BRYAN, Tex. (KBTX) - Old man winter did not hold back Friday. In addition to dropping temperatures to the 30s and blowing wind chills to the 20s, a light wintry mix fell in the form of rain, sleet, and graupel.
Here is the set up:
• Upper low out west providing the lift needed to get precipitation to form & fall out of the clouds
• Air in the upper levels of the atmosphere: too dry for precipitation to form.
• Air in the lowest levels of the atmosphere: too dry for precipitation to form.
• Air between 9,000ft and 15,000ft: saturated (enough moisture) for precipitation to form
• As snow fell from the clouds, most of it evaporated / sublimated. Those snowflakes were sacrificed to cool & moisten the low levels of the atmosphere for others to make it to the ground
• Super cooled water droplets formed around snowflakes to form graupel which came down to the surface as softer-than-hail, harder-than-snow pellets
Here's how the National Weather Service describes sleet vs graupel:
Below are some of the images and videos sent in to the KBTX PinPoint Weather Team through the day.