A tropical disturbance, JTWC Invest Area 93W, is now the subject of a Tropical Cyclone Formation Alert by the Joint Typhoon Warning Center. This means that 93W is likely to develop into a tropical depression within the next 24 hours (by Monday afternoon).
At 4 pm ChST Sunday afternoon, 93W was centered 205 miles south-southeast of Guam near 10.6N 145.5E, moving west-northwest at 16 mph. As currently forecast, 93W will continue toward the WNW, keeping south and southwest of Guam tonight and Monday morning.
93W remains a weak, but developing circulation. Although it is likely to become a tropical depression in the coming days, this circulation will keep its distance from Guam and the CNMI.
However, strong trades exist across the northern semicircle of 93W, spanning across all of Guam and the CNMI. Neither tropical storm nor typhoon watches/warnings are expected for any islands as this system passes.
What to expect across Guam and the CNMI: Strong winds, hazardous seas and surf, and locally heavy rainfall.
Breezy northeast winds of 15 to 25 mph with gusts of 30-35 mph tonight will increase on Monday, shifting to the east-southeast and building to between 20 and 25 mph with gusts to near gale-force of 35 mph. Surf of 9 to 12 feet along north to east facing reefs will be hazardous, generating dangerous rip currents through Tuesday. Three to five inches of rainfall is possible tonight through Tuesday night, with locally higher amounts possible.
Actions to take
As a general precaution during high wind events, secure loose items such as tents, canopies and tarps. Strong gusty winds could be problematic for these and other loose outdoor items. Make sure they are secured, or take them down until conditions improve by midweek. Keep in mind: any Christmas decorations in your yard or on your house. This includes Christmas lights and inflatable decorations that may be pummeled by the wind and rain.
NWS Guam: https://www.weather.gov/gum/
NWS Guam Public Forecasts: https://www.weather.gov/gum/PublicForecasts
NWS Guam Tropical Cyclones Page: https://www.weather.gov/gum/Cyclones
NWS Guam Facebook: https://www.facebook.com/NWSGuam and Twitter: https://www.twitter.com/NWSGuam
Guam Homeland Security/Office of Civil Defense: www.ghs.guam.gov and www.facebook.com/GHSOCD
CNMI Homeland Security and Emergency Mgmt: www.cnmihsem.gov.mp and www.facebook.com/cnmieocswp