The National Weather Service has extended the Winter Storm Warning to 7am Saturday.

Below is the updated Warning, from NWS:

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WHAT...Dangerous Cold. Strong and gusty winds resulting in
  blowing and drifting snow. Light snow at times.

* WHERE...Portions of central, east central, north central and
  west central Indiana.

* WHEN...Until 7 AM EST Saturday.

* IMPACTS...Plan on slippery road conditions. Widespread blowing
  snow could significantly reduce visibility. The hazardous
  conditions could impact the evening commute. Gusty winds could
  bring down tree branches. The cold wind chills as low as 30
  below zero could cause frostbite on exposed skin in as little
  as 30 minutes.

* ADDITIONAL DETAILS...Dangerously cold wind chill of -25 to -35
  will be common tonight. Wind gusts will peak up to 45 mph.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If you must travel, keep an extra flashlight, food, and water in
your vehicle in case of an emergency.