Without knowing Eric Webb on Twitter, I'll state that at this point we don't favor a -2C event brewing.  We have ENSO strength forecasts at this link: 

https://www.cpc.ncep.noaa.gov/products/analysis_monitoring/enso_advisory/strengths/index.php

Which are updated once a month and right now an event < -1.5 (a strong La Nina) has about a 10% chance.   Not nothing (1 in 10 times it will happen!) but low probability.