Where Can I Download Tide Data

Harmful algal blooms, or HABs, occur when colonies of algae grow out of control and produce toxic or harmful effects (NOAA). SECOORA has pulled together data resources related to the Red Tide in Florida, including current reporting, models, and observing tools. Please contact communications@secoora.org if you have a resource that would contribute to this page.

The Florida red tide occurs when high concentrations of the toxic dinoflagellate, Karenia brevis, is present. Karenia brevis creates toxins, called brevetoxins, that are threatening to human and animal health. Red tides have been responsible for millions of dollars in economic losses to the commercial and recreational fishing industries as well as recreation and tourism industries.

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Red tide toxins that end up in the food web can be transferred to other forms of life, from tiny zooplankton to birds, fish, aquatic mammals and humans. Red tides cause massive fish kills along the Florida coast, weaken or kill marine mammals, and, when the toxins are inhaled, cause respiratory distress in humans and marine mammals.

While red tide occurs naturally, knowing when and where a red tide threat may emerge and how it may evolve along the coast is important. A number of predictive tools and data resources are available or in development to investigate this natural phenomenon.

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NCEI is the long-term archive for all NOAA coastal tide gauge data: 1-minute water level data from the NOAA/National Ocean Service (NOS) Center for Operational Oceanographic Products and Services (CO-OPS) and high-resolution (10-second or 15-second) water level data from the Pacific Tsunami Warning Center (PTWC) and the National Tsunami Warning Center (NTWC). Coastal tide gauge data also undergo quality control and harmonic analysis at NCEI. The raw data and products are discoverable via the Map, Timelines, and THREDDS Data Server links. Data are provided as netCDF and as gzipped comma-separated-values (CSV).

Cite as: Center for Operational Oceanographic Products and Services (CO-OPS) (2007): CO-OPS 1-minute Tsunami Water Level Data. NOAA National Centers for Environmental Information. CO-OPS 1-minute Tsunami Water Level Data [access date].

Cite as: National Tsunami Warning Center (NTWC). 2016. Water Level Data from National Tsunami Warning Center Tide Gauges in Alaska and California. NOAA National Centers for Environmental Information. Water Level Data from National Tsunami Warning Center Tide Gauges in Alaska and California. Accessed [date].

Cite as: Pacific Tsunami Warning Center (PTWC). 2018. Water Level Data from Pacific Tsunami Warning Center Tide Gauges in Hawaii. NOAA National Centers for Environmental Information. Water Level Data from Pacific Tsunami Warning Center Tide Gauges in Hawaii4. Accessed [date].

In 2007, CO-OPS completed upgrades on tide stations in Alaska, the Pacific Islands, the West Coast, and the Caribbean. The upgraded tide stations are equipped with hardware and software to enable the collection and dissemination of 1-minute water level data. Access 1-minute data from the CO-OPS site.

Tide gauge data undergo quality control and harmonic analysis at NCEI. The raw data and products are discoverable via the Map, Timelines, and THREDDS Data Server links. Data are provided as netCDF and as gzipped comma-separated-values (CSV). Please contact haz.info@noaa.gov if you have questions.

The analog marigram (tide gauge record) collection contains more than 3,000 tsunami marigram records in both image and paper format, capturing worldwide observations of more than 390 tsunami events from 1854 to 1994. The majority of these tsunami marigram records were scanned from microfiche to high-resolution digital TIFF images during the NOAA Climate Data Modernization Program (CDMP). For many tsunami events prior to 1994, data resides only on the marigram records, making them of great historical significance. The Big Earth Data Initiative (BEDI) supplied funding in 2017 and 2018 to digitize marigrams (produce digital time-series in netCDF and CSV formats) from nine tsunami events.

An example of a scanned marigram image (Low resolution) shows a run-up detected at a Midway Island station from the magnitude 8.2 earthquake that occurred 90 km southeast of Shikotan Island on October 1, 1969. For many of the marigrams, digital data points will not be possible due to the quality of the analog data.

Nearly all annual blooms of the red tide-forming, toxic dinoflagellate Karenia brevis (K. brevis) pose a serious threat to coastal Southwest Florida. New research developed methods to analyze over 60 years of data of K. brevis cell counts, or concentrations, along the coast of SW Florida to define bloom severity, annual and interannual bloom cycles, and associated respiratory irritation.

The development of a bloom severity index and a respiratory irritation index allow for the comparison of bloom severity from year-to-year. The study findings confirm that blooms typically form in August and continue through the winter, with October and November being the months most frequently impacted. However, higher-than-usual offshore winds can suppress the respiratory impact of blooms. Years with severe blooms, such as 2006, 2012 and 2018, caused noticeable respiratory irritation, while other years with blooms had almost no respiratory impacts (2008, 2009, 2011, 2013, 2014). Calendar year 2018 had the most extensive red tide on the SW Florida coast. The respiratory irritation index measured in 2018 in Manatee and Sarasota Counties was the highest on record, and routine monitoring started in 2006.

Red tide blooms can discolor water, kill fish and marine mammals, contaminate shellfish, cause mild to severe respiratory irritation, and discourage tourism and recreational activities, leading to significant health and economic impacts in affected communities. These findings can be used to help managers and decision makers both evaluate the risks along the coast during events and design systems to better respond to and mitigate bloom impacts. The analysis also identifies a wind metric that can be used to associate bloom concentration to respiratory irritation, which may help future socioeconomic studies.

Website Owner: National Centers for Coastal Ocean Science

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Whether you're a coastal hiker, fisher or mariner, it's important to know how to read a tide table for safe navigation. Understanding tide heights and when high or low tides occur can help you decide the best time to explore tide pools, dig for clams, anchor your boat or beachcomb for shells. Knowing how to read tide tables can also help keep you safe. If you're backpacking on the coast, for example, you need to have a tide table (along with a topographic map) to know what time of day you can safely round a headland that can't be passed at certain tide levels.

Tides are the daily rise and fall in surface water levels of bays, gulfs, inlets and oceans and vary depending on the day and location. Tides are big periodic waves that move through the ocean in response to the gravitational attraction of the moon and the sun, according to the National Oceanic and Atmospheric Administration (NOAA). Most coastal areas experience two high tides and two low tides every day and they may not be equal. (In some places, such as the Gulf Coast, you may only get one high and one low tide per day.) The height difference between high tide and low tide is called the tidal range. In some areas, the difference between high and low tides may not be so noticeable. In other areas, it can be quite stark.

A tide table shows the daily predictions for the local time of low and high tides, as well as the height of those tides for a particular coastal area. The tide table is often shared in a tabular format.

NOAA's Center for Operational Oceanographic Products and Services (CO-OPS) makes tide predictions available for more than 3,000 locations around the U.S. The federal agency is the leading source of tide predictions, and its Tides and Currents website allows users to view and download tide information for up to two years, past and future.

(Note that tide tables are different from tide charts, which typically refer to a series of maps that show hourly water levels throughout a bay or estuary and are only available in a limited number of locations in the U.S.).

For example, let's say you wanted to do a backpacking trip along the coast of Washington state in mid-October and you need to know when high and low tides are.You may want to know whether you can hike or camp along the beach or whether you can pass a rocky point at certain times of the day.

The tide table information can be viewed in different formats, such as a graph or table. Below shows the tide information for two days: Oct. 12-13, 2019. (The example used is from NOAA, but other sources may provide similar information in different formatting or layout.)

In this example at Cape Alava, Washington, there are two high tides on Oct. 12: the first high tide at 12:19 a.m. and another that is even higher tide at 12:42 p.m. The first high tide of 7.96 feet means that the water level is 7.96 feet as measured above the average of the lowest low tides. (NOAA uses MLLW, or Mean Lower Low Water, which is the average height of the daily lowest tide observed over a 19-year period. Sometimes tide predictions are referenced to other levels, so it's good practice to note which one you're using). There are two low tides, one that is 0.92 feet at 6:30 a.m. and another of 1.02 feet at 6:53 p.m.

The tide table tells you the height and times of the low and high tides and when the tide is rising or falling. In our example above, you can see that from 6:53 p.m. on Oct. 12 to 12:57 a.m. on Oct. 13, the tide will rise about 7 feet vertically. So, if you are planning to camp on the beach somewhere near Cape Alava that night, you'll want to make sure you are well above the high tide line so you don't wake up with waves lapping at your tent door. (Note that a high tide of 7 feet only tells you that the tide will be 7 feet above the reference level of the MLLW; it doesn't tell you how far up the beach or the coastline that water will reach horizontally.) Still, when camping on the beach, you may be able to figure out the high tide water line by looking for features such as log jams, debris or "wet beach" on the coast, or check with a parks or coastal ranger before heading out. 152ee80cbc

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