Alert archive / Hawaii / High Surf Warnings in 2021
High Surf Warning 4, NWS Honolulu, HI
NWS Honolulu, HI issued this high surf warning at Feb 3, 2021, 4:34 PM HST for Honolulu County, Kauai County, Hawaii. It took effect at Feb 4, 2021, 3:31 AM HST. It was in force for 36 hr. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Feb 3, 2021, 4:34 PM HST (02:34 UTC)
- In effect from
- Feb 4, 2021, 3:31 AM HST
- Expired
- Feb 5, 2021, 3:35 PM HST
- In force
- 36 hr
- Issued by
- NWS Honolulu, HI
Counties Honolulu County, HI, Kauai County, HI
The radar
The South Kauai radar (PHKI), 76 km from the middle of the area, began a volume at 02:34 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 00:00Z, 2.6 hours before the alert went out and 60 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
- 902 J/kg
- Mixed-layer CIN
- -4 J/kg
- Mixed-layer LCL
- 804 m above ground
- 0-6 km bulk shear
- 48 kt
- 0-1 km storm-relative helicity
- 111 m²/s²
- 0-3 km storm-relative helicity
- 155 m²/s²
- Significant tornado parameter
- 0.9
- Supercell composite
- 5.4
The text
As transmitted.
059 WHHW40 PHFO 040234 CFWHFO Coastal Hazard Message National Weather Service Honolulu HI 434 PM HST Wed Feb 3 2021 ...HIGH SURF WARNING FOR THE NORTH AND WEST FACING SHORES OF NIIHAU KAUAI AND OAHU FROM 6 AM THURSDAY TO 6 AM HST FRIDAY... A large northwest swell will produce extra large surf along the northern and western exposed shorelines of Niihau, Kauai and Oahu Thursday. HIZ001>003-006>008-041545- /O.NEW.PHFO.SU.W.0004.210204T1600Z-210205T1600Z/ Niihau-Kauai Windward-Kauai Leeward-Waianae Coast- Oahu North Shore-Oahu Koolau- 434 PM HST Wed Feb 3 2021 ...HIGH SURF WARNING IN EFFECT FROM 6 AM THURSDAY TO 6 AM HST FRIDAY... * WHAT...Dangerously large breaking waves of between 25 to 35 feet. * WHERE...The north and western facing shores of Niihau, Kauai, and Oahu. * WHEN...From 6 AM Thursday to 6 AM HST Friday. * IMPACTS...High. Expect ocean water occasionally sweeping across portions of beaches, very strong breaking waves and strong longshore and rip currents. Breaking waves may occasionally impact harbors making navigating the harbor channel dangerous. PRECAUTIONARY/PREPAREDNESS ACTIONS... Large, breaking surf, significant shorebreak, and dangerous currents make entering the water very hazardous. Anyone entering the water could face significant injury or death. && $$
7 follow-up statements
943 WHHW40 PHFO 041331 CFWHFO Coastal Hazard Message National Weather Service Honolulu HI 331 AM HST Thu Feb 4 2021 ...HIGH SURF WARNING FOR THE NORTH AND WEST FACING SHORES OF NIIHAU KAUAI AND OAHU...AND HIGH SURF ADVISORY FOR NORTH AND WEST FACING SHORES OF MOLOKAI...NORTH FACING SHORES OF MAUI...AND WEST FACING SHORES OF THE BIG ISLAND... .A large northwest swell will generate warning- and advisory-level surf along north and west facing shores of Niihau, Kauai, Oahu, and Molokai, north facing shores of Maui, and west facing shores of the Big Island. HIZ001>003-006>008-050245- /O.EXT.PHFO.SU.W.0004.210204T1331Z-210205T1600Z/ Niihau-Kauai Windward-Kauai Leeward-Waianae Coast- Oahu North Shore-Oahu Koolau- 331 AM HST Thu Feb 4 2021 ...HIGH SURF WARNING NOW IN EFFECT UNTIL 6 AM HST FRIDAY... * WHAT...Surf of 20 to 30 feet, with 12 to 16 feet along the west facing shores of Oahu. * WHERE...The north and western facing shores of Niihau, Kauai, and Oahu. * WHEN...Until 6 AM HST Friday. * IMPACTS...High. Expect ocean water occasionally sweeping across portions of beaches, very strong breaking waves and strong longshore and rip currents. Breaking waves may occasionally impact harbors making navigating the harbor channel dangerous. PRECAUTIONARY/PREPAREDNESS ACTIONS... Large, breaking surf, significant shorebreak, and dangerous currents make entering the water very hazardous. Anyone entering the water could face significant injury or death. && $$ HIZ012-013-017-019-020-023-026-050245- /O.NEW.PHFO.SU.Y.0008.210204T1331Z-210205T1600Z/ Molokai Windward-Molokai Leeward-Maui Windward West- Maui Central Valley-Windward Haleakala-Kona-Kohala- 331 AM HST Thu Feb 4 2021 ...HIGH SURF ADVISORY IN EFFECT UNTIL 6 AM HST FRIDAY... * WHAT...Surf of 12 to 20 feet for Molokai and Maui, 6 to 10 feet for the Big Island. * WHERE...North and west facing shores of Molokai, north facing shores of Maui, and west facing shores of the Big Island. * 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. && $$
187 WHHW40 PHFO 041405 CCA CFWHFO Coastal Hazard Message...CORRECTED National Weather Service Honolulu HI 405 AM HST Thu Feb 4 2021 ...HIGH SURF WARNING FOR THE NORTH AND WEST FACING SHORES OF NIIHAU KAUAI AND OAHU...AND HIGH SURF ADVISORY FOR NORTH AND WEST FACING SHORES OF MOLOKAI...NORTH FACING SHORES OF MAUI...AND WEST FACING SHORES OF THE BIG ISLAND... .A large northwest swell will generate warning- and advisory-level surf along north and west facing shores of Niihau, Kauai, Oahu, and Molokai, north facing shores of Maui, and west facing shores of the Big Island. HIZ001>003-006>008-050245- /O.COR.PHFO.SU.W.0004.210204T1331Z-210205T1600Z/ Niihau-Kauai Windward-Kauai Leeward-Waianae Coast- Oahu North Shore-Oahu Koolau- 405 AM HST Thu Feb 4 2021 ...HIGH SURF WARNING NOW IN EFFECT UNTIL 6 AM HST FRIDAY... * WHAT...Surf of 20 to 30 feet along north and west facing shores of Niihau and Kauai. Surf of 20 to 25 feet along north facing shores of Oahu. Surf of 16 to 20 feet along west facing shores of Oahu. * WHERE...North and west facing shores of Niihau, Kauai, and Oahu. * WHEN...Until 6 AM HST Friday. * IMPACTS...High. Expect ocean water occasionally sweeping across portions of beaches, very strong breaking waves and strong longshore and rip currents. Breaking waves may occasionally impact harbors making navigating the harbor channel dangerous. PRECAUTIONARY/PREPAREDNESS ACTIONS... Large, breaking surf, significant shorebreak, and dangerous currents make entering the water very hazardous. Anyone entering the water could face significant injury or death. && $$ HIZ012-013-017-019-020-023-026-050245- /O.COR.PHFO.SU.Y.0008.210204T1402Z-210205T1600Z/ Molokai Windward-Molokai Leeward-Maui Windward West- Maui Central Valley-Windward Haleakala-Kona-Kohala- 405 AM HST Thu Feb 4 2021 ...HIGH SURF ADVISORY IN EFFECT UNTIL 6 AM HST FRIDAY... * WHAT...Surf of 16 to 20 feet for north facing shores of Molokai and Maui. Surf of 12 to 16 feet along west facing shores of Molokai. Surf of 6 to 10 feet along west facing shores of the Big Island. * WHERE...North and west facing shores of Molokai, north facing shores of Maui, and west facing shores of the Big Island. * 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. && $$
999 WHHW40 PHFO 050140 CFWHFO Coastal Hazard Message National Weather Service Honolulu HI 340 PM HST Thu Feb 4 2021 ...HIGH SURF WARNING FOR THE NORTH AND WEST FACING SHORES OF NIIHAU KAUAI AND OAHU... ...HIGH SURF ADVISORY FOR NORTH AND WEST FACING SHORES OF MOLOKAI...NORTH FACING SHORES OF MAUI...AND WEST FACING SHORES OF THE BIG ISLAND... .A large northwest swell will continue to produce high surf over exposed shores through Friday afternoon. HIZ001>003-006>008-051445- /O.EXT.PHFO.SU.W.0004.000000T0000Z-210206T0400Z/ Niihau-Kauai Windward-Kauai Leeward-Waianae Coast- Oahu North Shore-Oahu Koolau- 340 PM HST Thu Feb 4 2021 ...HIGH SURF WARNING NOW IN EFFECT UNTIL 6 PM HST FRIDAY... * WHAT...Surf of 20 to 25 feet along north facing shores of Niihau, Kauai and Oahu. Surf of 15 to 20 feet along west facing shores of Kauai. Surf of 10 to 15 feet along west facing shores of Oahu. * WHERE...North and west facing shores of Niihau, Kauai, and Oahu. * WHEN...Until 6 PM HST Friday. * IMPACTS...High. Expect ocean water occasionally sweeping across portions of beaches, very strong breaking waves and strong longshore and rip currents. Breaking waves may occasionally impact harbors making navigating the harbor channel dangerous. PRECAUTIONARY/PREPAREDNESS ACTIONS... Large, breaking surf, significant shorebreak, and dangerous currents make entering the water very hazardous. Anyone entering the water could face significant injury or death. && $$ HIZ012-013-017-019-020-023-026-051445- /O.EXT.PHFO.SU.Y.0008.000000T0000Z-210206T0400Z/ Molokai Windward-Molokai Leeward-Maui Windward West- Maui Central Valley-Windward Haleakala-Kona-Kohala- 340 PM HST Thu Feb 4 2021 ...HIGH SURF ADVISORY NOW IN EFFECT UNTIL 6 PM HST FRIDAY... * WHAT...Surf of 12 to 16 feet for north facing shores of Molokai and Maui. Surf of 8 to 12 feet along west facing shores of Molokai. Surf of 7 to 11 feet along west facing shores of the Big Island. * WHERE...North and west facing shores of Molokai, north facing shores of Maui, and west facing shores of the Big Island. * 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. Boaters should expect recreational surfers and body boarders utilizing harbor channels to access surfing areas. && $$ RCB
427 WHHW40 PHFO 050748 CFWHFO Coastal Hazard Message National Weather Service Honolulu HI 948 PM HST Thu Feb 4 2021 ...HIGH SURF WARNING FOR THE NORTH AND WEST FACING SHORES OF NIIHAU KAUAI AND OAHU... ... HIGH SURF ADVISORY FOR NORTH AND WEST FACING SHORES OF MOLOKAI ...NORTH FACING SHORES OF MAUI...AND WEST FACING SHORES OF THE BIG ISLAND... .Large northwest swells will continue to produce high surf over northern and western exposed shores. HIZ001>003-006>008-052100- /O.CON.PHFO.SU.W.0004.000000T0000Z-210206T0400Z/ Niihau-Kauai Windward-Kauai Leeward-Waianae Coast- Oahu North Shore-Oahu Koolau- 948 PM HST Thu Feb 4 2021 ...HIGH SURF WARNING REMAINS IN EFFECT UNTIL 6 PM HST FRIDAY... * WHAT...Surf of 20 to 25 feet along north facing shores of Niihau, Kauai and Oahu. Surf of 15 to 20 feet along west facing shores of Kauai and Oahu. * WHERE...North and west facing shores of Niihau, Kauai, and Oahu. * WHEN...Until 6 PM HST Friday. * IMPACTS...High. Expect ocean water occasionally sweeping across portions of beaches, very strong breaking waves, and strong longshore and rip currents. Breaking waves may occasionally impact harbors making navigating the harbor channel dangerous. PRECAUTIONARY/PREPAREDNESS ACTIONS... Large, breaking surf, significant shorebreak, and dangerous currents make entering the water very hazardous. Anyone entering the water could face significant injury or death. && $$ HIZ012-013-017-019-020-023-026-052100- /O.CON.PHFO.SU.Y.0008.000000T0000Z-210206T0400Z/ Molokai Windward-Molokai Leeward-Maui Windward West- Maui Central Valley-Windward Haleakala-Kona-Kohala- 948 PM HST Thu Feb 4 2021 ...HIGH SURF ADVISORY REMAINS IN EFFECT UNTIL 6 PM HST FRIDAY... * WHAT...Surf of 12 to 16 feet for north facing shores of Molokai and Maui. Surf of 8 to 12 feet along west facing shores of Molokai. Surf of 7 to 11 feet along west facing shores of the Big Island. * WHERE...North and west facing shores of Molokai, north facing shores of Maui and west facing shores of the Big Island. * 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. && $$
872 WHHW40 PHFO 051348 CFWHFO Coastal Hazard Message National Weather Service Honolulu HI 348 AM HST Fri Feb 5 2021 ...HIGH SURF WARNING FOR THE NORTH AND WEST FACING SHORES OF NIIHAU KAUAI AND OAHU... ... HIGH SURF ADVISORY FOR NORTH AND WEST FACING SHORES OF MOLOKAI ... NORTH FACING SHORES OF MAUI...AND WEST FACING SHORES OF THE BIG ISLAND... .Large northwest swells will produce high surf over northern and western exposed shorelines. HIZ001>003-006>008-060300- /O.CON.PHFO.SU.W.0004.000000T0000Z-210206T0400Z/ Niihau-Kauai Windward-Kauai Leeward-Waianae Coast- Oahu North Shore-Oahu Koolau- 348 AM HST Fri Feb 5 2021 ...HIGH SURF WARNING REMAINS IN EFFECT UNTIL 6 PM HST THIS EVENING... * WHAT...Surf of 20 to 25 feet along north facing shores of Niihau, Kauai and Oahu. Surf of 15 to 20 feet along west facing shores of Kauai and Oahu. * WHERE...North and west facing shores of Niihau, Kauai, and Oahu. * WHEN...Until 6 PM HST Friday. * IMPACTS...High. Expect ocean water occasionally sweeping across portions of beaches, very strong breaking waves, and strong longshore and rip currents. Breaking waves may occasionally impact harbors making navigating the harbor channel dangerous. PRECAUTIONARY/PREPAREDNESS ACTIONS... Large, breaking surf, significant shorebreak, and dangerous currents make entering the water very hazardous. Anyone entering the water could face significant injury or death. Boaters should be aware of an increased number of surfers and body boarders utilizing the harbor channel to access surfing areas. && $$ HIZ012-013-017-019-020-023-026-060300- /O.CON.PHFO.SU.Y.0008.000000T0000Z-210206T0400Z/ Molokai Windward-Molokai Leeward-Maui Windward West- Maui Central Valley-Windward Haleakala-Kona-Kohala- 348 AM HST Fri Feb 5 2021 ...HIGH SURF ADVISORY REMAINS IN EFFECT UNTIL 6 PM HST THIS EVENING... * WHAT...Surf of 14 to 18 feet for north facing shores of Molokai and Maui. Surf of 8 to 12 feet along west facing shores of Molokai. Surf of 7 to 10 feet along west facing shores of the Big Island. * WHERE...North and west facing shores of Molokai, north facing shores of Maui and west facing shores of the Big Island. * 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. && $$
861 WHHW40 PHFO 051411 CFWHFO Coastal Hazard Message National Weather Service Honolulu HI 411 AM HST Fri Feb 5 2021 ...HIGH SURF WARNING FOR THE NORTH AND WEST FACING SHORES OF NIIHAU KAUAI AND OAHU... ...HIGH SURF ADVISORY FOR NORTH AND WEST FACING SHORES OF MOLOKAI...NORTH FACING SHORES OF MAUI...AND WEST FACING SHORES OF THE BIG ISLAND... .Large northwest swells will produce high surf over northern and western exposed shorelines. HIZ001>003-006>008-060315- /O.CON.PHFO.SU.W.0004.000000T0000Z-210206T0400Z/ Niihau-Kauai Windward-Kauai Leeward-Waianae Coast- Oahu North Shore-Oahu Koolau- 411 AM HST Fri Feb 5 2021 ...HIGH SURF WARNING REMAINS IN EFFECT UNTIL 6 PM HST THIS EVENING... * WHAT...Surf of 20 to 25 feet along north facing shores of Niihau, Kauai and Oahu. Surf of 15 to 20 feet along west facing shores of Kauai and Oahu. * WHERE...North and west facing shores of Niihau, Kauai, and Oahu. * WHEN...Until 6 PM HST Friday. * IMPACTS...High. Expect ocean water occasionally sweeping across portions of beaches, very strong breaking waves, and strong longshore and rip currents. Breaking waves may occasionally impact harbors making navigating the harbor channel dangerous. PRECAUTIONARY/PREPAREDNESS ACTIONS... Large, breaking surf, significant shorebreak, and dangerous currents make entering the water very hazardous. Anyone entering the water could face significant injury or death. && $$ HIZ012-013-017-019-020-023-026-060315- /O.CON.PHFO.SU.Y.0008.000000T0000Z-210206T0400Z/ Molokai Windward-Molokai Leeward-Maui Windward West- Maui Central Valley-Windward Haleakala-Kona-Kohala- 411 AM HST Fri Feb 5 2021 ...HIGH SURF ADVISORY REMAINS IN EFFECT UNTIL 6 PM HST THIS EVENING... * WHAT...Surf of 14 to 18 feet for north facing shores of Molokai and Maui. Surf of 8 to 12 feet along west facing shores of Molokai. Surf of 7 to 10 feet along west facing shores of the Big Island. * WHERE...North and west facing shores of Molokai, north facing shores of Maui and west facing shores of the Big Island. * 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. && $$
200 WHHW40 PHFO 060135 CFWHFO Coastal Hazard Message National Weather Service Honolulu HI 335 PM HST Fri Feb 5 2021 ...HIGH SURF ADVISORY FOR NORTH AND WEST FACING SHORES OF NIIHAU KAUAI OAHU MOLOKAI...NORTH FACING SHORES OF MAUI...AND WEST FACING SHORES OF THE BIG ISLAND... .Large northwest swells will produce high surf over northern and western exposed shorelines. HIZ001>003-006>008-061445- /O.CAN.PHFO.SU.W.0004.000000T0000Z-210206T0400Z/ /O.EXB.PHFO.SU.Y.0008.000000T0000Z-210207T0400Z/ Niihau-Kauai Windward-Kauai Leeward-Waianae Coast- Oahu North Shore-Oahu Koolau- 335 PM HST Fri Feb 5 2021 ...HIGH SURF ADVISORY IN EFFECT UNTIL 6 PM HST SATURDAY... ...HIGH SURF WARNING IS CANCELLED... * WHAT...Surf of 15 to 20 feet tonight, lowering 12 to 16 feet early Saturday for north facing shores. Surf of 10 to 15 feet tonight, lowering to 8 to 12 feet early Saturday for west facing shores. * WHERE...North and west facing shores of Niihau, Kauai, and Oahu. * WHEN...Until 6 PM HST Saturday. * IMPACTS...Moderate. Expect strong breaking waves, shore break, and strong longshore and rip currents making swimming difficult and dangerous. * ADDITIONAL DETAILS... PRECAUTIONARY/PREPAREDNESS ACTIONS... Beachgoers, swimmers, and surfers should heed all advice given by ocean safety officials and exercise caution. Boaters should expect recreational surfers and body boarders utilizing harbor channels to access surfing areas. && $$ HIZ012-013-017-019-020-023-026-061445- /O.EXT.PHFO.SU.Y.0008.000000T0000Z-210207T0400Z/ Molokai Windward-Molokai Leeward-Maui Windward West- Maui Central Valley-Windward Haleakala-Kona-Kohala- 335 PM HST Fri Feb 5 2021 ...HIGH SURF ADVISORY NOW IN EFFECT UNTIL 6 PM HST SATURDAY... * WHAT...Surf of 12 to 16 feet tonight, lowering 10 to 15 feet early Saturday for north facing shores. Surf of 6 to 8 for west facing shores. * WHERE...North and west facing shores of Molokai, north facing shores of Maui and west facing shores of the Big Island. * WHEN...Until 6 PM HST Saturday. * 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. && $$ RCB
The office that day
Everything else NWS Honolulu, HI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Feb 3, 2:06 PM HST | Special Marine Warning | HFO | 114 min | |
| Feb 3, 2:31 PM HST | Special Weather Statement | HFO | Kalawao | 119 min |
| Feb 3, 4:13 PM HST | Small Craft Advisory | HFO | 71 hr | |
| Feb 4, 3:31 AM HST | High Surf Advisory | HFO | Hawaii, Honolulu, Kauai, Kalawao | 59 hr |
Nearby
High Surf Warnings in Hawaii, 2021Every high surf warning 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.