A Tropical Storm Watch means that tropical storm conditions are possible within the watch area, generally within 48 hours.
On the heels of Hurricane Lane in the Pacific, Tropical Storm Olivia, now with winds as high as 65 miles per hour, is expected to move through the main Hawaiian islands of Hawaii, Maui and Oahu Tuesday evening, according to the Central Pacific Hurricane Center. The hurricane center downgraded Florence to a tropical storm later in the day. Tropical storm watches are in effect for Montserrat, St. Kitts and Nevis, Antigua, and Saba and St. Eustatius. A Category 4 hurricane at its strongest, Olivia spent about a week swishing around in the Pacific Ocean without making landfall before it weakened into a tropical storm.
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For its part, the tropical storm Helene, located southwest of the Portuguese Azores, has tilted its course to the north and must be maintained with a similar course and speed of translation over the waters of the eastern Atlantic.
Isaac is moving west at 21 miles per hour.
Jeff Byard, associate administrator for response and recovery at the Federal Emergency Management Agency (FEMA), had hours earlier warned that "24 to 36 hours remain for significant threats" from heavy rain, storm surge and flooding. It is not very well organized and has crossed the Lesser Antilles. The winds may increase a bit Saturday night, possibly gusting over 40mph, especially in the northern/eastern CSRA. A watch is typically issued 48 hours before tropical-storm-force winds are expected to arrive, which makes outside preparations hard or risky - and Tropical-storm-force winds are possible within the tropical storm watch area today.
However, forecasters say Isaac is expected to produce additional rainfall of 2 to 3 inches with isolated maximum totals of up to 5 inches across southeast Puerto Rico. These swells are likely to cause life-threatening surf and rip current conditions.