Area Forecast Discussion (AFD)
Issued by Huntsville, AL (HUN)
699 FXUS64 KHUN 220236 AAB AFDHUN Area Forecast Discussion...UPDATED National Weather Service Huntsville AL 836 PM CST Tue Nov 21 2017 .NEAR TERM...(Tonight) Issued at 819 PM CST Tue Nov 21 2017 Some light showers have developed aloft ahead of an approaching front that is currently pushing southeast into northwestern Tennessee. However, below 700 mb very dry air is in place, so do not expect this to reach the ground. Even in northeastern Alabama no rainfall is expected, where surface temperatures have dropped to dewpoint values and some isolated fog has developed (mainly in/near the Fort Payne area). Light to calm winds should continue in northern Alabama and southern middle Tennessee this evening. Temperatures have dropped into the lower to mid 40s in most locations. Very light winds will likely continue through around or just after midnight, when they should become stronger and be between 5 and 10 mph. Raised lows a bit from previous forecast, given the expected increase in winds and cloud cover expected. Lows in the mid to upper 30s look reasonable in many areas, with some lower 40s possible near/southeast of a line from Scottsboro to Cullman. .SHORT TERM...(Wednesday through Friday night) Issued at 257 PM CST Tue Nov 21 2017 The busiest travel day of the year will feature mostly sunny skies but colder conditions in the wake of the frontal passage. After mild conditions today, highs on Wednesday will barely reach the lower 50s. NW winds will increase into the 5-15 mph range, making for almost "brisk" conditions in comparison to today. With colder air more entrenched, another cold night Wednesday night with lows in the upper 20s and lower 30s. Thanksgiving 2017 will warm up a tad more Wed, with highs warming into the mid 50s. Normal high temperatures for reference on the 23rd are around 61 in Huntsville and 60 at Muscle Shoals. After a chilly Thursday night with lows around freezing, dry weather will continue for the Friday and Saturday time frame. Highs on Friday should rise near 60, and the lower 60s during Saturday. .LONG TERM...(Saturday through Monday) Issued at 257 PM CST Tue Nov 21 2017 This weekend, we can be thankful for the lingering dry and cool conditions, especially if traveling. Southerly flow at the sfc will help Saturday's high temps warm up towards 60 degrees. Northwesterly flow aloft will persist as a ridge remains anchored across much of the western half of the U.S and a broad trough across the eastern half. A shortwave will slide southeast out of the Northern Plains Friday night into Saturday as the sfc low stays north of the Great Lakes. The associated cold front will sweep into the area by Saturday afternoon. The front will bring an increase in cloud cover but no rainfall. Temps will fall into the mid 30s Saturday night with cold air advection and cloud cover moving back out. Broad sfc high pressure building into the region will tighten the pressure gradient to increase CAA on Sunday and with northwesterly flow aloft still in place, Sunday's high temps will be around 10 degrees cooler than Saturday. Look for highs in the lower 50s and overnight lows in the upper 20s/lower 30s. On Monday, southeasterly winds return as the sfc high and ridge shift a little eastward, but will not see a big improvement in temps. && .AVIATION...(For the 00Z TAFS through 00Z Wednesday evening) Issued at 527 PM CST Tue Nov 21 2017 Light winds are expected this evening, before increasing ahead of an approaching cold front after midnight. Expect winds to become northerly between 5 and 10 knots then and continue to increase around daybreak on Wednesday. Gustier northerly winds to around 17 knots are expected on Wednesday after 15Z, as mixing occurs. VFR conditions are expected throughout the TAF period for both terminals. && .HUN WATCHES/WARNINGS/ADVISORIES... AL...NONE. TN...NONE. && $$ NEAR TERM...KTW SHORT TERM...RSB LONG TERM...JMS AVIATION...KTW For more information please visit our website at weather.gov/huntsville.