Chandeleur Sound Marine Forecast
| Today...Tropical Storm Conditions Expected. Northeast Winds 30 To 40 Knots, Becoming East This Afternoon. Waves 6 To 7 Feet. A Chance Of Thunderstorms. Showers. |
| Tonight...Tropical Storm Conditions Possible. Southeast Winds 25 To 30 Knots With Gusts Up To 45 Knots, Becoming South 20 To 25 Knots With Gusts Up To 30 Knots After Midnight. Waves 5 To 6 Feet. A Chance Of Showers. |
| Thursday...Tropical Storm Conditions Possible. South Winds 20 To 25 Knots With Gusts Up To 30 Knots. Waves 4 To 5 Feet. A Chance Of Showers And Thunderstorms. |
| Thursday Night...South Winds 15 To 20 Knots, Diminishing To 10 To 15 Knots After Midnight. Waves 2 To 3 Feet. A Slight Chance Of Thunderstorms In The Evening. A Slight Chance Of Showers. |
| Friday...South Winds 5 To 10 Knots, Increasing To 10 To 15 Knots In The Afternoon. Waves 2 To 3 Feet. A Slight Chance Of Showers Early In The Morning. |
| Friday Night...South Winds 10 To 15 Knots, Becoming Southwest 5 To 10 Knots After Midnight. Waves Around 2 Feet. |
| Saturday...Southwest Winds 5 To 10 Knots. Waves 1 Foot Or Less, Then 1 To 2 Feet In The Afternoon. |
| Saturday Night...Southwest Winds 10 To 15 Knots. Waves 2 To 3 Feet. |
| Sunday...West Winds 5 To 10 Knots. Waves Around 2 Feet. |
| Sunday Night...West Winds 10 To 15 Knots. Waves Around 3 Feet. Winds And Waves Higher In And Near Thunderstorms. |
| Area Forecast Discussion National Weather Service New Orleans LA 552am CDT Wednesday July 22 2026 .SHORT TERM... (Now through Saturday) Issued at 1035pm CDT Tuesday July 21 2026 Abnormal tropical storm conditions is putting it lightly. I for one have never seen a tropical storm warning and a heat advisory/warning for the same time frame in the same area. But here we are. The northern half of the area will only notice the wind speeds rise with a tstorm possibly moving through but for the most part will be very hot and dry. As one moves closer to the coast, this is where the more typical conditions for tropical activity should be found. But even here, it will not be to the degree that one would expect. Rainfall will occur along with some storms but getting more than an inch of rain will be tough to do even right at the coast. Coastal flooding is expected but also not to the degree one would think either. Cloud cover is the biggest question mark at this point as it is unclear how far the low level rotating deck of clouds will get and remain long enough inland. We are sure this deck won't make it to the northern half of the area(maybe a fair weather cu field) but the southern half is questionable. Obviously where this deck is able to persist, the temps and heat index will be lower and this is the reason for the advisory part of the thinking. The deep convective cloud cover will quickly get forced to the SW, so basically, all we will depend on is the low level deck or swirl of clouds as high pressure continues to build from the north. We will be leaving all heat products in place for now since the extent inland of cloud cover is still questionable from this low level deck. Will some areas near the coast not reach heat warning criteria? That is a very likely scenario, but this would most likely be within a few parishes deep of the coast. As we move into Thursday, things will begin to improve as far as any rainfall and winds, but the heat will continue right through the weekend. Long Term (Saturday night through Tuesday) Issued at 1035pm CDT Tuesday July 21 2026 Surface and upper-level ridging should expand across the central Gulf Coast during the weekend as the remnants of Bertha move farther west and dissipates. Increasing subsidence and somewhat lower deep- layer moisture should reduce the shower/storm coverage compared with the middle of the week. However, sufficient moisture will remain for isolated to scattered afternoon convection along the sea breeze, lake breeze, and any remnant outflow boundaries. Rain chances should generally remain in the 20-40 percent range into Sunday, with the greatest coverage during peak afternoon heating. With weak steering flow, any storm that develops could produce locally heavy rainfall, frequent lightning, and brief gusty winds, but there is no current signal for organized severe weather or a widespread heavy rainfall event. Heat will again become the primary concern during the weekend and early next week. High temps should generally reach the low to mid 90s, with locally upper 90s possible across northern and western portions of the area, Persistent dewpoints in the upper 70s could produce afternoon heat indices between 105 and 110, potentially requiring additional heat headlines. The ridging may strengthen even further on Monday and Tuesday, which would favor slightly lower rain chances and continued above-normal temperatures. Confidence is moderate in the overall hot and mainly diurnal-driven convective pattern, but lower regarding daily thunderstorm coverage and whether the center of the ridge is strong enough to largely suppress convection. Marine Issued at 1035pm CDT Tuesday July 21 2026 The center of Tropical Storm Bertha will move west along the Louisiana gulf coast today through Thursday. As the system moves over our local waters, expect winds and seas to increase with tropical storm conditions possible for most if not all the local waters. The system will move west of the region Thursday and conditions should improve going into the upcoming weekend. NOAA New Orleans LA Office: Watches - Warnings - Advisories LA...Tropical Storm Watch for LAZ058-094-096. Tropical Storm Warning for LAZ064-070-076>078-087-089>093-095- 097>100. Extreme Heat Warning from 10am this morning to 8pm CDT this evening for LAZ034>037-039-046>048-056>058-064-070-071- 076>087-089>100. Coastal Flood Advisory until 4am CDT Thursday for LAZ058-077- 080-082-093-095-097-098. Coastal Flood Warning until 4am CDT Thursday for LAZ070-076-078- 091. GM...Tropical Storm Watch for GMZ529. Tropical Storm Warning for GMZ531>536-541-543-551-553-554-557- 570-572-575-577. MS...Tropical Storm Watch for MSZ083>085. Tropical Storm Warning for MSZ086>088. Extreme Heat Warning from 10am this morning to 8pm CDT this evening for MSZ068>071-077. Coastal Flood Warning until 4am CDT Thursday for MSZ086>088. Heat Advisory from 10am this morning to 8pm CDT this evening for MSZ083>088. GM... Tropical Storm Warning for GMZ532>536-541-543-551-553-554-557- 570-572-575-577. |
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