Alert archive / Hawaii / High Surf Warnings in 2021
High Surf Warning 6, NWS Honolulu, HI
NWS Honolulu, HI issued this high surf warning at Nov 1, 2021, 3:33 PM HST for Honolulu County, Kauai County, Kalawao County, Hawaii. It took effect at Nov 2, 2021, 3:23 AM HST. 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
- Nov 1, 2021, 3:33 PM HST (01:33 UTC)
- In effect from
- Nov 2, 2021, 3:23 AM HST
- Expired
- Nov 3, 2021, 3:17 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 01:34 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, 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
- 6 J/kg
- Mixed-layer CIN
- -251 J/kg
- Mixed-layer LCL
- 880 m above ground
- 0-6 km bulk shear
- 24 kt
- 0-1 km storm-relative helicity
- 34 m²/s²
- 0-3 km storm-relative helicity
- 54 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
586 WHHW40 PHFO 020133 CFWHFO Coastal Hazard Message National Weather Service Honolulu HI 333 PM HST Mon Nov 1 2021 ...HIGH SURF WARNING FOR NORTH AND WEST FACING SHORES OF NIIHAU KAUAI OAHU MOLOKAI AND FOR NORTH FACING SHORES OF MAUI... .A gradual downward trend of the current north-northwest swell is anticipated this evening through the first part of tonight. However, a larger and more significant swell will build quickly late tonight into Tuesday. This larger swell is expected to drive surf heights to warning levels along exposed north and west facing shores late tonight for Kauai and Tuesday for Oahu, Molokai, and Maui. HIZ001-003-006-007-017-029-037-039-040-045-047-021445- /O.CAN.PHFO.SU.Y.0028.000000T0000Z-211102T0400Z/ /O.NEW.PHFO.SU.W.0006.211102T1600Z-211103T1600Z/ Niihau-Kauai Southwest-Waianae Coast-Oahu North Shore- Maui Windward West-Kauai North-Molokai Windward-Molokai North- Molokai West-Maui Central Valley North-Windward Haleakala- 333 PM HST Mon Nov 1 2021 ...HIGH SURF WARNING IN EFFECT FROM 6 AM TUESDAY TO 6 AM HST WEDNESDAY... ...HIGH SURF ADVISORY IS CANCELLED... * WHAT...For north facing shores, surf 8 to 12 feet tonight, increasing to 22 to 26 feet late tonight into Tuesday. For west facing shores, surf 7 to 10 feet tonight, increasing to 15 to 20 feet late tonight into Tuesday. * WHERE...North and west facing shores of Niihau, Kauai, Oahu and Molokai, and north facing shores of Maui. * WHEN...From 6 AM Tuesday to 6 AM HST Wednesday. * 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. Beachgoers, swimmers, and surfers should heed all advice given by ocean safety officials and exercise caution. && $$
4 follow-up statements
143 WHHW40 PHFO 021323 CFWHFO Coastal Hazard Message National Weather Service Honolulu HI 323 AM HST Tue Nov 2 2021 ...HIGH SURF WARNING FOR NORTH AND WEST FACING SHORES OF NIIHAU KAUAI OAHU AND MOLOKAI AND FOR NORTH FACING SHORES OF MAUI... .A large north-northwest swell will bring warning level surf to the exposed north and west facing shores of most islands today, beginning with Kauai at around sunrise, and the remaining islands from Oahu to Maui the rest of today. Warning level surf will continue through tonight, although the swell will be subsiding. Once the surf lowers to below warning levels, expect a High Surf Advisory to be issued. HIZ001-003-006-007-017-029-037-039-040-045-047-030230- /O.EXT.PHFO.SU.W.0006.211102T1323Z-211103T1600Z/ Niihau-Kauai Southwest-Waianae Coast-Oahu North Shore- Maui Windward West-Kauai North-Molokai Windward-Molokai North- Molokai West-Maui Central Valley North-Windward Haleakala- 323 AM HST Tue Nov 2 2021 ...HIGH SURF WARNING NOW IN EFFECT UNTIL 6 AM HST WEDNESDAY... * WHAT...For north facing shores, surf 22 to 26 feet today, continuing through tonight. For west facing shores, surf 15 to 20 feet through tonight. * WHERE...North and west facing shores of Niihau, Kauai, Oahu and Molokai, and north facing shores of Maui. * WHEN...Until 6 AM HST Wednesday. * IMPACTS...High. Expect ocean water occasionally sweeping across portions of beaches, very strong breaking waves, and strong longshore and rip currents. Breaking waves may occasionally impact harbors making navigating the harbor channel dangerous. PRECAUTIONARY/PREPAREDNESS ACTIONS... Large, breaking surf, significant shorebreak, and dangerous currents make entering the water very hazardous. Anyone entering the water could face significant injury or death. && $$
963 WHHW40 PHFO 022127 CFWHFO Coastal Hazard Message National Weather Service Honolulu HI 1127 AM HST Tue Nov 2 2021 ...HIGH SURF WARNING FOR NORTH AND WEST FACING SHORES OF NIIHAU KAUAI OAHU AND MOLOKAI AND FOR NORTH FACING SHORES OF MAUI... .A large north-northwest swell will peak this afternoon through this evening and then steadily decline Wednesday. HIZ001-003-006-007-017-029-037-039-040-045-047-031030- /O.CON.PHFO.SU.W.0006.000000T0000Z-211103T1600Z/ Niihau-Kauai Southwest-Waianae Coast-Oahu North Shore- Maui Windward West-Kauai North-Molokai Windward-Molokai North- Molokai West-Maui Central Valley North-Windward Haleakala- 1127 AM HST Tue Nov 2 2021 ...HIGH SURF WARNING REMAINS IN EFFECT UNTIL 6 AM HST WEDNESDAY... * WHAT...For north facing shores, surf 20 to 30 feet today, gradually lowering tonight. For west facing shores, surf 18 to 22 feet today, gradually lowering tonight. * WHERE...North and west facing shores of Niihau, Kauai, Oahu and Molokai, and north facing shores of Maui. * WHEN...Until 6 AM HST Wednesday. * 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. && $$
867 WHHW40 PHFO 030159 CFWHFO Coastal Hazard Message National Weather Service Honolulu HI 359 PM HST Tue Nov 2 2021 ...HIGH SURF WARNING FOR NORTH AND WEST FACING SHORES OF NIIHAU KAUAI OAHU AND MOLOKAI AND FOR NORTH FACING SHORES OF MAUI... .A large north-northwest swell will steadily decline Wednesday. Surf may hold near warning levels through Wednesday. HIZ001-003-006-007-017-029-037-039-040-045-047-031500- /O.CON.PHFO.SU.W.0006.000000T0000Z-211103T1600Z/ Niihau-Kauai Southwest-Waianae Coast-Oahu North Shore- Maui Windward West-Kauai North-Molokai Windward-Molokai North- Molokai West-Maui Central Valley North-Windward Haleakala- 359 PM HST Tue Nov 2 2021 ...HIGH SURF WARNING REMAINS IN EFFECT UNTIL 6 AM HST WEDNESDAY... * WHAT...For north facing shores, surf 20 to 30 feet, lowering tonight to 18 to 24 feet Wednesday. For west facing shores, surf 18 to 22 feet, lowering to 12 to 16 ft Wednesday. * WHERE...North and west facing shores of Niihau, Kauai, Oahu and Molokai, and north facing shores of Maui. * WHEN...Until 6 AM HST Wednesday. * IMPACTS...High. Expect ocean water occasionally sweeping across portions of beaches, very strong breaking waves, and strong longshore and rip currents. Breaking waves may occasionally impact harbors making navigating the harbor channel dangerous. PRECAUTIONARY/PREPAREDNESS ACTIONS... Large, breaking surf, significant shorebreak, and dangerous currents make entering the water very hazardous. Anyone entering the water could face significant injury or death. && $$
849 WHHW40 PHFO 031317 CFWHFO Coastal Hazard Message National Weather Service Honolulu HI 317 AM HST Wed Nov 3 2021 ...HIGH SURF ADVISORY FOR NORTH AND WEST FACING SHORES OF NIIHAU KAUAI OAHU AND MOLOKAI AND NORTH FACING SHORES OF MAUI... .Surf has subsided to below warning levels, and will continue to lower through tonight. HIZ001-003-006-007-017-029-037-039-040-045-047-040230- /O.CAN.PHFO.SU.W.0006.000000T0000Z-211103T1600Z/ /O.NEW.PHFO.SU.Y.0029.211103T1317Z-211104T1600Z/ Niihau-Kauai Southwest-Waianae Coast-Oahu North Shore- Maui Windward West-Kauai North-Molokai Windward-Molokai North- Molokai West-Maui Central Valley North-Windward Haleakala- 317 AM HST Wed Nov 3 2021 ...HIGH SURF ADVISORY IN EFFECT UNTIL 6 AM HST THURSDAY... ...HIGH SURF WARNING IS CANCELLED... * WHAT...For north facing shores, surf 18 to 24 feet, lowering to 8 to 12 Thursday. For west facing shores, surf 14 to 18 feet, lowering to 4 to 6 feet Thursday. * WHERE...North and west facing shores of Niihau, Kauai, Oahu and Molokai, and north facing shores of Maui. * WHEN...Until 6 AM HST Thursday. * 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 |
|---|---|---|---|---|
| Nov 1, 3:27 PM HST | Small Craft Advisory | HFO | 6 days |
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.