Marine Weather and Tide Forecast for Jefferson, LA

LONG TERM
(Wednesday night through Monday)
Issued at 1254 AM CST Tue Jan 21 2025

The main story in the long term will be the continuation of below average temperatures, both daytime highs and overnight lows. That and any residual/lingering ice/snow, which may continue to make travel a bit of a challenge, even into Thursday morning. That said, there should be plenty of melting or sublimation as we finally "warm" into the mid and upper 40s by Thursday. Aloft, the area will continue to reside in a very dry northwest flow regime and a surface high pressure should drop southward into the region going into the weekend, so overall mostly a benign forecast from midweek through the first half of the upcoming weekend.

A general warming trend is expected, but it will be more noticed going into Sunday as a southerly return flow develops and some increase in heights aloft with a weak ridge developing over the western Caribbean Sea. By Sunday we'll start to look upstream as an H5 trough amplifies over the four corner states and allows a cold front to drop southward into the Red River Valley on Sunday and closer to our area by Monday, which could be our next shot at some measurable rain (just rain this time with temperatures by early next week approaching 70F again). (Frye)

AVIATION
(06Z TAFS)
Issued at 1134 PM CST Mon Jan 20 2025

A mix of very light sleet and rain has been reported over the past couple of hours as moisture continues to build down from aloft.
Temperatures are above freezing still, so no accumulation on surfaces has started yet. However, as the temperature drops and humidity increases after 09z, more snow will begin to develop at the terminals. The snow will turn intense after 12z with periods of heavier snow occurring between 15z and 22z. After 22z, drier air will begin to push in from the northwest and improving conditions are expected to develop between 22z and 00z at BTR and HDC and between 00z and 03z at HUM, MSY, HDC, NEW, ASD, and GPT.
All snow should end by 03z with a return to VFR conditions at all of the terminals by 06z. Winds will remain gusty from the north at all of the terminals as the low pressure system producing the snow passes to the south. PG

MARINE
Issued at 1254 AM CST Tue Jan 21 2025

Marine conditions will continue to decline as a surface gulf low continues to deepen to our south. This will push winds and seas up and even allow for gale conditions to develop for the open gulf waters. As the low pressure spreads eastward, expect pressure gradient to relax by mid to late week. High pressure will drop southward by late this weekend allowing for more favorable winds and seas across the marine zones. (Frye)

PRELIMINARY POINT TEMPS/POPS
MCB 32 12 39 19 / 90 0 0 0 BTR 35 13 39 21 / 90 0 0 0 ASD 33 14 40 22 / 90 10 0 0 MSY 33 22 38 27 / 100 10 0 0 GPT 32 16 39 22 / 90 20 0 0 PQL 35 16 42 21 / 90 20 0 0

LIX WATCHES/WARNINGS/ADVISORIES
LA...Cold Weather Advisory until 6 PM CST this evening for LAZ034>037- 039-046>048-056>060-064>071-076>090.

Winter Storm Warning until midnight CST tonight for LAZ034>037- 039-046>048-056>060-064>071-076>090.

Extreme Cold Warning from 6 PM this evening to 9 AM CST Wednesday for LAZ034>037-039-046>048-056>060-064>071- 076>090.

GM...Small Craft Advisory until midnight CST tonight for GMZ530-532- 534-536-538-557.

Small Craft Advisory until 6 AM CST early this morning for GMZ550-552-555-570-572-575-577.

Gale Warning from 6 AM this morning to midnight CST tonight for GMZ550-552-555-570-572-575-577.

MS...Cold Weather Advisory until 6 PM CST this evening for MSZ068>071- 077-083>088.

Winter Storm Warning until midnight CST tonight for MSZ068>071- 077-083>088.

Extreme Cold Warning from 6 PM this evening to 9 AM CST Wednesday for MSZ068>071-077-083>088.

GM...Small Craft Advisory until midnight CST tonight for GMZ532-534- 536-538-557.

Small Craft Advisory until 6 AM CST early this morning for GMZ552-555-570-572-575-577.

Gale Warning from 6 AM this morning to midnight CST tonight for GMZ552-555-570-572-575-577.