All about weather. Learn how meteorologists forecast the weather and why some weather systems are hard to predict.
Uuendatud: 3 tundi 38 minutit tagasi
A new study provides the first comprehensive theory for why there were clusters of megadroughts in the American Southwest during Medieval times. The authors found that ocean temperature conditions plus high radiative forcing -- when Earth absorbs more sunlight than it radiates back into space -- play important roles in triggering megadroughts. The study suggests an increasing risk of future megadroughts in the American Southwest due to climate change.
Researchers have developed a laser-based system that can be used for airborne measurement of important atmospheric gases with unprecedented accuracy and resolution. The ability to collect this data will help scientists better understand how these atmospheric gases affect the climate and could help improve climate change predictions.
A predictive model combining information about plant physiology, real-time soil conditions and weather forecasts can help make more informed decisions about when and how much to irrigate. This could save 40 percent of the water consumed by more traditional methods, according to new research.
Why did the oceans warm and cool at such different rates in the early 20th century? New research points to an answer both as mundane as a decimal point truncation and as complicated as global politics. Part history, part climate science, this research corrects decades of data and suggests that ocean warming occurred in a much more homogenous way.
Over the past 22 years, sea levels in the Arctic have risen an average of 2.2 millimeters per year. This is the conclusion of a research team after evaluating 1.5 billion radar measurements of various satellites using specially developed algorithms.
They outlived mammoths and saber-toothed tigers. But without dramatic action to reduce climate change, new research shows Joshua trees won't survive much past this century.
Researchers have developed a new computer model for calculating the water content of snowpacks, providing an important tool for water resource managers and avalanche forecasters as well as scientists.
November 8, 2018 was a dry day in Butte County, California. The state was in its sixth consecutive year of drought, and the county had not had a rainfall event producing more than a half inch of rain for seven months. The dry summer had parched the spring vegetation, and the strong northeasterly winds of autumn were gusting at 35 miles per hour and rising, creating red flag conditions: Any planned or unplanned fires could quickly get out of control.
Fluctuations in the masses of the world's largest ice sheets carry important consequences for future sea level rise, but understanding the complicated interplay of atmospheric conditions, snowfall input and melting processes has never been easy to measure due to the sheer size and remoteness inherent to glacial landscapes.
The El Niño-Southern Oscillation has been responsible for widespread, simultaneous crop failures in recent history, according to a new study. This finding runs counter to a central pillar of the global agriculture system, which assumes that crop failures in geographically distant breadbasket regions such as the United States, China and Argentina are unrelated. The results also underscore the potential opportunity to manage such climate risks, which can be predicted using seasonal climate forecasts.
Global trends in cave waters identify how stalagmites reveal past rainfall and drought patterns.
Researchers have revealed that atmospheric waves originating from convection over the Indian Ocean had a dramatic impact on climate conditions over South America and South Atlantic, leading to drought and marine heatwaves. Importantly, these conditions are not a one-off and are likely to happen again.
When forecasting weather, meteorologists use a number of models and data sources to track shapes and movements of clouds that could indicate severe storms. However, with increasingly expanding weather data sets and looming deadlines, it is nearly impossible for them to monitor all storm formations -- especially smaller-scale ones -- in real time.
Irrigation dropped maximum temperatures by one to three degrees Fahrenheit on average while increasing minimum temperatures up to four degrees compared to unirrigated farms or forests, new research shows. In all, irrigated farms experienced a three- to seven-degree smaller range in daily temperatures compared to other land uses. These effects persisted throughout the year.
For any future sustainable energy system, it is crucial to know the performance of photovoltaic (solar cell) systems at local, regional and global levels. Researchers have investigated and mapped the capacities of photovoltaic generation in the European countries in four different configurations: Rooftop, optimum tilt, tracking and delta configuration, and made the data openly available. The different configurations have a strong influence on the hourly difference between electricity demand and PV generation.
A big data study covering more than 7,500 households across 23 tropical countries shows that natural biodiversity could be effective insurance for rural farmers against drought and other weather-related shocks. Farmers in areas with greater biodiversity took less of an income hit from droughts than their peers who farmed amid less biodiversity.
One-seventh of the world's population depends on rivers flowing from Asia's high mountain ranges for water to drink and to irrigate crops. Rapid changes in the region's climate are likely to influence food and water security in India, Pakistan, China and other nations. NASA keeps a space-based eye on changes like these worldwide to better understand the future of our planet's water cycle.
Computer scientists are working on a system that is supposed to predict local thunderstorms more precisely than before.
Understanding how the weather and climate change is one of the most important challenges in science today. A new theoretical study presents a new mechanism for the self-aggregation of storm clouds, a phenomenon, by which storm clouds bunch together in dense clusters. The researcher used methods from complexity science, and applied them to formerly established research in meteorology on the behavior of thunderstorm clouds.
New research find that some plants and trees are prolific spendthrifts in drought conditions -- 'spending' precious soil water to cool themselves and, in the process, making droughts more intense.
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26. augusti ekstreemumid 2009-2019
Täna Tallinnas kõige soojem on olnud 29,3°C (1997) ja külmem 4,2°C (1966).
Täna Tartus kõige soojem on olnud 29,5°C (1997) ja külmem 2,6°C (1984).