It's a meteorological muddle out there this morning. For the past several hours Central Park has been reporting "unknown precip" falling from the sky. That's code for something on the fog/mist/drizzle/rain continuum. The city is too warm for freezing rain, but there is a winter weather advisory and numerous school closings and delays in the northern suburbs. The precipitation should turn to all rain by this afternoon as warmer air arrives from the Sahara.

Today's high will top off near 40 degrees. The mix of snow, freezing rain and sleet could return tonight as the temperature drops through the thirties.

The storm will move away late tonight. In its wake the last of a series of recent cold air masses will arrive. Tuesday's high will be in the mid 30s but that will happen at midnight. Look for the temperature to slowly fall to the mid 20s during the day tomorrow despite abundant sunshine. Wednesday will only be slightly warmer with a high near 30.

The jet stream is expected to shrink northward toward the end of the week. That shrinkage will allow warmer air to arrive. Thursday is expected to warm to the mid 30s, Friday to near 40, and the weekend to the lower or mid 40s with little chance of precipitation until sometime next week.