A complex storm system affected the mid-Atlantic on November 30, 2020. Developing low pressure over the Southeast US began to interact and phase with a clipper system over the Great Lakes, leading to a steadily intensifying low tracking northward along the Appalachians. This would become the primary low pressure system, which moved into Pennsylvania by the afternoon of the 30th. Ahead of the low, a warm front pushed through the mid-Atlantic and brought a period of rain with embedded thunder during the morning and early afternoon. By later in the day, a cold front began to approach. While increasing mid-level dry air was an inhibiting factor, the development of some sunshine after the earlier rain helped some modest instability to develop as surface temperatures rose well above seasonal normal. Combined with strong forcing and very strong wind fields in the narrow warm sector of the intensifying and highly dynamic low, convection developed ahead of the cold front. The combination of these factors led to a spatially limited but considerably impactful severe weather event over portions of eastern Pennsylvania, New Jersey, the Eastern Shore of Maryland, and northern Delaware. A number of instances of damaging wind as well as a couple of tornadoes occurred in the region. This event was also noteworthy in that despite being a late season event, some of the stronger convective elements were comparable in depth to typical mid-summer convection.

Tornado in CAROLINE, MARYLAND
From 30-NOV-20 15:13:00 to 30-NOV-20 15:20:00 (EST-5)
Location: BALTIMORE CORNER
Tornado F-scale: EF0
Reported by: NWS Storm Survey

A tornado touched down along Maryland State Route 313 at 3:13 PM
just south of the Caroline-Queen Anne���s County border. Damage was
sparse in this area, but a velocity couplet developed over this
location when viewed by the nearby NEXRAD KDOX in Dover Delaware.
There was also a small area of low correlation coefficient values
coinciding this velocity couplet, suggestive of a tornado debris
signature (TDS). This signature moved in a northeasterly direction
roughly three to four miles northwest of the small town of
Henderson, MD. Two areas of damage occurred along this linear path
created by the TDS, the first being to a residence along Trunk Line
Road just to the east of the intersection with Taylor Road. Here, a
small horse barn was completely destroyed, with its roof being blown
across a yard into a nearby house and several sides falling down.
This resulted in damage to the roof, siding, and chimney of the
home. Several trees and branches were also uprooted and broken in
the vicinity. No damage was reported for roughly 1.4 miles as the
tornado moved to the northeast, with the base perhaps lifting at
times. A second area of damage occurred at a chicken farm on Shults
Road between the intersections with Hecht and Zion Roads. Here, two
barns were destroyed with the roof being lifted and tossed off of
one and peeled back and twisted on the second. It is unclear if any
damage occurred to the chicken barns that were located behind these
two barns or to any of the poultry. From there, the TDS continued
northeastward for another 1.4 miles before disappearing right
before the Delaware Border just south of the small town of
Templeville, MD in Caroline County. It is at this point that we
estimate the tornado to have lifted based on trends in the
corresponding velocity couplet and TDS from radar. The NWS survey
team would like to thank the Marydel Volunteer Fire Company for
their assistance in this survey, which was conducted remotely and
is subject to change if additional information becomes available.