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home > Forecast Research Department > The 4th Research Laboratory > Hydrometeor Videosonde (HYVIS) Observation

Hydrometeor videosonde (HYVIS) observation

@MRI developed a hydrometeor videosonde (HYVIS) that provides vertical profiles of cloud and precipitation particles with sizes ranging from 10 m to 2 cm. This balloon-borne videosonde collects particles on a section of 35-mm-wide transparent film. Particle images are captured using two small video cameras with different magnifications and transmitted in real time to a ground station. Balloon-based observation of vertical penetration through clouds with the HYVIS is very useful for in-situ cloud measurement, and helps to clarify cloud formation and precipitation mechanisms.

@The first major advantage of balloonborne instruments over other microphysical equipments is the accessibility they provide to low orographic clouds and/or severe convective clouds where research aircraft operation is problematic due to safety regulations. The second advantage is that the HYVIS can easily reach even the highest clouds, such as the cirrus type, which are difficult for most propeller research aircraft to access. The third advantage is that the HYVIS can take images with sufficient resolution to allow observers to distinguish between cloud droplets and ice crystals smaller than 100 m and to understand the characteristics of such crystals. The forth advantage is that the HYVIS can obtain high-resolution vertical distributions of hydrometeors.

@Taking advantage of these merits, the HYVIS has been used in several field projects to study various types of clouds, such as snow clouds over the Sea of Japan, warm frontal clouds, cirrus clouds and orographic snow clouds.

HYVIS observation
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