429 FXUS64 KOHX 230512 AFDOHXArea Forecast Discussion National Weather Service Nashville TN 1212 AM CDT Tue Sep 23 2025
...New AVIATION...
.KEY MESSAGES... Updated at 1206 AM CDT Tue Sep 23 2025
- Medium to high rain and thunderstorm chances through Thursday. Low threat for severe storms, a few could produce strong winds and heavy downpours.
- Minor flooding from heavy rain possible.
- Seasonal temperatures midweek, but latest trends show warm days returning by next week.
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.SHORT TERM... (Tonight through Wednesday Night) Issued at 1125 PM CDT Mon Sep 22 2025
After a very active Monday afternoon with spots of gusty winds and heavy rain, things settled down in the evening. But, a shortwave and mid level jet streak will help activity blossom again in the late Monday night hours. Locally heavy rain will be possible. Storms will be mostly elevated with very low risk for strong surface wind gusts. CAMs have been consistently showing a resurgence of activity in the late night, but placement has varied run to run, so confidence is low for exactly who will get the overnight downpours and rumbles.
Tuesday will be generally similar to Monday with a slight increase in shower and storm coverage. Once again a marginal risk (level 1 out of 5) for severe storms will be in place for localized damaging wind gust potential.
Tuesday night through Wednesday night, a consolidation of waves will form a deep upper trough along the Ms River Valley. The approach of this system will bring a swath of very deep moisture and lift across the area with periods of showers and storms. Midweek rainfall totals over 2 inches will be likely with some spots reaching 3 or 4 inches by daybreak Thursday. There will still be a low-end severe risk Tuesday night into Wednesday for localized gusty winds, but as precipitable water values climb well above normal, localized flood will be the greater concern. So far, flash flood guidance values have been quite high with dry soil absorbing a lot of the heavy downpours. But as episodes of rain continue, the heavy downpours will be more likely to cause flood impacts.
Unlike last week when we had hot days and cool nights, midweek highs will be limited by clouds and showers. But nights will be muggy and warmer than normal.
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.LONG TERM... (Thursday through next Tuesday) Issued at 1125 PM CDT Mon Sep 22 2025
As the band of deep moisture pivots ahead of the incoming trough, high rain coverage and downpours will focus over the Plateau Thursday, although all areas will keep showery conditions until a front passes late day.
Models have trended quicker with drying behind the front, but temps have trending warmer. So, we are looking at a good weekend, but not really fall-like. Nights look seasonably cool, but daytime temps will climb well above normal again. And regarding the dryness shown in our extended forecast- not a slam dunk. Many models show several days of dry wx this weekend through next week, but some members are closing off an upper low over the southeast then pulling some showers up our way early next week. Obviously, low confidence a week ahead.
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.AVIATION... (06Z TAFS) Issued at 1206 AM CDT Tue Sep 23 2025
Clusters of showers and scattered storms will move across the forecast area through the next 24 hours. Stronger cells will contain very heavy rainfall and localized wind gusts over 40KT.
Overnight, peak activity will occur 06Z-10Z. Conditions will be mainly VFR but storms will drop cigs/vsbys to MVFR. Coverage will be lowest 12Z-18Z, then trend upward again through the afternoon.
Outside storms, winds will be south to southwest mostly 5 to 8 KT.
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.PRELIMINARY POINT TEMPS/POPS... Nashville 86 70 84 68 / 60 60 100 90 Clarksville 87 68 84 65 / 60 70 90 70 Crossville 78 63 79 63 / 50 50 80 90 Columbia 84 67 83 67 / 60 50 100 90 Cookeville 80 65 80 65 / 50 60 90 100 Jamestown 79 65 79 65 / 60 60 90 90 Lawrenceburg 84 67 82 66 / 60 40 90 90 Murfreesboro 85 67 84 68 / 60 50 100 100 Waverly 83 67 81 64 / 60 60 90 70
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.OHX WATCHES/WARNINGS/ADVISORIES... None. &&
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SHORT TERM...13 LONG TERM....13 AVIATION.....13
NWS OHX Office Area Forecast Discussion