NASA's Aqua satellite captured a look at the depression just prior to its classification as a tropical storm. As showers and storms continue to impact the area, flooding will be a concern through Tuesday. On Monday afternoon, Calvin was about 70 miles (113 km) east-southeast of the coastal town of Puerto Angel in southern Mexico, according to the Miami-based NHC.
An evening bulletin from the U.S. National Hurricane Center said Calvin was making landfall on the coast of Oaxaca state.
Regardless of the system's strength, heavy rain is the main threat to Mexico and southern Guatemala.
Tropical Storm Beatriz soaked the same area with torrential rains in early June. The storm was blowing maximum sustained winds of 40 miles per hour (64 kph), and moving northwest at five miles per hour (three kph), the NHC added.
"The primary concern with this feature is going to be the potential for excessive rainfall over the southern part of the Mexican state of Oaxaca, as well as southeastern Guerrero and southwestern Chiapas", said Strait.
London Bridge Attacker Attempted to Rent Large Truck
As well as bags of gravel in the back of the van, there were 13 wine bottles full of lighter fluid and primed with rags as fuses. All three attackers were shot dead before they could make their way back to the van, which held a stash of Molotov cocktails.
The third tropical system of the Pacific developd and makes landfall near Salina Cruz Monday evening.
Calvin is also expected to produce rainfall totals of 4 to 6 inches in the Mexican states of Tabasco and Veracruz, as well as in southern Guatemala.
These rainfall totals could lead to life-threatening flash floods and mudslides in some areas into midweek.
Check back with us at weather.com for updates on this system.
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