A major snowstorm hitting the East Coast on Friday was adding uncertainty to the mortgage-backed securities (MBS) markets. With fewer participants than Treasuries and stocks, MBS prices are more susceptible to volatility when events decrease overall participation. If Treasuries hold their ground, MBS prices should remain near intermediate support levels set from prices on Thursday afternoon. Broader bond markets also face recent weakness, leaving Treasury yields little room to rise before facing challenges, making it difficult to find major motivation on Friday.