Vermilion Water Watch: Stable Salinity Before Wednesday East Wind
Updated: Monday, October 26, 2026, at 2:30 am CDT
Publishing status: Review needed. Official observations are current enough for a same-day report. Human review remains appropriate because NWS expects heat indices of near advisory levels, isolated storms may produce sudden wind shifts, and midweek east wind that may produce choppy to rough bay water.
Fishing-impact summary
Atchafalaya River at Simmesport measured 130,000 ft3/s, with a preceding-day range of 129,000-132,000 ft3/s. This does not indicate a renewed freshwater pulse.
Cypremort Point salinity measured 10 ppt and ranged from 9 to 13 ppt during the preceding day. That is stable, moderately brackish water at the station, but it does not define every reef, pass, canal or Marsh Island drain.
Morgan City turbidity measured 50.1 FNU and ranged from 33.0 to 95.5 FNU during the preceding day. Morgan City does not directly measure Vermilion Bay clarity.
NOAA predicts low at 12:43 am (1.339 feet MLLW), then high at 3:47 am (1.456 feet MLLW), then low at 12:19 pm (-0.013 feet MLLW), then high at 9:06 pm (1.784 feet MLLW).
Measured conditions
Measurements are provisional USGS observations.
- Atchafalaya River at Simmesport: 130,000 ft3/s. Discharge ranged from 129,000 to 132,000 ft3/s during the preceding day.
- Wax Lake Outlet at Calumet: 58,400 ft3/s and 1.37-ft/s velocity. Tide and coastal backwater continue to cause large short-term variation.
- Lower Atchafalaya River at Morgan City: 68,900 ft3/s. Water temperature was 21.6C, salinity 0.2 ppt, turbidity 50.1 FNU and dissolved oxygen 8.2 mg/L.
- Vermilion Bay near Cypremort Point: Wind measured 9.8 mph from 25 degrees. Water temperature was 22.4C, salinity was 9.6 ppt and gage height was 3.05 feet.
Official forecast
The NWS Lake Charles Area Forecast Discussion says high pressure over the northern Gulf Coast will limit daily thunderstorm potential while heat remains a factor. The forecast discussion highlights heat indices in the near advisory levels range and notes that isolated storms may produce sudden wind shifts.
The official Vermilion and West Cote Blanche Bays coastal-waters forecast calls for smooth bay water today, followed by stronger east wind and choppier bay conditions during the midweek period. Winds and waves will be higher in and near thunderstorms.
Tides and storm-driven movement
NOAA astronomical predictions for Cypremort Point, relative to MLLW, are:
- Monday low: 12:43 am at 1.339 feet
- Monday high: 3:47 am at 1.456 feet
- Monday low: 12:19 pm at -0.013 feet
- Monday high: 9:06 pm at 1.784 feet
The USGS Cypremort Point gage uses a different datum from NOAA MLLW and should not be directly compared with these predicted tide heights.
Likely water movement - fishing inference
This section is a fishing inference based on measured observations, astronomical tides and official forecasts rather than direct bay-wide current observations.
Use the NOAA event times above to plan around tide turns; confirm current direction locally at drains, canal mouths, protected cuts and Southwest Pass. The most dependable current should be near constrictions, oyster edges and drain-to-bay transitions.
Cleaner, saltier water remains more likely around Southwest Pass, outer Marsh Island and deeper reef edges than around eastern Marsh Island, rain-fed drains and Atchafalaya-facing water. That distribution must be verified locally because the available stations do not measure every fishing area.
Water clarity and salinity outlook
Morgan City turbidity supports a manageable lower-river clarity signal, but Morgan City is not a Vermilion Bay clarity station. Cypremort Point has no turbidity sensor. Its salinity range is stable enough for Redfish, Specks and Black Drum, but it is one station.
NASA Worldview
Same-day NASA Worldview/GIBS true-color imagery is not expected to be available for an early report because daylight overpass and near-real-time processing occur later. This report uses the prior-day regional imagery context dated October 25, 2026.
NASA Worldview regional view - October 25, 2026
Satellite imagery is contextual only. It does not prove salinity, dissolved oxygen, harmful algae, general water quality or fish movement. Clouds, haze, sediment, sun glint, swath boundaries, cloud shadows and shallow-bottom reflectance can all affect apparent water color. No precise bay-wide clarity conclusion is made from satellite color alone.
Best areas
- Specks: Southwest Pass, outer or southern Marsh Island and deeper reef edges after water color, bait and salinity are confirmed.
- Redfish and Black Drum: Protected Marsh Island drains, points and oyster edges carrying manageable current.
- Flounder: Drain-to-bay transitions where moving water meets clearer bay water.
- Tripletail and Cobia: Nearshore structure or floating cover during light-wind periods, provided visibility is adequate and storms remain distant.
Recommended approach
Use the predicted tide times and observed current around protected Marsh Island drains, points and oyster edges where current is visible but manageable. Check Southwest Pass and outer Marsh Island for cleaner Speck water only after confirming water color and bait.
Confidence, uncertainty and localized conditions
Confidence is high in the official USGS observations, NOAA tide predictions and NWS marine forecast. Confidence is moderate in the tide-based fishing inference. Confidence is lower in bay-wide clarity because Cypremort Point has no turbidity sensor and Morgan City is not a direct Vermilion Bay clarity station.
Harmful algae and dissolved oxygen
LDEQ harmful-algal-bloom guidance remains the standing public reference for visible blue-green algae. No fetched source confirmed a new Vermilion Bay-specific HAB notice in this run. Morgan City dissolved oxygen measured 8.2 mg/L, which is not an oxygen-collapse signal at that station, but it does not establish conditions inside shallow, stagnant or warm canals.
Safety notes
No marine advisory is active in the fetched bay forecast, but heat indices may reach near advisory levels and isolated storms can produce lightning, sudden gusts and locally higher wind and waves. Recheck official forecasts before exposed Marsh Island, Southwest Pass or nearshore travel.
