Multiple rounds of rain moved through the area as low pressure tracked to the west. This resulted in a few instances of flooding across northeastern Maryland.
Every event with a place to put it. Tap one for its entry below.
Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS LWX wrote it up.
Multiple rounds of rain moved through the area as low pressure tracked to the west. This resulted in a few instances of flooding across northeastern Maryland.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Baltimore/Washington wrote its last area forecast discussion before the first event at Nov 30, 10:24 AM EST, 2 hours 34 minutes earlier.
Area Forecast Discussion...UPDATED
National Weather Service Baltimore MD/Washington DC
1024 AM EST Mon Nov 30 2020
.SYNOPSIS...
Strong low pressure will move across the area this afternoon and
off to the northeast this evening. High pressure will gradually
build over the area by Thursday morning. Another storm system
may impact the area at the end of the week or early next week.
&&
.NEAR TERM /UNTIL 6 PM THIS EVENING/...
Steady rainfall has ended but a new round of showers with some
embedded thunder per GLM is working its way northeastward in
association with a low pressure lifting NNE. Given strong wind
profiles and limited instability, a risk of severe wx exists
mainly in the 17Z-20Z time frame. Short lines capable of
producing damaging wind guss and perhaps an isolated brief
tornado are possible mainly east of Rt 15. Svr threat should
end by 21Z.
&&
.SHORT TERM /6 PM THIS EVENING THROUGH WEDNESDAY NIGHT/...
By early this evening, the upper low which materalizes from the
mentioned phasing process will track from the Ohio Valley into
the Central Appalachians. Substantial cooling of the column is
expected to take shape with 700-mb temperatures dropping around
10 to 15 degrees over a 24 hour period. Precipitation over
along and west of the Allegheny Front will switch over to snow
by later this evening. Forecast soundings show moisture should
be shallow at the onset which would mitigate initial
accumulation potential. Heading into the overnight hours, a
steady period of westerly upslope takes shape across far western
Maryland and east-central West Virginia. The heaviest snow is
likely to fall from early Tuesday morning into the evening.
Consequently, a Winter Storm Warning is in effect for Garrett
County with Winter Weather Advisories out for western portions
of Grant and Pendleton Counties. Expect 4 to 6 inches of snow
with isolated amounts approaching 8 inches over higher
elevations of western Garrett County. Some lingering snow
showers are possible into Tuesday night as the upper low lifts
into New England. Wednesday should provide tranquil weather
across the region as a shortwave ridge moves through.
After a warm start to the work week, a pronounced cool down will
arrive in earnest. Tuesday's temperatures may be around 20
degrees lower than the previous day as highs struggle to escape
the 40s. Higher elevations are to stay in the upper 20s to low
30s. Blustery conditions will lower wind chills into the low/mid
30s across the DC and Baltimore metro areas. By mid- week,
temperatures may creep back up to low 50s in a few spots.
Departures from climatology will run around 4 to 8 degrees, a
bit higher in the mountains.
&&
.LONG TERM /THURSDAY THROUGH SUNDAY/...
A very blocky pattern is forecast by pretty much all medium range
guidance later this week, with two highly anomalous ridges centered
over southwestern to central Canada and over the North Atlantic
Ocean up Davis Strait between Canada and Greenland. In between, two
cutoff lows are forecast to be centered over Newfoundland Canada and
near the middle Mississippi River Valley. This pattern has a
-NAO/+PNA appearance to it, but with a lack of higher height
anomalies/lack of stronger ridging over the North Pole itself, the
result will probably be near to slightly below (as opposed to well
below) normal temperatures locally.
With this type of amplified pattern also comes the potential for
phasing of the two branches of the jet stream and increased
storminess. Not unexpectedly, medium range guidance develops another
area of low pressure at the surface ahead of the aforementioned
cutoff low as it approaches the Tennessee River Valley. Also not
unexpectedly is the uncertainty in the details regarding the track,
strength and sensible weather impacts to our region.
Precipitation chances will likely peak on Friday based on the latest
guidance and overall pattern. Given the current expectation that
temperatures will be near to perhaps slightly below normal, any
precipitation should fall in the form of mainly rain east of the
higher terrain, though another period of upslope snow would be
possible along and west of the Allegheny Front in this scenario.
High pressure and brisk conditions will likely return to the area
for the weekend before another storm system possibly approaches
early next week.
&&
.AVIATION /15Z MONDAY THROUGH FRIDAY/...
Showers will continue and conditions will likely remain MVFR or
lower through at least midday.
Conditions start to improve mid to late this afternoon, but
isolated thunderstorms will become a risk, with strong wind
gusts possible near convection, even though it may not contain
lightning. Have not included thunder in the TAFs yet since there
is not a consolidated/confident risk.
VFR likely by tonight through Tuesday night with mainly dry
conditions but west-northwesterly winds will gust up to 25
knots at times. Continued VFR conditions expected on Wednesday
with westerly wind gusts around 15 to 20 knots.
Mainly VFR Thu-Fri AM w/ light SW-S wind. Sub-VFR possible by
late Fri PM due to increasing chc for RA as wind turns SE.
&&
.MARINE...
Southeasterly winds will increase through mid morning. Despite
weak mixing, a very strong gradient should overcome that,
resulting in gusts around 35 to 40 knots. Consequently, Gale
Warnings are in effect across all waters through 6 PM this
evening.
Showers and isolated thunderstorms with strong winds may
develop this afternoon as well, with a lower risk during the
late morning. A waterspout can't be ruled out. Gales relax
behind cold front this evening, but SCA gusts likely continue
through Tuesday night, peaking during the daylight hours (and
potentially dropping sub-SCA during the overnight on the
sheltered waters). Marginal SCA conditions materialize on
Wednesday given a steady period of cool westerly winds on top of
the still mild waters.
A light southwesterly wind is forecast Thursday as high pressure
passes to the south, becoming southerly Thursday night into Friday
as the high moves offshore. The wind may begin to increase as it
turns southeasterly ahead of a low pressure system approaching from
the Tennessee River Valley by late Friday.
&&
.TIDES/COASTAL FLOODING...
Large spread is seen among various surge models with the P-ETSS
the most pessimistic and also looking less likely to verify
basen on latest observations from tide gauges. The forecast is
based on a blend of ETSS and ESTOFS and have issued a CF.Y for
Annapolis, Baltimore, and Washington DC.
The wind is forecast to become westerly by this evening. This should
cause water levels to recede rather steadily through the middle of
the week, precluding any further flooding concerns.
&&
.LWX WATCHES/WARNINGS/ADVISORIES...
DC...Coastal Flood Advisory from 5 PM this afternoon to 10 PM EST
this evening for DCZ001.
MD...Coastal Flood Advisory from 3 PM this afternoon to 9 PM EST
this evening for MDZ014.
Winter Storm Warning from 1 AM Tuesday to 7 AM EST Wednesday
for MDZ001.
Coastal Flood Advisory from 4 PM this afternoon to 10 PM EST
this evening for MDZ011.
VA...None.
WV...Winter Weather Advisory from 4 AM to 7 PM EST Tuesday for
WVZ501-505.
MARINE...Small Craft Advisory from 6 PM to 10 PM EST this evening for
ANZ530>532-535-536-538>542.
Gale Warning until 6 PM EST this evening for ANZ530>543.
Small Craft Advisory from 6 PM this evening to 6 AM EST
Tuesday for ANZ533-534-537-543.
&&
SYNOPSIS...BRO
NEAR TERM...LFR
SHORT TERM...BRO
LONG TERM...BRO/DHOF
AVIATION...LFR/DHOF
MARINE...LFR/DHOF
TIDES/COASTAL FLOODING...LFR<!doctype html>
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</html>PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
905 AM EST MON NOV 30 2020
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0840 AM FLOOD 2 WNW RAVENSWORTH 38.81N 77.25W
11/30/2020 FAIRFAX VA BROADCAST MEDIA
BURKE LAKE ROAD NEAR BRADDOCK ROAD CLOSED DUE TO
FLOODING.
&&
EVENT NUMBER LWX2002742
JMGPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
1135 AM EST MON NOV 30 2020
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0930 AM FLOOD 2 NE GLENDOWER 37.85N 78.52W
11/30/2020 ALBEMARLE VA 911 CALL CENTER
700 BLOCK OF COLES ROLLING ROAD CLOSED DUE TO FLOODING.
&&
EVENT NUMBER LWX2002743
JMGPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
1142 AM EST MON NOV 30 2020
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
1100 AM FLOOD 4 NNE EARLYSVILLE 38.20N 78.45W
11/30/2020 ALBEMARLE VA COUNTY OFFICIAL
FLOODING ON THE 1400 BLOCK OF DURRET RIDGE ROAD.
&&
EVENT NUMBER LWX2002744
JMGPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
1230 PM EST MON NOV 30 2020
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
1220 PM FLOOD 2 WNW ANNANDALE 38.85N 77.24W
11/30/2020 FAIRFAX VA MESONET
WBAV2 STREAM GAUGE REACHED MINOR FLOOD STAGE OF 251.50.
&&
EVENT NUMBER LWX2002745
JMGThe national radar mosaic for the moment the first event began.
6 flood. Local standard time, as filed.
Whitemarsh Run at White Marsh was in Minor Flood stage during the indicated time period, reaching a peak level of 11.39 feet at 1:15 PM on the 30th. Water covered parking lots near Town Center Court.
Otter Point Creek at Edgewood was in Minor Flood stage during the indicated time period, reaching a peak level of 9.38 feet at 3:30 PM on the 30th. Winters Run Road was flooded near Singer Road.
MD-7 (Philadelphia Road) closed due to flooding near Calvary Road.
MD-7 was closed due to flooding near Campbell Boulevard.
Whitemarsh Run at White Marsh was in Minor Flood stage during the indicated time period, reaching a peak level of 11.46 feet at 3:20 PM on the 30th. Water covered parking lots near Town Center Court.
Love Road was closed due to flooding between Franklin Church Road and Smith Road. Glen Cove Road was closed due to flooding between Love Road and Castleton Road.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Maryland in 2020Every state in 2020This day in weather historyWarnings in Maryland, November 2020
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-10-01. Each event’s entry at NCEI: 926404, 926384, 926360, 926361, 926405, 926362.