A quickie on the abbreviations...
WZ- Wetterzentrale ( German website for viewing charts)
NAO- North atlantic oscillation
PNA- Pacific North american
SOI./ENSO- El-Nino Southern oscillation
WAA- Warm air advection
CAA- Cold air advection
528 DAM- is the line drawn on the maps that equated to the temperature ( MAX) that snow can be often observed at
GFS- Global forecasting sytem
METO- Met office model
UKMO- United kingdom Met office
ECM( Or ECMWF) European centre of medium range weather forecasts..
ASL- Above sea level-
Ensembles- 10 GFS model runs- Control run is the one seen on the models
SST'S sea surface temperatures
PM- Polar maritime air
MT- Maritime Tropical air
PC- Polar Continental air
LRF's - Long range forecasts
MRF's- meduim range forecasts
Trough- Upper level equivalent to a surface Low pressure
Ridge- Upper level equivalent to a surface High pressure
Blocking- The jet stream being moved AROUND CLOCKWISE a large area of high pressure.