As I was looking at the data earlier this week for the end of this week, I said to myself the forming upper low on Friday looks familiar. So, since we know we are on roughly a 50 day cycle, I said "lets see, Friday is June 27th, so 50 day priors to this date is May 8th". I looked back at the maps and was not surprised to find this storm. It actually matched up well with May 10th, well within the range of the 50 day cycle. Below, I will post the 500mb chart from a blog Gary did on May 9th to the forecasted 500mb chart for Friday night. It is truly amazing.
On May 10th a potent trough dug into Iowa forming a deep closed low. Severe weather occurred across southern KS & MO with Iowa getting pounded by heavy rain. On June 27th a potent shortwave is to dig south out of Canada into northern Minnesota & form a closed low. Severe weather & heavy rain are the result across the Midwest. The only difference between May 10th & June 27th is that the upper low now is further north, as you would expect during summer with a weaker & retreated jet stream.
500 MB CHART FROM GARY'S BLOG MAY 9TH:

500 MB FORECAST FOR FRIDAY NIGHT JUNE 27TH:

So, to us in the NBC Action Weathe Plus forecast center it is obvious the system for Friday June 27th, is nearly the same as the one about 50 days ago. Again, it is just further north & slightly weaker as it is summer & not early spring.
This being said, what does this mean? Well, back on May 10th it was the beginning of the Midwest flooding as a very active pattern set in for much of May into early June. We feel this will be the case again, minus the crazy severe weather as a weaker, summer version will takeover. This still could mean very heavy Midwest rain events with some severe weather. We do expect a 3-6 day break in the active weather following the Friday storm as cooler, more stable air takes over along with a ridge. Yes, there was a ridge May 11-14, so even that is repeating.
So, more Midwest flooding is possible in July, which means more crop losses, which means even higher commodity prices, which could mean even higher prices at the grocery store. Wonderful?!?!?!
I do seminars at the Kansas City Board of trade, & there is concern over all of the weather problems. Lets hope the flooding is not as bad this time around, but the LRC is a powerful tool when used correctly.
Also, tonight we are monitoring big T-Storms near I-70 west of Topeka. We feel a disturbance will track out of Colorado into Kansas, helping to create a decent sized MCS for our area early Friday morning. We are not totally sure of this, but we feel pretty confident at this time. Once again, some areas may get a deluge, while other areas have a few drops.
Have a good night,
Jeff Penner