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Polní laboratoř

Meteorologická stanice sledující fyzikální parametry atmosféry a základní hydrologii Lysického potoka

Cumulus mediocris, Cirostratus, Stratocumulus 10. 8 . 2014, 10:10 UTC, NEN,
Standardní meteorologická budka – Bořitov 10. 8 .2014.
Cirocumulus, cirus fibratua, cumulus humilis a cumulus mediocris. Foto 10. 8. 2014 v 10:11 UTC

NASA Satellite Spots a Weakening Karina, Now a Tropical Storm

NASA's Terra satellite passed over Hurricane Karina before it weakened to a tropical storm early on August 15 and imagery showed the vertical wind shear was already taking its toll. NASA's Terra satellite passed over Karina on August 14 at 2:40 p.m. EDT when it was still clinging to hurricane status and noticed that wind shear was already having an effect on the storm's structure. The Moderate Resolution Imaging Spectroradiometer or MODIS instrument captured an image that showed that the bulk of Karina's clouds were being pushed to the western side of the storm. That was an indication that vertical wind shear was moderate to strong and it continued weakening the storm. On August 15, Karina continued to experience 20 to 25 knots of easterly vertical wind shear, which has caused the center to become partly exposed on the eastern side of the deep convection (rising air that forms the thunderstorms that make up the tropical storm). A tropical storm has maximum sustained wind speed between 39 and 73 mph. By 5 a.m. EDT (0900 UTC) on August 15, Karina's maximum sustained winds had decreased to 70 mph (110 kph) and the National Hurricane Center expects additional weakening over the next two days. Karina's center was located latitude 17.2 north and longitude 119.1 west, about 715 miles (1,150 km) west-southwest of the southern tip of Baja California, Mexico. Karina was moving toward the west near 12 mph (19 kph) and is expected to turn to the west-northwest. The estimated minimum central pressure is 990 millibars. Wind shear is expected to decrease while Karina moves over sea surface temperatures of near 26C (80F). Tropical cyclones need sea surface temperatures of at least 26C/80F to maintain strength. The National Hurricane Center noted, "this could allow Karina to re-intensify as forecast by the GFDL and the Navy COAMPS computer forecast models. However, any deviation north of the forecast track would take the system over colder water, which would prevent strengthening."

Tropical Storm Karina Forms in Eastern Pacific Near Socorro Island

Socorro Island in the Eastern Pacific received an unwelcome tropical visitor on the morning of August 13 when satellite data confirmed the formation of Tropical Storm Karina. Karina strengthened from the eleventh tropical depression in the Eastern Pacific. Tropical Depression 11-E formed at 11 p.m. EDT on August 12. Just twelve hours later at 11 a.m. EDT, the depression had become better organized and winds increased to tropical storm strength. NOAA's GOES-West satellite captured an infrared image of newborn Tropical Storm Karina approaching Socorro Island in the Eastern Pacific on August 13 at 1500 UTC (11 a.m. EDT). The GOES image was created by the NASA/NOAA GOES Project at NASA's Goddard Space Flight Center in Greenbelt, Maryland. Forecaster Stewart at NOAA's National Hurricane Center noted that deep convection has continued to increase with cloud tops of -80C to -84C (-112F to -119.2F) just west of the low-level center. Infrared data is used to help determine cloud top temperatures. One of NASA's instruments that analyze tropical cyclones is the Atmospheric Infrared Sounder or AIRS instrument that flies aboard NASA's Aqua satellite. In August 13 at 8 a.m. PDT (11 a.m. EDT/1500 UTC) the center of Tropical Storm Karina was located near latitude 17.2 north and longitude 111.0 west. That's about 110 miles (180 km) south of Socorro Island. Socorro is a small volcanic island and is part of Mexico's Revillagigedo Islands. It is located about 370 miles (600 km) west of mainland Mexico. Karina's maximum sustained winds were near 40 mph (65 kph) and the National Hurricane Center (NHC) expects strengthening over the next two days as it moves west. The estimated minimum central pressure is 1005 millibars. Despite the vertical wind shear that is currently affecting the system, it still managed to strengthen and organize into a tropical storm. The National Hurricane Center forecast calls for that wind shear to slowly subside over the next 4 to 5 days while the Karina remains over warm sea surface temperatures of 28-29C, so steady intensification appears likely. NHC expects Karina to reach hurricane strength on August 16.

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