Irma hurricane track live6/7/2023 light wind shear). Hurricane Irma shown using red hurricane symbol. Image is vertical wind shear in knots, with black and dark blue being most favorable for tropical cyclone intensification (i.e. 2Upper-level flow (white lines with arrows), based on satellite estimates of 200 mb winds (40,000 ft AGL). 1National Hurricane Center’s 5-day forecast probability for a tropical disturbance emerging off the west African coast on August 27th. Sea surface temperatures were above average (generally in the lower to mid 80s F across the tropical Atlantic), and there was an area of light winds in the upper atmosphere, which allowed the developing storm circulation to grow vertically deep (Fig. In late August and early September, however, the atmospheric and oceanic conditions in the tropical Atlantic were favorable for tropical cyclone development. This can be due to a number of factors, including blasts of dry, stable air from the Saharan desert, strong upper-level westerly winds, or a lack of the necessary atmospheric “spin” needed to generate a counterclockwise circulation. Such disturbances move off the African coast every few days during August and September, however, most of them fail to develop into tropical cyclones. Like many of the most notorious Atlantic hurricanes, Irma began as a weak wave of low pressure accompanied by disorganized showers and thunderstorms which emerged off the west African coast on August 27 th, near the peak of the Atlantic hurricane season (Fig. Hurricane Irma was a classic Cape Verde hurricane that will long be remembered for its severity and wide-ranging impacts to several islands in the Caribbean Sea and Florida.
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