Newsletter Issue 11 (September 2021)

The Weather of August 2021 – cloudy with localized heavy rain

August 2021 was characterized by cloudier than usual weather with localized heavy rain over parts of the New Territories. The mean amount of cloud in the month was 77 percent, 7 percent above the normal of 70 percent. As for monthly rainfall, the monthly rainfall recorded at the Observatory was 350.5 millimetres while over 600 millimetres of rainfall were recorded in parts of the North District of the New Territories.

UN ESCAP: Countries in Asia-Pacific region should prepare for complex, overlapping crises

Notwithstanding the progress made by many countries in devising more robust systems of early warning and responsive protection – with far fewer people dying as a result of natural disasters – the COVID-19 pandemic has demonstrated that almost without exception, countries around the world are still ill-prepared to deal with multiple overlapping crises, which often cascade, with one triggering another.

China upgraded NWP system empowers global tropical cyclone prediction

On 1 September, CMA’s independently developed global assimilation forecast system GRAPES_GFS completed upgrading. Using this system, CMA has carried out prediction for the track and gale of hurricane Ida and Nora from 28 August. The tropical cyclone forecast scope of World Meteorological Centre (Beijing) is expanded from Northwest Pacific and the South China Sea to the entire world.



Hurricane Ida stunned meteorologist in New York

The flooding was forecast, but to see New York City underwater was not something anyone could have imagined. It wasn’t because the forecast was a bust. In fact, the forecast was spot-on. Three days in advance, the prediction center was watching the potential for major flooding. It labeled 1 September as a “high risk” day for extreme rainfall. That only happens about 4% of the time, so these days are taken seriously in the weather community.

UN weather agency: millions affected by climate change and extreme weather in Latin America and Caribbean

Climate-related and geophysical events resulted in the loss of 312,000 lives and directly affected more than 277 million people in Latin America and the Caribbean, a new report released by the World Meteorological Organization revealed on Tuesday. Increasing temperatures, changing rainfall patterns, storms and retreating glaciers have all had a profound impact on human health and safety, food, water, energy security and the environment.

Climate change made floods in Western Europe more likely

The study focused on the extreme rainfall that triggered floods in two areas that were particularly affected: the Ahr and Erft region of Germany, where, on average, 93 mm fell in one day, and the Belgian Meuse region, where 106mm fell in two days. (Link for the full study) These floods have shown us that even developed countries are not safe from severe impacts of extreme weather that we have seen and known to get worse with climate change. This is an urgent global challenge and we need to step up to it. The science is clear and has been for years.

Climate change: Arctic warming linked to colder winters

A new study shows that increases in extreme winter weather in parts of the US are linked to accelerated warming of the Arctic. The scientists found that heating in the region ultimately disturbed the circular pattern of winds known as the polar vortex. This allowed colder winter weather to flow down to the northern midlatitudes. (Link for the paper)

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