Weather blog: colder changes on the way

FLORIDA – The weather has had its ups and downs this winter.

Some days were above normal, others below. This is true for much of the Central and Eastern United States, but the other shoe is about to fall.

The overall weather pattern in the Northern Hemisphere will shift slightly from next week. The final result appears to be colder than average in the coming weeks.

What to expect

We’ve had some cool weather lately, but the dip in the jetstream that allowed for the cooling didn’t really bore the bitterly cold air that gathered at Hudson Bay in Canada and crossed the North Pole to Northeast Europe and North Asia.

Things are about to change.

We are seeing signs of a high pressure ridge that will build across the North Pacific next week. This will allow a large trough to carve out across 2/3 of the eastern United States.

Due to the expanse of the ridge, things generally won’t move much, so the pattern will essentially lock in place.

In the short term, a powerful storm system will develop across the plains later this week through the weekend, allowing a final bit of warmer air to be drawn northward southeast. Above average temperatures are here on Saturday.

The storm system will move northeast to northeast, and a cold front will pass through southeast and Florida on Sunday morning.

We will have some rain and storms for the front early in the Sunday, but the cold air will settle behind that, bringing us a fairly sharp cold wave for Sunday afternoon through Monday.

Temperatures can be 20 degrees below normal for a day and a half.

This storm system will literally open the door for the cold air over Canada to march southward into the U.S. in the middle of next week.

It will make its way southwest in the Southern Plains by mid-week. When that happens, we’ll be warming back to near normal here in Florida from Tuesday to Wednesday.

As another storm system develops within this dip in the jetstream, the warm ridge above the Pacific and the far west of the US builds up, creating a much wider trough, or dip in the jetstream, over the eastern 2/3 of the the US can move in.

This type of pattern is much colder than normal weather in these areas, along with an active assault course that comes from the western Gulf of Mexico and then enters the Great Lakes, Northeastern, or Mid-Atlantic states.

As each system evolves, only slightly milder weather moves to Florida. Otherwise, the cold air is drawn in again when passing through each system.

Some long-term indications are that this general pattern should take us well into February and possibly beyond. That said, there will be a few days that will have a chance to warm up slightly, but this pattern will be beneficial for much colder weather for a while.

After all, it is still winter.