Boothville, LA to Southwest Pass of the Mississippi River Marine Forecast
| Today...Southeast Winds 5 To 10 Knots. Seas 2 To 3 Feet. Wave Detail: Southeast 2 Feet At 7 Seconds. |
| Tonight...South Winds 5 To 10 Knots. Seas Around 2 Feet. Wave Detail: Southeast 2 Feet At 6 Seconds. |
| Friday...Southeast Winds 5 To 10 Knots. Seas Around 2 Feet. Wave Detail: Southeast 2 Feet At 6 Seconds. |
| Friday Night...South Winds 5 To 10 Knots. Seas Around 2 Feet. Wave Detail: Southeast 2 Feet At 6 Seconds. |
| Saturday...South Winds 5 To 10 Knots. Seas Around 2 Feet. Wave Detail: South 2 Feet At 5 Seconds. |
| Saturday Night...South Winds 5 To 10 Knots, Becoming West 10 To 15 Knots With Gusts Up To 20 Knots After Midnight. Seas Around 2 Feet. Wave Detail: West 2 Feet At 4 Seconds And Southeast 1 Foot At 5 Seconds. A Slight Chance Of Showers And Thunderstorms After Midnight. |
| Sunday...North Winds 15 To 20 Knots, Becoming Northeast 20 To 25 Knots In The Afternoon. Seas 3 To 5 Feet, Occasionally To 6 Feet. Wave Detail: North 5 Feet At 4 Seconds. A Slight Chance Of Showers And Thunderstorms In The Morning. |
| Sunday Night...Northeast Winds 20 To 25 Knots. Seas 3 To 5 Feet, Occasionally To 6 Feet, Building To 5 To 7 Feet, Occasionally To 9 Feet After Midnight. Wave Detail: Northeast 5 Feet At 5 Seconds, Becoming Northeast 7 Feet At 6 Seconds. |
| Monday...Northeast Winds 20 To 25 Knots. Seas 5 To 7 Feet, Occasionally To 9 Feet. Wave Detail: Northeast 7 Feet At 7 Seconds. |
| Monday Night...East Winds 15 To 20 Knots. Seas 4 To 6 Feet, Occasionally To 8 Feet. Wave Detail: East 6 Feet At 8 Seconds. Winds And Seas Higher In And Near Thunderstorms. |
| Area Forecast Discussion National Weather Service New Orleans LA 551am CDT Wednesday August 19 2026 .SHORT TERM... (Now through Saturday) Issued at 1019pm CDT Tuesday August 18 2026 No big changes in the ongoing fcast. The old quasistationary 850mb trough that has been plagueing the SE CONUS will remain. At this writing, it is located from near Vicksburg to Pensacola where it bends and runs along the gulf coast to the Atlantic. Storms will once again fire along and south of this boundary but will not get too far south as they will run into stacked stability and suppression. Any one storm or two of those that develop will continue to have the potential to become severe. There may be even less in number of storms today than there have been. For most of the area, that will still be zero, but the most eastern portion of the area that has seen activity, could see less today. The heat headlines will remain as well, and cumulative effects can begin to have impacts as this continues. This same story should play out over the next few days. Some changes will occur by late Fri as a front moves toward the area causing a bit more storm activity that should help give the area some rain and cloud cover, not for most of Fri since the trough will be moving in late in the day, but Sat could have cloud cover long enough to retard heating. Residual cloud cover, if it can hold, may actually take the heat headlines down for a day or two by the end of the week. Long Term (Saturday night through Tuesday) Issued at 1019pm CDT Tuesday August 18 2026 As we move into the long term portion of the forecast on Saturday night, the global models agree on the large scale pattern with upper ridging centered near the Texas/Oklahoma Panhandles with an extension southeastward into about the western half of the Gulf. The upper trough will extend from the western Great Lakes to the Florida Peninsula. By Tuesday evening, the ridge won't have moved very much, being centered near the Texas-New Mexico border and still controlling the western Gulf, while strengthening slightly, with the upper trough off the Atlantic Coast. The frontal boundary between Interstates 20 and 40 Saturday night won't make much southward progress by Tuesday, either, perhaps approaching Interstate 10. Precipitable water values that will generally be between the 25th and 50th percentile on Sunday (1.6 inches) will increase to about the 75th percentile (2 inches) on Monday before dropping off again on Tuesday. Shortwaves moving southeastward into the base of the upper trough appear to be displaced far enough away from the local area that they may keep any organized MCS (Mesoscale Convective System, a complex of thunderstorms which becomes organized on a scale larger than the individual thunderstorms) activity away from the area during the Sunday-Tuesday period. Any isolated thunderstorm development is likely to continue recent trends of developing on lake and sea breeze boundaries early in the afternoon and propagating away from those boundaries. They also tend to dissipate prior to sunset. If there's going to be a day that favors a little greater threat of damaging winds, it would be Sunday, when forecast soundings show DCAPE values of 1100-1500. But that's also the day that looks to have the least (and possibly no) convective development. The hot weather isn't going anywhere either. NBM numbers continue to show highs between 95-100 Sunday through Tuesday. Even if we assume that these values are a couple degrees on the high side of reality, it still keeps a significant portion of the area 5-7 degrees above normal. The GFS (Global Forecast System) solutions do appear to be a little aggressive in bringing drier dew points into the area during this period, although the 18/18z wasn't quite as aggressive as earlier operational runs. ECMWF (European Centre for Medium-Range Weather Forecasts) solutions tended to keep dew points in the 70s. This would primarily impact overnight lows Monday and Tuesday mornings. The NBM solution favors a forecast along the lines of the ECMWF solutions. We'll see how this works out over the next day or two. Marine Issued at 1019pm CDT Tuesday August 18 2026 Surface high pressure centered over the central Gulf will maintain a generally weak pressure gradient through much of the period. A predominantly westerly flow will continue, with higher winds during the early morning and late night hours. Isolated thunderstorms will remain possible with winds and waves higher in and near this activity, particularly during the overnight and early morning hours. NOAA New Orleans LA Office: Watches - Warnings - Advisories LA... Heat Advisory from 11am this morning to 8pm CDT this evening for LAZ034>037-039-046>048-056>058-064-070-071-076>087- 089>100. GM...None. MS... Heat Advisory from 11am this morning to 8pm CDT this evening for MSZ068>071-077-083>088. GM...None. |
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