A strong westerly monsoon pattern persists across western Micronesia. The worst conditions are found between Yap and Chuuk and areas south. Satellite data has shown squalls racing southeastward at 30-40 mph, between 140E and 152E, bringing brief heavy showers, strong to damaging gusts, and rapidly spiking seas in the 10-15 ft range. Northwesterly flow between Yap and Chuuk will turn westerly Saturday, possibly increasing as 98W, currently near Chuuk, shifts farther west-northwest. The duration of this monsoonal flow and its impacts will be dependent on 98W and its motion. 98W is the subject of a Tropical Cyclone Formation Alert, meaning development of a tropical cyclone (tropical depression) is likely within 24 hours. For more information on Invest 98W, see bulletins issued by JTWC under WMO header WTPN21 PGTW. This monsoonal pattern will make inter-island travel hazardous and potentially dangerous at times so travel is discouraged through the rest of week and into the weekend. Watch out for high surf along west and north facing reefs and pay attention to surf and sea conditions. Residents across Yap and Chuuk States should continue to monitor local weather forecasts from the National Weather Service in Guam, and for additional information from your local Weather Service Office and emergency management. Visit weather.gov/gum/PublicForecasts for the latest weather information from the National Weather Service.