al-UM-nee
The emphasis is on the second syllable, "UM".
Here's a breakdown:
* al- is pronounced like the "al" in "alligator"
* UM- is pronounced like the "um" in "umbrella"
* -nee is pronounced like the "nee" in "knee"
It's easy to get confused with the pronunciation of "alumni" which is pronounced al-UM-nigh.