Tropical Depression 21E strengthened overnight on Oct. 30 and by Halloween morning, Tropical Storm Vance was haunting the waters of the Eastern Pacific Ocean. In a false-colored infrared image from NASA's Terra satellite on Oct. 31, the strong thunderstorms around the center resemble a pumpkin.
Tropical Depression 21E formed on Oct. 30 after struggling for days as a low pressure area. Just a day later it strengthened into a tropical storm and was renamed Vance.
NASA's Terra satellite passed over Vance on October 31 at 4:55 UTC (12:55 a.m. EDT) – the witching hour – and the Moderate Resolution Imaging Spectroradiometer or MODIS instrument aboard Terra captured infrared data.
That infrared data was false-colored when the image was created. High, strong thunderstorms with cold cloud top temperatures that circled the center were false-colored in an orange-red color, and resembled the shape of a pumpkin with a stem!
At 5 a.m. EDT, Tropical Storm Vance's maximum sustained winds were near 45 mph (75 kph) and is expected to strengthen gradually. Vance was centered near latitude 10.5 north and longitude 101.0 west.
That's about 450 miles (720 km) south of Acapulco, Mexico. Vance is moving toward the west-southwest near 3 mph (6 kph) and is forecast to turn to the west and west-northwest on Nov. 1.
National Hurricane Center Forecaster Dan Brown noted that Vance's center was near the southern edge of the large mass of deep convection due to moderate south-southwesterly shear.
The shear and some dry low- to mid-level air are expected to continue to affect the tropical cyclone during the next 12 to 24 hours, and only gradual strengthening is expected during that time.
Most of the intensity guidance shows Vance becoming a hurricane in 2 to 3 days.
NASA's Goddard Space Flight Center
Rob Gutro | EurekAlert!
Further reports about: > EDT > Goddard Space Flight Center > Hurricane Center > MODIS instrument > Moderate Resolution Imaging Spectroradiometer > National Hurricane Center > Tropical Depression > infrared data > low pressure area > strong thunderstorms > tropical > tropical cyclone > tropical storm
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