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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 - Grass Valley Απόσταση
Nevada 0.5 km
Auburn Airport 17.8 km
Blue Canyon 31.8 km
Placerville Airport 39.3 km
Lincoln Airport 42.9 km
Beale Air Force Base 48.5 km
Sacramento Mather Airport 50.9 km
Sacramento McClellan Airport 54.7 km
Yuba 63.4 km
Sacramento Executive Airport 68.7 km
Oroville Municipal Airport 71.0 km
Sacramento International Airport 72.3 km
Stockton Metropolitan Airport 80.7 km
Modesto 90.9 km
Columbia Airport 93.8 km
Davis Airport 96.1 km
Truckee Tahoe Airport 96.6 km
Chico Municipal Airport 100.2 km
Lake Tahoe Airport 113.2 km
Castle Airport 115.1 km
Nut Tree Airport 116.7 km
Travis Air Force Base 117.7 km
Merced Regional Airport 122.5 km
Livermore Municipal Airport 126.5 km
Reno Stead Airport 127.6 km
Reno 136.4 km
Buchanan Field Airport 137.2 km
Alturas Airport 140.0 km
South County Arpt Of Santa Clara County 140.2 km
Κάρσον Σίτι Αεροδρόμιο 141.1 km
Hollister Airport 141.6 km
Reid- Hillview Airport 142.1 km
San Jose International Airport 149.1 km
Red Bluff Municipal Airport 149.4 km
Hayward Executive Airport 153.6 km
Napa Airport 154.1 km
Moffett Federal Airfield 157.0 km
Watsonville Municipal Airport 158.5 km
Oakland International Airport 160.7 km
Πάλο Άλτο Αεροδρόμιο 160.8 km
Madera Municipal Airport 160.9 km
Salinas Municipal Airport 161.9 km
Redding Municipal Airport 163.0 km
San Carlos Airport 170.9 km
Monterey Regional Airport 179.7 km
San Francisco International Airport 180.2 km
Lake County Airport 180.5 km
Marin 184.3 km
Petaluma Airport 187.3 km
Crater Lake 187.7 km
Mount Shasta 191.1 km
Eddie Andreini Sr. Airfield 194.5 km
Fresno Yosemite International Airport 198.5 km
Naval Air Station Lemoore 200.4 km
Santa Rose Airport 206.4 km
Paso Robles Municipal Airport 206.5 km
Trinity Center 215.2 km
Siskiyou 221.9 km
Hanford Municipal Airport 224.1 km
San Luis Obispo County Regional Airport 230.4 km
Weaverville 232.2 km
Visalia Municipal Airport 241.0 km
Ukiah Airport 245.1 km
Naval Air Station Fallon Airport 256.2 km
Mammoth Yosemite Airport 256.3 km
Hawthorne Industrial Airport 266.0 km
Derby Field 274.9 km
Medford Airport 278.5 km
Porterville Airport 279.3 km
Meadows Field Airport 302.5 km
Eastern Sierra Regional Airport 310.3 km
Burns Municipal Airport 333.1 km
Roseburg Regional Airport 353.6 km
Rohnerville Airport 357.8 km
Tehachapi Municipal Airport 363.2 km
Arcata 365.0 km
Winnemucca Airport 367.9 km
Mojave Air and Space Port Airport 390.7 km
Crescent City 391.4 km
Rome State Airport 394.3 km
Brookings Airport 404.4 km
Naval Air Weapons Station China Lake 416.3 km
Tonopah Airport 440.5 km
Southwest Oregon Regional Airport 440.8 km
Bicycle Lake Army Airfield 530.1 km
Caldwell Airport 540.4 km
Nampa Municipal Airport 550.2 km
Mercury/Desert Rock 571.6 km
Μπόισι Αεροδρόμιο 580.5 km