CMC discussion on late Monday system.

ERN/ATLC CAN... UPR GRTLKS SYS CONTS EWD TWD NRN NWENG BEFORE BEING ABSORBED BY MAJOR WINTER STROM DVLPG OVR WALTC ON DY5. 00Z GFS AND GBL ARE A LOT SHARPER WITH ASOCTD UPR TROF THAN THE 12Z UKMET AND ECMWF. THE 00Z RUN OF THE UKMET IS NOW IS AGREEMENT WITH GFS/GBL SENARIO AND IT ALSO DVLPS A HUGE STORM. FOR NOW IS LOOKS LIKE A 10-20CM EVENT WITH RISK OF FRZG PCPN OVR SRN MRTMS. HOWEVER FURTHER ADJUSTMENTS ARE SURE TO TAKE PLACE AS SYS IS RESULT OF MERGING IMPULSES WHICH IS ALWAYS TRICKY.