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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.


Nächste Wetterstation - Portola Valley Abstand
San Carlos Airport 10.5 km
Palo Alto Flughafen 11.0 km
Moffett Federal Airfield 17.0 km
Hayward Executive Airport 20.1 km
Metropolitan Oakland Flughafen 21.8 km
San Francisco Intl. Airport 25.2 km
San José Flughafen 30.7 km
Half Moon Bay Airport 34.5 km
Buchanan Field Airport 40.1 km
Reid- Hillview Airport 42.7 km
Livermore Municipal Airport 47.0 km
Napa Flughafen 51.1 km
Watsonville Flughafen 53.0 km
Monterey Regional Airport 60.5 km
Travis Air Force Base 60.9 km
Marin 61.0 km
Nut Tree Airport 65.3 km
South County Arpt Of Santa Clara County 69.2 km
Petaluma Flughafen 69.7 km
Salinas Municipal Airport 78.5 km
Davis Flughafen 82.7 km
Hollister Flughafen 92.2 km
Santa Rose Airport 97.2 km
Sacramento Executive Airport 103.2 km
Sacramento Flughafen 103.5 km
Stockton Metropolitan Airport 110.3 km
Sacramento McClellan Airport 117.2 km
Sacramento Mather Flughafen 121.8 km
Yuba 123.9 km
Lincoln Flughafen 130.8 km
Beale Air Force Base 134.3 km
Modesto 140.0 km
Oroville Municipal Airport 140.4 km
Chico Municipal Airport 147.9 km
Ukiah Flughafen 153.6 km
Auburn Flughafen 154.8 km
Red Bluff Municipal Airport 165.3 km
Nevada 171.7 km
Placerville Airport 179.3 km
Castle Air Force Base 181.7 km
Redding Municipal Airport 186.4 km
Merced Regional Airport 187.4 km
Blue Canyon 199.1 km
Paso Robles Municipal Airport 200.4 km
Columbia Flughafen 202.4 km
San Luis Obispo County Regional Airport 213.0 km
Weaverville 217.8 km
Trinity Center 222.9 km
Madera Municipal Airport 233.1 km
Mount Shasta 234.9 km
Vandenberg Space Force Base 236.6 km
Santa Maria Public Airport 241.5 km
Lompoc Flughafen 248.2 km
Truckee Tahoe Airport 256.0 km
Naval Air Station Lemoore 257.4 km
Lake Tahoe Airport 260.6 km
Siskiyou 264.5 km
Fresno Yosemite Intl. Airport 278.6 km
Santa Ynez Flughafen 284.8 km
Rohnerville Airport 289.7 km
Reno Stead Airport 290.4 km
Hanford Municipal Airport 293.8 km
Carson City Flughafen 293.9 km
Reno-Tahoe Flughafen 295.5 km
Arcata-Eureka Airport 302.7 km
Alturas Flughafen 302.9 km
Santa Barbara Municipal Airport 312.5 km
Visalia Municipal Airport 317.4 km
Crescent City 351.7 km
Porterville Flughafen 357.4 km
Meadows Field Airport 367.4 km
Mammoth Yosemite Airport 374.4 km
Oxnard Airport 379.3 km
Naval Outlying Landing Field San Nicolas 386.2 km
Camarillo Flughafen 389.5 km
Naval Air Station Point Mugu 389.6 km
Hawthorne Industrial Airport 402.4 km
Naval Air Station Fallon Airport 406.3 km
Sandberg Airport 413.1 km
Eastern Sierra Regional Airport 426.7 km
Derby Field 432.0 km
Tehachapi Municipal Airport 437.0 km
Van Nuys Flughafen 449.9 km
Whiteman Airport 455.6 km
Santa Monica Municipal Airport 457.8 km
Burbank 463.8 km
Los Angeles Intl. Airport 466.0 km
General William J. Fox Airfield 466.8 km
Mojave Air & Space Port Flughafen 468.8 km
San Clemente Island Flughafen 470.4 km
Hawthorne Municipal Airport 471.5 km
Zamperini Field 474.9 km
Catalina Airport 477.9 km
Downtown Los Angeles 478.9 km
Long Beach Airport 492.5 km
San Gabriel Valley Airport 498.6 km
Joint Forces Training Base 503.0 km

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