What are the sources for WeatherOnline forecasts?


The WeatherOnline forecasts are created by using a MOS system developed in-house with the most current US weather services model data (GFS). The statistical methods of the Model-Output-Statistic (MOS)-System were developed in cooperation with the Meteorological Department of the University of Bonn.

What is a MOS-System?


A Model-Output-Statistic (MOS)-System combines the data of the weather forecast model and the locally recorded data for any given point by transforming the model data from a coarse grid to detailed small scale areas.
In order to do so, one needs a large volume of past model forecast data as well as the corresponding recorded data for any given location. The MOS-System relates these two sets of data in an optimized fashion allowing development of the local weather forecast by using the most current model forecast.

What are the time intervals used in the temperature and icons of the local forecasts?


The forecasted maximum temperature always refers to a 12hour window from 6am to 6om local time.
The forecasted minimum temperature always refers to the 12hour window from 6pm of the day before the forecast day to 6 am of the forecast day.
The weather icon for the morning refers to the time between 6am and 12pm local time, the icon for the afternoon is valid from 12am to 6pm local time and the evening icon refers to the time from 6pm to 12am local time.

How often are the current weather conditions and forecasts updated?


The current weather information as well as the satellite images are updated every 30 minutes whereas the radar images are being updated every 15 minutes.
The local weather forecasts as well as the weather charts are updated 8 times a day. The updates start at 2 am CEST or 3 am CEST depending on daylight saving time and continue on a three hourly bases.


Nearby Weather Stations - San Salvador Distance
San Salvador / Ilopango AP 0.0 km
Comalapa Airport 6.8 km
Melchor de Mencos Airport 6.9 km
Sinuapa 7.6 km
Esquipulas Airport 26.0 km
Santa Rosa de Copán Airport 37.2 km
Zacapa Airport 47.1 km
Zacapa Airport 47.1 km
Santa Ana Airport 50.1 km
Puerto Barrios 57.7 km
Acajutla/sonsonate 79.8 km
Flores 85.4 km
Philip S. W. Goldson Intl. Airport 91.4 km
La Esperanza 107.6 km
San Miguel/papalon 110.2 km
La Mesa 131.8 km
Cobán 133.6 km
La Union 137.5 km
Guatemala/La Aurora AP 155.8 km
Amapala 163.3 km
Soto Cano Airport 166.5 km
Tela 181.9 km
Puerto San José Airport 189.2 km
Tegucigalpa Airport 211.5 km
Choluteca 218.5 km
Chinandega Airport 220.8 km
Yoro Airport 222.7 km
Golosón Intl. Airport 250.6 km
Huehuetenango AP 261.6 km
Quetzaltenango Airport 266.1 km
Retalhuleu 283.9 km
Roatán 289.6 km
Managua/Augusto AP 328.4 km
Comitán 335.7 km
Tapachula Airport 348.8 km
Jinotega Airport 348.8 km
Trujillo 353.9 km
Catacamas 354.4 km
Rivas Airport 365.6 km
San Cristóbal de las Casas 391.4 km
Liberia 397.8 km
Villahermosa Airport 411.8 km
Juigalpa Airport 417.5 km
Villahermosa 424.7 km
Tuxtla Gutiérrez 445.2 km
Tuxtla Gutiérrez Airport 447.0 km
Arriaga 532.4 km