Advanced Cyclone Forecasting is Saving Thousands of Lives
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- Category: Metereología y Oceanografía
- Published on Wednesday, 10 June 2020 03:20
- Written by Administrator2
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The Maritime Executive.
Indian disaster response teams evacuated millions of people from Odisha and West Bengal well in advance of Amphan (NDRF)
[By Hannah Cloke]
On May 18, a massive tropical cyclone with sustained winds of nearly 150 miles per hour was barrelling across the Bay of Bengal towards the low-lying coasts of East India and Bangladesh. This supercyclonic storm Amphan (from the Thai word meaning “sky” and pronounced “um-pun”) was the biggest in the Bay of Bengal since the 1999 Odisha cyclone, which killed 15,000 people.
A few days earlier, when it was just a plain old storm, Amphan had swept through Sri Lanka, killing several people in heavy rain, floods and winds. It would go on to
Active Atlantic Hurricane Season Forecast for 2020 by NOAA
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- Category: Metereología y Oceanografía
- Published on Saturday, 30 May 2020 21:52
- Written by Administrator2
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maritime-executive
Hurricane image courtesy of NOAA
The National Oceanic and Atmospheric Administration (NOAA) is predicting a busy Atlantic hurricane season in 2020 in its just release forecasts.
NOAA’s Climate Prediction Center, a division of the National Weather Service is forecasting a likely range of 13 to 19 named storms (winds of 39 mph or higher), of which 6 to 10 could become hurricanes (winds of 74 mph or higher). The forecast includes 3 to 6 major hurricanes (category 3, 4 or 5; with winds of 111 mph or higher). NOAA said that it provides these ranges with a 70 percent confidence.
According to NOAA, an average Atlantic hurricane season produces 12 named storms, of which 6 become hurricanes, including 3 major hurricanes.
Large dependency of charge distribution in a tropical cyclone inner core upon aerosol number concentration
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- Category: Metereología y Oceanografía
- Published on Monday, 30 March 2020 05:54
- Written by Administrator2
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https://progearthplanetsci.springeropen.com/track/pdf/10.1186/s40645-019-0309-7
Abstract The impacts of aerosols on the charge distribution of hydrometeors and lightning flash density in a tropical cyclone (TC) were investigated using a meteorological model coupled with an explicit lightning model. The meteorological model successfully simulated the tripole structure of charge density distribution in a TC, as reported by previous studies. The impacts of aerosols were investigated through a sensitivity experiment with changing the aerosol number concentration. The tripole structure became unclear with increasing aerosol number concentrations. The positive charge distribution located in the lower layer was not seen, and raindrops with negative charge distribution reached the surface. As a result, the vertical structure of the charge density was dipolar in the polluted case. As the
https://cdip.ucsd.edu/m/documents/wave_measurement.html
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- Category: Metereología y Oceanografía
- Published on Sunday, 09 February 2020 21:17
- Written by Administrator2
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https://cdip.ucsd.edu/m/documents/wave_measurement.html
Wave Measurement
Waves - disturbances of water - are a constant presence in the world’s oceans. Because waves travel all across the globe, transmitting vast amounts of energy, understanding their motions and characteristics is essential. The forces generated by waves are the main factor impacting the geometry of beaches, the transport of sand and other sediments in the nearshore region, and the stresses and strains on coastal structures. When waves are large, they can also pose a significant threat to commercial shipping, recreational boaters, and the beachgoing public. Thus for ensuring sound coastal planning and public safety, wave measurement and analysis is of great importance.
The discussion below is largely based on Part II, Chapter 1 of the Coastal Engineering Manual (CEM), published