The Sunday Washout Never Materialized — What Changed?

If you followed the forecast throughout the week, you probably noticed something very different when you woke up Sunday morning: the soaking rain that once looked possible across the region never really materialized.

Instead, Rowan, Davie, Davidson and Cabarrus counties are dealing with a cloudy, cool and occasionally damp Sunday. There may still be some light rain or drizzle around this afternoon and evening, but the widespread soaking rainfall once on the table is no longer expected.

So what happened?

The Forecast Started Changing Before Sunday Arrived

This wasn’t a sudden change Sunday morning.

As we moved closer to the weekend, rainfall amounts began trending downward. The timing, position of the front and development of the Carolina wedge all became increasingly important.

By Sunday morning, rain probabilities had decreased further across portions of the region.

For Rowan County, there is now only a 30% chance of showers, mainly late this afternoon. Davie County is down to just a 20% chance. Cabarrus County carries a 30% chance late this afternoon and early evening, while Davidson County’s point forecast does not currently include a measurable rain chance for today.

That is a considerably different picture from the wetter possibilities we were watching earlier in the week.

The Carolina Wedge Changed the Setup

The Carolina wedge — also known as cold air damming — played a major role.

Cooler, more stable air pushed into the Piedmont from the northeast behind a backdoor cold front. That shallow layer of cool air became established near the surface and changed the environment considerably.

Instead of having an atmosphere supportive of widespread heavier showers and thunderstorms, we ended up with a much more stable setup.

That’s why temperatures are struggling today. Highs are only expected to reach around 71° in Rowan, Davie and Cabarrus counties, while Davidson County may only reach about 67°.

It is also why thunderstorms are generally not a concern across our region today.

Plenty of Moisture — But Not Much to Make It Rain

There is certainly no shortage of moisture in the atmosphere.

What is missing is strong enough forcing to efficiently turn all of that moisture into widespread, sustained rainfall across our area.

That distinction is important.

A very moist atmosphere does not automatically mean heavy rain. You still need mechanisms capable of lifting that moisture and producing precipitation.

Today, those ingredients simply aren't lining up particularly well across our part of the Piedmont.

That leaves us with plenty of clouds and the possibility of occasional light rain or drizzle, but not the widespread soaking rainfall that appeared possible earlier.

So Is Sunday a Washout?

No.

That doesn't mean everyone stays completely dry.

Rowan County could see a shower late this afternoon. Davie County has a small chance beginning this afternoon. Cabarrus County could see some light rain late this afternoon into early evening, and occasional drizzle remains possible around the region.

But if you were expecting hours of steady, soaking rain throughout Sunday, that isn't what the latest forecast supports.

In many locations, the clouds and cool temperatures will be considerably more noticeable than the rain.

Fog Becomes the Next Concern

As any remaining light rain or drizzle fades tonight, plenty of moisture will remain trapped close to the ground.

That creates another issue: fog.

Patchy fog is expected to develop overnight across portions of the region, and some locations could experience locally dense fog toward Monday morning.

Anyone traveling early Monday should be prepared for rapidly changing visibility, particularly in the usual fog-prone locations.

Then the Weather Pattern Flips

Once we get through Monday morning, our weather improves considerably.

The wedge begins breaking down and much drier air moves into the region from the northwest. Clouds should gradually give way to sunshine Monday, with afternoon temperatures recovering into the upper 70s.

Then we get a genuine stretch of fall weather.

Tuesday will be sunny with highs around 70° to 71° across much of the region. Tuesday night gets chilly, with forecast lows ranging from around 43° in Davidson County to the mid-40s elsewhere.

Sunshine continues Wednesday and Thursday, with temperatures gradually climbing back toward the upper 70s and around 80° by Thursday.

Humidity will also be considerably lower.

The Bottom Line

The Sunday washout never materialized because the atmospheric setup evolved.

The front settled farther south, the Carolina wedge established a cooler and much more stable air mass across the Piedmont, and the ingredients needed to produce widespread heavier rainfall did not come together over our region.

That doesn't mean the earlier forecast was ignored or that something suddenly went wrong. Forecasting is a process of continually incorporating new observations and model data as an event gets closer.

And sometimes those changes are substantial.

Today is one of those examples.

Sunday will remain cloudy, cool and occasionally damp across the region, with some light rain or drizzle still possible. But the widespread soaking rain once on the table is gone.

And after we get through the clouds and fog Monday morning, several days of beautiful fall weather are waiting on the other side.