Air Density Report w/ @Syracuseeee – 8.3.17


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

ADALBERTO MEJÍA-  Mejia is an interesting guy for tonight.  I think Mejia has not been given enough credit this year with a 4-4 record and ERA just above 4.00.  Mejia is one of those pitchers that hasn’t been great but also hasn’t been blown up this year.  Tonight he will get a Rangers with a team VMI of -6.89 in an ADI of 66.44 which should be great for pitching.

RICK PORCELLO– Porcello is a guy I haven’t played much this year.  Earlier in the year he was getting shelled and didn’t look like the pitcher he was last year.  Recently he has been pitching much better and gets a struggling White Sox team with a VMI of -2.89 which is a decent drop off from last night.  The ADI tonight in Boston will be 64.72 which should help Porcello out dramatically.

Graveman vs Blach – The conditions for pitching are great as usual tonight in Oakland if you feel like taking a chance on either.


Top Teams to use for hitting per ADI/VMI

Remember by the last game of the series Team VMI’s are close to neutral because these are accustomed to their conditions

  • Mets/Rockies- The trend of Coors will continue but by the 3rd game of this series both teams should be use to the pitchers ball movement.  The ADI in Coors is still very juicy at 45.83 so expect the runs to continue.


  • Cleveland Indians- I think this is a great play for tonight if you want to separate yourself from the field. The Indians have a better than average team VMI at 2.91 and it’s a decent bump up from yesterday.  The Indians have been hitting so if you want to be different here’s your chance.  Everyone is going to expect Sonny Gray to shut them down.