Area Forecast Discussion
Issued by NWS Lake Charles, LA
Issued by NWS Lake Charles, LA
751 FXUS64 KLCH 202333 AFDLCH Area Forecast Discussion National Weather Service Lake Charles LA 633 PM CDT Sun Sep 20 2026 ...New AVIATION... .KEY MESSAGES... - Precipitation chances will increase but remain isolated through early week as moisture increases, but high pressure remains centered nearly overhead. - A weak "frontal" boundary will bring some drier air back into the region Wednesday through late week. && .DISCUSSION... (This afternoon through next Saturday) Issued at 1242 PM CDT Sun Sep 20 2026 Moisture is on the increase across the region today as high pressure slides to the east of the Mississippi Valley and a weak cold front drops into the central plains. A few showers have been noted over the coastal waters this morning and some of these have moved into Jefferson County and Cameron Parish. Even though moisture is on the increase, high pressure aloft over TX and LA will keep convection suppressed, outside of a few showers along the afternoon sea breeze. Moisture will continue to increase into Monday and Tuesday, however only isolated afternoon storms will be possible areawide both days as the ridge aloft remains in place. Late Tuesday into early Wednesday, a weak frontal boundary will move through the area and into the coastal waters. A drier airmass will again filter in with dewpoints falling back into the upper 50s well inland to around 70 at the coast. Much like the last weak boundary, high temperatures will remain above climo norms, but the drier airmass will keep heat index values close to the actual temp. Morning lows will be near climo norms for late September. Dewpoints will again increase next weekend as the flow turns back onshore with isolated showers possible again by Sunday. && .AVIATION... (00Z TAFS) Issued at 630 PM CDT Sun Sep 20 2026 VFR conditions ongoing and likely to prevail past the end of the forecast period. Some patchy fog could be possible very early tomorrow, however confidence remains low enough at this time to not include tempo grouping it in the TAFs. && .MARINE... Issued at 1242 PM CDT Sun Sep 20 2026 A light onshore flow will remain through late Tuesday. A weak cold front will move into the coastal waters early Wednesday with a light to moderate northeast to east flow remaining through the rest of the week. && .FIRE WEATHER... Issued at 1242 PM CDT Sun Sep 20 2026 A moderately moist airmass will remain in place through Tuesday as the flow remains light and southerly, however a weak cold front will push through the area Tuesday night or early Wednesday. Minimum relative humidities may fall into the upper 20s to mid 30s across interior areas by Thursday. && .LCH WATCHES/WARNINGS/ADVISORIES... LA...None. TX...None. GM...None. && $$ PUBLIC/FIRE/MARINE...05 AVIATION...87