Police said the suspect fatally hit a pedestrian on the South Fork four months ago and fled the scene.
Relocated guests was reported to include Hurricane Sandy victims.
Wind gusts could top 50 mph.
Heaviest snow expected to hit eastern half of Suffolk County.
Flanagan was found guilty of three misdemeanors and acquitted of a felony charge.
The teenager robbed the car in Hicksville and led police on a chase to North Merrick, where he rammed a patrol car before crashing into a school building.