RICO’s Q — The national weather service, the Instituto Meteorológico Nacional (IMN) is pretty secure in predicting that the beginning of December will begin the transition to the dry season in the North Pacific, Central Pacific, and the Central Valley.
Although the rains will decrease significantly, some precipitation is expected, especially in the Pacific coastal areas. Or in the Central Valley, in particular in my home base of Santa Ana, in the middle of the night.
“A significant decrease in rainfall is expected as a result of lower moisture content and stronger trade winds,” said the IMN.
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Likewise, the mountainous Caribbean and Northern Zone will have an increase in rainfall in the first days of December.
According to the IMN, this is the timetable it is sure to bring in the dry season:
December 2 to 8
According to experts, for the Pacific, although in the dry season, more rain than normal is expected, particularly in the north. In the Guatuso Zone, there will also be more rain than normal. “This week, normal rains for the dry season period are expected throughout the Central Pacific and Central Valley,” reported the Meteorological Service.
It is expected to continue rainy both in the North Zone and in the South Pacific.
The North Caribbean and North Zone will have normal rains, the South Caribbean with less rain.
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December 9 to 15
This week there will be normal rains for the dry season period throughout the Pacific and Central Valley. Even the Caribbean coast and North Zone will have normal rains.
“For the Chiles and Guatuso region, it will be rainier than normal, with approximate amounts between 50 and 80 mm per week,” reported the IMN.
In addition, the weekly accumulations will be between 20-60 mm in the Caribbean and less than 50 mm in the Pacific.
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December 23-29
According to the forecast, it will continue to be normal, with less rain (within the normal scenario for the dry season) in:
- Pacific slope
- Central Valley
- Caribbean
- Northern Zone
“The increase in trade winds discourages the possibility of extreme events for the season for this period throughout the region,” reported the IMN.
Although there will be frontal systems, such as cold fronts, no significant impact is expected due to them during the month.
Cold front season
Regarding the season of cold fronts and thrusts, Karina Hernández, from IMN, highlighted that these systems will play an important role in the distribution of rain.
“Once the tropical cyclone season ends, we focus on what will happen with these fronts and cold thrusts,” she explained.
This is because these systems bring rain to the Northern Zone and the Caribbean slope from November to February.
However, this season is expected to be less active than normal. On average, the country receives around 24 cold thrusts that enter the Gulf of Mexico.
“This year, we anticipate only 22 of these, probably, only one will reach Costa Rica as a cold front. Normally, we are affected by two cold fronts, so we expect a reduction in their impact,” concluded Hernández.
According to experts, the peak of cold thrusts usually occurs at the end of January. However, one has already been presented this month and the other is expected this weekend.
The official weather forecast for today, Thursday, November 28, 2024:
On Thursday, the constant entry of humidity from the Caribbean Sea into the national territory will continue, which is favored by moderate winds. This will favor the incursion of cloudiness and, therefore, rain in sectors of the Caribbean and the Northern Zone, which may be isolated during the afternoon and the first hours of the night.
Part of the cloudiness may spread to sectors of the north and east of the Central Valley, with the occurrence of drizzle and light rain during the morning, and possible rain in the mountains during the evening period.
On the other hand, in the Central Pacific and the South Pacific, there will be isolated showers, with the possibility of storms, during the afternoon. In the North Pacific, gusts of wind of moderate intensity are expected to the north, without significant rain.
Get update weather forecasts and analysis here: https://www.imn.ac.cr/en/web/imn/inicio
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