The National Weather Service office in Indianapolis has upgraded its forecast for central Indiana, issuing a Winter Storm Warning as snowfall expectations increase across the region.

Forecasters now say 4 to 6 inches of snow are likely in the Fishers area and much of central Indiana, with isolated locations possibly receiving higher amounts. The Winter Storm Warning is in effect from 11 a.m. Saturday through midnight.

The snow is expected to create slippery and hazardous travel conditions throughout the day and evening. Officials warn that road conditions could worsen quickly as temperatures fall after the snow ends.

Compounding the situation, a Cold Weather Advisory remains in effect from midnight Saturday through 1 p.m. Sunday. Wind chills are forecast to drop as low as 23 to 25 degrees below zero, creating dangerous conditions for anyone outdoors for extended periods.

The extreme cold will also make snow and ice removal more difficult for road crews, as treated surfaces can quickly refreeze once temperatures plunge.

The National Weather Service cautions that frostbite on exposed skin could occur in as little as 30 minutes under these conditions, and prolonged exposure could lead to hypothermia.

Drivers are urged to use caution if travel is necessary and to keep emergency supplies such as food, water and a flashlight in their vehicles. Residents heading outside are advised to wear layered clothing, hats and gloves to protect against the bitter cold.

Up-to-date road conditions across Indiana are available by calling 511.