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Archive for November 8th, 2009

Antofalla Volcano and the Salar de Antofalla, Argentina – November 8th, 2009

25.8S 67.7W

November 8th, 2009 Category: Image of the day, Volcanoes

Argentina - September 29th, 2009

Argentina - September 29th, 2009

The Salar de Antofalla runs horizontally through this orthorectified image of northwestern Argentina. It is a large playa of over 140 km (87 mi) in length, appearing here as a long and flat light grey area.

A cluster of volcanoes can be seen in the upper left quadrant, west of the salar. One of the largest of these is Antofalla, a big and very remote stratovolcano in Catamarca Province. It is located on the edge of the Puna de Atacama, a high desert plateau east of the Atacama Desert.

Ida Near Hurricane Strength and Still Moving Northward

20.4N 85W

November 8th, 2009 Category: Tropical Storms

Tropical Storm Ida - November 6th, 2009

Tropical Storm Ida - November 6th, 2009

Track of Ida - November 7th, 2009 © Univ. of Wisconsin

Track of Ida

Enhanced image

Enhanced image

At 4:00 PM EST (2100 UTC) the center of Tropical Storm Ida was located near latitude 18.9 north, longitude 84.3 west, or about 200 miles (325 km) east-southeast of Cozumel, Mexico and about 195 miles (320 km) south of the western tip of Cuba. Here, Ida is visible near the Yucatan Peninsula, with Cuba and Florida, USA to the north.

Ida is moving toward the north near 10 mph (17 km/hr). A turn toward the north-northwest with a gradual increase in forward speed is expected during the next day or so. On the forecast track, Ida is expected to move through the Yucatan Channel on Sunday and into the southeastern Gulf of Mexico Sunday night.

Maximum sustained winds are near 70 mph (110 km/hr) with higher gusts. Ida is expected to become a hurricane Saturday or Sunday, but weakening is forecast after it enters the Gulf of Mexico. Tropical storm force winds extend outward up to 140 miles (220 km) from the center. Estimated minimum central pressure is 990 mb (29.23 inches).

Ida is expected to produce total rain accumulations of 3 to 5 inches over portions of the Yucatan Peninsula and western Cuba, with possible isolated maximum amounts of 10 inches. Rainfall amounts of 1 to 2 inches are also possible across the Cayman Islands.

A hurricane watch remains in effect for the Yucatan Peninsula of Mexico from Tulum to Cabo Catoche, meaning that hurricane conditions are possible within the watch area generally within 36 hours. A tropical storm watch is in effect for the Isle of Youth.

A tropical storm warning remains in effect for Grand Cayman Island and for the Yucatan Peninsula from Punta Allen northward to San Felipe, meaning that tropical storm conditions are expected within the warning area generally within 24 hours.

A tropical storm warning is also in effect for the Cuban province of Pinar del Rio. Hurricane force winds could spread across portions of western Cuba on Sunday and a hurricane warning may be required for this area later.

Tropical Storm 25W Tracks Eastward

23.0N 152.5E

November 8th, 2009 Category: Tropical Storms

Tropical Storm 25W - November 6th, 2009

Tropical Storm 25W - November 6th, 2009

Track of TS 25W - November 7th, 2009 © Univ. of Wisconsin

Track of TS 25W

Enhanced image

Enhanced image

Tropical Storm 25W, located approximately 570 nm west of Wake Island, has tracked eastward at 6 knots over the past six hours. Animated infrared imagery shows the system has generated deep, central convection that is starting to wrap into a partially exposed low level circulation center (LLCC).

An AMSU microwave image captures the wrapping convection but also indicates the presence of dry air to the southwest of the system center that may entrain and impact the system’s structure in the coming day or two.

In the upper levels, animated water vapor imagery indicates the system still has good poleward outflow, though it has waned slightly over the past 12 hours as the upper-level ridge located east of the system has built poleward.

TS 25W also sits in an area of moderate vertical wind shear (20 to 30 knots). The system is expected to track slowly northeastward along the western edge of the mid-level ridge and intensify over the next 12 hours.

Thereafter, TS 25W should gradually pull out to the northeast and dissipate by TAU 72 as it tracks over unfavorable sea surface temperatures and under hostile vertical wind shear associated with the mid-latitude westerlies. Maximum significant wave height is 11 feet.

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