WTPQ81 PGUM 241019 HLSPQ1 URGENT - IMMEDIATE BROADCAST REQUESTED Tropical Depression Krosa (12W) Local Statement National Weather Service Tiyan GU 819 PM ChST Thu Jul 24 2025 ...A SLOWLY INTENSIFYING TD KROSA WEST OF SAIPAN MOVING NORTH... ...TD KROSA COULD BECOME A TROPICAL STORM FRIDAY WEST OF ANATAHAN... .NEW INFORMATION... None. .AREAS AFFECTED... This local statement provides important information and recommended actions for people in the Commonwealth of the Northern Mariana Islands. .WATCHES/WARNINGS... A Tropical Storm Watch continues for Rota, Tinian, and Saipan. Tropical storm conditions are possible Friday for Rota, Tinian and Saipan, depending on how quickly 12W intensifies once it has passed to the northwest of the islands. All persons in the watch areas should continue preparations for low-end tropical storm conditions as indicated by your local forecast and additional details, found below, for your island. A Flood Watch remains in effect for all of Guam and the Northern Marianas. Please listen closely for any Flood Warnings that might be in effect for your area. Please check the latest public and marine forecasts for detailed information about additional hazards. .STORM INFORMATION... At 7 PM ChST...the center of Tropical Depression Krosa (12W) was located near latitude 15.5N...longitude 143.5E. This was about 165 miles north-northwest of Guam and 150 miles west of Saipan. Storm motion was north, 350 degrees, at 15 mph. Storm intensity remains at 35 mph. .SITUATION OVERVIEW... Tropical Depression Krosa has made a slight turn toward the north and is moving at 15 mph. Currently west of Saipan, it will continue to move along a northerly course to keep west of the Marianas island chain. The bulk of rainfall and strong winds remains in the eastern and southern periphery and will persist over the islands for several days, despite TD Krosa having made its closest point of approach (CPA) to Rota, Tinian and Saipan. Again, worsening conditions including strong winds, gusts, and heavy rains will be felt after CPA. Showers, occasionally heavy, and increasing south to southwest winds and strong gusts will spread over the southern CNMI islands today and onward to the far northern islands Friday and Saturday. A Tropical Storm Watch is in effect based on the potential for Krosa to intensify to a tropical storm Friday as it heads northward, staying west of the CNMI. .PRECAUTIONARY/PREPAREDNESS ACTIONS... For those under a watch, continue preparations for your home or business according to your typhoon disaster plan. Listen for possible warnings and be ready to evacuate if necessary if your location is vulnerable to tropical storm conditions. Heed the advice of local officials and comply with any orders that are issued. For interests at ports, docks, and marinas, it is recommended that you perform the prescribed preparations according to your emergency operations plan for tropical cyclones. If you live on a boat, safely secure your craft and make plans to leave it for adequate land-based shelter. Listen for possible warnings. Regarding the coastal waters under a watch, small craft should return to port or seek safe harbor. Closely monitor NOAA weather radio or other local news outlets for official storm information. Listen for possible changes to the forecast. For additional precautionary and preparedness information, please refer to the detailed recommendations relative to your location as further described by your local emergency management office. && .NEXT UPDATE... The next local statement will be issued by the National Weather Service in Tiyan around 3 AM...or sooner if conditions warrant. MPZ001>003-241800- /O.CON.PGUM.TR.A.4012.000000T0000Z-000000T0000Z/ Rota-Tinian-Saipan- 819 PM ChST Thu Jul 24 2025 ...TROPICAL STORM WATCH REMAINS IN EFFECT... ...PRECAUTIONARY/PREPAREDNESS ACTIONS... Preparations should be made as soon as possible before conditions deteriorate and should be focused on the potential for tropical storm force winds of 39 mph or greater. Keep informed while listening for possible warnings. Secure loose outdoor objects which can be blown around. Strongly consider evacuating if you live in a metal roof or container home, and do so if ordered by local officials. && ...WIND INFORMATION... As Tropical Depression Krosa continues to intensify, the threat for sustained tropical storm force winds will increase slightly. Current forecast track and intensity guidance suggests tropical storm winds of 39 mph and greater look to stay just west of the coastal waters. However, a prolonged strong wind event post Krosa will be due to the strong southwest monsoon following behind Krosa. Moving forward, south winds will continue to increase, becoming increasingly gusty, then will shift to southwest Friday through Saturday, approaching tropical storm force with winds around 30 mph with gusts to around 45 mph. Due to the ensuing southwest monsoon in the wake of Krosa, winds will be slow to subside, possibly not until sometime later Saturday. ...COASTAL INUNDATION AND SURF INFORMATION... As Krosa continues northward west of the islands, larger surf will build along south and west facing reefs tonight, reaching hazardous levels of 10 to 14 ft. Surf could increase another couple of feet, depending on Krosa's motion and the overall wind field. Hazardous surf will maintain a high risk of rip currents, so folks should stay out of the waters. Surf could build and become hazardous with a high rip risk along north facing reefs over the weekend as the swell becomes more west to possibly west- northwest. Based on current wind and surf projections, coastal inundation could reach up to around 1 ft, focused more around times of high tide. Elevated surf will continue through the weekend before eventually subsiding. ...OTHER STORM EFFECTS... A Flood Watch is in effect for all 3 islands. Heavy rains will build in tonight and will continue, even as Krosa later moves away from the islands, due to the onset of a very wet southwest monsoon flow. Currently, 8 to 12 inches of rain is possible through Saturday night, and periods of very heavy rainfall may result in localized flooding. Additionally, the risk of mudslides could increase with a prolonged multi-day heavy rain pattern. ...AGRIHAN...PAGAN AND ALAMAGAN... ...TROPICAL STORM WATCH REMAINS IN EFFECT.. .PRECAUTIONARY/PREPAREDNESS ACTIONS... Residents should keep aware of the latest trends regarding TD 12W. The latest track depicts a passage to the west of the islands with tropical storm conditions possible by midday Friday. Preparations should focus on securing loose items with anticipation for southerly tropical storm winds of up to 50 mph. .WIND INFORMATION... The latest forecast track shows Krosa moving generally northward through Friday, then turn slightly to the north-northeast over the weekend, but staying the west of the islands. This will cause southeast winds to shift to south and increase tonight and Friday, becoming increasingly gusty as more widespread showers arrive Friday. Latest forecast projections show south tropical storm winds of 35 to 40 mph arriving by Friday afternoon and gradually shifting to southwest Saturday, before diminishing sometime Sunday. Even then, a strong southwest monsoon pattern will prolong windy conditions through Sunday night. .COASTAL INUNDATION AND SURF INFORMATION... Surf will initially rise along south facing reefs Friday, then spread to west facing reefs Saturday, exceeding hazardous levels of 9 ft. Surf along these windward shores could approach dangerous levels of 15 ft Saturday and Sunday and remain at hazardous levels of 10 to 14 ft into early next week due to the persistent monsoon flow. Rip currents during this time will be strong and life threatening. Stay out of the water. Minor wind and wave-driven coastal inundation of 1 to 2 feet will be possible along windward shores, especially around times of high tide as surf reaches peak heights Saturday and Sunday. .OTHER STORM EFFECTS... Scattered showers will persist tonight but will increase beginning around midday Friday, becoming locally heavy Saturday and Sunday as 12W passes to the west. Rainfall amounts of 8 to 12 inches are possible between Friday and Monday. Even after Krosa begins to move away Sunday and Monday, a wet monsoon pattern will prolong showers across the islands. $$ Slagle