Alert archive / Hawaii / High Surf Warnings in 2021
High Surf Warning 1, NWS Honolulu, HI
NWS Honolulu, HI issued this high surf warning at Jan 10, 2021, 3:26 AM HST for Honolulu County, Kauai County, Kalawao County, Hawaii. It was in force for 24 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 10, 2021, 3:26 AM HST (13:26 UTC)
- Expired
- Jan 11, 2021, 3:38 AM HST
- In force
- 24 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 13:27 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, 1.4 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
- 66 J/kg
- Mixed-layer CIN
- -197 J/kg
- Mixed-layer LCL
- 739 m above ground
- 0-6 km bulk shear
- 48 kt
- 0-1 km storm-relative helicity
- -19 m²/s²
- 0-3 km storm-relative helicity
- 43 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.0
The text
As transmitted.
224 WHHW40 PHFO 101326 CFWHFO Coastal Hazard Message National Weather Service Honolulu HI 326 AM HST Sun Jan 10 2021 ...HIGH SURF WARNING FOR NORTH AND WEST FACING SHORES OF NIIHAU KAUAI OAHU MOLOKAI AND NORTH FACING SHORES OF MAUI... ...HIGH SURF ADVISORY FOR NORTH FACING SHORES OF THE BIG ISLAND AND WEST FACING SHORES OF MAUI... .Surf will peak today, then ease tonight into Monday as a large north-northwest swell moves through. Surf will drop to advisory levels for exposed north and west facing shores of the smaller islands tonight. HIZ001>003-006>008-012-013-017-019-020-110230- /O.UPG.PHFO.SU.Y.0003.000000T0000Z-210111T1600Z/ /O.NEW.PHFO.SU.W.0001.210110T1326Z-210111T0400Z/ Niihau-Kauai Windward-Kauai Leeward-Waianae Coast- Oahu North Shore-Oahu Koolau-Molokai Windward-Molokai Leeward- Maui Windward West-Maui Central Valley-Windward Haleakala- 326 AM HST Sun Jan 10 2021 ...HIGH SURF WARNING IN EFFECT UNTIL 6 PM HST THIS EVENING... * WHAT...Surf of 20 to 25 feet along the north facing shores of Niihau, Kauai, Oahu, Molokai, and Maui. Surf of 15 to 20 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...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. && $$ HIZ018-110230- /O.EXB.PHFO.SU.Y.0003.000000T0000Z-210111T0400Z/ Maui Leeward West- 326 AM HST Sun Jan 10 2021 ...HIGH SURF ADVISORY IN EFFECT UNTIL 6 PM HST THIS EVENING... * WHAT...Surf of 8 to 12 feet along west facing shores of Maui. * WHERE...West facing shores of Maui. * WHEN...Until 6 PM HST this evening. * IMPACTS...Moderate. Expect strong breaking waves, shore break, and strong longshore and rip currents making swimming difficult and dangerous. * ADDITIONAL DETAILS... PRECAUTIONARY/PREPAREDNESS ACTIONS... Beachgoers, swimmers, and surfers should heed all advice given by ocean safety officials and exercise caution. && $$ HIZ025-110230- /O.CON.PHFO.SU.Y.0003.000000T0000Z-210111T1600Z/ Big Island North and East- 326 AM HST Sun Jan 10 2021 ...HIGH SURF ADVISORY REMAINS IN EFFECT UNTIL 6 AM HST MONDAY... * WHAT...Surf of 15 to 20 feet along north facing shores today, lowering to 10 to 15 feet tonight. * WHERE...North facing shores of the Big Island. * WHEN...through 6 AM HST Monday. * 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. && $$ Gibbs
3 follow-up statements
235 WHHW40 PHFO 101607 CFWHFO Coastal Hazard Message National Weather Service Honolulu HI 607 AM HST Sun Jan 10 2021 ...HIGH SURF WARNING FOR NORTH AND WEST FACING SHORES OF NIIHAU KAUAI OAHU MOLOKAI AND NORTH FACING SHORES OF MAUI AND BIG ISLAND... ...HIGH SURF ADVISORY FOR WEST FACING SHORES OF MAUI... .Surf will peak today, then ease tonight into Monday as a large north-northwest to north swell moves through. Surf will drop to advisory levels for exposed north and west facing shores tonight. HIZ025-110515- /O.UPG.PHFO.SU.Y.0003.000000T0000Z-210111T1600Z/ /O.EXA.PHFO.SU.W.0001.000000T0000Z-210111T0400Z/ Big Island North and East- 607 AM HST Sun Jan 10 2021 ...HIGH SURF WARNING IN EFFECT UNTIL 6 PM HST THIS EVENING... * WHAT...Surf of 20 to 25 feet along north facing shores today, lowering to 10 to 15 feet tonight. * WHERE...North facing shores of the Big Island. * WHEN...Until 6 PM HST this evening. * IMPACTS...Moderate. Expect strong breaking waves, shore break, and strong longshore and rip currents making swimming difficult and dangerous. PRECAUTIONARY/PREPAREDNESS ACTIONS... Large, breaking surf, significant shorebreak, and dangerous currents make entering the water very hazardous. Anyone entering the water could face significant injury or death. && $$ HIZ001>003-006>008-012-013-017-019-020-110400- /O.CON.PHFO.SU.W.0001.000000T0000Z-210111T0400Z/ Niihau-Kauai Windward-Kauai Leeward-Waianae Coast- Oahu North Shore-Oahu Koolau-Molokai Windward-Molokai Leeward- Maui Windward West-Maui Central Valley-Windward Haleakala- 607 AM HST Sun Jan 10 2021 ...HIGH SURF WARNING REMAINS IN EFFECT UNTIL 6 PM HST THIS EVENING... * WHAT...Surf of 20 to 25 feet along the north facing shores of Niihau, Kauai, Oahu, Molokai, and Maui. Surf of 15 to 20 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...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. && $$ HIZ018-110400- /O.CON.PHFO.SU.Y.0003.000000T0000Z-210111T0400Z/ Maui Leeward West- 607 AM HST Sun Jan 10 2021 ...HIGH SURF ADVISORY REMAINS IN EFFECT UNTIL 6 PM HST THIS EVENING... * WHAT...Surf of 8 to 12 feet along west facing shores of Maui. * WHERE...West facing shores of Maui. * WHEN...Until 6 PM HST this evening. * IMPACTS...Moderate. Expect strong breaking waves, shore break, and strong longshore and rip currents making swimming difficult and dangerous. * ADDITIONAL DETAILS... PRECAUTIONARY/PREPAREDNESS ACTIONS... Beachgoers, swimmers, and surfers should heed all advice given by ocean safety officials and exercise caution. && $$
880 WHHW40 PHFO 110159 CFWHFO Coastal Hazard Message National Weather Service Honolulu HI 359 PM HST Sun Jan 10 2021 ...HIGH SURF WARNING FOR NORTH AND WEST FACING SHORES MOLOKAI AND NORTH FACING SHORES OF MAUI AND THE BIG ISLAND... ...HIGH SURF ADVISORY FOR NORTH FACING SHORES OF NIIHAU KAUAI AND OAHU AND WEST FACING SHORES OF MAUI... .Surf will gradually lower tonight as a large north-northwest to north swell moves through, with highest surf expected over the eastern portions of the state. HIZ001-002-007-008-111500- /O.CAN.PHFO.SU.W.0001.000000T0000Z-210111T0400Z/ /O.EXB.PHFO.SU.Y.0003.000000T0000Z-210111T1600Z/ Niihau-Kauai Windward-Oahu North Shore-Oahu Koolau- 359 PM HST Sun Jan 10 2021 ...HIGH SURF ADVISORY IN EFFECT UNTIL 6 AM HST MONDAY... ...HIGH SURF WARNING IS CANCELLED... * WHAT...Surf of 12 to 20 feet along north facing shores. * WHERE...North facing shores of Kauai, Oahu, and Niihau. * WHEN...Until 6 AM HST Monday. * 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. && $$ HIZ003-006-110300- /O.CAN.PHFO.SU.W.0001.000000T0000Z-210111T0400Z/ Kauai Leeward-Waianae Coast- 359 PM HST Sun Jan 10 2021 ...HIGH SURF WARNING IS CANCELLED... Surf had diminished below warning and advisory levels. $$ HIZ012-013-017-019-020-025-111500- /O.EXT.PHFO.SU.W.0001.000000T0000Z-210111T1600Z/ Molokai Windward-Molokai Leeward-Maui Windward West- Maui Central Valley-Windward Haleakala-Big Island North and East- 359 PM HST Sun Jan 10 2021 ...HIGH SURF WARNING NOW IN EFFECT UNTIL 6 AM HST MONDAY... * WHAT...Surf of 20 to 25 feet along the north and west facing shores of Molokai and north facing shores of Maui and the Big Island. * WHERE...North and west facing shores of Molokai and north facing shores of Maui and the Big Island. * WHEN...Until 6 AM HST Monday. * 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. && $$ HIZ018-111500- /O.EXT.PHFO.SU.Y.0003.000000T0000Z-210111T1600Z/ Maui Leeward West- 359 PM HST Sun Jan 10 2021 ...HIGH SURF ADVISORY NOW IN EFFECT UNTIL 6 AM HST MONDAY... * WHAT...Surf of 8 to 12 feet along west facing shores of Maui. * WHERE...West facing shores of Maui. * WHEN...Until 6 AM HST Monday. * IMPACTS...Moderate. Expect strong breaking waves, shore break, and strong longshore and rip currents making swimming difficult and dangerous. PRECAUTIONARY/PREPAREDNESS ACTIONS... Beachgoers, swimmers, and surfers should heed all advice given by ocean safety officials and exercise caution. && $$
956 WHHW40 PHFO 111338 CFWHFO Coastal Hazard Message National Weather Service Honolulu HI 338 AM HST Mon Jan 11 2021 ...HIGH SURF ADVISORY FOR NORTH FACING SHORES OF MOLOKAI MAUI AND THE BIG ISLAND... .Surf will hold at advisory levels through the day today as the large north swell that peaked Sunday slowly lowers. The advisory for north facing shores in Maui County may need to be extended as another long-period northwest swell builds down the island chain later today through tonight. HIZ012-013-017-019-020-025-120245- /O.CAN.PHFO.SU.W.0001.000000T0000Z-210111T1600Z/ /O.NEW.PHFO.SU.Y.0004.210111T1338Z-210112T0400Z/ Molokai Windward-Molokai Leeward-Maui Windward West- Maui Central Valley-Windward Haleakala-Big Island North and East- 338 AM HST Mon Jan 11 2021 ...HIGH SURF ADVISORY IN EFFECT UNTIL 6 PM HST THIS EVENING... * WHAT...Surf of 10 to 15 feet along north facing shores. * WHERE...North facing shores of Molokai, Maui, and 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. && $$ HIZ001-002-007-008-018-111445- /O.CAN.PHFO.SU.Y.0003.000000T0000Z-210111T1600Z/ Niihau-Kauai Windward-Oahu North Shore-Oahu Koolau- Maui Leeward West- 338 AM HST Mon Jan 11 2021 ...HIGH SURF ADVISORY IS CANCELLED... Surf has lowered below the advisory levels. $$ Gibbs
The office that day
Everything else NWS Honolulu, HI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jan 9, 5:22 PM HST | Special Marine Warning | HFO | 113 min | |
| Jan 9, 5:29 PM HST | Special Weather Statement | HFO | Kalawao | 61 min |
| Jan 9, 5:47 PM HST | Special Weather Statement | HFO | Kalawao | 58 min |
| Jan 9, 6:51 PM HST | Areal Flood Advisory | HFO | Kalawao | 3 hr |
| Jan 9, 8:06 PM HST | Special Marine Warning | HFO | 114 min | |
| Jan 9, 8:17 PM HST | Areal Flood Advisory | HFO | Hawaii | 82 min |
| Jan 9, 11:05 PM HST | Special Marine Warning | HFO | 115 min |
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.