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Category Archives: History
When does the winter cold end?
It has now been more than two weeks since our last below-zero morning here in Madison — Feb. 3 was minus 8 degrees. Thus, a natural question might be this: Are we done with bitter cold for the winter?
If we use an overnight low temperature at or below zero as the metric, then 45 of the 83 winters since 1939-40 have seen a cold spell after Feb. 20 — a surprising 54.2% of the time. In fact, in 1982, the last zero degree (or colder) night was not until April 7, the latest date in the last 83 years. Continue reading
How unusual was the past weekend’s fantastic weather?
It is a fair bet that we would get near universal agreement that this October has been pretty spectacular here in southern Wisconsin. Through the 29th, the average temperature has been exactly normal, and we have had only 11 days … Continue reading
What can happen to hurricanes when they move into the mid-latitudes?
Hurricanes are large-scale, organized storms that form in the tropical latitudes.
They are fueled by the enormous amount of heat released when water vapor, evaporated off the warm tropical ocean surface, changes phase to liquid and ice in the thunderstorm clouds of the hurricane.
They are smaller in areal extent than the storms that commonly affect us in the mid-latitudes here in Madison. Continue reading
Category: History, Meteorology, Severe Weather
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Has this been an unusually hot start to summer?
The recent stretch of warm, humid weather has got some people wondering if we have gotten off to an unusually hot start to summer this year in Madison.
There are a couple of ways one could approach that question. One way is to consider the departure from average for our daily high temperatures since May 1. From that perspective, we have been consistently warmer than normal with May daily highs averaging 3.2 degrees above normal and, June (through Friday) averaging 1.9 degrees above normal. Continue reading
Did weather forecasting play a role in D-Day?
Last week was the 78th anniversary of the Allied invasion of Europe that began with the landings on the beaches at Normandy. The combined land, air and sea assault of June 6, 1944, remains the largest such event in history.
The success of the invasion was extraordinarily dependent on weather conditions. More than three months before the invasion, a combined British and American forecasting team began rigorous forecast exercises designed to iron out the physical and logistical kinks of such a coordinated effort. Continue reading
