WIND WHIPPED...

May 18, 2017

A potent spring storm slammed into the central Midwest Wednesday leaving a trail of high winds and hail. The track of the storm placed Iowa in the heart of the system. You can see the majority of the 205 severe weather reports were centered on the state. Winds were the biggest issue with a number of sites confirming gusts of 60-80 mph.

Now that the system has passed off to the east a significant pattern change is underway that will bring an extended period of below normal temperatures. Take a look at the 500mb jet stream flow May 25th. That is highly amplified and highly unusual for late May.

This will essentially close down the severe weather season for the the rest of May. I mean this is remarkable. Moisture and heat are completely cut-off from the Rockies to the Atlantic. I'm not sure I have ever seen such a deep trough this late in May. Look at what happens to temperatures the nest 15 days.

 

Here's the 0-5 day temperature departure.

 Now the day 5-10 departure.

And last but not least the 10-15 day departure.

The first real taste of the coming chill arrives Friday. Just look at the highs on the EURO. This may be a bit too low but I can tell you the sight of 50s (even some 40s) is not something I wanted to see. 

That chilly scenario results from east winds, clouds, showers, and a surface pattern that looks like this.

Also, to reinforce the idea of just how cool the pattern is, here's the snowfall forecast from the GFS. Aside from heavy snow in the Rockies, the model even shows snow in Minnesota. Heading into June that is far from normal.

As the cool surge heads south, Thursday's severe weather threat shifts to the Plains where a significant tornado outbreak is expected. The SPC has a rare moderate risk outlook in effect.

After 5 hours of severe coverage Wednesday, I'm thrilled to see that hot mess stay to the south! Roll weather...TS  

 

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© 2019 Terry Swails