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Figure 1. MiRS NOAA-20/ATMS retrieved TPW (descending and ascending orbits) on 24 October 2021 over the eastern Pacific and West Coast region. The atmospheric river is clearly seen. Locations of the four vertical cross-sections shown in Figure 2 are indicated by the dashed lines.

NOAA’s MiRs Captures Category 5 Rainfall Event in California

On October 24, a powerful Category 5 (the maximum possible) atmospheric river (AR) occurred over the northern and central parts of California. The storm system featured record breaking precipitation, leading to flooding and mudslides in some locations, along with dangerous winds exceeding 70 miles per hour at higher elevations. San Francisco recorded its fourth highest single-day rainfall amount of over 4 inches. Satellite passive microwave measurements are one of the observational tools that allow depiction of these extreme events, since microwaves are less affected by clouds and precipitation.

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A coral, severely bleached to white

Milestone Report on Coral Reef Health Released Worldwide

ESSIC/CISESS Scientist Jacqueline De La Cour was a contributor and reviewer of The Sixth Status of Coral Reefs of the World: 2020 Report, released by the Global Coral Reef Monitoring Network (GCRMN) on October 5th. This sixth edition is the first since 2008 and the first based on the quantitative analysis of a global dataset, compiled from more than 300 contributors and comprising almost 2 million observations from more than 12,000 sites in 73 countries.

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Figure 1. Global and regional validation of the logistic regression (blue), deep neural network (orange), random forest(green) and XGboost (red) snowfall detection (SD) model for S-NPP.

Fan and Meng Develop New Machine Learning Snowfall Detection Algorithm

ESSIC/CISESS scientists Huan Meng and Yongzhen Fan have recently developed a new machine learning snowfall detection (SD) algorithm, based on eXtreme Gradient Boosting (XGB). The algorithm was developed for the Advanced Technology Microwave Sounder (ATMS) onboard NPP and NOAA-20 as well as the MHS/AMSU-A onboard Metop-A, Metop-B, Metop-C and NOAA-19.

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