


Area Forecast Discussion
Issued by NWS New Orleans/Baton Rouge, LA
Issued by NWS New Orleans/Baton Rouge, LA
Versions:
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
410 FXUS64 KLIX 022342 AFDLIX Area Forecast Discussion National Weather Service New Orleans LA 642 PM CDT Wed Apr 2 2025 ...New AVIATION... .SHORT TERM... (This evening through Friday night) Issued at 412 PM CDT Wed Apr 2 2025 Quite the windy day across the region with numerous locations seeing wind gusts greater than 40 mph and even a handful at 50 or higher. as of 20z BTR was the winner with a wind gust of 52 mph. As for temps it was quite warm with highs in the 80s across the region and a few topping out just in the upper 80s. As for the coastal flooding concerns outside of Waveland everywhere else has behaved and this may have a lot to do with not enough of an eastward component. Most of the area has winds between 160 and 180 and with only a minimal easterly component we aren`t pushing enough water west which would get trapped by the LA coast line. Our pattern has been getting setup for the past 18 hours and will continue to build with the ridge centered over the Bahamas and the large L/W trough still becoming established west of the continental divide and down the PAC coast. Deep southwesterly flow is in placed all the way from the Baja into the Great Lakes. This will be the driver of the weather across much of the CONUS with the greatest impacts across the Mid MS Valley, northern portions of the Lower MS Valley, and the OH/TN valleys. With that set up DO NOT look for a quick change to the weather regime across much of the area. A boundary will drift back and forth with each impulse but it will basically remain in the general vicinity of central TX northeast towards OH/IN. With that it will lead to multiple rounds of storms across the earlier mentioned areas but with the front struggling to move towards the region we will see light showers or sprinkles at best until everything finally become more progressive which looks like mid/late weekend. So prior to that what are we looking at, rather warm, breezy to windy conditions, and minor to moderate coastal flooding. It was windy as we mentioned earlier and winds will begin to slack around sunset but we will still see winds around 20 mph with gusts of 20-35 mph the next 3 days. The winds will be out of the south to south- southeast. The winds will be a good bit lighter than today so we do not anticipate a windy adv for tomorrow or Friday. As for tides we are still approaching spring tide which is tomorrow with Fridays high tide almost the same height. Even though there will not be much of an easterly component we will now be 36 to 48 hours of moderate to strong onshore flow and that fetch will finally become fully established. That was the fear yesterday that we may still be a day away from seeing the big surge however even if we saw a big surge in the tide tomorrow we still may not be at warning criteria yet but it may be close. Because of that we did cancel the coastal flood watch for tonight and replaced it tomorrow with a coastal flood adv for the entire coast. The watch still remains in place for the same areas tomorrow night and now through Saturday. No real change in the temperature forecast as it will be just as warm tomorrow and maybe even 1-2 degrees warmer in some areas with a few locations possibly touching 90. The other 2 things to watch is possible advection fog but we may be getting too warm for that with lows only falling into the 70s. Still need to keep an eye on coastal MS and around the mouth of the MS river where much cooler water is flowing down the river. Other small thing but really not much of an issue is the possibility of light rain or sprinkles Friday afternoon. Not really sure what this is associated with but all models are indicating light rain across the northern third/half of the cwa. It appears it could be a weak impulse that becomes detached form the main flow. No other real sign like a LL or mid lvl jet or some enhanced area of divergence aloft. Not seeing a theta E ridge or surge in PWs so we shall see what the models are picking up on as it may become a little more evident on satellite. /CAB/ && .LONG TERM... (Saturday through Tuesday night) Issued at 412 PM CDT Wed Apr 2 2025 Models are in good agreement with the area being impacted by thunderstorms Saturday night but at that point they begin to diverge. The GFS has a more substantial disturbance, is more progressive and everything swings through here during the overnight hours. However, the ECMWF has a stronger s/w on the backside of the L/W trough which holds the the L/W in place longer and actually causes the front to slow to a crawl across the Lower MS Valley and technically along our northwestern 3rd of the CWA. we are outlooked for severe weather by SPC and as mentioned yesterday by the time we get to Saturday evening we will have had a full 5 to 6 days of recovery and will be sufficiently primed. Shear will not be lacking either but the dynamics and kinematic fields still look to not be in line and timing looks to be the primary failure mode. If the dynamics and the kinematic field can line up more and trend a tad south then we could be seeing and overnight severe risk which is not what we would like. If things aren`t quite aligned and the best dynamics remain just to our north and behind the front we are looking at a more broad area thunderstorms. The other problem though is if things aren`t quite lined up to bring a more substantial severe threat then the ECMWF may be onto something and then that will mean that a heavy rain and possible flash flooding event will become a little more favorable. With so much moisture and instability in play a slow moving front parallel to the main flow is not what we want to see this time of the year. Think something similar to what northeast AR, southeast MO, west TN, and southern IL will see...it will just be for one day over our area at least. /CAB/ && .AVIATION... (00Z TAFS) Issued at 632 PM CDT Wed Apr 2 2025 MVFR to IFR cigs continue this evening and likely remain through the forecast period. These may very briefly break late afternoon Thursday, but are expected to return by Thursday evening. Gusty winds continue, slightly less than earlier at the surface but continue to be in the 30-35kts range just off the surface. This keeps the concern for the LLWS in place through the evening and overnight hours. && .MARINE... Issued at 412 PM CDT Wed Apr 2 2025 Gale Warning for the tidal lakes continues till 00z for wind gusts over 35 kts. After that SCY takes over for all waters again through tomorrow. Nothing is really going to change for the next 3 days leading to continued hazardous marine conditions. Good catch by the overnight shift of the possibility of marine fog but the biggest concern is we may not be too warm. Best chance for Marine fog should be along MS Sound and around the mouth of the MS river where the much cooler river waters enters the Gulf. A cold front will move through the region overnight Saturday and Sunday. This will bring showers and thunderstorms to the region and finally offshore flow after it passes. /CAB/ && .PRELIMINARY POINT TEMPS/POPS... MCB 71 87 72 86 / 0 0 0 30 BTR 74 88 74 89 / 0 0 0 20 ASD 74 86 73 84 / 0 0 0 20 MSY 74 86 74 86 / 0 0 0 10 GPT 71 81 71 80 / 0 10 0 20 PQL 71 82 70 81 / 0 0 0 10 && .LIX WATCHES/WARNINGS/ADVISORIES... LA...Wind Advisory until 7 PM CDT this evening for LAZ034>037-039- 046>048-056>060-064>071-076>090. Coastal Flood Advisory from 7 AM to 5 PM CDT Thursday for LAZ058- 066>070-076-078-080-082-084. Coastal Flood Watch from Thursday afternoon through Saturday afternoon for LAZ058-066>070-076-078-080-082-084. Coastal Flood Advisory until 7 PM CDT this evening for LAZ070- 076-078. GM...Gale Warning until 7 PM CDT this evening for GMZ530. Small Craft Advisory until 10 PM CDT Thursday for GMZ530. Small Craft Advisory until 10 PM CDT Thursday for GMZ532-534-536- 538-550-552-555-557-570-572-575-577. MS...Wind Advisory until 7 PM CDT this evening for MSZ068>071-077- 083>088. Coastal Flood Advisory from 7 AM to 5 PM CDT Thursday for MSZ086>088. Coastal Flood Watch from Thursday afternoon through Saturday afternoon for MSZ086>088. Coastal Flood Advisory until 7 PM CDT this evening for MSZ086. GM... Small Craft Advisory until 10 PM CDT Thursday for GMZ534-536-538- 550-552-555-557-570-572-575-577. && $$ SHORT TERM...CAB LONG TERM....CAB AVIATION...HL MARINE...CAB