Model:

GFS (Global Forecast System) Küresel Hava Tahmin Sistemi Modelleri, " Milli Meteoroloji Merkezlerinden" (NCEP) alınan veriler doğrultusunda oluşturulur(NCEP)

Güncelleme: Günde 4 defa güncellenmek üzere, 05:30, 11:30, 17:30 ve 23:30 saatlerinde oluşturulurlar
Grinwich Saat Farkı: 12:00 GMT = 14:00 EET
Parametre: Mean relative humidity between 0 and about 300 m above the ground level
Tarife: This chart shows the mean relative humidity for the atmospheric layer between 0 and 300m. Although this map is less important than RH-charts (like 925 hPa or 700 hPa) it still gives some useful hints on very shallow humidity inversions and thus temperature inversions.