Key Largo Marine Weather and 7-Day Dive Forecast

Wind Direction & Speed

Daytime wind FROM the indicated direction. Marine-point values are in kt; land proxies outside the point-text horizon are separately labeled in mph. Full gust/night/direction-change wording appears in the day details.

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Port Largo Atlantic planning reference

Open this report’s location reference in Google Maps. This is a planning reference, not a Stuart Scuba branch or confirmed departure point.

Planning area: Chart-derived Port Largo canal ocean entrance, Atlantic side [25.0894, -80.431]; WGS84 geodesic 2 NM (3704 m) due east at initial bearing 90° true gives [25.0893955, -80.394282]. Reference coordinates are approximately digitized from the current NOAA ENC (tens-of-metres uncertainty), not navigation waypoints. NWS request [25.0894, -80.3943]; returned model location 25.09, -80.4; marine zone GMZ042. Land forecast is a separate city point [25.0865, -80.4473]. NOAA Rock Harbor, Key Largo station 8723689 is a representative tide station, not an offshore measurement. Heights are ft above MLLW; no manual tide-time correction is applied.

Seas color scale: The improvement sequence is red to yellow, yellow to blue, then blue to green. This Stuart Scuba planning color combines sea height and period, using the upper daily height and shortest displayed period. At the same height, longer periods can improve the color by at most one neighboring step. For example, 4 ft at 5 s is red/yellow, 3 ft at 5 s is yellow/blue, and 2 ft at 5 s is mostly green with some blue; 2 ft at 2 s stays blue. The base anchors are green at 1 ft or less, blue at 2 ft, yellow at 3 ft and red at 4 ft, with interpolation between them. Period credit is zero at 2 s or less and grows to one color step at 6 s or longer; seas of 5 ft or higher remain red regardless of period. A bar blends only the two neighboring colors for its height/period index, rather than running through every color from top to bottom. Bars rise from zero to the upper height; a dashed mark shows the lower height. Hatching identifies an estimated height and/or period. Wave caps are illustrative. This is not an official NWS rating; wind, current, thunderstorms, advisories and the captain's current assessment still matter. Colors do not authorize a dive or charter.

Wind compasses: calm 0–3 kt; light above 3 and below 12 kt; breezy 12–19 kt; strong 20+ kt. mph is converted internally only for icon selection. Easterly amber and westerly teal are separate nearshore-direction cues, never dive clearance. Variable winds have no fixed bearing. Preserve full point/land qualifications in day details.

Sources and estimate basis: NOAA tides retrieved Nov 1, 3:01 PM EST. Forecast issue times: land: Nov 1, 2:15 PM EST, zone: Nov 1, 10:28 AM EST, point: Nov 1, 2:15 PM EST, grid: Nov 1, 2:15 PM EST. A new check is not a new model run. No forecast/observation average is used; no comparable independent forecast pair was established.

tides.json · retrieved Nov 1, 3:00 PM EST

land.json · retrieved Nov 1, 3:01 PM EST

grid.json · retrieved Nov 1, 3:01 PM EST

zone.json · retrieved Nov 1, 3:01 PM EST

marinepoint.json · retrieved Nov 1, 3:00 PM EST

nwps-viewer.html · retrieved Nov 1, 3:01 PM EST

2026-11-01: Period estimate: positive same-grid wavePeriod2 values, used as period guidance; not relabeled as an issued dominant period. Zero/missing periods excluded. Grid issue Nov 1, 2:15 PM EST; age 0.8 hours at retrieval.

2026-11-01: Period estimate from cached earlier same-grid wavePeriod2 guidance, issue Nov 1, 12:15 PM EST, actually retrieved Nov 1, 1:17 PM EST. The new Nov 1, 2:15 PM EST grid has only zero/missing periods. This is NOT a newly issued period; cached guidance age 2.8 hours. Grid issue Nov 1, 2:15 PM EST; age 0.8 hours at retrieval.

2026-11-02: Period estimate: positive same-grid wavePeriod2 values, used as period guidance; not relabeled as an issued dominant period. Zero/missing periods excluded. Grid issue Nov 1, 2:15 PM EST; age 0.8 hours at retrieval.

2026-11-02: Period estimate from cached earlier same-grid wavePeriod2 guidance, issue Nov 1, 12:15 PM EST, actually retrieved Nov 1, 1:17 PM EST. The new Nov 1, 2:15 PM EST grid has only zero/missing periods. This is NOT a newly issued period; cached guidance age 2.8 hours. Grid issue Nov 1, 2:15 PM EST; age 0.8 hours at retrieval.

2026-11-03: Period estimate: positive same-grid wavePeriod2 values, used as period guidance; not relabeled as an issued dominant period. Zero/missing periods excluded. Grid issue Nov 1, 2:15 PM EST; age 0.8 hours at retrieval.

2026-11-03: Period estimate from cached earlier same-grid wavePeriod2 guidance, issue Nov 1, 12:15 PM EST, actually retrieved Nov 1, 1:17 PM EST. The new Nov 1, 2:15 PM EST grid has only zero/missing periods. This is NOT a newly issued period; cached guidance age 2.8 hours. Grid issue Nov 1, 2:15 PM EST; age 0.8 hours at retrieval.

2026-11-04: Period estimate: positive same-grid wavePeriod2 values, used as period guidance; not relabeled as an issued dominant period. Zero/missing periods excluded. Grid issue Nov 1, 2:15 PM EST; age 0.8 hours at retrieval.

2026-11-04: Period estimate from cached earlier same-grid wavePeriod2 guidance, issue Nov 1, 12:15 PM EST, actually retrieved Nov 1, 1:17 PM EST. The new Nov 1, 2:15 PM EST grid has only zero/missing periods. This is NOT a newly issued period; cached guidance age 2.8 hours. Grid issue Nov 1, 2:15 PM EST; age 0.8 hours at retrieval.

2026-11-05: Period estimate: positive same-grid wavePeriod2 values, used as period guidance; not relabeled as an issued dominant period. Zero/missing periods excluded. Grid issue Nov 1, 2:15 PM EST; age 0.8 hours at retrieval.

2026-11-05: Period estimate from cached earlier same-grid wavePeriod2 guidance, issue Nov 1, 12:15 PM EST, actually retrieved Nov 1, 1:17 PM EST. The new Nov 1, 2:15 PM EST grid has only zero/missing periods. This is NOT a newly issued period; cached guidance age 2.8 hours. Grid issue Nov 1, 2:15 PM EST; age 0.8 hours at retrieval.

2026-11-06: Period estimate: positive same-grid wavePeriod2 values, used as period guidance; not relabeled as an issued dominant period. Zero/missing periods excluded. Grid issue Nov 1, 2:15 PM EST; age 0.8 hours at retrieval.

2026-11-06: Period estimate: low-confidence persistence of nearest prior positive same-grid period guidance from 2026-11-05; not an issued period for this date. Grid issue Nov 1, 2:15 PM EST; age 0.8 hours at retrieval.

2026-11-07: Period estimate: positive same-grid wavePeriod2 values, used as period guidance; not relabeled as an issued dominant period. Zero/missing periods excluded. Grid issue Nov 1, 2:15 PM EST; age 0.8 hours at retrieval.

2026-11-07: Period estimate: low-confidence persistence of nearest prior positive same-grid period guidance from 2026-11-06; not an issued period for this date. Grid issue Nov 1, 2:15 PM EST; age 0.8 hours at retrieval.

Solar method: NOAA approximate solar equations, apparent horizon zenith 90.833°, at the named location reference; approximately 1–2 minute accuracy, local America/New_York conversion. Tide predictions were sorted together and validated as strictly increasing and alternating H/L. The curve is a visual guide; DST uses each local day’s actual duration. No local tide heights/times were inferred.

Rock Harbor 8723689 is the Atlantic-side Key Largo reference (NOAA benchmark sheet calls it Point Charles), not Florida Bay. The marine JSON timezone metadata incorrectly reports Central time; its offset-bearing timestamps are converted by instant to America/New_York, not relabeled. MLRF1 Molasses Reef was disestablished; no current reading is presented. NWPS viewer opened but returned no numerical point series; it is not used to supply missing measurements.