437 CCA CFWHFO Coastal Hazard Message...CORRECTED National Weather Service Honolulu HI 437 AM HST Mon Jan 4 2021 ...HIGH SURF ADVISORY FOR NORTH AND WEST FACING SHORES OF NIIHAU KAUAI OAHU MOLOKAI AND NORTH FACING SHORES OF MAUI... .A northwest swell will produce advisory level surf across exposed shores of most of the smaller islands through Tuesday afternoon. This advisory may need to be extended later this week as additional northwest swells arrive. HIZ001>003-006>008-012-013-017-019-020-050245- /O.NEW.PHFO.SU.Y.0002.210104T1437Z-210106T0400Z/ Niihau-Kauai Windward-Kauai Leeward-Waianae Coast- Oahu North Shore-Oahu Koolau-Molokai Windward-Molokai Leeward- Maui Windward West-Maui Central Valley-Windward Haleakala- 437 AM HST Mon Jan 4 2021 ...HIGH SURF ADVISORY IN EFFECT UNTIL 6 PM HST TUESDAY... * WHAT...Surf of 14 to 18 feet along the north facing shores of Niihau, Kauai, Oahu, Molokai, and Maui; and 10 to 14 feet along the west facing shores of Niihau, Kauai, Oahu, and Molokai. * WHERE...North and west facing shores of Niihau, Kauai, Oahu, Molokai, and north facing shores of Maui. * WHEN...Until 6 PM HST Tuesday. * IMPACTS...Moderate. Expect strong breaking waves, shore break, and strong longshore and rip currents making swimming difficult and dangerous. PRECAUTIONARY/PREPAREDNESS ACTIONS... Beachgoers, swimmers, and surfers should heed all advice given by ocean safety officials and exercise caution. Boaters should expect recreational surfers and body boarders utilizing harbor channels to access surfing areas. && $$
10 follow-up statements
170 WHHW40 PHFO 050209 CFWHFO Coastal Hazard Message National Weather Service Honolulu HI 409 PM HST Mon Jan 4 2021 ...HIGH SURF ADVISORY FOR NORTH AND WEST FACING SHORES OF NIIHAU KAUAI OAHU MOLOKAI AND NORTH FACING SHORES OF MAUI... .A large northwest swell is producing advisory level surf across the most northern and western exposed shores of the smaller islands through Wednesday morning. This advisory may need to be extended or upgraded to a surf warning later in the week as additional large northwest swells pass through the islands. HIZ001>003-006>008-012-013-017-019-020-051515- /O.EXT.PHFO.SU.Y.0002.000000T0000Z-210106T1600Z/ Niihau-Kauai Windward-Kauai Leeward-Waianae Coast- Oahu North Shore-Oahu Koolau-Molokai Windward-Molokai Leeward- Maui Windward West-Maui Central Valley-Windward Haleakala- 409 PM HST Mon Jan 4 2021 ...HIGH SURF ADVISORY NOW IN EFFECT UNTIL 6 AM HST WEDNESDAY... * WHAT...Surf ranging 16 to 24 feet along the north-facing shores of Niihau, Kauai, Oahu, Molokai and Maui; and 9 to 16 feet along the west-facing shores of Niihau, Kauai, Oahu and Molokai. * WHERE...North and west facing shores of Niihau, Kauai, Oahu, Molokai and north facing shores of Maui. * WHEN...Until 6 AM HST Wednesday. * IMPACTS...Moderate to High. Expect strong breaking waves, shore break, and strong longshore and rip currents making swimming difficult and dangerous. PRECAUTIONARY/PREPAREDNESS ACTIONS... Beachgoers, swimmers, and surfers should heed all advice given by ocean safety officials and exercise caution. && $$
858 WHHW40 PHFO 051329 CFWHFO Coastal Hazard Message National Weather Service Honolulu HI 329 AM HST Tue Jan 5 2021 ...HIGH SURF ADVISORY FOR NORTH AND WEST FACING SHORES OF NIIHAU KAUAI OAHU MOLOKAI AND NORTH FACING SHORES OF MAUI... .Advisory-level surf will continue through the day today along exposed north and west facing shores of the smaller islands. Surf may briefly lower below advisory levels tonight as the swell eases. HIZ001>003-006>008-012-013-017-019-020-060230- /O.EXT.PHFO.SU.Y.0002.000000T0000Z-210106T0400Z/ Niihau-Kauai Windward-Kauai Leeward-Waianae Coast- Oahu North Shore-Oahu Koolau-Molokai Windward-Molokai Leeward- Maui Windward West-Maui Central Valley-Windward Haleakala- 329 AM HST Tue Jan 5 2021 ...HIGH SURF ADVISORY NOW IN EFFECT UNTIL 6 PM HST THIS EVENING... * WHAT...Surf of 12 to 16 feet this morning lowering to 10 to 15 feet this afternoon along the north facing shores of Niihau, Kauai, Oahu, Molokai, and Maui; and 8 to 12 feet along the west facing shores of Niihau, Kauai, Oahu, and Molokai. * WHERE...North and west facing shores of Niihau, Kauai, Oahu, Molokai and north facing shores of Maui. * WHEN...Until 6 PM HST this evening. * IMPACTS...Moderate. Expect strong breaking waves, shore break, and strong longshore and rip currents making swimming difficult and dangerous. PRECAUTIONARY/PREPAREDNESS ACTIONS... Beachgoers, swimmers, and surfers should heed all advice given by ocean safety officials and exercise caution. && $$ Gibbs/Bohlin
743 WHHW40 PHFO 060130 CFWHFO Coastal Hazard Message National Weather Service Honolulu HI 330 PM HST Tue Jan 5 2021 ...HIGH SURF ADVISORY FOR NORTH AND WEST FACING SHORES OF NIIHAU KAUAI OAHU MOLOKAI AND NORTH FACING SHORES OF MAUI... .Surf will briefly decline below advisory levels this evening, then rebuild late tonight and Wednesday. North and west shore surf will peak well above advisory levels Wednesday night and Thursday, then decline Thursday night and Friday. HIZ001>003-006>008-012-013-017-019-020-061430- /O.EXT.PHFO.SU.Y.0002.000000T0000Z-210108T0400Z/ Niihau-Kauai Windward-Kauai Leeward-Waianae Coast- Oahu North Shore-Oahu Koolau-Molokai Windward-Molokai Leeward- Maui Windward West-Maui Central Valley-Windward Haleakala- 330 PM HST Tue Jan 5 2021 ...HIGH SURF ADVISORY NOW IN EFFECT UNTIL 6 PM HST THURSDAY... * WHAT...After a decline this evening, surf will build on Wednesday to 14 to 18 feet along north facing shores of Niihau, Kauai, Oahu, Molokai, and Maui; and to 8 to 12 feet along west facing shores of Niihau, Kauai, Oahu, and Molokai. * WHERE...North and west facing shores of Niihau, Kauai, Oahu, Molokai and north facing shores of Maui. * WHEN...Until 6 PM HST Thursday. Elevated surf may persist into Thursday night or early Friday. * IMPACTS...Moderate. Expect strong breaking waves, shore break, and strong longshore and rip currents making swimming difficult and dangerous. PRECAUTIONARY/PREPAREDNESS ACTIONS... Beachgoers, swimmers, and surfers should heed all advice given by ocean safety officials and exercise caution. && $$ Wroe
530 WHHW40 PHFO 061314 CFWHFO Coastal Hazard Message National Weather Service Honolulu HI 314 AM HST Wed Jan 6 2021 ...HIGH SURF ADVISORY FOR NORTH AND WEST FACING SHORES OF NIIHAU KAUAI OAHU MOLOKAI AND NORTH FACING SHORES OF MAUI... .Surf will gradually build later today and tonight, with surf along north and west shores peaking well above advisory levels into Thursday. Surf will then decline Thursday night and Friday. HIZ001>003-006>008-012-013-017-019-020-070215- /O.CON.PHFO.SU.Y.0002.000000T0000Z-210108T0400Z/ Niihau-Kauai Windward-Kauai Leeward-Waianae Coast- Oahu North Shore-Oahu Koolau-Molokai Windward-Molokai Leeward- Maui Windward West-Maui Central Valley-Windward Haleakala- 314 AM HST Wed Jan 6 2021 ...HIGH SURF ADVISORY REMAINS IN EFFECT UNTIL 6 PM HST THURSDAY... * WHAT...Surf of 10 to 15 feet this morning, increasing to 12 to 16 feet this afternoon along the north facing shores of Niihau, Kauai, Oahu, Molokai, and Maui; and 8 to 12 feet along the west facing shores of Niihau, Kauai, Oahu, and Molokai. Surf may grow even larger tonight and Thursday. * WHERE...North and west facing shores of Niihau, Kauai, Oahu, Molokai and north facing shores of Maui. * WHEN...Until 6 PM HST Thursday, but high surf may continue through the weekend. * IMPACTS...Moderate. Expect strong breaking waves, shore break, and strong longshore and rip currents making swimming difficult and dangerous. PRECAUTIONARY/PREPAREDNESS ACTIONS... Beachgoers, swimmers, and surfers should heed all advice given by ocean safety officials and exercise caution. Know your limits; when in doubt, do not go out. && $$ Birchard
343 WHHW40 PHFO 070125 CFWHFO Coastal Hazard Message National Weather Service Honolulu HI 325 PM HST Wed Jan 6 2021 ...HIGH SURF ADVISORY FOR NORTH AND WEST FACING SHORES OF NIIHAU KAUAI OAHU MOLOKAI AND NORTH FACING SHORES OF MAUI... .Surf will gradually build into tonight, with surf along north and west shores peaking well above advisory levels into Thursday. Surf will then decline Thursday night and Friday. HIZ001>003-006>008-012-013-017-019-020-071430- /O.CON.PHFO.SU.Y.0002.000000T0000Z-210108T0400Z/ Niihau-Kauai Windward-Kauai Leeward-Waianae Coast- Oahu North Shore-Oahu Koolau-Molokai Windward-Molokai Leeward- Maui Windward West-Maui Central Valley-Windward Haleakala- 325 PM HST Wed Jan 6 2021 ...HIGH SURF ADVISORY REMAINS IN EFFECT UNTIL 6 PM HST THURSDAY... * WHAT...Surf of 12 to 16 feet this afternoon, increasing to 18 to 22 feet tonight and Thursday along the north facing shores of Niihau, Kauai, Oahu, Molokai, and Maui. Surf of 8 to 12 feet this afternoon, increasing to 12 to 16 feet tonight and Thursday along the west facing shores of Niihau, Kauai, Oahu, and Molokai. * WHERE...North and west facing shores of Niihau, Kauai, Oahu, Molokai and north facing shores of Maui. * WHEN...Until 6 PM HST Thursday. High surf may persist through Thursday night, with another large swell possible this the weekend. * IMPACTS...Moderate. Expect strong breaking waves, shore break, and strong longshore and rip currents making swimming difficult and dangerous. PRECAUTIONARY/PREPAREDNESS ACTIONS... Beachgoers, swimmers, and surfers should heed all advice given by ocean safety officials and exercise caution. Know your limits; when in doubt, do not go out. && $$ Wroe
365 WHHW40 PHFO 070416 CCA CFWHFO Coastal Hazard Message...CORRECTED National Weather Service Honolulu HI 616 PM HST Wed Jan 6 2021 ...HIGH SURF ADVISORY FOR NORTH AND WEST FACING SHORES OF NIIHAU KAUAI OAHU MOLOKAI AND NORTH FACING SHORES OF MAUI... .Surf will gradually build tonight with surf along north and west shores peaking well above advisory levels into Thursday. Surf will then decline Thursday night and Friday. HIZ001>003-006>008-012-013-017-019-020-071430- /O.COR.PHFO.SU.Y.0002.000000T0000Z-210108T0400Z/ Niihau-Kauai Windward-Kauai Leeward-Waianae Coast- Oahu North Shore-Oahu Koolau-Molokai Windward-Molokai Leeward- Maui Windward West-Maui Central Valley-Windward Haleakala- 616 PM HST Wed Jan 6 2021 ...HIGH SURF ADVISORY REMAINS IN EFFECT UNTIL 6 PM HST THURSDAY... * WHAT...Surf will increase to 18 to 22 feet tonight and Thursday along the north-facing shores of Niihau, Kauai, Oahu, Molokai and Maui. Surf will lift to 12 to 16 feet tonight and Thursday along the west-facing shores of Niihau, Kauai, Oahu and Molokai. * WHERE...North and west-facing shores of Niihau, Kauai, Oahu, Molokai and north-facing shores of Maui. * WHEN...Until 6 PM HST Thursday. High surf may persist through Thursday night with another north swell possible this weekend. * IMPACTS...Moderate. Expect strong breaking waves, shore break, and strong longshore and rip currents making swimming difficult and dangerous. PRECAUTIONARY/PREPAREDNESS ACTIONS... Beachgoers, swimmers, and surfers should heed all advice given by ocean safety officials and exercise caution. Know your limits; when in doubt, do not go out. && $$
633 WHHW40 PHFO 071415 CFWHFO Coastal Hazard Message National Weather Service Honolulu HI 415 AM HST Thu Jan 7 2021 ...HIGH SURF ADVISORY THROUGH FRIDAY MORNING... .A large northwest swell will be passing through the local Hawaiian waters today. This will peak XL surf to well above advisory levels along the northern and western exposed shorelines of Niihau, Kauai, Oahu, Molokai and the northern facing shores of Maui. Surf will be lowering on Friday. HIZ001>003-006>008-012-013-017-019-020-080315- /O.EXT.PHFO.SU.Y.0002.000000T0000Z-210108T1600Z/ Niihau-Kauai Windward-Kauai Leeward-Waianae Coast- Oahu North Shore-Oahu Koolau-Molokai Windward-Molokai Leeward- Maui Windward West-Maui Central Valley-Windward Haleakala- 415 AM HST Thu Jan 7 2021 ...HIGH SURF ADVISORY NOW IN EFFECT UNTIL 6 AM HST FRIDAY... * WHAT...Surf will increase to 18 to 24 feet today along the north-facing shores of Niihau, Kauai, Oahu, Molokai and Maui. Surf will lift to 12 to 16 feet today along the west-facing shores of Niihau, Kauai, Oahu and Molokai. * WHERE...North and west-facing shores of Niihau, Kauai, Oahu, Molokai and north-facing shores of Maui. * WHEN...Until 6 AM HST Friday. * IMPACTS...Moderate. Expect strong breaking waves, shore break, and strong longshore and rip currents making swimming difficult and dangerous. PRECAUTIONARY/PREPAREDNESS ACTIONS... Beachgoers, swimmers, and surfers should heed all advice given by ocean safety officials and exercise caution. Boaters should expect recreational surfers and body boarders utilizing harbor channels to access surfing areas. && $$
630 WHHW40 PHFO 080130 CFWHFO Coastal Hazard Message National Weather Service Honolulu HI 330 PM HST Thu Jan 7 2021 ...HIGH SURF ADVISORY THROUGH FRIDAY AFTERNOON... .A large northwest swell will continue to produce advisory level surf along most north and west facing shores. HIZ001>003-006>008-012-013-017-019-020-081430- /O.EXT.PHFO.SU.Y.0002.000000T0000Z-210109T0400Z/ Niihau-Kauai Windward-Kauai Leeward-Waianae Coast- Oahu North Shore-Oahu Koolau-Molokai Windward-Molokai Leeward- Maui Windward West-Maui Central Valley-Windward Haleakala- 330 PM HST Thu Jan 7 2021 ...HIGH SURF ADVISORY NOW IN EFFECT UNTIL 6 PM HST FRIDAY... * WHAT...Surf heights of 18 to 24 feet tonight and 14 to 18 feet on Friday along north facing shores. Surf heights of 12 to 16 feet tonight and 9 to 12 feet Friday along west facing shores. * WHERE...North and west-facing shores of Niihau, Kauai, Oahu, Molokai and north-facing shores of Maui. * WHEN...Until 6 PM HST Friday. * IMPACTS...Moderate. Expect strong breaking waves, shore break, and strong longshore and rip currents making swimming difficult and dangerous. PRECAUTIONARY/PREPAREDNESS ACTIONS... Beachgoers, swimmers, and surfers should heed all advice given by ocean safety officials and exercise caution. && $$ Burke
118 WHHW40 PHFO 081334 CFWHFO Coastal Hazard Message National Weather Service Honolulu HI 334 AM HST Fri Jan 8 2021 ...HIGH SURF ADVISORY UNTIL THIS EVENING FOR NORTH AND WEST FACING SHORES OF NIIHAU KAUAI OAHU MOLOKAI AND NORTH FACING SHORES OF MAUI... .A large northwest swell will continue to produce advisory level surf along most north and west facing shores. HIZ001>003-006>008-012-013-017-019-020-090245- /O.CON.PHFO.SU.Y.0002.000000T0000Z-210109T0400Z/ Niihau-Kauai Windward-Kauai Leeward-Waianae Coast- Oahu North Shore-Oahu Koolau-Molokai Windward-Molokai Leeward- Maui Windward West-Maui Central Valley-Windward Haleakala- 334 AM HST Fri Jan 8 2021 ...HIGH SURF ADVISORY REMAINS IN EFFECT UNTIL 6 PM HST THIS EVENING... * WHAT...Surf heights of 14 to 18 feet this morning, lowering to 12 to 16 ft by this afternoon along north-facing shores. Surf heights of 8 to 12 feet today along west-facing shores. * WHERE...North and west-facing shores of Niihau, Kauai, Oahu, Molokai and north-facing shores of Maui. * WHEN...Until 6 PM HST this evening. * IMPACTS...Moderate. Expect strong breaking waves, shore break, and strong longshore and rip currents making swimming difficult and dangerous. PRECAUTIONARY/PREPAREDNESS ACTIONS... Beachgoers, swimmers, and surfers should heed all advice given by ocean safety officials and exercise caution. Boaters should expect recreational surfers and body boarders utilizing harbor channels to access surfing areas. && $$ RCB/PB
719 WHHW40 PHFO 090122 CFWHFO Coastal Hazard Message National Weather Service Honolulu HI 322 PM HST Fri Jan 8 2021 ...HIGH SURF ADVISORY IS CANCELLED FOR NORTH AND WEST FACING SHORES OF NIIHAU KAUAI OAHU MOLOKAI AND NORTH FACING SHORES OF MAUI... HIZ001>003-006>008-012-013-017-019-020-090230- /O.CAN.PHFO.SU.Y.0002.000000T0000Z-210109T0400Z/ Niihau-Kauai Windward-Kauai Leeward-Waianae Coast- Oahu North Shore-Oahu Koolau-Molokai Windward-Molokai Leeward- Maui Windward West-Maui Central Valley-Windward Haleakala- 322 PM HST Fri Jan 8 2021 ...HIGH SURF ADVISORY IS CANCELLED... The current north-northwest swell has dropped below advisory thresholds. A new north swell is expected late Saturday and will likely bring another round of advisory level surf by Saturday night. $$
Nearby
High Surf Advisories in Hawaii, 2021Every high surf advisory in 2021
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.