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Monthly Archives: March 2015
Is water always present in the atmosphere?
Evidence of the presence of water in our atmosphere is ubiquitous. Water occurs in the Earth’s atmosphere in all three of its phases — solid (snow and ice), liquid (rain and dew) and gas (invisible water vapor).
As we begin to emerge from winter and enter spring, we may begin to see more dew on the ground and on the windshields of cars in the morning. The air nearly always holds some amount of water vapor. Dew is liquid water that condenses overnight onto objects when the air that contains the water vapor cools to a sufficiently low temperature. Continue reading
Why was part of the sky green on Tuesday night?
Why was part of the sky green on Tuesday night? Continue reading
When does spring begin?
Spring marks the transition from winter to summer. Meteorologists often define the three months of spring as March through May. By that definition, spring would begin on March 1.
We might also define spring as the day on which, if there is precipitation, it is more likely to be in the form of rain than snow. Continue reading
Do snowballs in Washington, D.C., count as evidence against global warming?
Last week, Sen. James Inhofe of Oklahoma, the current chairman of the Senate Environment and Public Works Committee, brought a snowball fashioned from accumulated snow in Washington, D.C., onto the floor of the United States Senate.
Inhofe used the snowball as proxy “evidence” of, in his words, the “hysteria on global warming.” Continue reading
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Are there different types of snowfall?
While forecasts of snowfall have improved, they remain a challenge for even the best forecaster. Heavy snow often occurs in narrow bands and the exact location and orientation of those bands can be hard to predict.
Winter weather can be life-threatening, and under hazardous conditions the National Weather Service issues weather watches, warnings and advisories. Continue reading
