Live National Weather Service Guam warnings, watches and advisories, current conditions, radar and the tropics outlook for Guåhan and the Marianas. For an active tropical cyclone the page shows JTWC’s forecast track hour by hour, the point where that track passes closest to Guam, and NWS Guam’s public advisory with every watch and warning in effect. What the bulletins mean, per NWS Guam: a Tropical Storm Watch means 39–73 mph winds are possible within 48 hours; a Typhoon Watch means 74+ mph winds are possible within 48 hours; a Tropical Storm Warning means 39–73 mph winds are expected within 24 hours; a Typhoon Warning means 74+ mph winds are expected within 24 hours.