Ever tried to build a snowman with powdery snow, only to find that it just won't stick? Or have you noticed how much harder it is to shovel sticky snow compared to when it's in its light, fluffy form?
The cause for these differences is the surface temperature. When surface temperatures are just above freezing, snow can melt slightly, adding more moisture and creating heavy, wet snow. When surface temperatures are below freezing, you get powder.
Powdery snow contains less water, on average 5 inches of dry snow will melt to only 0.5 of an inch of water. Wet snow, however, can equal up to an inch of water for every 5 inches of snow. Not only is wet snow heavier and therefore harder to shovel, it's also more likely to accumulate an ice layer than powdery snow.
Why can different types of precipitation be seen on Earth while temperatures remain constant?
Dangerous flash flooding is captured as an arroyo becomes filled with water in Carson Valley, Nevada.
The RealFeel Temperature uses an equation to determine how it actually feels outside.
Knowing what the different advisories, watches, and warnings mean will lead to more informed decision making when a winter storm threatens a particular area.
How can you determine if and when the ice is thick enough for safely going out on?
Seeking shelter in the event of a tornado could save your life, but is there really any safe place to hide?
Driving on a 90-degree angle away from the tornado is a good strategy to follow in order to distance yourself from the tornado.
Supercell thunderstorms have been responsible for major tornadoes that have demolished parts of the U.S.
After a cold, clear winter night without much wind, the ground and nearby tree branches may be covered by tiny, white ice crystals.
A major cause of post-snow flooding are ice jams in waterways.
Buffalo, NY (2001)
The month was the mildest, most snow-free Novembers in history. There was not a flake of snow the entire month, which was the first time since records were kept.
Severe early cold with record November lows: Location Temperature Buffalo, NY 2 degrees New York City 7 degrees Boston -2 degrees Philadelphia 8 degrees (earliest ever below 10 degrees for city)
Washington, DC (1967)
A total of 6.9 inches of snow - greatest amount ever recorded in DC on one calendar day in November.