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My source for satellite imagery in the birdseye view blog posts on the home page.

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Interactive satellite image page. When Atlantic tropical cyclones transition into non-tropical systems that head far north, I like to include a snippet of this imagery as an inset into the birdseye view charts on the home page.

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Click on "#### UTC surface analysis" at this link to view the latest analysis of surface pressures done by the National Hurricane Center. This map shows the latest locations of tropical cyclones in relation to surface low pressures (marked by red Ls) and surface high pressures, also called "ridges" (marked by blue Hs). I use a snippet of this analysis map in my daily birdseye view blog posts on the home page.

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Surface pressure charts of the far north Atlantic and Europe. When Atlantic tropical systems lose their tropical characteristics and head far north, this is my place for checking on them.

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Go to the "upper air" section of this link, the lower the number (in millibars, or "mb", of pressure) the higher up in the atmosphere the chart represents. I select the 200 mb chart at 0 hours to obtain the current state very high up in the atmosphere where the pressure is so low that it is only 200 mb (to have an idea how high that is, at the surface typical pressure is 1010 mb). Upper level winds have a huge influence on tropical development, which is why this chart is included in my daily birdseye view blog posts on the home page.

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A tropical cyclone (tropical depression, storm, or hurricane) is not scientifically considered a cyclone till it has a closed circulation. Because tropical cyclones tend to form over open water where it is hard to obtain surface observations from a weather station, this tool is useful for tropical cyclone forecasters to determine if a closed circulation is in progress within a disturbance suspected of tropical development. The data presented at this link is from satellite sensors measuring surface wind direction and speed.

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Place to view computer model runs. Each day during the hurricane season, I check the GFS (Global Forecast System from the United States), CMC (Canadian), ECMWF (European), and NAVGEM (US Navy Global Environmental Model) to aid in my forecasting on the birdseye view blog posts on the home page.

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The tropical cyclone page from the Naval Research Laboratory is a great place to check not only for Atlantic tropical cyclones, but tropical cyclones in other oceans. Each tropical cyclone will have a zoomed-in satellite image and a forecast track graphic. Disturbances that are suspected of developing into a tropical cyclone will also be displayed here once they reach "Invest" status (the invest meaning that additional resources such as special computer model runs and satellite imagery, or in the case of the Atlantic basin aircraft reconnaissance, are being invested in the disturbance). All global invests are designated a number between 90 and 99, with Atlantic Invests having the letter "L" as a suffix after the number.

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