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"2016-11-13T07:18:00Z", "stage": 1.95, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "2016-10-07T14:54:00Z", "stage": 3.21, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "2015-10-27T09:00:00Z", "stage": 2, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "2015-10-02T13:00:00Z", "stage": 1.95, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "2015-09-30T11:06:00Z", "stage": 1.88, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "2015-09-29T10:12:00Z", "stage": 1.97, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "2015-09-28T09:24:00Z", "stage": 1.89, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "2015-09-27T08:30:00Z", "stage": 1.88, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "2015-09-27T21:06:00Z", "stage": 1.91, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "2015-09-26T20:06:00Z", "stage": 1.87, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "2015-09-24T18:24:00Z", "stage": 1.83, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "2012-11-17T11:18:00Z", "stage": 1.84, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "2012-11-15T09:36:00Z", "stage": 1.8, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "2010-11-03T06:42:00Z", "stage": 1.9, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "2008-09-25T18:42:00Z", "stage": 1.8, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "2008-08-22T13:30:00Z", "stage": 2.13, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "2005-10-05T11:06:00Z", "stage": 1.86, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "2004-09-26T20:42:00Z", "stage": 2.45, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "2001-11-15T08:42:00Z", "stage": 1.8, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "2001-09-16T21:00:00Z", "stage": 2.16, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "2001-09-15T20:24:00Z", "stage": 1.98, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "2001-09-14T19:18:00Z", "stage": 1.97, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "1984-11-23T09:12:00Z", "stage": 2.01, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "1981-11-13T09:42:00Z", "stage": 1.88, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "1964-09-10T11:00:00Z", "stage": 1.83, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "1964-09-09T23:00:00Z", "stage": 2.43, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "1964-09-09T10:00:00Z", "stage": 2.13, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "1953-09-24T09:00:00Z", "stage": 1.83, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "1944-10-19T11:00:00Z", "stage": 2.88, "flow": 0, "preliminary": "O", "olddatum": false }, { "occurredTime": "1898-10-02T00:00:00Z", "stage": 6.5, "flow": 0, "preliminary": "P", "olddatum": true } ] }, "lowWaters": { "historic": [] }, "impacts": [ { "stage": 3.3, "statement": "Major Flooding - 3.3 feet above MHHW - Major Coastal Flooding. Coastal Flood Warning needed. Extensive inundation of structures and roads in the area is expected. Evacuations of people or transfer of property to higher ground is likely and the advice of Emergency Management should be heeded. Extensive beach erosion is possible and possible breaches of the dune line...especially in lower areas and beach access areas. Significant past events: 2 October 1898 Hurricane." }, { "stage": 2.29, "statement": "Moderate Flooding - 2.3 feet above MHHW - Significant Coastal Flooding begins and Coastal Flood Warning needed. Some flooding of structures and roads along the coast, St Johns River and other inland waterways is expected. Evacuation of people or property to higher ground is possible and the advice of Emergency Management or local officials should be heeded. Significant past events: Hurricane Dora 1964." }, { "stage": 1.8, "statement": "Minor Flooding - 1.8 feet above MHHW - Coastal Flood Advisory is likely and Coastal Flood Warning Possible if significant wind and wave action drives water levels higher along the immediate coast. Flooding of low lying roads and campgrounds possible. Water levels may surge up the dune lines and into beach access areas. Some boat ramps and docks near the St. Johns River entrance and other inland waterways may begin to flood. Significant past events: Tropical Storm Fay...Hurricane Jeanne and 11/23/1984." }, { "stage": 1.3, "statement": "Action Stage - 1.3 feet above MHHW - Coastal Flood Advisory is possible if significant wind and wave action drives water levels higher along the immediate coast. Should water levels continue rising...preparations to protect property should begin." } ] }, "images": { "probability": { "weekint": { "stage": "", "flow": "", "volume": "" }, "entperiod": { "stage": "", "flow": "", "volume": "" }, "shortrange": "" }, "hydrograph": { "default": "https://water.noaa.gov/resources/hydrographs/mypf1_hg.png", "floodcat": "https://water.noaa.gov/resources/hydrographs/mypf1_record.png" }, "photos": [] }, "dataAttribution": [ { "abbrev": "National Ocean Service", "text": "National Ocean Service.", "title": "National Ocean Service", "url": "https://tidesandcurrents.noaa.gov/waterlevels.html?id=8720218&type=Tide+Data&name=Mayport%20(Bar%20Pilots%20Dock)&state=FL" } ], "impactsLowWaters": [], "normalThreshold": { "value": 0, "units": "ft" }, "hydronotes": [ { "statement": "Water levels are referenced to the Mean Higher High Water (MHHW) Datum. This datum can be used to approximate sea water inundation of normally dry ground near the coast. For specific impacts, please refer to the statements on this page.", "effective": "0101", "expiration": "1231" } ], "datums": { "vertical": { "value": [ { "label": "Mean Higher High Water", "abbrev": "MHHW*", "description": "The average of the higher high water height of each tidal day observed over the National Tidal Datum Epoch. For stations with shorter series, comparison of simultaneous observations with a control tide station is made in order to derive the equivalent datum of the National Tidal Datum Epoch.", "value": 0 }, { "label": "North American Vertical Datum of 1988", "abbrev": "NAVD88", "description": "A fixed reference for elevations determined by geodetic leveling. The datum was derived from a general adjustment of the first-order terrestrial leveling nets of the United States, Canada, and Mexico. In the adjustment, only the height of the primary tidal bench mark, referenced to the International Great Lakes Datum of 1985 (IGLD 85) local mean sea level height value, at Father Point, Rimouski, Quebec, Canada was held fixed, thus providing minimum constraint. NAVD 88 and IGLD 85 are identical. However, NAVD 88 bench mark values are given in Helmert orthometric height units while IGLD 85 values are in dynamic heights. See International Great Lakes Datum of 1985, National Geodetic Vertical Datum of 1929, and geopotential difference. NAVD 88 should not be used as Mean Sea Level.", "value": 1.96 } ] }, "horizontal": { "value": [] }, "notes": { "value": [] } }, "inundation": { "enabled": false, "url": "", "zeroDatum": null, "downloads": null, "siteSpecificInfo": "", "dataAttribution": [] }, "upstreamLid": "DMSF1", "downstreamLid": "", "inService": { "enabled": true, "message": "" }, "lowThreshold": { "units": "ft", "value": -7.46 }, "forecastReliability": "Forecasts are not available. Only observed stages are available for this point.", "TruncateObs": "-1", "TruncateFcst": "4", "ObservedFloodCategory": "no_flooding", "ForecastFloodCategory": "fcst_not_current" }