2010 is already the wettest year since reliable records bagan in El Salvador. Here's what the SNET said on september 28 (translated with miscrosoft translator and edited a little by me):
Matthew increases the rainfall to 30.7% above the historical averageTuesday 28 September 2010.
Since January 1 until September 27, 2353 mm (92.6 inches) of rain have been accumulated throughout the country. This is
30.7% above the annual average registered in previous years.. The accumulated rainfall this year exceeds
the normal value of annual rain that corresponds to 1800 mm (70.9 inches). The accumulated rainfall this year is already higher than the previous record of 2181 mm (85.9 inches) in 2005. According to the records of the national network of meteorological stations, the rains from Matthew in El Salvador exceeded 200 mm. The maximum amount was recorded in Santiago de María, Department of Usulután with an amount of 253.4 millimetres (mm), followed by the Los Andes station in Santa Ana, with 226 mm (mm). Other two places where water quantities exceeded the 100 millimetres of precipitation were Chiltiupán in La Libertad with 112.4 mm and 112.1 in Acajutla.
The influence of Tropical storm Matthew began in the country Friday 24th and lasted through Sunday 26 when it was downgraded to tropical depression in the Mexican territory. Furthermore, the Intertropical Convergence zone approached the Central American region producing moderate and occasionally very strong rains. Tropical storm Matthew is the 13th named cyclone in the Atlantic Ocean according to the National Hurricane Center. This same entity predicted a very active hurricane season for the Atlantic, foreseeing 18 cyclones named when the historical average is 10.
The original link in Spanish:
http://www.marn.gob.sv/index.php?option=com_content&view=article&id=481%25matthew-incrementa-al-307-de-lluvias-sobre-el-promedio-historico&catid=1%25noticias-ciudadano&Itemid=77