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Practice Cancellations:

Practices can be cancelled either by the County (Loudoun County Parks and Recreation) or by your team's coach. 
For the latest field cancellations, contact the Loudoun Sports Line at (703) 777-0456.  The recorded message will specify whether your practice field has been closed.
Coaches typically work out an individual team policy regarding practice cancellations.

Game Cancellations:

NVYLL does not universally cancel games... it is dependent on the home team to decide whether their field(s) are playable.  Reference either the NVYLL Master Schedule or the NVYLL Team Schedule to see if your game has been cancelled.  If your game has been cancelled, there will be a Red Line through your game on the schedule.  Games on turf are LESS likely to be cancelled.  Check often on game day!