NASA satellite finds a wedge-shaped Tropical Storm Paulette
Wind shear was affecting both Tropical Storm Paulette and Rene in the Atlantic Ocean on Sept. . Infrared imagery from NASA s Aqua satellite showed that strong southwesterly wind shear pushed against Paulette creating a wedge-shaped storm.
Tropical cyclones that appear less than round are likely being affected by wind shear or outside winds transitioning into an extra-tropical cyclone or taking on the elongated appearance of a weather front. Today, Sept. , wind shear has given Paulette a wedge-shape.
The shape of a tropical cyclone provides forecasters with an idea of its organization and strength. When outside winds batter a storm, it can change the storm s shape. Winds can push most of the associated clouds and rain to one side of a storm.
In general, wind shear is a measure of how the speed and direction of winds change with altitude. Tropical cyclones are like rotating cylinders of winds. Each level needs to be stacked on top each other vertically in order for the storm to maintain strength or intensify. Wind shear occurs when winds at different levels of the atmosphere push against the rotating cylinder of winds, weakening the rotation by pushing it apart at different levels.
At a.m. EDT UTC on Sept. , Paulette continues to experience the effects of to knots of southwesterly vertical shear, which has caused the center to occasionally become exposed to the south and southwest of the primary convective bursts, noted Jack Beven, Senior Hurricane Specialist at NOAA s National Hurricane Center in Miami, Fla.
NASA s Aqua satellite uses infrared light to analyze the strength of storms by providing temperature information about the system s clouds. The strongest thunderstorms that reach high into the atmosphere have the coldest cloud top temperatures.
On Sept. at : a.m. EDT UTC, the Moderate Resolution Imaging Spectroradiometer or MODIS instrument that flies aboard NASA s Aqua satellite revealed a very small area of Paulette s most powerful thunderstorms around its center where cloud top temperatures were as cold as minus degrees Fahrenheit minus . Celsius. A larger area of strong storms with cloud top temperatures as cold as minus degrees Fahrenheit minus .. degrees Celsius surrounded the center. NASA research has found that storms with cloud tops as cold as at least minus degrees Fahrenheit can generate heavy rain.
At a.m. EDT on Sept. , NHC noted that the wind shear Paulette is currently experiencing should subside. However, it may be another hours before it subsides enough so that significant strengthening can occur.
At a.m. EDT UTC, the center of Tropical Storm Paulette was located near latitude . degrees north and longitude . degrees west. That is about miles , km east-northeast of the Northern Leeward Islands. Paulette is moving toward the west-northwest near mph kph. Maximum sustained winds are near mph kph with higher gusts. Little change in strength is expected today. The estimated minimum central pressure is millibars.
NHC forecasters expect a motion toward the northwest for the next few days. On the forecast track, the center of Paulette should approach Bermuda Sunday night and Monday. Gradual strengthening is expected to begin tonight or on Saturday, and Paulette is forecast to become a hurricane this weekend.
Swells generated by Paulette are expected to reach portions of the Leeward Islands today and will continue to spread westward to portions of the Greater Antilles, Bahamas, Bermuda, and the southeastern United States into the weekend. These swells are likely to cause life-threatening surf and rip current conditions.
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