000 FXUS64 KBMX 200731 AFDBMXArea Forecast Discussion National Weather Service Birmingham AL 231 AM CDT Sat Sep 20 2025
...New SHORT TERM, LONG TERM...
.SHORT TERM... (Today through Sunday) Issued at 219 AM CDT SAT SEP 20 2025
Upper level flow through the weekend will have a largely zonal component. While not keeping the Gulf completely cut off from moisture return, this flow pattern should help to keep deep moisture at bay, which will in turn keep diurnal convective development to a minimum. Having said that, the synoptic global models and ensemble based model blends have apparently been having a hard time with daily thunderstorm development as of late. Will therefore hold onto the inherited 20 percent POPs over the weekend. And despite the slight uptick in shower and thunderstorm activity over the last few days, the ground is still quite dry across central Alabama. This will help to continue the trend of abnormally high afternoon temperatures.
/61/
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.LONG TERM... (Sunday night through next Friday) Issued at 219 AM CDT SAT SEP 20 2025
The big story in the long term is the development of a rather significant upper level trough in the eastern half of the country in the middle to end of next week. While the global models all have varying versions of how that trough develops and evolves, they do agree on the general idea of a cold front passage in the late Wednesday to Thursday-ish time frame. Such a cold front passage is likely to bring enhanced rain chances during the same time frame, followed by a moderation of the warm temperatures we`ve seen lately.
/61/
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.AVIATION... (06Z TAFS) Issued at 1219 AM CDT SAT SEP 20 2025
VFR conditions expected across area TAF sites through the next 24 hours. I don`t see anything obvious in the model that suggests fog will become an issue overnight. Scattered CU is expected to develop during the heating of the day on Saturday. While isolated showers/storms may develop once again, coverage should stay around 20 percent or less. Not high enough confidence at any specific terminal to include PROB30 at this time. Light winds.
/61/
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.FIRE WEATHER...
MinRH values will continue to stay in the 30-40% range through the weekend, with low end rain chances remaining in the forecast. More organized rain chances are possible later in the week, but the scope of that remains to be seen. Otherwise, look for drought conditions to persist across the region.
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.PRELIMINARY POINT TEMPS/POPS... Gadsden 93 66 92 65 / 20 20 20 10 Anniston 91 67 89 67 / 20 20 10 10 Birmingham 94 70 92 69 / 20 20 20 10 Tuscaloosa 95 69 93 68 / 20 10 20 10 Calera 94 69 92 68 / 20 20 10 10 Auburn 92 69 89 68 / 20 20 0 0 Montgomery 94 69 92 68 / 20 10 10 0 Troy 93 67 91 66 / 20 0 10 0
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.BMX WATCHES/WARNINGS/ADVISORIES... None. &&
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SHORT TERM.../61/ LONG TERM..../61/ AVIATION.../61/
NWS BMX Office Area Forecast Discussion