Download speeds <1Mbps but upload ok at 4 Mbps

For the past week I've been having horrible download speeds which seem to have started when there was an outage nearby due to a storm. I'm in the Fairfax/Northern VA area. Reseting the modem has not helped and neither has going directly from the modem to the PC. Consistant download speeds the past week in the range of 850 kbps Please assist.