Alert archive / Hawaii / High Surf Warnings in 2021
High Surf Warning 2, NWS Honolulu, HI
NWS Honolulu, HI issued this high surf warning at Jan 13, 2021, 3:07 PM HST for Honolulu County, Kauai County, Kalawao County, Hawaii. It took effect at Jan 14, 2021, 12:00 AM HST. It was in force for 27 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
- Jan 13, 2021, 3:07 PM HST (01:07 UTC)
- In effect from
- Jan 14, 2021, 12:00 AM HST
- Expired
- Jan 15, 2021, 3:22 AM HST
- In force
- 27 hr
- 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 01:08 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, 1.1 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
- 6 J/kg
- Mixed-layer CIN
- -537 J/kg
- Mixed-layer LCL
- 1322 m above ground
- 0-6 km bulk shear
- 39 kt
- 0-1 km storm-relative helicity
- 62 m²/s²
- 0-3 km storm-relative helicity
- 93 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
149 WHHW40 PHFO 140107 CFWHFO Coastal Hazard Message National Weather Service Honolulu HI 307 PM HST Wed Jan 13 2021 ...HIGH SURF WARNING FOR NORTH AND WEST FACING SHORES OF NIIHAU KAUAI OAHU AND MOLOKAI AND NORTH FACING SHORES OF MAUI... .A very large northwest swell will roll through the coastal waters tonight and Thursday producing very large surf along north and west facing shores of the smaller islands. The swell will be mostly blocked from reaching the Big Island. HIZ001>003-006>008-012-013-018>020-141415- /O.NEW.PHFO.SU.W.0002.210114T1000Z-210115T0400Z/ Niihau-Kauai Windward-Kauai Leeward-Waianae Coast- Oahu North Shore-Oahu Koolau-Molokai Windward-Molokai Leeward- Maui Leeward West-Maui Central Valley-Windward Haleakala- 307 PM HST Wed Jan 13 2021 ...HIGH SURF WARNING IN EFFECT FROM MIDNIGHT TONIGHT TO 6 PM THURSDAY... * WHAT...Dangerously large breaking waves of 20 to 25 feet along north facing shores and 15 to 20 feet along west facing shores. * WHERE...Portions of Kauai, Maui, Molokai, Niihau and Oahu Hawaii. * WHEN...From midnight tonight to 6 PM Thursday. * IMPACTS...High. Expect ocean water occasionally sweeping across portions of beaches, very strong breaking waves, and strong currents. Breaking waves may occasionally impact harbors making navigating the harbor channels dangerous. Anyone entering the water could face significant injury or death. Coastal flooding is possible. * ADDITIONAL DETAILS...The very large swell will be accompanied by onshore winds making the surf very rough and sloppy. Very high tides will during the late night and early morning hours will increase the amount of wave runup. PRECAUTIONARY/PREPAREDNESS ACTIONS... Stay well away from the shoreline along the affected coasts. Be prepared for coastal erosion with some waves reaching coastal roads. Mariners should be extra careful entering and leaving harbors. && $$ Donaldson
4 follow-up statements
482 WHHW40 PHFO 141344 CFWHFO Coastal Hazard Message National Weather Service Honolulu HI 344 AM HST Thu Jan 14 2021 ...HIGH SURF WARNING FOR NORTH AND WEST FACING SHORES OF NIIHAU KAUAI OAHU AND MOLOKAI AND NORTH FACING SHORES OF MAUI... ...HIGH SURF ADVISORY FOR NORTH FACING SHORES OF THE BIG ISLAND... .A very large northwest swell will roll through the coastal waters today and tonight producing very large surf along north and west facing shores of the smaller islands. A more northerly overlapping swell will bring advisory level surf to the north facing shores of the Big Island. HIZ018-141445- /O.CAN.PHFO.SU.W.0002.000000T0000Z-210115T0400Z/ Maui Leeward West- 344 AM HST Thu Jan 14 2021 ...HIGH SURF WARNING IS CANCELLED... Surf along leeward west facing shores of Maui will not reach warning levels. $$ HIZ017-150245- /O.EXB.PHFO.SU.W.0002.000000T0000Z-210115T1600Z/ Maui Windward West- 344 AM HST Thu Jan 14 2021 ...HIGH SURF WARNING IN EFFECT UNTIL 6 AM HST FRIDAY... * WHAT...Dangerously large breaking waves of 25 to 35 feet along north facing shores. * WHERE...North facing shores of Maui. * WHEN...Until 6 AM HST Friday. * IMPACTS...High. Expect ocean water occasionally sweeping across portions of beaches, very strong breaking waves, and strong currents. Breaking waves may occasionally impact harbors making navigating the harbor channels dangerous. Anyone entering the water could face significant injury or death. Coastal flooding is possible. * ADDITIONAL DETAILS...The combination of large surf coinciding with peak monthly high tides may worsen beach erosion along shorelines exposed to north swell during the early morning hours. 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. && $$ HIZ001>003-006>008-012-013-019-020-150245- /O.EXT.PHFO.SU.W.0002.000000T0000Z-210115T1600Z/ Niihau-Kauai Windward-Kauai Leeward-Waianae Coast- Oahu North Shore-Oahu Koolau-Molokai Windward-Molokai Leeward- Maui Central Valley-Windward Haleakala- 344 AM HST Thu Jan 14 2021 ...HIGH SURF WARNING NOW IN EFFECT UNTIL 6 AM HST FRIDAY... * WHAT...Dangerously surf of 25 to 35 feet along north facing shores and 20 to 25 feet along west facing shores. * WHERE...North and west facing shores of Niihau, Kauai, Oahu, Molokai and north facing shores of Maui. * WHEN...Until 6 AM HST Friday. * IMPACTS...High. Expect ocean water occasionally sweeping across portions of beaches, very strong breaking waves, and strong longshore and rip currents. Breaking waves may occasionally impact harbors making navigating the harbor channel dangerous. * ADDITIONAL DETAILS...The combination of large surf coinciding with peak monthly high tides may worsen beach erosion along shorelines exposed to north and west swells during the early morning hours. PRECAUTIONARY/PREPAREDNESS ACTIONS... Large, breaking surf, significant shorebreak, and dangerous currents make entering the water very hazardous. Anyone entering the water could face significant injury or death. && $$ HIZ025-150245- /O.NEW.PHFO.SU.Y.0005.210114T1344Z-210115T1600Z/ Big Island North and East- 344 AM HST Thu Jan 14 2021 ...HIGH SURF ADVISORY IN EFFECT UNTIL 6 AM HST FRIDAY... * WHAT...Surf of 12 to 16 feet along north facing shores of the Big Island. * WHERE...North 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. * ADDITIONAL DETAILS...The combination of large surf coinciding with peak monthly high tides may worsen beach erosion along shorelines exposed to north swell during the early morning hours. PRECAUTIONARY/PREPAREDNESS ACTIONS... Beachgoers, swimmers, and surfers should heed all advice given by ocean safety officials and exercise caution. && $$
348 WHHW40 PHFO 141352 AAA CFWHFO Coastal Hazard Message...UPDATED National Weather Service Honolulu HI 352 AM HST Thu Jan 14 2021 ...HIGH SURF WARNING FOR NORTH AND WEST FACING SHORES OF NIIHAU KAUAI OAHU AND MOLOKAI AND NORTH FACING SHORES OF MAUI... ...HIGH SURF ADVISORY FOR NORTH FACING SHORES OF THE BIG ISLAND... .A very large northwest swell will roll through the coastal waters today and tonight producing very large surf along north and west facing shores of the smaller islands. A more northerly overlapping swell will bring advisory level surf to the north facing shores of the Big Island. HIZ001>003-006>008-012-013-017-019-020-150300- /O.CON.PHFO.SU.W.0002.000000T0000Z-210115T1600Z/ Niihau-Kauai Windward-Kauai Leeward-Waianae Coast- Oahu North Shore-Oahu Koolau-Molokai Windward-Molokai Leeward- Maui Windward West-Maui Central Valley-Windward Haleakala- 352 AM HST Thu Jan 14 2021 ...HIGH SURF WARNING REMAINS IN EFFECT UNTIL 6 AM HST FRIDAY... * WHAT...Dangerously large breaking waves of 25 to 35 feet along north facing shores. * WHERE...North facing shores of Maui. * WHEN...Until 6 AM HST Friday. * IMPACTS...High. Expect ocean water occasionally sweeping across portions of beaches, very strong breaking waves, and strong currents. Breaking waves may occasionally impact harbors making navigating the harbor channels dangerous. Anyone entering the water could face significant injury or death. Coastal flooding is possible. * ADDITIONAL DETAILS...The combination of large surf coinciding with peak monthly high tides may worsen beach erosion along shorelines exposed to north swell during the early morning hours. PRECAUTIONARY/PREPAREDNESS ACTIONS... Large, breaking surf, significant shorebreak, and dangerous currents make entering the water very hazardous. Anyone entering the water could face significant injury or death. && $$ HIZ025-150300- /O.CON.PHFO.SU.Y.0005.000000T0000Z-210115T1600Z/ Big Island North and East- 352 AM HST Thu Jan 14 2021 ...HIGH SURF ADVISORY REMAINS IN EFFECT UNTIL 6 AM HST FRIDAY... * WHAT...Surf of 12 to 16 feet along north facing shores of the Big Island. * WHERE...North 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. * ADDITIONAL DETAILS...The combination of large surf coinciding with peak monthly high tides may worsen beach erosion along shorelines exposed to north swell during the early morning hours. PRECAUTIONARY/PREPAREDNESS ACTIONS... Beachgoers, swimmers, and surfers should heed all advice given by ocean safety officials and exercise caution. && $$
435 WHHW40 PHFO 150138 CFWHFO Coastal Hazard Message National Weather Service Honolulu HI 338 PM HST Thu Jan 14 2021 ...HIGH SURF WARNING FOR NORTH AND WEST FACING SHORES OF NIIHAU KAUAI OAHU AND MOLOKAI AND NORTH FACING SHORES OF MAUI... ...HIGH SURF ADVISORY FOR NORTH FACING SHORES OF THE BIG ISLAND... .A very large northwest swell will hold through tonight, producing very large surf along north and west facing shores of the smaller islands, then quickly lower Friday. A more northerly overlapping swell will bring advisory level surf to the north facing shores of the Big Island. HIZ001>003-006>008-012-013-017-019-020-151445- /O.CON.PHFO.SU.W.0002.000000T0000Z-210115T1600Z/ Niihau-Kauai Windward-Kauai Leeward-Waianae Coast- Oahu North Shore-Oahu Koolau-Molokai Windward-Molokai Leeward- Maui Windward West-Maui Central Valley-Windward Haleakala- 338 PM HST Thu Jan 14 2021 ...HIGH SURF WARNING REMAINS IN EFFECT UNTIL 6 AM HST FRIDAY... * WHAT...Dangerous surf of 25 to 30 feet along north facing shores and 15 to 20 feet along west facing shores. * WHERE...North and west facing shores of Niihau, Kauai, Oahu, Molokai and north facing shores of Maui. * WHEN...Until 6 AM HST Friday. * IMPACTS...High. Expect ocean water occasionally sweeping across portions of beaches, very strong breaking waves, and strong currents. Breaking waves may occasionally impact harbors making navigating the harbor channels dangerous. Anyone entering the water could face significant injury or death. Coastal flooding is possible. * ADDITIONAL DETAILS...The combination of large surf coinciding with peak monthly high tides may worsen beach erosion along shorelines exposed to north swell during the early morning hours. PRECAUTIONARY/PREPAREDNESS ACTIONS... Large, breaking surf, significant shorebreak, and dangerous currents make entering the water very hazardous. Anyone entering the water could face significant injury or death. && $$ HIZ025-151445- /O.CON.PHFO.SU.Y.0005.000000T0000Z-210115T1600Z/ Big Island North and East- 338 PM HST Thu Jan 14 2021 ...HIGH SURF ADVISORY REMAINS IN EFFECT UNTIL 6 AM HST FRIDAY... * WHAT...Surf of 12 to 16 feet along north facing shores of the Big Island. * WHERE...North 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. * ADDITIONAL DETAILS...The combination of large surf coinciding with peak monthly high tides may worsen beach erosion along shorelines exposed to north swell during the early morning hours. PRECAUTIONARY/PREPAREDNESS ACTIONS... Beachgoers, swimmers, and surfers should heed all advice given by ocean safety officials and exercise caution. && $$
319 WHHW40 PHFO 151322 CFWHFO Coastal Hazard Message National Weather Service Honolulu HI 322 AM HST Fri Jan 15 2021 ...HIGH SURF ADVISORY FOR NORTH AND WEST FACING SHORES OF NIIHAU KAUAI OAHU MOLOKAI AND NORTH FACING SHORES OF MAUI AND BIG ISLAND... .The current northwest swell will slowly trend lower today. Surf heights will remain at advisory levels today for north and west facing shores of the smaller islands, including north facing shores of Maui and the Big Island. HIZ001>003-006>008-012-013-017-019-020-160230- /O.CAN.PHFO.SU.W.0002.000000T0000Z-210115T1600Z/ /O.EXB.PHFO.SU.Y.0005.000000T0000Z-210116T0400Z/ Niihau-Kauai Windward-Kauai Leeward-Waianae Coast- Oahu North Shore-Oahu Koolau-Molokai Windward-Molokai Leeward- Maui Windward West-Maui Central Valley-Windward Haleakala- 322 AM HST Fri Jan 15 2021 ...HIGH SURF ADVISORY IN EFFECT UNTIL 6 PM HST THIS EVENING... ...HIGH SURF WARNING IS CANCELLED... * WHAT...Surf of 10 to 15 feet along north facing shores and 8 to 12 for west facing shores. * WHERE...North and west facing shores of Niihau, Kauai, Oahu, Molokai and north facing shores of Maui. * WHEN...Until 6 PM HST this evening. * IMPACTS...Moderate. Expect strong breaking waves, shore break, and strong longshore and rip currents making swimming difficult and dangerous. PRECAUTIONARY/PREPAREDNESS ACTIONS... Beachgoers, swimmers, and surfers should heed all advice given by ocean safety officials and exercise caution. && $$ HIZ025-160230- /O.EXT.PHFO.SU.Y.0005.000000T0000Z-210116T0400Z/ Big Island North and East- 322 AM HST Fri Jan 15 2021 ...HIGH SURF ADVISORY NOW IN EFFECT UNTIL 6 PM HST THIS EVENING... * WHAT...Surf of 10 to 15 feet along north facing shores. * WHERE...North facing shores of the Big Island. * 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. && $$
The office that day
Everything else NWS Honolulu, HI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jan 14, 3:44 AM HST | High Surf Advisory | HFO | Honolulu, Kauai, Kalawao | 48 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.