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Category Archives: Meteorology
Where does water exist?
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 the recent cool spell and really enter spring/summer, we may begin to see more dew on the ground and on the windshields of cars in the morning. Continue reading
How unusual was this cold first half of May?
The first two days of this month had high temperatures of 87 and 84, respectively, and daily average temperatures (the average of the daily high and daily low) that were 15 and 19 degrees above normal.
In the next 12 days, the daily average temperature has been just shy of 6 degrees below normal. In fact, during that nearly two week stretch, nine days have had overnight lows in the 30s, including a streak of eight straight days from May 7 through Friday. The morning low on Tuesday was 30 degrees — notably cold and memorable for most of us, but only the 61st coldest morning in the first half of May in Madison’s history, far behind the all-time lowest of 19 degrees recorded on May 1, 1978. Continue reading
Can space dust affect our atmosphere?
Space contains tons of dust. When dust particles approach Earth, they can be captured by gravity and enter the atmosphere at very high speeds.
Particles with diameters larger than about 2 millimeters undergo very rapid heating through collisions in our atmosphere. As they heat up, they can produce a short-lived trail of light known as “shooting star.” Most dust particles entering the atmosphere are estimated to be much smaller than this and don’t provide a visible trail. Continue reading
What caused the snow showers of last week?
Last week’s snow showers garnered their fair share of attention.
The showers were intermittent, a snowy period often followed by a break in the clouds through which an interval of sunshine prevailed. On both days this showery activity ended near or just before sundown. Continue reading
Are April showers likely to be snow?
After a benevolent first week of April, we have really been brought back to reality as temperatures in Madison have been increasingly chillier since the monthly high of 79 was recorded on April 6.
April 14 was particularly chilly, with the high only getting to 40 under persistent clouds. It could be worse, however. Last Friday it snowed over southern New England — with totals as high as 9 inches in southern New Hampshire and widely greater than 2 inches in the northern suburbs of Boston. Continue reading
