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Category Archives: Phenomena
Do weather radars detect more than precipitation?
Yes. Radar, an acronym for RAdio Detection And Ranging, consists of a transmitter and a receiver. The transmitter emits radio wave pulses outward in a circular pattern. Objects scatter these radio waves, sending some energy back to the transmitting point where it is detected by the radar’s receiver. The intensity of this received signal indicates the size and density of the suspended objects, such as precipitation. The time it takes for the radio wave to leave the radar and return indicates the distance.
Radar is designed to detect precipitation intensity and type, but it can detect living things as well. Flying insects in huge numbers can reflect enough energy back to a radar site to be detected. As an example, mayflies emerge in summer in enormous numbers around the Mississippi River between Wisconsin and Minnesota and are often detected by the weather radar in La Crosse, WI. Continue reading
How can the Upper Midwest get such high dew points every year?
The dew point temperature is a measure of the amount of water vapor in the atmosphere and is also a good way to tell how uncomfortable you might feel on a hot day. Hot days and high water vapor contents are a serious health risk for some. Also, high water vapor content is a key fuel for severe thunderstorms.
There are three primary sources of water vapor that address this question: advection of water vapor largely from the Gulf of Mexico, evaporation over the Great Lakes, and transpiration from corn fields. The contribution from the Great Lakes in summer is minimal in comparison to the other factors, except maybe near the shorelines. Continue reading
Do tornadoes occur over all parts of Earth?
The only continent that has not recorded a tornado is Antarctica. Otherwise, tornadoes can happen in just about any location.
North America, and specifically the United States, accounts for more than 75% of the world’s reported tornadoes. Other tornado-prone areas around the globe include western Canada, Argentina, the western Mediterranean, Japan, Bangladesh, Australia, New Zealand and South Africa. Continue reading
Category: Meteorology, Phenomena, Severe Weather
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Are ‘chem trails’ a real thing?
For years we have fielded questions on our monthly radio show on WHA regarding the nature of condensation trails left in the wake of jet airliners. These contrails are composed of ice crystals that develop from the exhaust of jet … Continue reading
Did the total solar eclipse impact the weather?
If you were in the path of the total solar eclipse last week, you may have observed a change in your environment. The more sunlight that was blocked, the more dramatic the changes.
A range of surface and near-surface meteorological observations can occur during a total solar eclipse. If it was a cloud-free day, or mostly cloudy day, you probably felt a drop in temperature. As the moon crossed in front of sun, it cast a shadow blocking solar energy from reaching your location. While it may have lasted only a few minutes, the reduction in solar radiation would result in a drop in temperature. In some locations, the temperature dropped by as much as 10 degrees. As the sun reappeared, the temperature increased. Continue reading
