You are using the pressure reading from your SmartHUB. On "My AcuRite" if you go under the device menu and edit your smartHUB profile you will see two settings for Barometric Pressure (Adjusted Pressure & Station Pressure).
Adjusted Pressure: will take your smartHUB reading and adjust it for elevation. WU will do the same thing.
Station Pressure: Will use your smartHUB reading without any adjustment for elevation.
You can calibrate your smartHUB pressure reading by changing the elevation in the smartHUB profile.
I calibrate both my display reading and smartHUB readings. I change my display pressure to match my smartHUB.
Adjusted Pressure: will take your smartHUB reading and adjust it for elevation. WU will do the same thing.
Station Pressure: Will use your smartHUB reading without any adjustment for elevation.
You can calibrate your smartHUB pressure reading by changing the elevation in the smartHUB profile.
I calibrate both my display reading and smartHUB readings. I change my display pressure to match my smartHUB.