1) Heavy snowstorrm 
Blanketing is interference caused by strong radio signals. Although the spectral mask of a radio station`s transmitter suppresses spurious emissions on other frequencies in the band, being extremely close to a station may allow them to still be strong enough to cause significant interference. The strong station will appear on nearly every blank o....
• (n.) The act or punishment of tossing in a blanket. • (n.) Cloth for blankets. • (p. pr. & vb. n.) of Blanket
blocking the wind from getting to another boats sail. The leeward boat is said to have been blanketed
Blan'ket·ing noun 1. Cloth for blankets. 2. The act or punishment of tossing in a blanket. « That affair of the blanketing happened to thee for the fault thou wast guilty of. Smollett. » 
blankets: The blanketing was too warm. · the effect of a signal from a powerful transmitter that interferes with or prevents the reception of other signals.