UPDATE: Lancaster, York, and Adams Counties are now under a Severe Thunderstorm Warning. Winds up to 60 MPH and large hail are possible.
The National Weather Service has issued a Severe Thunderstorm Watch until 5pm for the following counties:
Strong, gusty winds and hail are possible, with at least a slight risk of tornadic activity.
CBS-21 Meteorologists Steve Knight and Chris Naillan discuss what to expect, and Naillan explains the similarities between today's weather patterns and the patterns from Saturday that saw tornadic activity in Lancaster and York Counties: