Rain exits, clouds and fog stay a while, then it just turns cold

A cold front passing by this evening sweeps out the rain and brings in drier, colder weather. Clouds hang on through the night; expect a gradual temperature drop from the upper 40s at 7 PM to the middle and upper 30s by daybreak Wednesday. Those clouds finally break apart by Wednesday afternoon with a high temperature between 45 (in the colder, higher elevations) to the lower 50s in Huntsville, Decatur and The Shoals.

Tuesday night & Wednesday morning

Tuesday night & Wednesday morning

What about seeing the Supermoon or the Geminid Meteor Shower? The odds aren’t in your favor.

We expect the clouds to be too thick for too long for good viewing; however, there will be some brief periods where the sky may clear for 30 to 60 minutes overnight allowing you to see some of the show.  The Supermoon may flood the sky with too much light for good meteor watching anyway, so given the clouds, fog and moonlight, this is one you may want to ‘pass’ on.

The air keeps getting colder as an Arctic ‘high’ moves southeast toward the Tennessee Valley Wednesday evening into Thursday; temperatures plunge to the mid-20s with a wind chill in the 10s by Thursday morning, and even under a sunny sky, we only expect highs between 35ºF and 40ºF on Thursday afternoon.

Crazy-looking weekend forecast: The Seven Day Forecast is supposed to show morning lows and afternoon highs, but what do you do when the high happens in the morning? Flip the numbers!

Much warmer, more humid air surges in here from Friday night through Saturday morning; that should kick off some scattered light rain on a breezy, warm day. Expect a high between 65 and 70 degrees Saturday afternoon; the wind may gust over 30 miles per hour at times (even with no rain and storms in the area).

More rain and storms move in late Saturday night. The period from about 10 PM Saturday to 6 AM Sunday features some very heavy rain and gusty winds, a limited ‘threat’ of thunderstorms, and a big temperature nose dive.

Sunday’s official high happens before 6 AM; after that, temperatures plunge toward the low-30s with a wind chill (feels like) around 15 to 25 degrees in the afternoon. Some of the rain early Sunday could end as some sleet or light freezing rain (mainly on elevated surfaces).

Midday Sunday precipitation type (image produced 5:36 PM Tue.)

Midday Sunday precipitation type (image produced 5:36 PM Tue.)

We do not expect any significant winter weather or widespread travel problems in Alabama or Southern Middle Tennessee on Sunday.

Healthy rainfall on the horizon: According to Alabama’s State Climatologist Dr. John Christy, most of the Tennessee Valley region needs between two and eight inches of rain to formally end the drought.

There’s some computer guidance that pushes us that way in the next 10-14 days!

Monday night’s run of the European (ECMWF) raised some eyebrows, and this morning’s GFS guidance follow suit. Most of us won’t be getting five to ten inches of rain, but there is certainly a very wet, stormy-looking pattern taking shape through Christmas.

Along the way, we’ll have some quick pops of very cold air for 24-48 hours, a mild day or two, a couple of warm days, and then see the temperature plunge again.

Need some specifics about the weekend or next week? They’re always online at WHNT.com/Weather and in the “Daily Forecast” section on Live Alert 19!

-Jason
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