Area Forecast Discussion
Issued by NWS Lake Charles, LA
Issued by NWS Lake Charles, LA
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062 FXUS64 KLCH 290241 AFDLCH Area Forecast Discussion National Weather Service Lake Charles LA 941 PM CDT Sun Apr 28 2024 ...New UPDATE... .UPDATE... Issued at 928 PM CDT Sun Apr 28 2024 Wind Advisory has expired for portions of Acadiana. However, kept the Advisory for Cameron Parish and expanded to include Calcasieu Parish, and Jefferson and Orange Counties as sustained speeds remain elevated around 20 MPH with gusts between 30 and 35 MPH. Advisory should expire by midnight, with winds expected to gradually diminish. Otherwise, refreshed PoP/Wx grids to reflect recent radar trends and latest guidance, but overall changes were not too extravagant. Still expect the cluster of convection, which has been parked just NW of our area for about an hour, to begin to propagate E/SE into our CWA late this evening into overnight. 24 && .UPDATE... Issued at 701 PM CDT Sun Apr 28 2024 A quick update to adjust headlines, removing the Coastal Flood Warning/Advisory and including the newly issued Tornado Watch for Tyler, Jasper, Newton Counties and Vernon Parish. Conditions remain conducive for severe storms later this evening into overnight as a potent midlevel shortwave moves into the region. Area radars show multiple clusters of strong to severe storms from roughly Marshall TX southwest to near Madisonville TX. CAM guidance is a mixed bag of solutions (none seem to be very well initialized), but a general consensus suggests that the storm clusters will lift NE this evening, with a general eastward progression of the entire system. Outside of a few showers or an isolated storm forming in advance of the main group of storms, the stronger convection is expected to enter our northwestern zones between 10 PM and midnight. Damaging wind gusts will be the main threat with any severe storms, but a few storms could produce an isolated tornado or two along with 1+ inch hail. Heavy rainfall will be the other concern overnight and a Flash Flood Watch remains in effect. 24 && .SHORT TERM... (Tonight through Tuesday night) Wx map shows surface high pressure off the East Coast and a low pressure trough across the Central Plains southward to Central Texas. Over our region, the pressure gradient is slowly relaxing, allowing for winds to diminish for all areas except the immediate coastal parishes. Thus, have trimmed back the Wind Advisory for SE TX and the I-10 corridor of Southern Louisiana. Minor coastal flooding continuing with values peaking between 1.5 to 1.8 feet Mean Higher High Water (MHHW) earlier this morning along the coast, and this afternoon across the Sabine and Calcasieu basins. Considering the duration of these southeast winds keeping tides 1-2 feet above astronomical tide over two days now, sufficient infiltration into the marshes and low lying coastal areas have likely occurred. Thus, will keep the ongoing Coastal Flood Warning for Southern Jefferson & Orange Counties and Cameron & Southern Calcasieu Parishes. Further east across coastal Vermilion, Iberia, and St. Mary Parishes, tides reached 1.5 feet Mean Higher High Water (MHHW) during the times of high tide. Thus, kept the ongoing Coastal Flood Advisory. With southeast winds expected to diminish before next high tide cycle, lower tides are expected. Therefore, the Coastal Flood Warnings and Advisories will not be reissued for Monday. The approaching longwave mid to upper level trough over Central Plains southward to Texas expected to move slowly as the shortwave within the base of the trough ejects northeastward through Monday. Showers and thunderstorms have reformed across Central and Northeast Texas. This area is expected to move across Northeast Texas this evening, with development further southwest. This area is expected to either maintain or redevelop as an MCS into the overnight hours through Monday morning. Severe weather will be possible, with the greatest risk across Inland SE TX late this evening/early Monday morning. SPC has Enhanced Risk for Tyler & Northern Jasper, and Slight Risk for remainder of area into Central and Southern Louisiana, expect Marginal Risk over Lower Acadiana. All modes of severe weather will be possible. The other item will be the expected rainfall of 3 to 5 inches with locally higher amounts through Monday evening. This areal extent has shifted southward, thus have extended the Flood Watch southward as well to include all of Southeast Texas and along the I-10 corridor northward across Central and Southern Louisiana. Did not include Lafayette parish and the remainder of Lower Acadiana as the totals here at this time only ranging from 1.5 to 2.0 inches. Expect lingering moisture and lift to generate scattered showers and thunderstorms for Tuesday, with chances around 30-40%. Otherwise, south to southeast winds and above normal temperatures expected to continue. 08/DML && .LONG TERM... (Wednesday through next Saturday) Ample moisture will remain in the area during the mid to late week period. No significant system is expected over the area Wednesday or Thursday, however with the lack of any ridging locally and weak disturbances aloft passing to the north, isolated to scattered mainly diurnal showers and storms will be possible. Friday into the weekend a weak front may move into the area. This boundary may provide an uptick in coverage before washing out or lifting back north late in the weekend. 05 && .AVIATION... (00Z TAFS) Issued at 644 PM CDT Sun Apr 28 2024 A weak frontal boundary will slowly approach the area from the west this evening increasing showers and thunderstorms ahead of it as it does so. Ceilings will gradually lower to IFR early Monday morning. A squall line will eventually form and push across the region from West to East early Monday morning. Visibility reducing heavy rainfall and strong, gusty winds can be expected in the vicinity of storms. Precip will gradually come to an end from west to east Monday afternoon. Away from storms, gradient winds will continue to gust into the mid 20 knot range tonight and tomorrow morning before relaxing during the afternoon. && .MARINE... Elevated winds and seas will continue this evening, but slowly subside after Midnight as the pressure gradient relaxes. Chances of showers and thunderstorms will increase tonight through Tuesday morning as the surface trough and deep layer upper level trough approaches the area. By Tuesday, onshore flow expected for the remainder of the period with a chance of showers and thunderstorms. 08/DML && .PRELIMINARY POINT TEMPS/POPS... AEX 66 78 64 85 / 70 90 20 40 LCH 69 80 69 84 / 70 90 20 40 LFT 71 79 69 85 / 40 90 40 50 BPT 71 83 70 84 / 80 90 20 40 && .LCH WATCHES/WARNINGS/ADVISORIES... LA...Flood Watch through Monday evening for LAZ027>033-141>143- 241>243. Wind Advisory until midnight CDT tonight for LAZ073-074-141-241. TX...Flood Watch through Monday evening for TXZ180-201-259>262-515- 516-615-616. Wind Advisory until midnight CDT tonight for TXZ515-516-615-616. GM...Small Craft Advisory until 1 AM CDT Monday for GMZ430-432-435- 436. Small Craft Advisory until 1 PM CDT Monday for GMZ450-452-455- 470-472-475. && $$ SHORT TERM...24 LONG TERM....05 AVIATION...66