First, There was the Derecho
Then, we met the Polar Vortex
Now, the Rex Block arrives?
*It's the latest in a line of meteorological nomenclature that will shoot to prominence courtesy of social media* AND if it plays out, our weather should be cooler than average next week. And it might even produce daily heavy-raining thunderstorms that move from SW to NE.
So, what is this "Rex Block" that we're talking about?
The "block" is the huge, strong high pressure that will greatly alter the typical jet stream pattern. Computer models are now consistently showing a stable area of high pressure at the 500mb level (roughly 2 miles up), sitting above a cool trough of low pressure directly to its south.
As seen in the CPC forecast above for July 29-August 4, This would bring below average temperatures for much of the country. It's much more likely that it'll be chilly in the plains and great lakes-- we might be just a bit cooler than average vs. chilly. The cold air from Central Canada would have an unimpeded (and quick) trip south.
What about rain? With a cold pool of air aloft, it wouldn't take much sun to form towering clouds and daily storms. A quick drop in temperature with height means an unstable environment (therefore clouds and rain).
Let's watch together... and see if it materializes!
-post by Andrew Freiden 7/22/2014