CHICAGO (CBS) — The National Weather Service has issued a frost advisory from midnight tonight until 9 a.m. tomorrow in northwest Indiana.

(Credit: CBS)

More favorable conditions for frost are expected to form across northwest Indiana, with clearing skies and light winds.

(Credit: CBS)

Meantime, it will be slightly milder in Illinois, with some cloud cover.

(Credit: CBS)

High pressure overhead will give us another dry day tomorrow, with slightly warmer temperatures.

(Credit: CBS)

The next storm system arrives Thursday, with showers during the day; and the heaviest rain likely Thursday night into Friday morning. Rain amounts could reach 1 inch in spots. Winds will be gusty from the north, generating high wave action, though not as dramatic as last weekend.

(Credit: CBS)

Halloween is looking fair and dry for now.

A strong cold front early next week will hold highs in the 40s.

(Credit: CBS)

TONIGHT: PARTLY CLOUDY. LOW 42.

WEDNESDAY: HIGH CLOUDS INCREASE. HIGH 58.

THURSDAY: RAIN DEVELOPS. HIGH 55.

Mary Kay Kleist