Heads up, residents and visitors of Saint-Martin and Saint-Barthélemy. The Guadeloupe Meteorological Center has issued a Yellow Alert for heavy rains and thunderstorms. This bulletin is a call for increased awareness and caution as unstable weather conditions are expected to impact the region.
Overview of the Yellow Alert
Météo France has placed Saint-Martin and Saint-Barthélemy under a Yellow Alert, which signifies a need to "Be Attentive." This is the first bulletin issued for this specific weather event, labeled as Episode n°17-IN.
The alert specifically warns of strong rains and thunderstorms. It was officially issued on Tuesday, October 7, 2025, at 11:35 AM local time. The weather event is expected to begin around 12:00 PM today and may last until Thursday, October 9, 2025, at 6:00 AM.
A Yellow Alert is a signal to be vigilant, especially if you are involved in outdoor activities that could be affected by the weather. It is not a call to halt all activity, but rather to be mindful of the developing situation and potential risks.
Current Weather Situation
The source of this instability is the tail end of Tropical Wave N°30. This system is generating an unstable southeasterly flow across the islands, bringing with it increased moisture and a higher potential for significant weather events. At the time the bulletin was issued, the primary conditions were set for the development of heavy showers and thunderstorms throughout the afternoon.
Forecast and Expected Impacts
The forecast points to a period of wet and unsettled weather. Here’s what you can expect:
Heavy Rainfall
The main concern is the potential for intense downpours. The meteorological center warns that rainfall accumulations could reach 30 to 50 mm (approximately 1.2 to 2 inches) in three hours or less. This rate of rainfall can quickly lead to localized flooding, particularly in low-lying or poorly drained areas.
Thunderstorms
Alongside the heavy rain, there is a risk of thunderstorms. These storms can bring not only downpours but also lightning and potentially gusty winds. The combination of these elements increases the danger associated with being outdoors.
Timeline of Events
- Tuesday Afternoon: The risk of moderate to strong, sometimes stormy, showers is highest.
- Tuesday Evening: A temporary improvement in conditions is expected.
- Tuesday Night: New showers are likely to develop overnight.
- Wednesday: The risk of showers will continue throughout the day.
The persistence of this weather pattern means that even during breaks in the rain, the ground will be saturated, increasing the risk of flash flooding if another heavy shower moves through.
Safety Recommendations from the Prefecture
When a Yellow Alert is in effect, it's vital to follow official safety advice. The prefecture has provided a list of recommended behaviors to minimize risk during this period of heavy rain and thunderstorms.
VIGILANCE JAUNE - FORTES PLUIES/ORAGES: SOYEZ ATTENTIFS! (Yellow Alert - Heavy Rains/Thunderstorms: Be Attentive!)
Here are the key precautions you should take:
- Stay Informed: Keep up-to-date with the latest weather forecasts. Monitor information from Météo France and local authorities.
- Be Cautious with Outdoor Activities:
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- If you plan on practicing any high-risk outdoor sports, reconsider your plans.
- Pay close attention if your outdoor activities are in an exposed area, whether on land or at sea.
- Avoid Flood-Prone Areas:
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- Be extremely careful if you need to travel through areas known to flood.
- This includes crossing fords (gués), ravines, or low-lying passages at the bottom of hills (mornes). These areas can become impassable very quickly.
- Take Precautions During a Thunderstorm:
- Avoid using landline telephones and electrical appliances.
- Do not take shelter near pylons, posts, or under a solitary tree, as these can attract lightning.
Stay Safe and Informed
This Yellow Alert is a reminder that weather conditions can change rapidly. The primary message is one of heightened awareness. By staying informed through official channels and making sensible decisions, you can significantly reduce your risk of being affected by the heavy rain and thunderstorms.
Remember to check on neighbors, especially the elderly or those who may need assistance. Secure loose objects around your property that could be affected by wind or heavy rain. Most importantly, do not take unnecessary risks. A cautious approach is the best way to ensure your safety and the safety of those around you until this weather system passes.