Not sure what you mean by "Webster's", since any dictionary can call itself that. Merriam-Webster's Third International does not accept "fort" as a pronunciation. All their variants include the final vowel in one form or another. (Unfortunately, the special characters used to show the pronunciation don't copy.
The link below may or may not take you to the correct page, since the full on-line dictionary requires a subscription.)
Given that the word is French it seems as likely as the Italian musical
forte to be pronounced with the final vowel voiced, not silent.
Main Entry: 1forte Pronunciation Guide
Pronunciation: f()r]t, -()r], -], -()], usu ]d.+V also fr]d.(), -()], ]()t
Function: noun
Inflected Form(s): -s
Etymology: earlier fort, from Middle French, from fort, adjective, strong -- more at FORT
1 one's strong point : that in which one excels
2 : the stronger part of the blade of a sword : the part or half of a sword nearest the hilt -- opposed to foible
Citation format for this entry:
"forte." Webster's Third New International Dictionary, Unabridged. Merriam-Webster, 2002. http://unabridged.merriam-webster.com (27 Apr. 2005).
Regards,
Joe