Area Forecast Discussion
Issued by NWS New Orleans/Baton Rouge, LA
Issued by NWS New Orleans/Baton Rouge, LA
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227 FXUS64 KLIX 060836 AFDLIX Area Forecast Discussion National Weather Service New Orleans LA 336 AM CDT Mon May 6 2024 ...NEW SHORT TERM, LONG TERM, MARINE... .SHORT TERM... (Today through Tuesday) Issued at 330 AM CDT Mon May 6 2024 A rather zonal/progressive upper level flow will continue through the morning and into the afternoon hours across our region. With low level moisture continuing to increase with a southerly return flow, some low stratus/fog will be possible, especially across southwest MS and the Florida parishes of Louisiana. This should lift shortly after sunrise as stronger insolation takes place allowing clouds to mix out effectively. Later today and into tonight an H5 impulse begins to round the base of the larger scale trough centered over the plains and Rockies. Overall, this feature appears weak in nature, but could spark off an isolated shower or storm or two. At this juncture, with much of the support being to our northwest, only our northwestern tier will have the better POPs...even then generally at or below 30 percent. Overnight any rainfall that does develop will come to an end with the loss of daytime heating as well as the upper level impulse racing downstream. Tuesday, the region will transition to a more active southwesterly flow with an impulse or two expected to move northeast through the flow providing folks generally along and north of the I10/12 corridor with nonzero POPs. (Frye) && .LONG TERM... (Tuesday night through Sunday) Issued at 330 AM CDT Mon May 6 2024 Going into the long range, not much change to the overall pattern across our region early on. Heights will slightly increase with a 592dam ridge across the southern Gulf of Mexico with gradually rising heights over our region. Our area will remain under the active southwesterly flow, but any impulse appears very subtle at this juncture with very little in terms of POP/QPF signal at least through midweek. The broad scale trough across the northern Plains through the Rockies will continue to amplify with time. This will help a frontal boundary move a bit closer or into our region Thursday and Friday. With at least some better upper support late Thursday and into Friday, think that this will likely be the best rain chances we have this week, at least in terms of coverage and QPF. Going into the upcoming weekend things get a bit interesting. A bit of a cool down opposite the front is expected. The front actually looks to move through the region and as far south as South Florida (which is incredibly rare for this time of year). The front is being driven by a Canadian upper trough that amplifies over the Great Lakes and into the Ohio River Valley late this week and into the weekend. With a bit of a pattern change back to dry WNW or zonal upper flow, the weekend should actually be cooler and drier after reaching the lower and middle 90s on Wednesday and Thursday. Beyond this time the forecast becomes very tricky. The GFS has another Canadian trough amplifying over the plains and into the mid MS River Valley. At the same time, this trough begins to phase with a pacific trough finally kicking east from the Rockies. This would provide a source for a bit of an active weather pattern later this weekend and into early next including well below average temperatures for this time of year. The ECM has a bit different look with a short wave ridge across the MS River Valley on Monday. So needless to say overall confidence beyond Saturday drops pretty quickly. In fact, there`s roughly a 20 degree difference between the GFS and ECM in terms of temps on day seven. For now, we will lean more toward climo, which would favor more of an ECM solution, but not totally sold on tossing the GFS solution out the window as of now, as the ECM still shows the aforementioned Canadian trough...just avoids phasing with the ongoing Pacific trough over the western tier. (Frye) && .AVIATION... (06Z TAFS) Issued at 1141 PM CDT Sun May 5 2024 Most of the high cloud cover is rapidly shifting eastward with a shortwave that will be entirely east of the area in the next few hours. Main question will be extent of low clouds/fog around sunrise. While MVFR ceilings are likely at pretty much all terminals around sunrise, IFR or lower ceilings will be likely briefly at KMCB/KASD/KHDC/KHUM and perhaps KBTR. Do expect quick improvement around 14-15z, to at least MVFR. Most or all terminals will experience VFR conditions during the afternoon hours. The local area looks to be between shortwaves during the daytime hours on Monday, so the threat of convective activity looks to be rather limited, if any occurs at all. Lower clouds will again return overnight Monday night. (RW) && .MARINE... Issued at 330 AM CDT Mon May 6 2024 Moderate onshore flow will continue through mid to late week this week. Winds across the MS Sound and the tidal lakes may enhance some during the daytime. Used cautionary headlines respectively. Otherwise, winds begin to increase later on this week with SCA may be needed going into the late week and into te upcoming weekend. (Frye) && .PRELIMINARY POINT TEMPS/POPS... MCB 85 68 87 69 / 30 10 30 0 BTR 89 73 90 73 / 40 10 10 0 ASD 88 71 89 72 / 20 10 20 0 MSY 88 75 89 75 / 20 10 10 0 GPT 85 73 86 73 / 20 10 10 0 PQL 87 71 87 71 / 20 10 10 0 && .LIX WATCHES/WARNINGS/ADVISORIES... LA...None. GM...None. MS...None. GM...None. && $$ SHORT TERM...RDF LONG TERM....RDF AVIATION...RW MARINE...RDF