Data pix.

Monday Afternoon, January 27, 2020
Chief Meteorologist Jason Simpson

Light rain and cool days this week

Rain moved out early Monday leaving a slow-to-clear cloud deck, but the blue sky finally appeared from behind the gray! Drier, cooler air moving in this evening clears the sky for now, but the chilly air over wet ground likely means some fog develops early Tuesday morning. Watch out for dense fog in the usual foggy spots on calm, clear and cold mornings.

There’s a small chance of some ‘freezing fog’ in a few areas; that’s fog that develops where the temperature drops below freezing. The fog droplets come in contact with a surface and freeze; that can make slick spots on bridges and make it difficult to open car doors! Be on the lookout for any such issues early Tuesday, but Tuesday afternoon looks pretty nice: a fair sky, a light northeast wind, and a high temperature around 51-56°F by 3 PM.

More showery weather ahead: January’s rain has been impressive, but the over-all total of 7.72″ (3.61″ above average) won’t grow much before the stroke of midnight on the 31st. We only expect around 0.05″ to 0.15″ of rainfall in two waves this week:

  • The first wave of showers begins late Tuesday and passes through Wednesday. That rain looks light, but it will keep it chilly and damp on Wednesday: highs in the 40s under a cloudy sky.
  • The second wave of showers moves in on Friday with the ‘heavy’ rain staying well south of the Tennessee Valley region. Expect around 0.05″ to 0.10″ of rain with that round of on-and-off showers Friday and Friday night.

The unsettled nature of the weather pattern (day-to-day showers and clouds) keeps the temperature a little cooler than average by day and a little milder than average at night.

By the way, January’s average temperature fell from 10.5°F above average on the 18th to 5.4°F above average on the 26th. That’s quite a drop! The last week of chilly weather has balanced a lot of the early-month warmth.

Looking toward the weekend: Need a weekend to dry out for a change? We’ve got one coming up! Friday’s rain moves out very early Saturday morning; since most of the day will be dry, we have a 0% chance of rain in the forecast for Saturday. We’ll start cool and get nice in the afternoon! Expect a high in the mid-50s.

Sunday looks even better: highs in the lower 60s after a chilly morning.

Big warm-up ahead: We’re projecting upper 60s and lower 70s for the first part of next week! A huge warm-up brings temperatures up to spring-like levels for a few days to begin February.

That’s not likely the end of winter, though. The pattern sets up to bring in some seriously cold air again between February 4th and 14th. We’ll see how cold it gets, but it certainly looks cold enough to know we’re not quite finished with this season yet.


Tennessee Valley Forecast:

THIS EVENING: Mostly clear and cool. Dry. Temperatures drop into the 40s after sunset with a light northwest wind.

OVERNIGHT:  Patchy dense fog, some spotty areas of freezing fog where temperatures are able to drop below 32°F. Most communities cool to around 33°F to 38°F by morning.

TUESDAY:  Foggy in the morning. Becoming partly to mostly cloudy in the afternoon. Cool and dry. Highs in the low-50s. Wind: NE 3-9.

TUESDAY NIGHT:  Cloudy and chilly. Some light showers possible. Lows in the upper 30s.

WEDNESDAY:  Scattered showers passing by through the day. Most of the rain looks light: only around 0.05″ to 0.10″ expected. Highs in the upper 40s. Wind: SE 5-10.

WEDNESDAY NIGHT:  Rain showers ending. Cloudy and cool. Lows around 40. Wind: Light North.

THURSDAY:  Partly cloudy. Cool and dry. Highs in the lower 50s. Wind: NNE 5-10.

THURSDAY NIGHT:  Partly to mostly cloudy. Cool. Lows in the lower 40s.

FRIDAY:  Scattered light showers. Cloudy and cool. Highs in the lower 50s. Wind: SE 5-10.

FRIDAY NIGHT:  Mostly cloudy. Chilly. Lows in the lower 40s.

SATURDAY:  Sunny, dry and mild. Highs in the mid-50s. Wind: W 10-15.

SATURDAY NIGHT:  Chilly and dry. Lows in the mid-30s.

SUNDAY:  A sunny, warmer day. Highs in the lower 60s. Wind: WSW 7-14.

MONDAY:  Warm and dry! Mostly sunny. Highs 65-70. Wind: SW 6-12.

TUESDAY:  Another very warm day! Highs in the low-70s. Wind: S 10-15.

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