Bow Echoes in Mississippi

There was a Marginal Risk of severe thunderstorms earlier today across the south. I did not post about it, and the threat has been reduced.

The conditions today did yield a long squall line.

Looking at the squall line, there are some neat things to notice. Across Mississippi, there are several bowing sections, called “Bow Echoes” where the squall line has pushed forward. The bow comes from the redirection of mid-level flow accelerating in pockets, called Rear Inflow Jets (RIJ). You can identify these by finding areas with lower reflectivities behind the main squall line. I have marked these on the image.

Also, looking at the vertical cross section of these storms, we see a large area of trailing precipitation behind the main core of the storm. Notice that the updraft is tilted forward.

There is a flood watch issued for parts of Mississippi. You can’t see the motion of this storm, but the storm is trailing a little bit east. Therefore, the rain keeps falling in the same areas, leading to the flood threat.

Thank you for reading this post.

All radar images are from GRLevel 2, which I highly recommend.

Advertisements

About highplainschasing

This blog is about my tales in storm chasing. My name is Seth Price and I am an instrumentation instructor at New Mexico Tech. My amateur radio call sign is N3MRA.
This entry was posted in NowCasting, Radar Imagery and tagged , , , , , , , . Bookmark the permalink.

2 Responses to Bow Echoes in Mississippi

  1. Matthew says:

    Just curious about your thoughts on why the updraft would be tilted forward.

    Liked by 1 person

    • Typically, the updrafts tilt in the due to the speed of the upper level winds. I’ve heard the 500 mb winds referred to as the “steering level” winds, as they drive the cloud tops downwind. This is why shear is such an important thing to track; higher shear means cloud tops are blown downwind, meaning the precipitation region and updraft are separated. This leads to longer-tracked storms.

      Like

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s