Use the firenzemeteo.it search engine to find what you are looking for
firenzemeteo.it is a big website and it is not always easy to find what you are looking for (webcams, weather maps, satellite images, etc ...). Try typing the text in the following box and press the enter key (or click on the blue icon) and find the results using the Google internal search engine.
Notes on GFS forecast maps
The Global Forecast System (GFS) is a National Centers for Environmental Prediction (NCEP)
weather forecast model that generates data for dozens of atmospheric and land-soil variables,
including temperatures, winds, precipitation, soil moisture, and atmospheric ozone concentration.
The system couples four separate models (atmosphere, ocean model, land/soil model, and sea ice) that work
together to accurately depict weather conditions.
GFS is a global model with a base horizontal resolution of 0.25° (28 kilometers) between grid points. The GFS is run 4 times a day, the temporal resolution covers analysis and forecasts out to 16 days.
GFS Italy: Relative Humidity [%] and Vertical Velocity [Pa/s] at 700 hPa
VERSIONE ITALIANA: CLICCA QUI
These maps show the relative humidity (in %) and the vertical baric velocities (in Pa/s) at a 700 hPa pressure level,
corresponding to an altitude of about 3000 m. The formation of medium clouds in an area
occurs with high relative humidity values and negative vertical (omega) velocities. Humidity close to 100% is not necessary if at the same time there
are sufficient ascending motions (negative vertical speeds) which, cooling by expansion, can bring the air to saturation. Here are 3 conditions for
which an overcast sky is expected: 1) RH=60÷80%, Ω <-0.4 Pa/s;
2) RH>80%, Ω<-0.3 Pa/s; 3) RH>90%, Ω=-0.3÷0 Pa/s.
On the top left is shown the UTC initialization time. UTC time is indicated with Z letter (Zulu Time). On the top right is shown the UTC forecast time.
The maps at 00Z, 06Z, 12Z and 18Z are updated respectively starting from 04.30 AM, 10:30 AM, 4:30 PM, 10.30 PM (CEST TIime).
Forecast model: Global Forecast System (GFS) with 0.25°x0.25° (lat x lon) spatial resolution.
NOTE: in central European countries, when solar time is in effect, the CET time is used, which is equal to UTC +1 hour, while when daylight saving time is in effect, the CEST time is used, which is equal to UTC +2 hours. Right now it is 8:50 UTC.