Saipan and Tinian remained in severe drought (D2) for most of April but degraded to extreme drought (D3) at the end of April as the seasonally dry trade-wind pattern continued. Both locations experienced several weeks of low precipitation and continued to the necessary monthly 4 inches of precipitation needed to meet minimum water needs.
Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS GUM wrote it up.
Saipan and Tinian remained in severe drought (D2) for most of April but degraded to extreme drought (D3) at the end of April as the seasonally dry trade-wind pattern continued. Both locations experienced several weeks of low precipitation and continued to the necessary monthly 4 inches of precipitation needed to meet minimum water needs.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Guam wrote its last area forecast discussion before the first event at Mar 31, 7:56 AM UTC, 6 hours 4 minutes earlier.
Area Forecast Discussion National Weather Service Tiyan GU 556 PM ChST Mon Mar 31 2025 .Marianas Synopsis... Himawari visible satellite shows partly cloudy skies and spotty showers across the area, mainly over Guam and Rota coastal waters. A broad, low-level cloud band is seen east of Saipan and Tinian, leftover from a remnant shear line fragment. Surface observations and ASCAT show mostly fresh trade winds this afternoon with frequent strong gusts. && .Discussion... CIMMS Mimic Precipitable Water (PWAT) imagery shows drier air working its way west over the CNMI this afternoon with a weak north-south gradient in moisture across the islands. This lines up with current satellite imagery showing slightly more showers upstream of Guam and Rota than Tinian and Saipan, but given the negligible difference and model trends indicating a bump in showers near Tinian and Saipan overnight, overall shower coverage was left at isolated (20 percent chance). Later on, a passing trade-wind trough looks to increase showers over the Marianas around Wednesday night, starting off a slightly wetter second half of the week, but this will only be a temporary break in the mild trade-wind regime dominating the forecast period. The surge in trade winds near the Marianas will begin to diminish Tuesday as the subtropical ridge weakens north of the region, and mostly gentle to moderate trades are expected Wednesday through the end of the week. && .Marine/Surf... The Small Craft Advisory has been extended based on latest surface observations, scatterometry data, and model guidance, which indicate a continuation of fresh to strong trade winds which will maintain choppy seas hazardous to small craft through tonight. Nearby buoys and altimetry are showing combined seas of 6 to 8 feet, which are expected to continue through Tuesday night before falling into the 5 to 7 foot range through midweek. This will also maintain a high risk of rip currents for east facing reefs until Tuesday evening, while a moderate rip current risk for north facing reefs continues. Another pulse of long-period northeast swell will bring seas back up late in the week, which may reintroduce the high rip current risk for east reefs. Trade winds will follow a decreasing trend over the next few days, becoming gentle to moderate midweek onward. && .Eastern Micronesia... A series of trade-wind troughs is creating a broad area of fairly weak low-level convergence within Eastern Micronesia. This is promoting partly sunny skies with low-end scattered showers across Pohnpei and Kosrae, and isolated showers in Majuro. This will hold true through Tuesday night, then the scattered showers push northward into Majuro from the southern Marshall Islands. Then, on Wednesday, Kosrae gets a break to dry out. No such break is in store for Pohnpei though. On Thursday night Kosrae gets back into the soupy showers until Monday, while Majuro remains in the showery weather until Sunday, as the showers head westward toward Pohnpei and Kosrae. Pohnpei Waters will have winds of 15 to 20 knots through Wednesday night, then 10 to 15 knots. Seas will start at 5 to 7 feet tonight, then build to between 7 and 9 feet by Thursday. This could lead to challenging marine conditions, but should fall a bit short of hazardous. Kosrae Waters will see winds of 15 to 20 knots with occasional gusts of 25 knots tonight, then 10 to 15 knots Tuesday through Saturday, or the rest of the forecast period. Seas will start at 5 to 7 feet tonight, then build to between 6 and 8 feet Thursday. This could present challenging marine conditions tonight, but again they should fall a bit short of being hazardous. Majuro Waters will receive 15 to 20 knot winds through Thursday with occasional gusts to 25 knots Wednesday and Wednesday night. Winds will diminish to between 10 and 15 knots for Friday and Saturday, although occasional gusts to 25 knots will still be possible. Seas will start at 4 to 6 feet tonight, then build to between 6 and 8 feet by Thursday. This will present challenging conditions for small craft, but they again should fall a bit short of being hazardous. && .Western Micronesia... There is still weak diffluence over the main islands of Palau and Yap as flow redirects to convergence along the equator and up to 5N, and to a broad trough northwest of Yap Proper. Satellite shows mostly clear to partly cloudy skies over the islands and relatively quiet weather is expected through Wednesday, then a weak disturbance in a developing Near-Equatorial Trough (NET) where the area of convergence would shift northward towards Palau, but be mainly south of Yap. This is expected to bring increasing showers to Palau late week and over the weekend, although periods of scattered showers are still expected for Yap. Scattered showers will continue at Chuuk the next few days, with showers further increasing with the possibility of thunderstorms starting Tuesday night, as the aforementioned pattern allows a convergence zone to set up across central Micronesia as well. Combined seas are expected to remain 5 to 7 feet near Palau and Yap and 6 to 8 feet near Chuuk. A pulse of long-period northeast swell late this week may slightly add to seas near Chuuk, but will mainly contribute to an increase in surf heights along north and east facing reefs. At this time, this is not expected to reach hazardous levels of 12 feet for east-facing reefs, but may approach the threshold of 9 feet for north-facing reefs of Chuuk. && .GUM WATCHES/WARNINGS/ADVISORIES... GU...High Rip Current Risk through Tuesday afternoon for GUZ001. MP...High Rip Current Risk through Tuesday afternoon for MPZ001>003. Marianas Waters...Small Craft Advisory until 5 AM ChST Tuesday for PMZ151>154. && Marianas: DeCou East Micronesia: Stanko West Micronesia: Cruz
1 drought. Local standard time, as filed.
Saipan and Tinian remained in severe drought (D2) for most of April but degraded to extreme drought (D3) as the seasonally dry trade-wind pattern continued. Both locations experienced several weeks of low precipitation and continued to the necessary monthly 4 inches of precipitation needed to meet minimum water needs.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Guam in 2025Every state in 2025This day in weather historyWarnings in Guam, April 2025
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 1243446.