Välismaa uudised

Winter cold extremes linked to high-altitude polar vortex weakening

ScienceDaily - 22. September 2017 - 16:40
When the strong winds that circle the Arctic slacken, cold polar air can escape and cause extreme winter chills in parts of the Northern hemisphere. A new study finds that these weak states have become more persistent over the past four decades and can be linked to cold winters in Russia and Europe.
Kategooriad: Välismaa uudised

Wave Glider surfs across stormy Drake Passage in Antarctica

ScienceDaily - 20. September 2017 - 21:46
A hardy ocean drone made a first-ever attempt to surf across Antarctica's stormy Drake Passage gathering data about ocean mixing.
Kategooriad: Välismaa uudised

Gravity waves influence weather and climate

ScienceDaily - 20. September 2017 - 17:00
Gravity waves form in the atmosphere as a result of destabilizing processes. The effects of gravity waves can only be taken into consideration by including additional special components in the models.
Kategooriad: Välismaa uudised

Maria makes landfall on Puerto Rico as a high-end Category 4 Hurricane

Severe Weather Europe - 20. September 2017 - 15:13
The powerful Hurricane Maria has made landfall on Puerto Rico. The powerful hurricane packs 155 mph (250 km/h) sustained winds, a high end Category 4 hurricane. Early reports indicate the entire island is engulfed in hurricane-force winds, with peak winds of 155 mph (250 km/h). The eyewall of Hurricane Maria made landfall over Yabucoa in the southeastern part of the island. First visible light image of the day of Hurricane Maria engulfing Puerto Rico. Image: NOAA RAMMB / CIRA. Aircraft recon obs of Hurricane Maria’s winds at flight level at 11:28 UTC today as the hurricane made landfall. Image: Tropical Tidbits. The island was likely spared Category 5 damage by a fortunate timing of the eyewall replacement cycle – the
Kategooriad: Välismaa uudised

Major magnitude 7.1 earthquake hits Mexico

Severe Weather Europe - 20. September 2017 - 13:05
A major, magnitude 7.1 earthquake hit Mexico late yesterday, September 19. Particularly hard hit was the Puebla region. Preliminary analysis of the event indices the epicenter was approcimately 58 km SW of Puebla de Zaragoza, Mexico, a city of nearly 3 million, at a depth of approximately 50 km. Reports suggest many buildings in Puebla were damaged, with many collapses. 200 fatalities have been reported so far, however, the number may rise significantly. Preliminary fault plane solutions (i.e. earthquake mechanism) indicates the main shock happened on a normal fault and is not directly related with the September 8 magnitude 8.1 earthquake. Preliminary fault plane solutions. Image: EMSC. Below are some of the first reports from the area hit hardest:
Kategooriad: Välismaa uudised

Category 5 Hurricane Maria now tracking towards Puerto Rico

Severe Weather Europe - 20. September 2017 - 11:22
The Category 5 Hurricane Maria is now tracking for landfall on Puerto Rico. The powerful hurricane packs 165 mph (270 km/h) sustained winds. The powerful Category 5 Hurricane Maria has Puerto Rico dead in its sights. The latest public advisory by the NOAA National Hurricane Center has Maria sustaining 165 mph (270 km/h) winds, a solid Category 5 hurricane, while tracking towards Puerto Rico at about 10 mph (17 km/h). Central pressure has dropped to 910 mbar. Radar imagery of the hurricane indicates a double eyewall. The tight inner (‘pinhole’) eye, with the extremely powerful wind field and a distinct outer eyewall, about 3 to 4-times the diameter of the inner one. It is likely the hurricane will go through
Kategooriad: Välismaa uudised

End-of-summer Arctic sea ice extent is eighth lowest on record

ScienceDaily - 19. September 2017 - 23:01
Arctic sea ice appeared to have reached its yearly lowest extent on Sept. 13, scientists have reported. Analysis of satellite data showed that at 1.79 million square miles (4.64 million square kilometers), this year's Arctic sea ice minimum extent is the eighth lowest in the consistent long-term satellite record, which began in 1978.
Kategooriad: Välismaa uudised

Changes in non-extreme precipitation may have not-so-subtle consequences

ScienceDaily - 19. September 2017 - 19:31
Extreme floods and droughts receive a lot of attention. But what happens when precipitation -- or lack thereof -- occurs in a more measured way?
Kategooriad: Välismaa uudised

Category 5 Hurricane Maria slams into Dominica

Severe Weather Europe - 19. September 2017 - 15:00
The tiny sovereign island country Dominica got a direct hit by the Category 5 Hurricane Maria. At the time of landfall the hurricane packed 160 mph (260 km/h) sustained wind and displayed a very tight, pinhole eye, indicative of a very powerful system. In the hours leading up to landfall, Maria organized and strengthened extremely rapidly, going from a Category 1 to a Category 5 hurricane in only 15 hours. By the time it hit, the hurricane packed 160 mph (260 km/h) sustained wind and displayed a very tight, pinhole eye. All signs of a powerful and very dangerous system. Dominica is part of the Windward Islands in the Lesser Antilles archipelago. It is tiny, with a total area of
Kategooriad: Välismaa uudised

Week 13 (March 13-19, 2017) Contest Winners

Severe Weather Europe - 18. September 2017 - 17:12
The WINNER among the 70 (!!) entries in Week 13 is: 1. place – WINNER: Marko Korošec – 159 votes “Epic shelf cloud over NE Italian plains, July 2014” by Marko Korošec. 2. place: Entoni Novosel – 155 votes “Crazy view on this amazing waterspout outbreak near Istrian coast (Croatia) in June 2013” by Entoni Novosel. 3. place: Stavros Kesedakis – 151 votes “Escape / Wray / Colorado – May 7th 2016, an EF2 dusty tornado wanders around as storm chasers escape from its path” by Stavros Kesedakis. 4. place: Justyna Mariusz Nawroccy – 126 votes “Wet-micro burst – Poland 2016” by Justyna Mariusz Nawroccy. 5. place: Sandro Puncet – 101 votes “Wall cloud with lightning. 5.9.2016. Island Losinj. Croatia”
Kategooriad: Välismaa uudised

Devilish source of dust in atmosphere of Earth and Mars

ScienceDaily - 18. September 2017 - 16:28
Swirling columns of sand and dust, known as dust devils, are a feature of desert areas on Mars and on Earth. Now, a study of terrestrial dust devils has shown that around two thirds of the fine particles lifted by these vortices can remain suspended in the atmosphere and be transported around the globe. The findings have implications for the climate and weather of both planets and, potentially, human health here on Earth.
Kategooriad: Välismaa uudised

Black Sea water temperatures may buck global trend

ScienceDaily - 15. September 2017 - 23:29
Scientists have successfully simulated the Black Sea’s long term currents, salt water content and temperature for the first time.
Kategooriad: Välismaa uudised

Hydrogen power moves a step closer

ScienceDaily - 14. September 2017 - 22:22
Physicists are developing methods of creating renewable fuel from water using quantum technology. Renewable hydrogen can already be produced by photoelectrolysis where solar power is used to split water molecules into oxygen and hydrogen. But fundamental problems remain before this can be adopted commercially due to inefficiency. A new study demonstrates that the novel use of nanostructures could increase the maximum photovoltage generated in a photoelectrochemical cell, increasing the productivity of splitting water molecules.
Kategooriad: Välismaa uudised

Koledar selekcija

Severe Weather Europe - 13. September 2017 - 14:24
LETO 2017 ŠT.1 1. place – WINNER: Ivan Stulić – 138 votes – Week 10, 2017 “Nin/Privlaka – Sabunike 27.07.2016” by Ivan Stulić. ŠT.2 1. place – WINNER: Marko Korošec – 126 votes – Week 9, 2017 “Lightning strike over the Trieste gulf, Italy. Sept 5th, 2016” by Marko Korošec. ŠT.3 1. place – WINNER: Rick Bekker – 99 votes – Week 7-8, 2017 “Early morning shelfcloud from a storm that once was a supercell. Moving through the North Sea waters when it slowely becomes linear. This storm gives us some epic structures at 05:30 in the morning over the beautiful UNESCO World Heritage called Kinderdijk.” by Rick Bekker. ŠT.4 1. place – WINNER: Ryan Crouse – 43 votes –
Kategooriad: Välismaa uudised

Clouds like honeycomb

ScienceDaily - 11. September 2017 - 22:09
An innovative network approach to explain polygonal patterns in clouds could help scientists find more accurate descriptions of clouds in computer models of weather and climate change.
Kategooriad: Välismaa uudised

Urban climate change

ScienceDaily - 11. September 2017 - 22:09
Southern cities such as Houston and Tampa -- which faced the wrath of hurricanes Harvey and Irma, respectively -- may not be the only urban environments vulnerable to extreme weather. Northern cities also face the potential for flooding as global temperatures continue to warm.
Kategooriad: Välismaa uudised

How openings in Antarctic sea ice affect worldwide climate

ScienceDaily - 11. September 2017 - 19:26
In a new analysis of climate models, researchers reveal the significant global effects that seemingly anomalous polynyas, or openings in sea ice, can have. Their findings indicate that heat escaping from the ocean through these openings impacts sea and atmospheric temperatures and wind patterns around the globe and even rainfall around the tropics.
Kategooriad: Välismaa uudised

Extreme weather has limited effect on attitudes toward climate policies

ScienceDaily - 7. September 2017 - 21:46
People who recently experienced severe weather events such as floods, storms and drought are more likely to support policies to adapt to the effects of climate change, according to a new study.
Kategooriad: Välismaa uudised

Warmer world may bring more local, less global, temperature variability

ScienceDaily - 5. September 2017 - 19:32
Many tropical or subtropical regions could see increases in naturally occurring temperature variability as Earth warms over coming decades, a new study suggests. These local changes could occur even though Earth's global mean surface temperature variability will likely decrease because of less solar reflection from icecaps at high latitudes.
Kategooriad: Välismaa uudised

Coming soon to Montreal: The infrastructure cost of climate change

ScienceDaily - 31. August 2017 - 22:13
The climate of Montreal is changing and will continue to do so at a rapidly increasing rate and with much more spatial variability in the future, according to new research.
Kategooriad: Välismaa uudised

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