Tropical Wave No. 40 To Trigger Sunday Afternoon Rain In Costa Rica

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SAN JOSÉ, Costa Rica - The passage of Tropical Wave No. 40 across Costa Rica is expected to significantly increase atmospheric moisture and instability this Sunday afternoon, bringing widespread rain and thunderstorm, according to the National Meteorological Institute (IMN).

Afternoon Forecast: Thunderstorms and Regional Impacts

Early morning weather patterns recorded maritime rain on both coasts. While mainland conditions began partially cloudy in the Caribbean and sunny in the Pacific, afternoon hours will see scattered showers in the Caribbean and heavy downpours with thunderstorms in the South Pacific.

Lighter precipitation is forecast for the Central Pacific, North Pacific (central and western areas), and sectors of the Central Valley. Wind gusts are also expected in the northern Pacific coast.

Dry September: El Niño Suppresses Seasonal Rainfall

Despite Sunday's rains, IMN confirms that a rainfall deficit will persist through late September and early October across the Pacific, Central Valley, and Western Northern Zone due to El Niño and stronger-than-normal trade winds.

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