9:45 to 9:45 in slowly smooth 15-minute increments:

Here's the future radar from the HRRR model in smooth 15-minute increments from 9:45 tonight to 9:45 tomorrow morning. You can see that for Long Island it's generally freezing rain to sleet to snow (north shore) and then more sleet before it becomes plain rain from south to north between 4 AM and 6:30 AM.