Part #3: Feb 10, 2018 Illinois Winter Storm On Feb 10, 2018, Illinois saw a wide

Question

Part #3: Feb 10, 2018 Illinois Winter Storm On Feb 10, 2018, Illinois saw a wide range of winter weather conditions due to a winter storm passing over the state. Chicago got a foot of snow (shuting parts of the city down). The U of I had to deal with a couple of inches of sieet St. Louis saw over 1/10 of an inch of freezing rain (causing numerous car accidents), while far Southern Illinois received a lot of rain. The image below shows 4 separate soundings that are each labeled with a letter. The solid black line on each sounding represents the temperature profile during the winter storm in Illinois on Feb 10, 2018. The red line represents the O°C (32°F) isotherm. To the right of the red line, temperatures are above freezing and to the left, temperatures are below freezing. Match the sounding to the location based upon the description above. ? ?-t

Explanation / Answer

A. Southern Illinois where rainfall occurred.

B. Sleet in the University of Illinois.

C. Snow in Chicago.

D. Freezing rain in St. Lois.

Explanation: The type of precipitation is controlled by the vertical distribution of temperature. When the temperature remains below freezing point, the precipitation will occur as snow. When the temperature is above the freezing point for a long time, all the snowflakes get converted to water and rain occurs. In case of sleet and freezing rain, the depth of warming layer is the important factor. If the cold layer depth is high, precipitation occurs as sleet as the melted water re-freezes into ice pellets. If the cold layer is thin, freezing rain occurs as the rain doesn't get the time to freeze into sleet

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