Tropical Storm Arlene formed Thursday afternoon in the Central Atlantic Ocean, around 800 mile west of the Azores. Satellite estimates indicated maximum sustained winds of 45 mph. The lifespan of Arlene has been short; the storm has already transitioned to an extra-tropical low pressure center (non-tropical) this morning.
— NHC Atlantic Ops (@NHC_Atlantic) April 21, 2017
The system first formed into a subtropical depression Wednesday morning. Longtime National Hurricane Center Senior Hurricane Specialist Lixion Avila noted in his forecast discussion Thursday afternoon, “I have to add one more surprise to my long hurricane forecasting career. Unexpectedly, the subtropical cyclone became a tropical depression this morning, and then it intensified to a tropical storm.”
— WeatherNation (@WeatherNation) April 20, 2017
Avila also stated, “Tropical storms in April are rare and Arlene is only the second one observed in this month during the satellite era. It should be noted, however, that this type of storm was practically impossible to detect prior to the weather satellite era.”
Before Arlene, there have only been four April tropical systems on record; the most recent Tropical Storm Ana in 2003. The other three were tropical depressions in 1992, 1981 and 1973.
Arlene has become embedded within the circulation of a larger extra-tropical low pressure system and has lost most of the thunderstorms around the center. It is also surrounded by cold air, diminishing tropical characteristics.
For WeatherNation: Meteorologist Mace Michaels
The time around Christmas looks like it will be colder than average for much of the country and potentially wetter.… https://t.co/FuDnoB9oKv3 hours ago by WeatherNation
https://t.co/7u4oxasPks The stretch of beautiful weather in the northwest is about to end. But some good things will happen.6 hours ago by WeatherNation
Wow. Unbelievable footage shows birds flying away from intense flames seen near Summerland, California as the… https://t.co/W8kMLwslgO6 hours ago by WeatherNation
DRIVE CAREFULLY - Check out this video from Cleveland, Ohio earlier on Thursday. Snow shower chances continue into… https://t.co/n3Su8X7NEX7 hours ago by WeatherNation
The next generation of polar orbiting satellites, specializing in water cycles (floods, droughts, precipitation) an… https://t.co/2bAz70HMP48 hours ago by WeatherNation