Lines of severe thunderstorms produced scattered to numerous instances of wind damage across eastern West Virginia, northern Maryland, and northern Virginia.
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.
Lines of severe thunderstorms produced scattered to numerous instances of wind damage across eastern West Virginia, northern Maryland, and northern Virginia.
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 Jun 21, 8:32 AM EST, 4 hours 45 minutes earlier.
Area Forecast Discussion
National Weather Service Baltimore MD/Washington DC
932 AM EDT Mon Jun 21 2021
.SYNOPSIS...
Claudette will pass southeast of the area today and a strong
cold front will pass through the area late tonight into Tuesday.
High pressure will build overhead for Wednesday and Thursday
before moving offshore late in the week.
&&
.NEAR TERM /THROUGH TONIGHT/...
High pressure will remain over the Atlantic while a strong cold
front moves southeast through the Ohio Valley today. Claudette
will pass by to our southeast during this time as well.
Winds currently beginning to shift to the south/southwest as
skies continue to clear the region thanks to subsidence to the
north of Claudette. It will be quite hot and humid today as
heat indices will range from the mid to upper 90s for most
valleys west of the Blue Ridge to the lower 100s east of the
Blue Ridge. It is not out of the question that a Heat Advisory
could be needed, but confidence remains too low at this time
since dewpoints may mix down just a bit. However, leaning
against any heat headlines at this time as the NBM 90th
percentile indicate dewpoints in the low 70s.
Chances for showers and thunderstorms will increase, especially
later this afternoon into this evening ahead of the cold front
that will be approaching from the Ohio Valley and also along a
surface trough that is expected to develop over northern
VA/northern MD into the metro areas. Falling heights,
strengthening shear profiles, and relatvely high CAPE values
suggests that some storms may become severe. Locally damaging
wind gusts will be the primary threat, but large hail cannot be
ruled out due to the high amounts of instability progged to be
in the -10-20C range.
Convection should wane late this evening and overnight for most
areas, but showers are still likely overnight especially near
the Allegheny Highlands as an upper-level trough approaches from
the west.
&&
.SHORT TERM /TUESDAY THROUGH WEDNESDAY NIGHT/...
...PREVIOUS DISCUSSION...
The cold front will slowly build to our south Tuesday while the
upper-level trough swings through the area. There will be a
period of showers associated with the upper-level trough,
especially Tuesday morning through mid-afternoon. Drier air
associated with subsidence behind the trough axis will cause
precipitation to end from west to east during the afternoon
hours. An isolated t-storm cannot be ruled out, but instability
will be limited for most areas due to cooler temperatures and
plenty of clouds. The best chance for a stronger storm will be
across extreme southern MD.
High pressure will build overhead for Tuesday night, bringing
dry and noticeably cooler and less humid conditions. High
pressure will bring plenty of sunshine and low humidity for
Wednesday, and Wednesday night will turn out dry and cool.
&&
.LONG TERM /THURSDAY THROUGH SUNDAY/...
Some models are hinting at the possibility of a coastal low
forming off of Cape Hatteras late Wednesday and into early
Thursday before shifting northward. Depending on the track and
intensity, expect increased cloud coverage and precipitation
chances the further south and east in our CWA you go. Impacts
look to be minimal in nature for this event with high pressure
exiting off the eastern seaboard. For now, will keep low end
PoPs for the period.
For Friday, southerly winds will bring a warming trend into the
weekend with only the usual summertime diurnal heating induced
thunderstorm chances. Otherwise, remaining mostly dry with some
scattered cloud coverage. Saturday, shortwave energy tied to an
upper level disturbance near the Great Lakes will pose the
threat for some showers and potential thunderstorms across the
area. GEFS showing the potential for around 1000 j/kg MUCAPE
with fairly weak bulk shear so for now severe potential looks to
be fairly low but non zero at this time. Timing with these
disturbances have been in disagreement with the ensembles so
will have to wait to see a more confident solution in timing and
potential intensity for these systems. For Sunday and the start
of the workweek, expect a slight cool down with increased
shower potential throughout the day with thunderstorms possible
in the afternoon.
&&
.AVIATION /13Z MONDAY THROUGH FRIDAY/...
Low celings have mostly cleared the terminals this morning. Any
residual low clouds are expected to clear within the next hour.
VFR conditions under a S/SW flow will ensue for the remainder of
the day into the afternoon hours.
Scattered thunderstorms are expected this afternoon and evening
as a cold front approaches from the west. Some storms may
produce damaging wind gusts and perhaps even large hail. The
best chance for a stronger storm will be late this afternoon and
evening (around 20z-02z).
Convection should wane overnight, but showers are expected
to continue throughout much of Tuesday. As a result,
restrictions are likely. An isolated t-storm cannot be ruled
out either, but the stronger storms should remain across our
south, mainly away from the terminals with the exception of CHO.
High pressure will bring VFR conditions Tuesday night through
Wednesday night.
VFR conditions expected most of the day on Thursday with isolated
instances of sub-VFR, mainly for the SE terminals with any passing
shower or storm that crosses the terminals. Friday, expect VFR
conditions with isolated sub-VFR with any afternoon
showers/thunderstorms.
&&
.MARINE...
A southerly flow is expected today and winds will increase some
as the gradient increases this afternoon. An SCA is in effect
for our extreme southern waters this morning, and for most of
the Bay and lower Tidal Potomac River this afternoon and
evening.
Scattered storms are expected late this afternoon and evening.
Some storms may produce gusty winds and hail.
A cold front will pass through late tonight into Tuesday.
Northwest winds behind the cold front may gust around SCA
criteria Tuesday into Tuesday night. High pressure will build
over the waters Wednesday and Wednesday night.
An isolated SMW possible for the water Thursday as a coastal low
pressure tracks further north near the bay. Otherwise, sub-SCA winds
expected outside of these isolated cells Thursday and Friday.
&&
.LWX WATCHES/WARNINGS/ADVISORIES...
DC...None.
MD...None.
VA...None.
WV...None.
MARINE...Small Craft Advisory until 10 PM EDT this evening for
ANZ530>533-539>541.
Small Craft Advisory until midnight EDT tonight for ANZ534-537-
543.
&&
SYNOPSIS...BJL/MSS
NEAR TERM...BJL/MSS
SHORT TERM...BJL
LONG TERM...ADM
AVIATION...BJL/ADM/MSS
MARINE...BJL/ADMHazardous Weather Outlook National Weather Service Baltimore MD/Washington DC 1148 AM EDT Mon Jun 21 2021 ANZ530>543-DCZ001-MDZ008-011-013-014-016>018-504-506-508- VAZ052>057-221600- Chesapeake Bay north of Pooles Island MD- Chesapeake Bay from Pooles Island to Sandy Point MD- Chesapeake Bay from Sandy Point to North Beach MD- Chesapeake Bay from North Beach to Drum Point MD- Chesapeake Bay from Drum Point MD to Smith Point VA- Tidal Potomac from Key Bridge to Indian Head MD- Tidal Potomac from Indian Head to Cobb Island MD- Tidal Potomac from Cobb Island MD to Smith Point VA- Patapsco River including Baltimore Harbor- Chester River to Queenstown MD-Eastern Bay- Choptank River to Cambridge MD and the Little Choptank River- Patuxent River to Broomes Island MD- Tangier Sound and the inland waters surrounding Bloodsworth Island-District of Columbia-Cecil-Southern Baltimore- Prince Georges-Anne Arundel-Charles-St. Marys-Calvert- Central and Southeast Montgomery-Central and Southeast Howard- Southeast Harford-Prince William/Manassas/Manassas Park-Fairfax- Arlington/Falls Church/Alexandria-Stafford-Spotsylvania- King George- 1148 AM EDT Mon Jun 21 2021 This Hazardous Weather Outlook is for the Maryland portion of the Chesapeake Bay, Tidal Potomac River, and I-95 corridor through central Maryland, northern Virginia, and District of Columbia. .DAY ONE...This Afternoon and Tonight Scattered severe storms with damaging wind gusts or large hail are possible this afternoon and evening. Isolated instances of flooding are possible as well. .DAYS TWO THROUGH SEVEN...Tuesday through Sunday Isolated instances of flooding are possible Tuesday across the outlook area. A severe storm is possible across southern Maryland Tuesday. .SPOTTER INFORMATION STATEMENT... Spotter activation may be needed this afternoon and evening. MDZ003>006-503-505-507-VAZ025>031-036>040-050-051-501-502-505>508- WVZ050>053-055-221600- Washington-Frederick MD-Carroll-Northern Baltimore- Northwest Montgomery-Northwest Howard-Northwest Harford-Augusta- Rockingham-Shenandoah-Frederick VA-Page-Warren-Clarke-Nelson- Albemarle-Greene-Madison-Rappahannock-Orange-Culpeper- Northern Fauquier-Southern Fauquier-Western Loudoun- Eastern Loudoun-Northern Virginia Blue Ridge- Central Virginia Blue Ridge-Hampshire-Morgan-Berkeley-Jefferson- Hardy- 1148 AM EDT Mon Jun 21 2021 This Hazardous Weather Outlook is for portions of eastern West Virginia, northern and central Virginia, and central and western Maryland. .DAY ONE...This Afternoon and Tonight Scattered severe storms with damaging wind gusts or large hail are possible this afternoon and evening. Isolated instances of flooding are possible as well. .DAYS TWO THROUGH SEVEN...Tuesday through Sunday Isolated instances of flooding are possible Tuesday. .SPOTTER INFORMATION STATEMENT... Spotter activation may be needed this afternoon and evening. MDZ001-501-502-VAZ503-504-WVZ501>506-221600- Garrett-Extreme Western Allegany-Central and Eastern Allegany- Western Highland-Eastern Highland-Western Grant-Eastern Grant- Western Mineral-Eastern Mineral-Western Pendleton- Eastern Pendleton- 1148 AM EDT Mon Jun 21 2021 This Hazardous Weather Outlook is for the Allegheny Front counties in western Maryland, eastern West Virginia, and Highland County Virginia. .DAY ONE...This Afternoon and Tonight Scattered severe storms with damaging wind gusts or large hail are possible this afternoon and evening. Isolated instances of flooding are possible as well. .DAYS TWO THROUGH SEVEN...Tuesday through Sunday No hazardous weather is expected at this time. .SPOTTER INFORMATION STATEMENT... Spotter activation may be needed this afternoon and evening.
Special Weather Statement National Weather Service Baltimore MD/Washington DC 108 PM EDT Mon Jun 21 2021 ANZ530>534-536-537-539>543-DCZ001-MDZ001-003>006-008-011-013-014- 016>018-501>508-VAZ025>031-036>040-050>057-501>508-WVZ050>053-055- 501>506-220000- Chesapeake Bay north of Pooles Island MD- Chesapeake Bay from Pooles Island to Sandy Point MD- Chesapeake Bay from Sandy Point to North Beach MD- Chesapeake Bay from North Beach to Drum Point MD- Chesapeake Bay from Drum Point MD to Smith Point VA- Tidal Potomac from Indian Head to Cobb Island MD- Tidal Potomac from Cobb Island MD to Smith Point VA- Chester River to Queenstown MD-Eastern Bay- Choptank River to Cambridge MD and the Little Choptank River- Patuxent River to Broomes Island MD- Tangier Sound and the inland waters surrounding Bloodsworth Island-District of Columbia-Garrett-Washington-Frederick MD- Carroll-Northern Baltimore-Cecil-Southern Baltimore- Prince Georges-Anne Arundel-Charles-St. Marys-Calvert- Extreme Western Allegany-Central and Eastern Allegany- Northwest Montgomery-Central and Southeast Montgomery- Northwest Howard-Central and Southeast Howard-Northwest Harford- Southeast Harford-Augusta-Rockingham-Shenandoah-Frederick VA-Page- Warren-Clarke-Nelson-Albemarle-Greene-Madison-Rappahannock-Orange- Culpeper-Prince William/Manassas/Manassas Park-Fairfax- Arlington/Falls Church/Alexandria-Stafford-Spotsylvania- King George-Northern Fauquier-Southern Fauquier-Western Highland- Eastern Highland-Western Loudoun-Eastern Loudoun- Northern Virginia Blue Ridge-Central Virginia Blue Ridge- Hampshire-Morgan-Berkeley-Jefferson-Hardy-Western Grant- Eastern Grant-Western Mineral-Eastern Mineral-Western Pendleton- Eastern Pendleton- Including the cities of Washington, Mountain Lake Park, Oakland, Grantsville, Hagerstown, Frederick, Ballenger Creek, Eldersburg, Westminster, Reisterstown, Cockeysville, Elkton, Baltimore, Bowie, Suitland-Silver Hill, Clinton, College Park, Greenbelt, Laurel, Camp Springs, Glen Burnie, Annapolis, Severn, South Gate, Severna Park, Arnold, Odenton, St. Charles, Waldorf, Lexington Park, California, Chesapeake Beach, Huntingtown, Dunkirk, North Beach, Lusby, Prince Frederick, Frostburg, Cumberland, Germantown, Damascus, Bethesda, Rockville, Gaithersburg, Silver Spring, Lisbon, Columbia, Ellicott City, Jarrettsville, Aberdeen, Staunton, Waynesboro, Stuarts Draft, Harrisonburg, Strasburg, Woodstock, Mount Jackson, New Market, Winchester, Luray, Shenandoah, Stanley, Front Royal, Berryville, Lovingston, Charlottesville, Stanardsville, Madison, Orange, Gordonsville, Culpeper, Dale City, Manassas, Woodbridge, Lake Ridge, Montclair, Reston, Herndon, Annandale, Centreville, Chantilly, McLean, Franconia, Arlington, Alexandria, Falls Church, Falmouth, Fredericksburg, Dahlgren, Warrenton, Turnbull, Hightown, Monterey, Purcellville, Leesburg, Ashburn, Sterling, Big Meadows, Wintergreen, Romney, Paw Paw, Martinsburg, Charles Town, Shepherdstown, Moorefield, Bayard, Mount Storm, Petersburg, Elk Garden, Antioch, Keyser, New Creek, Ridgeville, Russelldale, Headsville, Fort Ashby, Riverton, Brandywine, Franklin, Oak Flat, Ruddle, and Sugar Grove 108 PM EDT Mon Jun 21 2021 ...SEVERE THUNDERSTORM POTENTIAL THIS AFTERNOON AND EVENING... A line of strong to severe thunderstorms with damaging wind gusts is expected to sweep east across our region this afternoon into this evening. The risk for severe thunderstorms increases from Marginal Risk over central Virginia, to Slight Risk generally north of I-66 and US-50, to Enhanced Risk along and near the Mason-Dixon Line. Damaging wind gusts are the primary threat, although large hail and an isolated tornado are also possible. The initial line of storms should enter western Maryland and the eastern panhandle of West Virginia between 1 and 4 PM. It is then expected to move east across the Shenandoah Valley and west central Maryland between 3 and 5 PM. The line should reach the Baltimore and Washington metro areas and southern MD between 5 and 8 PM. All times are current best estimates, and people should be ready to seek shelter when storms threaten or warnings are issued.
The Pittsburgh radar (KPBZ), 126 km away, was scanning. The volume nearest the first event began at 18:19 UTC.
47 thunderstorm wind. Local standard time, as filed.
A tree blew down on Cranesville Road.
A tree blew down on Savage River Road near Westernport Road.
Numerous trees were blown down in the Barton and Lonaconing area.
A tree blew down on Collier Run Road Southeast near Oldtown Road.
Multiple trees and wires were blown down in Orleans.
Multiple trees and tree limbs were blown down in and near Hancock, including on MD-144 East Main Street and on Cover Street near North Pennsylvania Avenue.
Multiple trees blew down in and around Big Pool, including one in the 11000 block of MD-56 Big Pool Road, and one on wires near the intersection of MD-56 Big Pool Road and Garrison Hollow Road.
Five trees and numerous tree limbs blew down near Dam Number 5. Siding was partially ripped off a house on Gruber Road.
A couple of trees blew down on MD-34 Shepherdstown pike.
There were more than half a dozen reports of trees blown down in and around Hagerstown, including one in the 1600 block of Fairview Road.
A tree blew down in the 16800 block of Shinham Road northwest of Cearfoss Pike.
Multiple trees blew down in and around Boonsboro, including one on MD-34 Potomac Street near Monroe Road, and one on MD-34 Potomac Street near Wheeler Road. A tree blew down on US-40 Alternate/Old National Pike at Roxbury Road. A tree blew down on MD-66 Mapleville Road near Mount Aetna Road.
Trees blew down on Leiters Mill Road and MD-62 Little Antietam Road in Leitersburg. Trees blew down on MD-77 Foxville Road near Brook Lane.
Two willow trees were uprooted and many large tree limbs were snapped near Ringgold. One tree fell on a residential trailer. There was also siding and shingles blown off a church.
A tree blew down on MD-550 Sabillasville Road near Eylers Valley Flint Road. A couple of trees blew down on MD-77 Foxville Road near Catoctin Mountain Park.
There were five reports of trees and wires blown down in and around Emmitsburg.
A couple of trees were blown down near Harney, including one near the intersection of Piney Point Road and Bowers Road.
Trees blew down on MD-28 Darnestown Road between MD-109 Beallsville Road and Martinsburg Road.
A tree blew down on MD-28 Darnestown Road at Copen Meadow Drive.
Several trees were blown down near Union Bridge, including in the unit block of Bucher John Road and on Main Road.
Trees and large tree limbs blew down near Manchester, including in the 4800 block of Barnhart Hill Road.
A tree blew down in the 4400 block of Cherry Tree Lane.
A tree blew down on southbound I-83 near Exit 31/Middletown Road.
A tree blew down on eastbound I-70 near Exit 87A/US-29 Columbia Pike.
Trees blew down near the intersection of Ivy Mill Road and Cockeys Mill Road.
Trees blew down near the intersection of Trenton Road and Dark Hollow Road. A couple of trees blew down on Gunpowder Road. Trees blew down on Cotter Road. Trees blew down near the intersection of Mount Zion Road and Dover Road.
Trees blew down on Church Lane.
Trees blew down on Log Trail Way. Trees blew down near the intersection of Gwynnbrook Avenue and Owings Mills Boulevard. Trees blew down near the intersection of Garrison Forest Road and Saint Thomas Lane.
A tree blew down on eastbound I-70 near Exit 91A/northbound I-695 Baltimore Beltway Inner Loop. Trees blew down near the intersection of Sugarcone Road and Greenspring Avenue, and on Greenspring Avenue near Green Summit Road.
There were at least half a dozen reports of trees blown down in the northwestern part of Baltimore City.
A tree blew down on Bellona Avenue near Dunlora Road.
Trees blew down near the intersection of Vernon Road and White Hall Road.
A tree blew down near the intersection of Stevenson Lane and Mitten Lane. Trees blew down near the intersection of Hampton Lane and MD-146 Dulaney Valley Road.
A tree blew down on Brock Bridge Road near River Bridge Way.
There were three reports of trees and wires blown down in the Catonsville area.
A tree blew down on Pleasantville Road near Laurel Brook Road.
A tree blew down on MD-165 Old Pylesville Road near Ridge Road. A tree blew down in the 3900 block of Davis Corner Road.
A tree blew down on Walters Mill Road near Shawnee Drive.
A tree blew down on Benfield Boulevard near Veterans Highway.
Multiple trees down on US-1 Conowingo Road, including near MD-273 Rising Sun Road.
A tree blew down in the 2400 block of Old Robinhood Road.
Trees blew down on hole 16 at Bay Hills Golf Club.
A tree blew down on Chesapeake Ridge Lane.
A wind gust of 65 MPH (56 knots) was measured by a mesonet near Cape Saint Claire.
A tree blew down in the 100 block of East Wallace Road.
A tree blew down on MD-545 Blue Ball Road at Childs Road.
Multiple trees were blown down in the Elkton area, including a tree that blew down on MD-213 Lewisville Road near the Maryland/Pennsylvania border.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Maryland in 2021Every state in 2021This day in weather historyWarnings in Maryland, June 2021
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 2026-09-24. Each event’s entry at NCEI: 956223, 956224, 956225, 956227, 956228, 956229, 956230, 956231, 956233, 956235, 956236, 956237, 956238, 956240, 956241, 956242, 956245, 956246, 956247, 956248, 956249, 956250, 956252, 956253, 956254, 956255, 956256, 956257, 956258, 956259, 956260, 956261, 956262, 956263, 956264, 956265, 956266, 956267, 956268, 956269, and more.