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Posts tagged Borders

Area of Convection Over Gulf of Carpentaria, Australia

15.7S 139.0E

January 27th, 2013 Category: Tropical Storms

Australia – January 26th, 2013

An area of convection hangs over the Gulf of Carpentaria, between the Northern Territory and Queensland, Australia. Warning centers have not reported any concern over the system developing into a tropical storm. Although the convection covers the gulf, its shoreline can be seen thanks to the use of the Chelys Satellite Rapid Response System (SRRS) “borders” feature (best observed in full image).

New Borders Feature in Action – January 27th, 2013 – EOSnap Celebrates its 6000th Post!

22.5N 31.7E

January 27th, 2013 Category: Clouds, Image of the day, Lakes

Egypt and Sudan – January 26th, 2013

Bolivia and Peru – January 26th, 2013

Mozambique – January 26th, 2013

USA – January 26th, 2013

Egypt, without borders

EOSnap celebrates our 6000th post by focusing on the new “borders” feature of the Chelys Satellite Rapid Response System (SRRS). The feature allows users to download satellite images that show not only a true, traditional view of the terrain below, but also the borders of countries. The feature is particularly useful for seeing the outline of land despite cloudcover. It can also be used to show the location of lakes.

In the main image, the border between Egypt and Sudan is clearly visible as a horizontal line. The contours of Lake Nasser, which would otherwise be invisible except for its southern tip due to heavy cloud cover (see thumbnail image “Egypt, without borders” for a look at the original, borderless image), are easily distinguishable, highlighted in blue. The thumbnail image of Mozambique shows the country’s shoreline despite an area of convection, in this case a potential area of cyclone formation, looming over the coast. The thumbnail image of Bolivia and Peru focuses on Lake Titicaca, and clearly shows where the lake is divided between the two countries. The thumbnail image of southern USA, in addition to sediments from the Mississippi River, shows the border between Louisiana (right) and Texas (left), as well as the Toledo Bend Reservoir, despite the thick clouds covering the upper half of the image.

Area of Convection Continues Near Madagascar and Mozambique

January 22nd, 2013 Category: Tropical Storms

Area of Convection – January 21st, 2013

Enhanced image

Track of Area of Convection - January 21st, 2013 © Univ. of Wisconsin

Track of Area of Convection

The area of convection previously located near 24.7S 37.5E (click here for previous images) is now located near 23.6S 38.8E, approximately 535 nm southwest of Antananarivo, Madagascar, and east of Mozambique. In the full image, the outline of the coast of Mozambique can be observed in grey, through the convection.

Animated infrared satellite imagery depicts an exposed low-level circulation center (LLCC) with deep convection sheared southeast of center. A WINDSAT 37 ghz image indicates shallow convective banding wrapping tightly into an elongated LLCC. An ASCAT image depicts a highly asymmetric wind field with 30 to 35 knot winds. Upper-level analysis indicates that the LLCC is located east of the subtropical ridge and is embedded within the upper-level trough.

The system is under strong northwesterly vertical wind shear (20 to 30 knots) and is positioned just equatorward of the subtropical jet and strong northwesterly flow (50 to 70 knots), which is providing excellent poleward outflow. The system is assessed as subtropical and has potential to transition into a warm-core system within the next two to three days as it tracks slowly eastward.

Dynamic models indicate that the subtropical ridge will re-build over the LLCC and the total precipitable water imagery indicates a deep moisture core sufficient for further development. Maximum sustained surface winds are estimated at 30 to 35 knots. Minimum sea level pressure is estimated to be near 1000 mb. The potential for the development of a significant tropical cyclone within the next 24 hours remains medium.

Area of Convection Over Gulf of Carpentaria Has Medium Chance of Becoming Cyclone

January 21st, 2013 Category: Tropical Storms

Area of Convection – January 20th, 2013

Enhanced image

Track of Area of Convection - January 20th, 2013 © Univ. of Wisconsin

Track of Area of Convection

An area of convection is located near 16.6S 136.9E, approximately 425 nm southeast of Darwin, Australia.

Animated enhanced infrared satellite imagery shows a steady increase in deep convection over the northern half of a poorly defined low level circulation center (LLCC). The LLCC continues to track eastward towards the Gulf of Carpentaria, but currently remains over land. In the full image, the outline of the gulf can be observed in grey, through the convection, due to the use of the Chelys Satellite Rapid Response System (SRRS) “borders” feature.

Radar imagery from Mornington Island, Australia supports the LLCC approaching the coast. Upper level analysis indicates the LLCC is located poleward of a subtropical ridge axis and in a region of weak upper level convergence, which is hampering outflow. Observations in the vicinity of the LLCC indicate a central pressure of approximately 998 mb.

Maximum sustained surface winds are estimated at 15 to 20 knots. Minimum sea level pressure is estimated to be near 998 mb. Based on the persistent deep convection and the LLCC approaching the Gulf of Carpentaria, the potential for the development of a significant tropical cyclone within the next 24 hours is upgraded to medium.

Tropical Storm Wukong (27W) by Philippines

12.5N 126.7E

December 26th, 2012 Category: Tropical Storms

Tropical Storm Wukong (27W) – December 25th, 2012

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Track of Tropical Storm Wukong (27W) - December 25th, 2012 © Univ. of Wisconsin

Track of TS 27W

Tropical Storm Wukong (27W) located approximately 285 nm south-southwest of Manila, Philippines, has tracked west-southwestward at 14 knots over the past six hours. Here, the system can be seen encroaching on the Philippines, whose borders are visible despite the convection covering them due to the use of the Chelys Satellite Rapid Response System (SRRS) “borders” feature.

Animated enhanced infrared satellite imagery shows the low level circulation center has become fully exposed and ragged as the main convection was sheared almost 200 nm to the north. The same animation shows the convective tops have significantly warmed as the bands unraveled and dispersed. Maximum significant wave height is 11 feet.

Upper level analysis indicates the system is 05 degrees south of the ridge axis in an area of moderate to strong (20-30 knot) southerly vertical wind shear (VWS). The cyclone is tracking along the southern extension of a deep-layered subtropical ridge to the north. The system is expected to dissipate in 12 hours due to the high VWS, exacerbated by a cold northeasterly surface wind surge in the South China Sea.