KINGSTOWN, St. Vincent—La Soufriere volcano shot out another explosive burst of gas and ash on Friday as a cruise ship arrived to evacuate some of the foreigners who had been stuck on a St. Vincent island coated in ash from a week of violent eruptions. The explosions that began on April 9 forced some 20,000 to flee the northern end of the eastern Caribbean island for shelters and contaminated water supplies across the island. Friday morning’s blast “wasn’t a big explosion compared to the ones that we last weekend, but it was big enough to punch a hole through the clouds,” said Richard Robertson, lead scientist at the University of the West Indies Seismic Research Center, in an interview with local NBC radio. “Probably got up to 8,000 meters (26,000 feet).” During a comparable eruption cycle in 1902, explosive eruptions continued to shake the island for months after an initial …