Washington @ ATLANTA
WASHINGTON/Atlanta over 9 -120

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Posted at 10:30 AM EST.

1:35 PM EST. We’ve mentioned before that we’ve been studying weather conditions and how it affects the flight of the baseball and how we have the resources to put that to use.

The effects of humidity on air density is very slight and is actually opposite what it is commonly purported to be. The common reputation of humidity is that it is heavy; however, this is a misnomer. Humidity is actually light for a projectile to fly through, because there is more hydrogen in humid air than in dry air, which contains a larger percentage of nitrogen. And, of course, nitrogen is heavier than hydrogen.

There is a scale that takes into account humidity, as well as temperature and elevation-related barometric pressure that gives us an Air Density Index reading at every ballpark or zip code and the reading today at SunTrust Park is 57.94. Keep in mind that Coors Field is generally in the low 50’s while almost all other parks are between 60 and 80. Also keep in mind that low Air Density Index means high scoring and a high reading means low scoring. This is an extremely low reading. We record all the Air Density readings at every park and here is a small sample of some of readings at SunTrust this year:

Sun Trust 30339

62.13 7-5 (17/3)

60.95 9-7 (22/4)

59.00 16-5 (29/0)

65.82 10-0 (23/2)

57.84 11-6 (26/4)

71.55 2-1 (10/1)

The above sample shows Air-Density Reading – followed by the final score and then hits/home-runs in parenthesis. That number beside SunTrust Park is the zip code of where the stadium is located to give us the most accurate reading available. You’ll notice the two lowest Air Density readings we have on record at SunTrust this year is 59.00 and 57.85 and both those games went way over the posted total.   

Today that Air Density Index, which takes into consideration, elevation, humidity, current temperature and barometric pressure is the second lowest we have seen at this park this year and with the wind blowing out and two garbage starters going with misleading surface ERA’s this appears to us to be a very strong play.

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Our Pick

WASHINGTON/Atlanta over 9 -120 (Risking 2.40 units - To Win: 2.00)

Boston +121 over Cleveland
Chicago +113 over Houston
Seattle -1½ +137 over Texas