By in-depth examination of low pressure winter systems known as "Cypriot depressions" in the Negev, the study offers new insights into the role of the electric field in the detection of heavy precipitation
New research reveals how monitoring electric fields in the atmosphere can improve predictions of extreme weather events. The researchers found significant changes in the electric fields during heavy rains, while analyzing data from southern Israel. These findings indicate that electric field measurements can be used as early indicators of extreme weather, and offer immediate forecasting capabilities, especially in areas prone to flash floods and sudden changes in the weather.
A new study led by Dr. Roi Yaniv from the Institute of Earth Sciences at the Hebrew University of Jerusalem and the Sheba Medical Center, in collaboration with Dr. Assaf Hochman from the Hebrew University and Prof. Yoav Yair from Reichman University, has revealed significant progress in understanding the use of atmospheric electric field measurements to predict extreme weather events . By in-depth examination of winter low-pressure systems known as "Cypriot depressions" in the arid Negev desert in southern Israel, the study offers new insights into the role of the electric field in detecting heavy precipitation.
The researchers focused on "wet Cypriot depressions" - situations where rain falls with the passage of a cold front - and noticed a significant increase in the potential gradient of the electric field. The minute by minute analysis of the data showed that the potential gradient values rose sharply from typical levels for fair weather (about 100-200 volts per meter) to hundreds and even thousands of volts per meter during the rain. These increases occurred when convective clouds passed overhead, suggesting that different cloud types produce unique electric field patterns. The study also emphasized that factors beyond the intensity of the rain, such as the structure of the cloud and the electrical charge of the raindrops, affect these electrical fluctuations.
These findings show how changes in electric fields are related to specific weather conditions. This improved understanding of the response of the electric fields to weather events may significantly improve the immediate forecasting systems for predicting extreme weather, especially in areas prone to flash floods and sudden changes in the weather. In Israel, which is between a desert climate and a Mediterranean climate, slight deviations in the location of a low pressure system may cause dramatic changes in the local weather. As a result, monitoring the dynamics of electric fields may provide early signs of extreme weather, and improve community preparedness for climate change.
"This study demonstrates how changes in electric fields can be used as indicators of changes in weather patterns, allowing us to anticipate extreme weather events in real time," said Dr. Roi Yaniv.
"The ability to detect these changes early is especially essential in vulnerable areas like Israel, where even minor changes in climate conditions can lead to significant local effects."
The study highlights the importance of integrating electric field measurements into weather monitoring systems, especially in arid and semi-arid regions that are increasingly prone to the effects of climate change.
