This is RexBlog, not Rex Block

Typically, I think it’s amusing when I discover something named Rex. This isn’t one of those times.

Typically, I think it’s amusing when I discover something named Rex. (Like hotels, for instance.) This isn’t one of those times.

It doesn’t sound good. (However, it does sound like a great name for an ad-blocking app.)

News Item (via: CNBC) | Hurricane Joaquin and Rex Block to Bring Life-Threatening Floods

Explainer | [via: National Oceanic and Atmospheric Administration (PDF)]

In meteorology, blocking happens when centers of high pressure and low pressure set up over a region in such a way that they prevent other weather systems from moving through. While the block is in place other systems are forced to go around it.

Blocks can remain in place for several days, resulting in monotonous weather for locations under the block.

The “rex block” is named after Dr. Daniel F. Rex, who discovered and analyzed the pattern in 1950. Dr. Rex was a Commander in the Office of Naval Aerology and one of the founding members of today’s National Centers for Environmental Prediction.

Rex blocks are characterized by a high pressure system located immediately north of a low pressure system. These systems are usually analyzed aloft, around heights of ten to twenty thousand feet above the ground.

Air circulates clockwise around the east and south sides of the high to the north, and then turns to the south to go around the west and south sides of the counterclockwise-turning low to the south. Because the flow of the air is basically north-south, there is very little eastward progression of the system.

Rex Block Weather

Unsettled, stormy weather is usually found near the low pressure while dry conditions are typical with the high pressure. Strong, particularly persistent rex blocks can cause flooding in the southern part of the block and short-term drought in the north.

(Thanks: Lewis)