The National Weather Service reports that Topical Depression 22W has formed east southeast of Guam.
A Tropical Storm Watch is now in effect for Guam. This means damaging winds of 39 mph or higher are possible Monday.
A Typhoon Watch is now in effect for Saipan, Tinian and Rota. This means damaging winds of 39 mph or more are possible Monday, and typhoon force winds of 74 mph or greater are possible Monday night or Tuesday morning.
At 1 PM ChST, Tropical Depression 22W was centered 785 miles east-southeast of Guam and 760 miles east-southeast of Saipan near 10.5N 156E moving west-northwest at 18 mph with maximum sustained winds of 35 mph.
TD 22W is forecast to strengthen as it continues on a west-northwest track toward the Marianas. As is currently forecast, TD 22W will pass through the Mariana Islands late Monday or early Tuesday as a typhoon. As is usually the case, changes in forecast track, timing and storm intensity are expected as new information comes in and numerical weather forecasts are updated.