Heavy weather is moving across the Dominican Republic, and the country's Emergency Operations Center (COE) has raised a yellow alert for nine provinces plus the National District, with another 16 on green alert. The culprit is a trough combined with a very moist air mass, which forecasters at INDOMET say will drive heavy to torrential rain, thunderstorms, hail in places and sharp wind gusts.

The yellow alert list reads like a map of where travellers are likely to be: Greater Santo Domingo and the National District, the north-coast hubs of Puerto Plata, Espaillat and Santiago, and the southwestern provinces of Pedernales, Independencia, Bahoruco and Barahona. The green alert covers everywhere from Punta Cana's La Altagracia and La Romana in the east to La Vega, San Cristóbal, Azua and a dozen more.

The worst conditions are expected to hit first in the southwest, the Haitian border zone, the Caribbean coastline and the eastern plains, before spreading across the rest of the country. If you're in any of these areas, the advice from authorities is blunt: stay out of the water. That means no beach days or swimming in alert provinces, and absolutely no crossing rivers, streams or ravines where water levels have risen. Flash flooding is the real danger in this kind of setup, and swollen waterways can look calm one minute and be raging the next.

For anyone on the ground or with trips booked in the coming days, a few practical moves make sense. Keep an eye on COE and INDOMET updates, since alert levels can change quickly as the system develops. Build slack into any road travel — landslides and flooded roads can close routes, especially in mountainous and southwestern areas. Resort guests on the east coast should expect interrupted beach time and possibly downpours that come and go; hotel staff will usually have the latest on local conditions. If you have excursions booked — river trips, waterfall hikes, catamaran days — check with the operator before heading out, as these are typically the first things cancelled.

Why it matters: this is peak territory for Dominican holidays. Santo Domingo is the main entry point for city breaks, Puerto Plata anchors the north coast, and Punta Cana sits in La Altagracia, all touched by the alerts. Storms like this usually pass within days, but travellers already in-country should follow local guidance rather than gamble on a beach morning, and those flying in soon should watch for delays at Santiago and Santo Domingo airports.