Current Weather

Weather Satellite

NASA EOSDIS excellent quick browser for current and archive imagery

UKMO Synoptic Charts

Actual and forecast charts

Archive UKMO midnight charts useful for comparing with past satellite imagery

NWP

Earth wind map useful for browsing NWP data at different levels around the globe.

Snow and Ice

(US) National Snow and Ice Data Centre

General Pages

METEOCEN Reading well chosen links.

Weather Charts everything should be here somewhere.