Area Forecast Discussion
Issued by NWS Houston/Galveston, TX
Issued by NWS Houston/Galveston, TX
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881 FXUS64 KHGX 150821 AFDHGX Area Forecast Discussion National Weather Service Houston/Galveston TX 321 AM CDT Sun Sep 15 2024 ...New SHORT TERM, LONG TERM, MARINE... .SHORT TERM... (Today through Monday Night) Issued at 318 AM CDT Sun Sep 15 2024 Ridging over Texas will continue to bring relatively benign weather across the region through early next week. A diffuse boundary spanning NW-SE near Lufkin will slowly intrude into our area during the day today. This comes as a result of the midlevel remnants of Francine sagging southward over the Lower Mississippi River Valley. By this afternoon, this boundary will be set up along a line from around College Station to Houston, serving as a focus for convection as weak impulses pass overhead. CAMs are much more optimistic with storm development this afternoon than previous days, especially given the lowering heights and reduced subsidence. Look for scattered to isolated showers and storms this afternoon, with activity later tapering off this evening. Decreasing heights & thicknesses may bring temperatures down slightly, though highs will still be in the upper 80s to upper 90s. Overnight lows will be in the 70s, with isolated spot possibly dropping below the 70 degree mark. On Monday, the remnants of Francine begin to interact with a non- tropical low off the Southeastern coastline. This low will pull in the remnants of Francine, shifting further east/northeast and allowing the upper ridge over Texas shift eastward. However, 850mb flow shifts northerly, funneling cooler 850mb temperatures into the area. This will lead to slighter cooler highs, though by in large they`ll still be in the upper 80s to upper 90s across SE Texas. With greater influence from the the ridge aloft, rain chances look slim for Monday compared to that of today. 03 && .LONG TERM... (Tuesday through Saturday) Issued at 318 AM CDT Sun Sep 15 2024 An omega blocking pattern will remain in place over the central CONUS with the ridge axis extending just to our northwest. This pattern will keep the region relatively dry with near to above normal temperatures. Despite strong subsidence, southerly surface winds and low-level moisture (mainly along the coast) could potentially result in a few showers/storms along the sea breeze Thursday and Friday. A change in the upper-level pattern is expected towards the end of the long term as a deepening low develops over the Pacific Northwest and moves eastward into the Rockies. At the same time, another Rex Block pattern develops over the eastern CONUS with a high pressure over the Great Lakes and a low pressure over the southeastern CONUS. Locally for SE TX, an increase in mid to upper level vorticity maxes ahead of an approaching surface frontal boundary will lead to increasing rain chances after Saturday. It is too far out for specific details as both , deterministic and its ensemble means are not in good agreement on phase and strength of this FROPA. Given uncertainty, have kept PoPs from 15 to 20% Sat and Sun. JM && .AVIATION... (06Z TAF Issuance) Issued at 1100 PM CDT Sat Sep 14 2024 Light, variable winds will continue through the night with the potential for patchy fog bringing visibilities down to 4-6mi at times. There will also be SCT to BKN clouds at around 1500ft through the predawn hours. The patchy fog and MVFR CIGs will dissipate shortly after sunrise. VFR conditions will prevail through the day on Sunday, but there will be scattered showers and isolated thunderstorms developing across the area during the afternoon and into the evening. Confidence is low on exactly where the storms will develop, so kept wording to PROB30 TS at this time. Southerly winds will prevail through the day, but will be variable near storms. The shower and storm activity will wane by 2z with light and variable winds returning for Sunday night. Fowler && .MARINE... Issued at 318 AM CDT Sun Sep 15 2024 Light south to southwest winds and low seas continue today. Winds will briefly shift to the north-northwest this evening/tonight ahead of a passing weak boundary. Isolated showers/storms will also be possible during this time frame. Light to occasionally onshore winds resume by Monday afternoon. Winds will vary between southwesterly and southeasterly throughout the day each day. Isolated rain/storms are also possible with the best chances towards the end of the week and into the weekend. JM && .PRELIMINARY POINT TEMPS/POPS... College Station (CLL) 98 72 94 71 / 40 30 0 0 Houston (IAH) 97 75 94 75 / 40 30 0 0 Galveston (GLS) 88 77 87 76 / 20 20 10 0 && .HGX WATCHES/WARNINGS/ADVISORIES... TX...None. GM...None. && $$ SHORT TERM...03 LONG TERM....JM AVIATION...Fowler MARINE...JM