While no tropical storms are expected to form over the next few days, the National Hurricane Center is now spotlighting the northwest Caribbean as a place to watch as broad low pressure forms over Father's Day weekend. Tropical Storm Arlene formed in the Central Atlantic on April 20 and remained far out at sea, but it was only the second recorded instance of a tropical storm forming in April.
This system is no threat to the US mainland.
"Regardless of the strength of this system, heavy rain will impact coastal regions of southern Mexico through the middle of the week", said AccuWeather Senior Meteorologist Matt Rinde.
At 5 a.m. EDT (0900 UTC), the center of Tropical Depression Calvin was located near latitude 16.3 North, longitude 96.3 West. "Some gradual development of this system is possible thereafter while it moves slowly northwestward".More news: 'Wonder Woman' soars in its second weekend as 'The Mummy' staggers
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Tropical storm warnings have been posted over parts of the southeastern Mexican coast from Boca de Pijijiapan to Punta Maldonado. Calvin has a minimum central pressure of 1007 hPa and is tracking west-northwest at around 6 miles per hour (9 km/hr).
An evening bulletin from the U.S. National Hurricane Center said Calvin was making landfall on the coast of Oaxaca state.
The depression is expected to produce total rainfall accumulations of 5 to 10 inches across southern Guatemala and the Mexican states of Chiapas, Oaxaca, and Guerrero, with maximum totals of 20 inches possible.
Additional weakening is forecast, and Calvin is expected to dissipate over the mountainous terrain of southern Mexico later today, June 13.