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Area Forecast Discussion
Issued by NWS Nashville, TN
Issued by NWS Nashville, TN
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200 FXUS64 KOHX 202342 AFDOHX Area Forecast Discussion National Weather Service Nashville TN 642 PM CDT Sat Jul 20 2024 ...New AVIATION... .SHORT TERM... (Rest of today through Sunday) Issued at 1139 AM CDT Sat Jul 20 2024 Dew point temperatures are already in the low 70s for most around the area this morning with air temperatures not too far ahead with values in the upper 70s..Meaning our relative humidity values are rising. Current surface map shows the frontal boundary draped from the Carolinas all the way down to Texas with very slow northern movement. With that, showers have developed along the Alabama/Tennessee state border ahead of the boundary and continue to drift north/northeast. Do expect more widespread coverage across the Cumberland Plateau later this afternoon as that boundary treks into the area. For the remainder of middle Tennessee, the latest 12Z HREF solution shows scattered coverage filling in across the majority of the area this afternoon as daytime heating ramps up instability values. On the plus side, the threat for severe weather is very low. Mid-level lapse rates and shear values do no favor prolonged severe storms. A strong storm or two cannot be ruled out, though. Heavy downpours will be likely with storms today given the moisture-rich environment. Activity will dwindle down tonight, giving way to a cloudy and muggy night with lows in the low 70s. Patchy dense fog is likely early Sunday morning in the few hours leading up to sunrise. Sunday looks pretty similar to today with perhaps less coverage in showers and storms as the frontal boundary continues to lift out of the area. Assuming the boundary maintains a southwest to northeast movement, the better rain chances will exist along the Plateau again tomorrow. Again, very similar to today elsewhere with any scattered thunderstorms capable of producing heavy rain and frequent lightning. && .LONG TERM... (Sunday Night through next Saturday) Issued at 1139 AM CDT Sat Jul 20 2024 The weather pattern across Middle Tennessee will remain unsettled as we move into the new week. A very deep cut off low will traverse Canada this week, resulting in a troughing pattern lingering over portions of the midwest and the Ohio Valley. Southwesterly flow embedded within this trough will help to continuously stream in small disturbances through the week. No one day is jumping out in terms of severe weather, but Tuesday and Wednesday look to have a bit more activity than the other days as a cold front moves through in association with a shortwave trough. There will be a bit more forcing in place for storms to work with. Still, though, model soundings do not suggest much in the way of severe activity. The trough will finally dislodge by the end of the week with global models hinting at higher 500mb heights building in across the southeast by the weekend. Main concern for the upcoming week will be monitoring the potential for any flooding. Models keep dew point temperatures in the low 70s with high relative humidity values, thus PWAT values will be very healthy and conducive for heavy rain in any storms. That combined with the repeated rounds of showers and storms will increase the flooding threat this week. && .AVIATION... (00Z TAFS) Issued at 625 PM CDT Sat Jul 20 2024 A meso-low centered near the TN/AL/MS confluence has helped develop a frontal boundary across Middle Tennessee that is providing the focus for some ongoing convection. We expect the active weather to diminish considerably during the next couple of ours. Overnight, look for some radiation fog and low ceilings to develop, with low clouds persisting into Sunday morning. We also expect showers and storms to redevelop again tomorrow, mainly during the afternoon. && .PRELIMINARY POINT TEMPS/POPS... Nashville 71 89 71 89 / 40 60 50 60 Clarksville 68 86 69 85 / 20 40 40 50 Crossville 65 81 64 82 / 50 80 60 80 Columbia 69 89 68 89 / 40 70 40 60 Cookeville 67 84 66 82 / 40 70 60 80 Jamestown 65 81 65 82 / 40 80 50 80 Lawrenceburg 68 87 67 87 / 50 70 40 60 Murfreesboro 70 89 69 89 / 50 60 50 70 Waverly 68 87 67 86 / 20 40 30 50 && .OHX WATCHES/WARNINGS/ADVISORIES... None. && $$ SHORT TERM...Baggett LONG TERM....Baggett AVIATION.....Rose