Alert archive / Hawaii / High Surf Warnings in 2023
High Surf Warning 9, NWS Honolulu, HI
NWS Honolulu, HI issued this high surf warning at Aug 7, 2023, 3:37 AM HST for Hawaii County, Kalawao County, Hawaii. It took effect at Aug 7, 2023, 6:00 PM HST. It was in force for 33 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
- Aug 7, 2023, 3:37 AM HST (13:37 UTC)
- In effect from
- Aug 7, 2023, 6:00 PM HST
- Expired
- Aug 9, 2023, 3:10 AM HST
- In force
- 33 hr
- Issued by
- NWS Honolulu, HI
Counties Hawaii County, HI, Kalawao County, HI
The radar
The Kamuela/Kohala Apt radar (PHKM), 57 km from the middle of the area, began a volume at 13:38 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 368 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
- 14 J/kg
- Mixed-layer CIN
- -11 J/kg
- Mixed-layer LCL
- 954 m above ground
- 0-6 km bulk shear
- 31 kt
- 0-1 km storm-relative helicity
- 17 m²/s²
- 0-3 km storm-relative helicity
- 70 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
What forecasters said that day
The local office's own words before this high surf warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Honolulu, HI wrote its last area forecast discussion before this high surf warning went out at Aug 7, 3:33 AM HST, 4 minutes earlier.
Area forecast discussion, Aug 7, 3:33 AM HST, 4 minutes before
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</html>The office that day
Everything else NWS Honolulu, HI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 6, 3:33 PM HST | Gale Warning | HFO | 3 days | |
| Aug 6, 3:33 PM HST | Small Craft Advisory | HFO | 4 days | |
| Aug 7, 3:15 AM HST | Red Flag Warning | HFO | 66 hr | |
| Aug 7, 3:15 AM HST | High Wind Warning | HFO | Hawaii, Honolulu, Kauai, Kalawao | 48 hr |
| Aug 7, 3:15 AM HST | Wind Advisory | HFO | Hawaii, Honolulu, Kauai, Kalawao | 66 hr |
Nearby
High Surf Warnings in Hawaii, 2023Every high surf warning in 2023
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.