Ongoing La Nina conditions in the tropical Pacific Ocean are expected to increase Atlantic hurricane activity

Article Abstract:

The La Nina conditions from Aug-Oct 1998 are expected to increase the possibility of more than the usual number of tropical storms and hurricanes over the North Atlantic. During the said period, the average number of tropical storms is seven, hurricanes is five and major hurricanes is two. La Nina conditions are present when sea surface temperatures are cooler than average in the eastern tropical Pacific. Said conditions cause the easterly winds to replace the westerly winds resulting in wind shear which is a factor in the development of tropical storms and hurricanes.

Forecasts and trends, Environmental aspects, Storms, Hurricane forecasting, La Nina Current

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New satellite instrument helps scientists distinguish snow from clouds

Article Abstract:

Natl Oceanic and Atmospheric Administration (NOAA) scientists have created a new method that will differentiate ice and snow from clouds and fog in satellite imagery. The new method utilizes NOAA's newest polar-orbiting satellite called NOAA 15 which contains a new 1.6-micronm channel called Advanced Very High Resolution Radiometer. The method gives the snow and ice white color while low clouds are given yellow color. Meanwhile, the color for higher clouds ranges from yellow to blue light depending on the cloud temperature.

Usage, Equipment and supplies, Satellite imaging, United States. National Oceanic and Atmospheric Administration, Meteorological instruments, Clouds, Clouds (Meteorology), Meteorological satellites

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