If you’re hoping for a nice Spring warm up, you’re probably going to have to wait at least another week and a half thanks to a very typical spring pattern that is expected to set up.
As we venture into next week we will likely experience what is called a blocking pattern in the atmosphere or more specifically an “Omega Block”. When a blocking pattern sets up, depending on where you are, you can either experience a nice area of high pressure and sunshine for several days straight, or in our case a stubborn low that will bring rain and below average temperatures. When you look for signs of an Omega Block all you need to do is look at an analysis of the potential jet stream for next week. Check out this map, two areas of high pressure over the Atlantic and Pacific Oceans form what looks like the greek letter Omega. In between these areas of high pressure is an upper level low that will bring colder than average temperatures and the chance for rain all week-long.
These two areas of high pressure act like book ends that force the low to progress VERY slowly across the country. Simply put when you have a slow-moving low = cloudy, cooler and rainy weather.
As this low develops Saturday and begins to move at it’s turtle pace this upcoming weekend it will bring what could be the worst outbreak of severe weather so far in 2014. The upper low will drive a strong jet stream flow deep into the Southern Uniter States, these strong jet stream winds will interact with Gulf moisture over the midwest making for a potentially explosive severe weather situation.
With this set up expected, it’s no surprise that a multi day severe weather is being anticipated by The National Weather Service. Here is their Saturday (Red) Sunday ( Purple) and Monday (Green) severe weather outlook. This could likely include a widespread outbreak of tornadoes.
Thankfully, as of now it looks like as this system develops the best dynamics for severe weather will stay well South and West of us here in West Central Ohio. But it does look like we’ll have to deal with the other side of this slow-moving system which means a cooler, cloudy and rainy last week of April. I’ll keep you updated!