Area Forecast Discussion
Issued by NWS Lake Charles, LA
Issued by NWS Lake Charles, LA
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507 FXUS64 KLCH 272048 AFDLCH Area Forecast Discussion National Weather Service Lake Charles LA 348 PM CDT Sat Apr 27 2024 ...New SHORT TERM, LONG TERM, MARINE... .SHORT TERM... (Tonight through Monday night) Wx map shows a large surface high over the Eastern United States, an exiting surface low/mid to upper level shortwave over the Great Lakes, and another developing surface low over the TX/OK Panhandle, with the stronger deep layer mid to upper level trough across the Western U.S. Our region remains in the tight pressure gradient between the surface high to our east and surface low to the northwest. The result, its windy out there. Along and south of the I-10 corridor, southeast winds of 25 to 30 mph, with gusts of 35 to over 40 mph have already occurred. Winds north of the I-10 corridor slightly less around 20 to 25 mph with gusts 30 to 35 mph, all meeting the Wind Advisory criteria. Latest guidance continues to suggest these winds remaining steady state this evening and overnight as the pressure gradient tightens further. Thus, no changes to ongoing Wind Advisory. Coastal flooding issues continue to increase for late tonight through Sunday. Latest P-ETSS guidance show tides will be 1.75 to 2.5 feet Mean Higher High Water (MHHW) during the times of high tide from daybreak through late Sunday morning across coastal Jefferson County and coastal Cameron Parish. These numbers expected across the shores of Calcasieu Lake, Lake Charles, and Sabine Lake from late morning into Sunday afternoon. Thus, have upgraded these area to a Coastal Flood Warning. Further east across coastal Vermilion, Iberia, and St. Mary Parishes, the guidance shows levels to reach 1.5 to 1.75 feet Mean Higher High Water (MHHW) during the times of high tide. Thus, kept the ongoing Coastal Flood Advisory. By late Sunday afternoon into Monday, the longwave mid to upper level trough over the west expected to approach closer to the area, with the shortwave trough moving through the area on Monday. This will place our region in the diffluent flow aloft for late Sunday night into most of the day Monday. Thus, chances of showers and thunderstorms have increased during this period, along with expected rainfall amounts. Latest QPF expected from Sunday night through Monday night show 2 to 4 inches north of I-10, with generally 1 to 2 along I-10, and 0.5 to 1.0 inches along the coastal parishes and counties. WPC has continues Slight Risk of Excessive Rainfall along and north of I-10, Marginal Risk further south on the Day 2-3 outlooks essentially spanning from late Sunday night through Monday night. Severe thunderstorm potential has increased as well. SPC has increased areas north of U.S. 190 to a Slight Risk, Marginal Risk further south, for essentially the same time period. All modes of severe weather will be possible. 08/DML && .LONG TERM... (Tuesday through next Friday) Tuesday is anticipated to remain potentially stormy across the region as residual moisture remains in place. The weak frontal boundary is expected to have lifted back north, however PWATs are still forecast to remain in the 1.7 to 1.8 inch range which is around the 90th percentile for the date. These high moisture values will combine with a lack of ridging aloft and daytime heating to produce scattered to numerous showers and storms. Very weak ridging may nudge in the area beyond mid week, however isolated to scattered diurnal convection is still anticipated along with temperatures running several degrees above climo averages. && .AVIATION... (18Z TAFS) Mainly VFR expected this afternoon, with MVFR ceilings across the terminals by or shortly after 00z this evening. The biggest issue will be the strong southeast winds 20-25 kts with gusts 30-35 kts this afternoon, and remaining near or slightly less than these values tonight and Sunday due to the tight pressure gradient. 08/DML && .MARINE... A tight pressure gradient between a series of lows over the Southern Plains and a surface high off the east coast will allow for a prolonged period of strong and gusty onshore winds to continue through Sunday afternoon. Small Craft Advisory for all waters continues through Sunday afternoon. Winds and seas will slowly subside by Sunday night and Monday as the pressure gradient relaxes. Chances of showers and thunderstorms increase Sunday night through Tuesday morning as a deep layer mid to upper level trough approaches the area. && .PRELIMINARY POINT TEMPS/POPS... AEX 68 87 66 80 / 0 20 50 90 LCH 72 84 69 80 / 0 30 50 80 LFT 71 87 71 83 / 0 10 20 80 BPT 73 82 71 81 / 0 40 60 70 && .LCH WATCHES/WARNINGS/ADVISORIES... LA...Wind Advisory until 7 AM CDT Sunday for LAZ027>033-044-045-055- 073-074-141>143-152>154-241>243-252>254. Coastal Flood Advisory until 5 PM CDT this afternoon for LAZ073- 074-241-252>254. Coastal Flood Warning from 5 AM to 5 PM CDT Sunday for LAZ073- 074-241. Coastal Flood Advisory from 5 AM to 5 PM CDT Sunday for LAZ252>254. TX...Wind Advisory until 7 AM CDT Sunday for TXZ180-201-259>262-515- 516-615-616. Coastal Flood Advisory until 5 PM CDT this afternoon for TXZ615- 616. Coastal Flood Warning from 5 AM to 5 PM CDT Sunday for TXZ615- 616. GM...Small Craft Advisory until 7 PM CDT Sunday for GMZ430-432-435- 436-450-452-455-470-472-475. && $$ SHORT TERM...08 LONG TERM....05 AVIATION...08