Weather Watch, September 20

9 of 15 games have notable weather tonight.

9 of tonight's 15 games have weather worth a second look. The rest are playable and unremarkable, which is the normal state of a summer slate and the reason this only runs when there is something to say.

Games to check

NYM, Citi Field. 82% chance of rain, postponement risk

CWS, Rate Field. 63% chance of rain, postponement risk; 20 mph wind from the NE

BAL, Oriole Park at Camden Yards. 60% chance of rain, postponement risk

PIT, PNC Park. 58% chance of rain, postponement risk

STL, Busch Stadium. 91°F, warm air, the ball carries

CIN, Great American Ball Park. 90°F, warm air, the ball carries

TEX, Globe Life Field. 93°F, warm air, the ball carries _Retractable roof, if it is closed, none of this reaches the field, and in heat like this it usually is._

HOU, Daikin Park. 92°F, warm air, the ball carries _Retractable roof, if it is closed, none of this reaches the field, and in heat like this it usually is._

AZ, Chase Field. 96°F, warm air, the ball carries _Retractable roof, if it is closed, none of this reaches the field, and in heat like this it usually is._

Tonight's full board

GameVenueTempWindRainRoof
NYMCiti Field66°F12 mph SE82%open
PITPNC Park76°F8 mph W58%open
CINGreat American Ball Park90°F6 mph W9%open
CLEProgressive Field69°F10 mph NE31%open
TBTropicana Field87°F3 mph ENE27%dome
HOUDaikin Park92°F5 mph E3%retractable
CWSRate Field68°F20 mph NE63%open
STLBusch Stadium91°F6 mph W11%open
TEXGlobe Life Field93°F5 mph S9%retractable
COLCoors Field69°F7 mph NNE22%open
LAAAngel Stadium78°F5 mph SW0%open
LADUNIQLO Field at Dodger Stadium80°F5 mph SSW0%open
SDPetco Park74°F10 mph SW0%open
AZChase Field96°F5 mph S0%retractable
BALOriole Park at Camden Yards78°F5 mph SW60%open

How to read this

Temperature is the most reliable weather effect in baseball: warm air is less dense and the ball carries further. It is a real edge at the extremes and a rounding error between 70 and 80 degrees.

Wind is reported as a speed and a compass direction and deliberately left uninterpreted. Whether a south wind helps hitters depends entirely on which way the park faces, and that is not something this site knows, so the bearing is given as a fact rather than dressed up as a conclusion.

Rain probability is the one to act on in daily formats. A postponed game is a zero in your lineup, and that costs more than any carry effect gains.

Retractable-roof parks are flagged with a caveat rather than asserted. The feed reports the roof TYPE, never whether it is open tonight, and a park that shuts the roof at 100 degrees turns the loudest number on the board into no effect at all. Fixed domes are excluded outright.

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