Moderate to fresh trade-wind pattern across Micronesia, elevated the easterly swell around the Marianas, increasing surf and risk of rip currents along east facing reefs.
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.
Moderate to fresh trade-wind pattern across Micronesia, elevated the easterly swell around the Marianas, increasing surf and risk of rip currents along east facing reefs.
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 Apr 27, 9:02 PM UTC, 2 hours 58 minutes earlier.
Area Forecast Discussion National Weather Service Tiyan GU 702 AM ChST Fri Apr 28 2023 .Marianas Synopsis... The latest Doppler radar loop, supported by satellite imager, shows increasing shower coverage heading towards Guam and Rota. These showers are small in size though and should only "flirt" with scattered coverage for at least a few hours this morning. Seas remain near 6 feet based on the latest observations, with a water temperature of 84 degrees. && .Discussion... The previous forecast thinking remains in tact given good model and forecast continuity. In short, isolated showers will continue to dominate our weather in the Marianas/CNMI for the next few days, with the usual "uptick" in shower coverage seen between midnight and mid morning when shower coverage will be at its "greatest". Otherwise, depending how the synoptic pattern plays out, rainfall potential could increase next week. && .Marine... The biggest concern over the next few days are winds and seas, as they look to top out near 20 knots and 9 feet respectively, both of which are a couple of knots/a foot below advisory criteria. Still, aside from the westward (lee) side of the islands, mariners can expect choppy seas and fresh winds, which could make navigating a little challenging for smaller vessels. Also, the models have been running about half a foot to a foot high in the sea height predictions, but if this changes a brief/marginal high rip risk may develop for eastern reefs Saturday and Saturday night. Thought about increasing the rip risk to high to account for this, but given the trend noted in observations versus forecast, decided to "punt" to the day shift and let them re-evaluate this. && .Eastern Micronesia... A large band of trade-wind convergence dominates with embedded troughs will be the major player for the region. This should last through Saturday then pick back up again during the beginning of next week. Then the showers are expected to last through the end of next week. Seas are expected to remain benign at 6 feet or less. Winds a expected to remain gentle to moderate with Majuro possibly getting up to fresh from time to time starting around Sunday. && .Western Micronesia... For Chuuk, the trade-wind convergence and embedded troughs will be their major concerns. Showers expected for Weno through all next week with the heaviest being today and slowly tapering down near the end of next week. No dry days in sight form what the models show. For Yap, the remnants of invest 01W (Sanvu) have became a trough and is located southeast of Yap. Scattered showers and isolated thunderstorm are to be expected. Troughs are expected to continues to pass through the region keeping Yap in scattered showers through the end of next week. For Palau, the above trough is heading to you, it is expected to get there some time tonight or into the early morning hours. Like Yap, Koror will experience several troughs this coming week keeping them in scattered showers with isolated thunderstorms. Seas for the region are expected to be benign with combined seas being around 4 to 6 feet. Winds are expected to be gentle to moderate for Palau and moderate to fresh for Yap and Chuuk. && .GUM WATCHES/WARNINGS/ADVISORIES... GU...None. MP...None. Marianas Waters...None. && Marianas: Doll Micronesia: Bowsher
1 high surf. Local standard time, as filed.
A group of swimmers at the norther side of Marine Beach where caught by a large wave around 1300ChST on Saturday, April 29th. Most of the group was able to make it back to shore, but a 14-year-old male was swept into open water. Emergency services were notified shortly after the event, but were unable to recover the male.
As the offices recorded each death: direct deaths were caused by the weather itself, indirect ones by something it set in motion.
| Event | Date | Age | Sex | Where | Kind |
|---|---|---|---|---|---|
| High Surf, Saipan | 2023-04-29 | 14 | Male | In Water | Direct |
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Guam in 2023Every state in 2023This day in weather historyWarnings in Guam, April 2023
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: 1090556.