Area Forecast Discussion
Issued by NWS Huntsville, AL
Issued by NWS Huntsville, AL
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062 FXUS64 KHUN 171050 AFDHUN Area Forecast Discussion National Weather Service Huntsville AL 550 AM CDT Tue Sep 17 2024 ...New AVIATION... .NEAR TERM... (Today) Issued at 158 AM CDT Tue Sep 17 2024 The main headline for the next several hours will be fog. Current satellite and surface observations show mostly clear skies with 1-3 degree dewpoint depressions. The clear conditions will support additional radiational cooling allowing temps to drop a few more degrees. Even with lower dewpoints in NW AL, temperatures are forecast to be within 0-1 degrees of their dew point. The low dew point depressions and light winds along with lingering moisture from weekend rainfall will be incredibly supportive for fog during the early morning hours. We will be monitoring conditions closely should a Dense Fog Advisory be needed. Any fog that does form will likely dissipate a few hours after sunrise as winds gradually pick up from the north. Today, we will find ourself right at the intersection of high pressure to the west and low pressure to the east as a tropical low over the Carolina`s pushes inland. The high pressure will support clear and dry conditions in NW AL with high temps in the high 80s. NE AL and southern middle TN will see slightly different conditions. The very western extent of the tropical low will be present over NE AL and support more cloud cover and very low (5-10%) rain chances. This, in turn, will limit high temps to the mid 80s. && .SHORT TERM... (Tonight through Friday) Issued at 157 AM CDT Tue Sep 17 2024 The overall pattern will remain mostly unchanged through the short term forecast. The tropical low will begin to push back towards the Atlantic and maintain our high pressure influence both aloft and at the surface. This will support clear and dry conditions each day. A gradually warming trend will take place through the remainder of the week with temps rising into the low 90s by Friday. The clear and calm conditions paired with the saturated grounds from recent rainfall will support a fog concern for the next several nights. Conditions will be monitored each night should a Dense Fog Advisory be warranted. && .LONG TERM... (Friday night through Monday) Issued at 157 AM CDT Tue Sep 17 2024 High pressure will remain the dominating feature through the long term forecast. Mid level ridging will build in from the SW and remain through the weekend. While the overall trend will be clear and dry conditions with temps in the high 80s to low 90s, we will be monitoring any impacts from an upper low tracking east across the CONUS. Being on the eastern periphery of high pressure will place us in a NW flow regime marking a favorable pattern for SE expansion of clouds and rain from the parent low. While the current forecast is dry, we will be monitoring how these two features interact (NW flow from high pressure and low pushing east) over the next several days for any forecast changes. && .AVIATION... (12Z TAFS) Issued at 550 AM CDT Tue Sep 17 2024 Light winds and mostly clear skies will support VFR conditions through the day today. Late tonight after 6Z winds will calm and visibility reductions from fog is likely. Subsequent issuances of the TAFs will refine timing and intensity of fog. && .HUN WATCHES/WARNINGS/ADVISORIES... AL...None. TN...None. && $$ NEAR TERM...RAD SHORT TERM....RAD LONG TERM....RAD AVIATION...RAD