Alert archive / Hawaii / High Surf Advisories in 2018
High Surf Advisory 37, NWS Honolulu, HI
NWS Honolulu, HI issued this high surf advisory at Aug 21, 2018, 4:08 PM HST for Honolulu County, Kauai County, Kalawao County, Hawaii. It took effect at Aug 22, 2018, 12:00 PM HST. It was in force for 18 hr.
The area
The counties it named.
The facts
- Issued
- Aug 21, 2018, 4:08 PM HST (02:08 UTC)
- In effect from
- Aug 22, 2018, 12:00 PM HST
- Expired
- Aug 23, 2018, 6:00 AM HST
- In force
- 18 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 02:08 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
Hilo, (PITO), launched 00:00Z, 2.1 hours before the alert went out and 391 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
- 107 J/kg
- Mixed-layer CIN
- -60 J/kg
- Mixed-layer LCL
- 984 m above ground
- 0-6 km bulk shear
- 3 kt
- 0-1 km storm-relative helicity
- -2 m²/s²
- 0-3 km storm-relative helicity
- 46 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 advisory 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 advisory went out at Aug 21, 10:04 AM HST, 6 hours 4 minutes earlier.
Area forecast discussion, Aug 21, 10:04 AM HST, 6 hours 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 21, 4:08 PM HST | High Surf Warning | HFO | Hawaii, Honolulu, Kauai, Kalawao | 3 days |
| Aug 21, 5:11 PM HST | Hurricane Warning | HFO | Hawaii, Honolulu, Kalawao | 72 hr |
| Aug 21, 5:34 PM HST | Tropical Storm Warning | HFO | Hawaii, Honolulu, Kalawao | 4 days |
| Aug 22, 1:22 PM HST | Areal Flood Advisory | HFO | Hawaii | 3 hr |
Nearby
High Surf Advisories in Hawaii, 2018Every high surf advisory in 2018
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.