Alert archive / Hawaii / High Surf Warnings in 2021
High Surf Warning 5, NWS Honolulu, HI
NWS Honolulu, HI issued this high surf warning at Feb 12, 2021, 3:37 AM HST for Honolulu County, Kauai County, Kalawao County, Hawaii. It was in force for 48 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 12, 2021, 3:37 AM HST (13:37 UTC)
- Expired
- Feb 14, 2021, 3:53 AM HST
- In force
- 48 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 13:41 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, 1.6 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
- 15 J/kg
- Mixed-layer CIN
- -6 J/kg
- Mixed-layer LCL
- 836 m above ground
- 0-6 km bulk shear
- 18 kt
- 0-1 km storm-relative helicity
- -43 m²/s²
- 0-3 km storm-relative helicity
- -10 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
139 WHHW40 PHFO 121337 CFWHFO Coastal Hazard Message National Weather Service Honolulu HI 337 AM HST Fri Feb 12 2021 ...HIGH SURF WARNING FOR NORTH AND WEST FACING SHORES OF NIIHAU KAUAI OAHU AND MOLOKAI AND FOR NORTH FACING SHORES OF MAUI... .A northwest swell arriving this afternoon will boost surf heights above warning threshold across exposed shores of most of the smaller islands through Saturday afternoon. A High Surf Advisory may need to be issued later for west facing shores of the Big Island as this swell moves down the island chain. HIZ001>003-006>008-012-013-017-019-020-130245- /O.NEW.PHFO.SU.W.0005.210212T1337Z-210214T0400Z/ Niihau-Kauai Windward-Kauai Leeward-Waianae Coast- Oahu North Shore-Oahu Koolau-Molokai Windward-Molokai Leeward- Maui Windward West-Maui Central Valley-Windward Haleakala- 337 AM HST Fri Feb 12 2021 ...HIGH SURF WARNING IN EFFECT UNTIL 6 PM HST SATURDAY... * WHAT...Surf building to 25 to 35 feet along north facing shores of Niihau Kauai Oahu Molokai and Maui. Surf building to 22 to 26 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...Surf will quickly rise this afternoon, exceeding warning levels tonight through 6 PM HST Saturday. * 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. && $$
5 follow-up statements
735 WHHW40 PHFO 130145 CFWHFO Coastal Hazard Message National Weather Service Honolulu HI 345 PM HST Fri Feb 12 2021 ...HIGH SURF WARNING FOR NORTH AND WEST FACING SHORES OF NIIHAU KAUAI OAHU AND MOLOKAI AND FOR NORTH FACING SHORES OF MAUI... .A building northwest swell will rapidly boost surf heights above the warning threshold starting this evening into tonight for the exposed north and west shores of most of the smaller islands. Warning level surf will hold through Saturday afternoon. A High Surf Advisory may need to be issued later for west facing shores of the Big Island as this swell moves down the island chain. HIZ001>003-006>008-012-013-017-019-020-131445- /O.CON.PHFO.SU.W.0005.000000T0000Z-210214T0400Z/ Niihau-Kauai Windward-Kauai Leeward-Waianae Coast- Oahu North Shore-Oahu Koolau-Molokai Windward-Molokai Leeward- Maui Windward West-Maui Central Valley-Windward Haleakala- 345 PM HST Fri Feb 12 2021 ...HIGH SURF WARNING REMAINS IN EFFECT UNTIL 6 PM HST SATURDAY... * WHAT...Surf building to 25 to 35 feet along north facing shores of Niihau Kauai Oahu Molokai and Maui. Surf building to 22 to 26 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...Surf will quickly rise this evening and tonight, exceeding warning levels tonight through 6 PM HST Saturday. * 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. && $$
710 WHHW40 PHFO 131350 CFWHFO Coastal Hazard Message National Weather Service Honolulu HI 350 AM HST Sat Feb 13 2021 ...HIGH SURF WARNING FOR NORTH AND WEST FACING SHORES OF NIIHAU KAUAI OAHU MOLOKAI AND NORTH FACING SHORES OF MAUI... .Warning-level surf associated with a large northwest swell will continue to impact exposed north and west facing shores of the smaller islands through Sunday. Advisory-level surf is expected along exposed west facing shores of the Big Island through Sunday. HIZ001>003-006>008-012-013-017-019-020-140300- /O.EXT.PHFO.SU.W.0005.000000T0000Z-210215T0400Z/ Niihau-Kauai Windward-Kauai Leeward-Waianae Coast- Oahu North Shore-Oahu Koolau-Molokai Windward-Molokai Leeward- Maui Windward West-Maui Central Valley-Windward Haleakala- 350 AM HST Sat Feb 13 2021 ...HIGH SURF WARNING NOW IN EFFECT UNTIL 6 PM HST SUNDAY... * WHAT...Surf of 25 to 35 feet along north facing shores of Niihau Kauai Oahu Molokai and Maui. Surf of 22 to 26 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 Sunday. * IMPACTS...High. Expect ocean water occasionally sweeping across portions of beaches, very strong breaking waves, beach erosion, and strong longshore and rip currents. Minor overwash onto vulnerable low-lying coastal roadways will be possible, mainly through the early morning hours around the peak daily tides. 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. && $$ HIZ023-140300- /O.NEW.PHFO.SU.Y.0010.210213T1350Z-210215T0400Z/ Kona- 350 AM HST Sat Feb 13 2021 ...HIGH SURF ADVISORY IN EFFECT UNTIL 6 PM HST SUNDAY... * WHAT...Surf of 6 to 8 feet. * WHERE...West facing shores of the Big Island. * WHEN...Until 6 PM HST Sunday. * IMPACTS...Moderate. Expect strong breaking waves, shore break, and strong longshore and rip currents making swimming difficult and dangerous. PRECAUTIONARY/PREPAREDNESS ACTIONS... Beachgoers, swimmers, and surfers should heed all advice given by ocean safety officials and exercise caution. && $$ Gibbs
017 WHHW40 PHFO 131406 CCA CFWHFO Coastal Hazard Message...CORRECTED National Weather Service Honolulu HI 406 AM HST Sat Feb 13 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 WEST FACING SHORES OF THE BIG ISLAND... .Warning-level surf associated with a large northwest swell will continue to impact exposed north and west facing shores of the smaller islands through Sunday. Advisory-level surf is expected along exposed west facing shores of the Big Island through Sunday. HIZ001>003-006>008-012-013-017-019-020-140300- /O.EXT.PHFO.SU.W.0005.000000T0000Z-210215T0400Z/ Niihau-Kauai Windward-Kauai Leeward-Waianae Coast- Oahu North Shore-Oahu Koolau-Molokai Windward-Molokai Leeward- Maui Windward West-Maui Central Valley-Windward Haleakala- 406 AM HST Sat Feb 13 2021 ...HIGH SURF WARNING NOW IN EFFECT UNTIL 6 PM HST SUNDAY... * WHAT...Surf of 25 to 35 feet along north facing shores of Niihau Kauai Oahu Molokai and Maui. Surf of 22 to 26 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 Sunday. * IMPACTS...High. Expect ocean water occasionally sweeping across portions of beaches, very strong breaking waves, beach erosion, and strong longshore and rip currents. Minor overwash onto vulnerable low-lying coastal roadways will be possible, mainly through the early morning hours around the peak daily tides. 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. && $$ HIZ023-140300- /O.NEW.PHFO.SU.Y.0010.210213T1406Z-210215T0400Z/ Kona- 406 AM HST Sat Feb 13 2021 ...HIGH SURF ADVISORY IN EFFECT UNTIL 6 PM HST SUNDAY... * WHAT...Surf of 6 to 8 feet. * WHERE...West facing shores of the Big Island. * WHEN...Until 6 PM HST Sunday. * IMPACTS...Moderate. Expect strong breaking waves, shore break, and strong longshore and rip currents making swimming difficult and dangerous. PRECAUTIONARY/PREPAREDNESS ACTIONS... Beachgoers, swimmers, and surfers should heed all advice given by ocean safety officials and exercise caution. && $$ Gibbs
553 WHHW40 PHFO 140203 CFWHFO Coastal Hazard Message National Weather Service Honolulu HI 403 PM HST Sat Feb 13 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 WEST FACING SHORES OF THE BIG ISLAND... .The large northwest swell will gradually decline tonight, but a reinforcing west-northwest swell filling in on Sunday should maintain warning level surf along exposed north and west facing shores of the smaller islands through Sunday. Advisory-level surf is expected to hold along exposed west facing shores of the Big Island through Sunday and potentially into Monday. HIZ001>003-006>008-012-013-017-019-020-141515- /O.CON.PHFO.SU.W.0005.000000T0000Z-210215T0400Z/ Niihau-Kauai Windward-Kauai Leeward-Waianae Coast- Oahu North Shore-Oahu Koolau-Molokai Windward-Molokai Leeward- Maui Windward West-Maui Central Valley-Windward Haleakala- 403 PM HST Sat Feb 13 2021 ...HIGH SURF WARNING REMAINS IN EFFECT UNTIL 6 PM HST SUNDAY... * WHAT...Surf of 20 to 30 feet lowering to 20 to 25 feet on Sunday along north facing shores of Niihau Kauai Oahu Molokai and Maui. Surf of 18 to 22 feet lowering to 15 to 20 feet on Sunday 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 Sunday. * IMPACTS...High. Expect ocean water occasionally sweeping across portions of beaches, very strong breaking waves, beach erosion, and strong longshore and rip currents. Minor overwash onto vulnerable low-lying coastal roadways will be possible, mainly through the early morning hours around the peak daily tides. 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. && $$ HIZ023-141515- /O.CON.PHFO.SU.Y.0010.000000T0000Z-210215T0400Z/ Kona- 403 PM HST Sat Feb 13 2021 ...HIGH SURF ADVISORY REMAINS IN EFFECT UNTIL 6 PM HST SUNDAY... * WHAT...Surf of 6 to 8 feet. * WHERE...West facing shores of the Big Island. * WHEN...Until 6 PM HST Sunday. * IMPACTS...Moderate. Expect strong breaking waves, shore break, and strong longshore and rip currents making swimming difficult and dangerous. PRECAUTIONARY/PREPAREDNESS ACTIONS... Beachgoers, swimmers, and surfers should heed all advice given by ocean safety officials and exercise caution. && $$
892 WHHW40 PHFO 141353 CFWHFO Coastal Hazard Message National Weather Service Honolulu HI 353 AM HST Sun Feb 14 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... ...HIGH SURF WARNING IS CANCELLED... .A large west-northwest swell will slowly decline from northwest to southeast down the island chain this afternoon through Monday. HIZ006>008-012-013-017-019-020-150400- /O.CAN.PHFO.SU.W.0005.000000T0000Z-210215T0400Z/ /O.EXB.PHFO.SU.Y.0010.000000T0000Z-210215T1600Z/ Waianae Coast-Oahu North Shore-Oahu Koolau-Molokai Windward- Molokai Leeward-Maui Windward West-Maui Central Valley- Windward Haleakala- 353 AM HST Sun Feb 14 2021 ...HIGH SURF ADVISORY IN EFFECT UNTIL 6 AM HST MONDAY... ...HIGH SURF WARNING IS CANCELLED... * WHAT...Surf along north facing shores of Oahu and Molokai will be 15 to 20 feet today, lowering to 12 to 16 feet this tonight. Surf along north facing shores of Maui will be 14 to 18 feet today, lowering to 12 to 16 feet tonight. Surf along west facing shores of Oahu and Molokai will be 12 to 16 feet today, lowering to 9 to 12 feet tonight. * WHERE...North and west facing shores of Oahu, Molokai, and north 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. && $$ HIZ001>003-150400- /O.CAN.PHFO.SU.W.0005.000000T0000Z-210215T0400Z/ /O.EXB.PHFO.SU.Y.0010.000000T0000Z-210216T0400Z/ Niihau-Kauai Windward-Kauai Leeward- 353 AM HST Sun Feb 14 2021 ...HIGH SURF ADVISORY IN EFFECT UNTIL 6 PM HST MONDAY... ...HIGH SURF WARNING IS CANCELLED... * WHAT...Surf along north facing shores of Kauai and Niihau will be 18 to 22 feet today, lowering to 12 to 16 feet Monday. Surf along west facing shores of Kauai and Niihau will be 14 to 18 feet today, lowering to 9 to 12 feet Monday. * WHERE...North and west facing shores of Kauai and Niihau. * WHEN...Until 6 PM HST Monday. * IMPACTS...Moderate. Expect strong breaking waves, shore break, and strong longshore and rip currents making swimming difficult and dangerous. PRECAUTIONARY/PREPAREDNESS ACTIONS... Beachgoers, swimmers, and surfers should heed all advice given by ocean safety officials and exercise caution. && $$ HIZ023-150400- /O.EXT.PHFO.SU.Y.0010.000000T0000Z-210216T0400Z/ Kona- 353 AM HST Sun Feb 14 2021 ...HIGH SURF ADVISORY NOW IN EFFECT UNTIL 6 PM HST MONDAY... * WHAT...Surf will be 5 to 8 feet today, building to 6 to 9 feet Monday. * WHERE...West facing shores of the Big Island. * WHEN...Until 6 PM 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. && $$
The office that day
Everything else NWS Honolulu, HI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Feb 12, 3:18 AM HST | Wind Advisory | HFO | Hawaii | 25 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.