Air Density Report w/ @Syracuseeee – 8.14.17


In this article I will break down the top teams and players that are affected the most by VMI and ADI today.  Many of you might ask what is VMI and ADI is so below I have written a brief description of what they mean and how they affect baseball games.

Air Density Report w/ Cuse

Visual Memory Index aka VMI in baseball is used to track how players perform under different air density’s. The easiest way to explain this is that depending on the weather temperature, humidity, or air density the batters swing will be affected.  You might ask yourself how is that possible?  Have you ever tried to swing a bat in the winter compared to a humid summer day?  It’s not the same and VMI tracks each batters muscle memory to various weather conditions.  A batter’s muscle memory takes time to adjust to certain weather conditions.  When taking VMI into effect I avoid teams or players with a number less than -5 which simply can be explained as they haven’t been hitting pitches with the type of movement that they will face on that day.  As far as what’s good for teams or players, I try and target +5 or greater because they will be used to pitches with high movement and their Visual memory will be good.

Air Density Index aka ADI is very simple to explain.  It’s a scale that goes 0-100 and is affected by three things (Elevation, temperature, and Humidity).  The Air Density is important in baseball because it will let you know how much movement the baseball will have in that ballpark on that day.  The higher the ADI the more movement on the pitch.  Typical 60 is the number people use to decide if the pitcher’s movement will be good or bad.  The lower an ADI is from 60 the less movement the pitchers ball will have and the higher it is from 60 will show the increase in the pitcher’s ball movement to the batter’s eye.


Todays Top Pitchers per VMI/ADI

Zack Grienke- Grienke takes the mound tonight at home where he has pitched very well this season (10-1, 2.52 ERA).  The Astros which have been quiet of late, enter todays matchup with a team VMI of -1.91 so they should struggle against Grienke.

Kevin Gausman –I think I’m finally back to believing in Gausman, he pitched well in July going 4-0 with an ERA 3.63.  The conditions tonight in Safeco will be pitcher friendly (67.90 ADI) and the Mariners have a team VMI of -1.91 so all signs lead to Gausman doing well tonight.


Top Teams to use for hitting per ADI/VMI

  • ATL vs COL- As usual a Coors slate is always going to have this as your top option.  The ADI tonight is 42.54 so the ball should be flying out.  Let’s also add in both teams have a VMI over 18 and have Teheran and Bettis pitching so I’d expect this game to be very popular tonight.


  • Detroit Tigers – Tonights a perfect spot for the Tigers, they have been hitting LHP very well of late. The Tigers have a team VMI of +6.17 and should go under the radar if you’re looking to fade Coors


  • Miami Marlins– It’s going to be hot and humid today in MIA. The Marlins get to face Ty Blach and the SF Giants that had to play 3 games in less than 24 hours yesterday.  The Marlins have a team VMI of +0.60 which may be minor but with the other factors included I love it.