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Area Forecast Discussion (AFD)

Issued by Huntsville, AL (HUN)

FXUS64 KHUN 220236 AAB

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.





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at weather.gov/huntsville.