NSSL

acronym: National Severe Storms Laboratory
Found on http://cdiac.ornl.gov/pns/acronyms.html#N

NSSL

National Severe Storms Laboratory; Norman, OK
Found on http://www.translationdirectory.com/glossaries/glossary287.php

nssl

National Severe Storms Laboratory. Located in Norman, Oklahoma, the office is responsible for monitoring and forecasting severe convective weather. (Storm Prediction Center)
Found on http://www.stormfax.com/wxwords.htm

NSSL

The National Severe Storms Laboratory.
Found on http://www.encyclo.co.uk/local/22268
No exact match found