1.  Nawiliwili  Honolulu  Hilo
Tide and Sea Level Trends for the State of Hawaii
Source:
Tides: under “Products”  “Tides”  “Observed Data-Active Stations”
Sea Level: under “Products”  “Sea Level Trends” “CO-OPS Stations”
Hawaii Stations Considered:
Hilo
Honolulu
Nawiliwili
 Nawiliwili
 Honolulu
Group 1
Clint Conrad
 Hilo

2. Hilo
1 Week of Data:
Very similar trends for
each station:
Mostly Diurnal (1/day),
Some semidiurnal (2/day)
Amplitude of tidal
variation:
About 2-3 feet
Amplitude of sea level
anomaly:
About 0.25 feet (a few inches)
Honolulu
Nawiliwili

3. Long-Term Sea Level Trends:
State of Hawaii
Nawiliwili: Sea Level Rise = 1.5 mm/yr (45 years)

4. Long-Term Sea Level Trends:
State of Hawaii
Honolulu: Sea Level Rise = 1.5 mm/yr (94 years)

5. Long-Term Sea Level Trends:
State of Hawaii
Hilo: Sea Level Rise = 3.4 mm/yr (72 years)

6. Summary: State of Hawaii
Short-Term Tidal Variations:
 Mostly diurnal, a few feet in amplitude
 Tidal fluctuations are similar across Hawaii
 Water level anomalies are small: only a few inches
Long-Term Sea Level Change:
 Honolulu and Nawiliwili show 1.5 mm/yr of
sea level rise during the last century
 Hilo is anomalous: 3.4 mm/yr of sea level rise
 Hilo’s larger rise might be due to:
Gap in tide gauge data?
Something to do with big island volcanism?