The National Weather Service is warning that falling temperatures overnight may cause Monday’s rain to freeze and become Tuesday morning’s ice.
The refreeze could make the morning commute treacherous. From NWS:
… SUB-FREEZING TEMPERATURES OVERNIGHT WILL CAUSE UNTREATED SURFACES TO RE-FREEZE…
TEMPERATURES WILL BE FALLING STEADILY OVERNIGHT BEHIND A COLD FRONT. OVERNIGHT LOWS ARE EXPECTED TO REACH THE UPPER 20S AND LOWER 30S ACROSS THE REGION BY THE PREDAWN HOURS. A STEADY BREEZE FROM THE NORTH WILL DRY OUT SOME SURFACE AREAS LATE TONIGHT. HOWEVER… ANY STANDING WATER LEFTOVER ON UNTREATED SURFACES IS EXPECTED TO FREEZE.
DRY AND COLD NORTH WINDS WILL REMAIN OVER THE AREA INTO THE MORNING HOURS ON TUESDAY… KEEPING TEMPERATURES NEARLY LOCKED INTO NEAR FREEZING RANGE. BE ALERT FOR THE POSSIBILITY OF PATCHES OF ICE WHILE DRIVING OVERNIGHT AND DURING THE MORNING COMMUTE ON TUESDAY.