An isolated severe thunderstorm produced tree damage near Westernport and Luke.
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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.
An isolated severe thunderstorm produced tree damage near Westernport and Luke.
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 Aug 29, 2:17 PM EST, 3 hours 13 minutes earlier.
Area Forecast Discussion National Weather Service Baltimore MD/Washington DC 317 PM EDT Sun Aug 29 2021 .SYNOPSIS... A front stalled near the Blue Ridge Mountains will retreat northeastward as a warm front through tonight. A cold front will slowly approach from the Great Lakes Monday into Monday night. This front will stall overhead during the middle of the week as the remnants of Ida approach from the Tennessee River Valley. The cold front and remnants of Ida should move offshore late in the week, giving way to building high pressure for next weekend. && .NEAR TERM /UNTIL 6 AM MONDAY MORNING/... A stalled front near the Blue Ridge Mountains marks the difference between relatively cloudier and more stable conditions to its east, and more unstable conditions ripe for convection to its west. A convergence axis was evident as a towering line of cumulus directly over the spine of the Allegheny Front as of mid afternoon, and convection will likely continue to initiate in the vicinity of this axis. Slow storm motions could again lead to isolated heavy rainfall totals and flooding/flash flooding, and isolated damaging downburst winds are possible beneath the stronger thunderstorms cores given sufficient CAPE/DCAPE. The focus for convection should be west of I-81 and especially near the Allegheny Front through early this evening. To the west, convection over OH/WV may move toward the area tonight. A weak wave aloft coupled with warm and moist advection in the low levels may result in a few showers or thunderstorms developing/moving over parts of the area late tonight into Monday morning. && .SHORT TERM /6 AM MONDAY MORNING THROUGH TUESDAY NIGHT/... A cold front approaching from the Great Lakes will slowly move toward and eventually into the Mid-Atlantic Monday into Monday night. There is uncertainty in the extent of any early morning cloud cover and shower activity, and that will play a role in how unstable it gets and how strong or widespread thunderstorms will become later in the day. There is a bit of a modest enhancement to the flow aloft expected, so storms may have a bit more organization to them. Gusty to damaging winds and a few instances of flooding are possible. By Tuesday, the remnants of Ida will be moving northeastward across the Tennessee River Valley. Meanwhile, Monday's front will be stalling overhead. This likely sets the stage for scattered to numerous showers and thunderstorms, with the probability of more widespread and potentially heavy rain increasing markedly after midnight Tuesday night. && .LONG TERM /WEDNESDAY THROUGH SUNDAY/... Please reference the National Hurricane Center for the latest details on the track and strength of Ida. Ida will likely continue to be steered northeast by an approaching trough during the middle of the week. It is becoming increasingly likely that our region will be affected. There is an increasing flood/flash flood risk with a potentially prolonged period of heavy rainfall from showers and thunderstorms Wednesday into Wednesday night. The track will determine the placement, extent, and severity of flooding and/or severe thunderstorm and tornado threats. There is also a threat for tidal flooding depending on the track of the remnants. Mainstem river rises and additional flooding is possible late in the week even after the heaviest rainfall has gone. The remnants' track and intensity is still a bit uncertain. It should be moving away by Thursday. This will set the stage for a couple of refreshing days as Canadian high pressure surges southward. Daytime temperatures will be in the upper 70s and lower 80s with dew points in the 50s. Overnight lows will be in the 50s to around 60, with some 40s possible in the mountains. Return flow may result in a slight warming trend by Saturday, but precipitation is forecast to hold off at this time. && .AVIATION /19Z SUNDAY THROUGH FRIDAY/... Conditions have largely improved to VFR (except at CHO/MRB where MVFR likely continues through mid afternoon). TSRA may approach CHO 21-24z, with shower or iso tstm activity possible from MRB eastward to the metro terminals late tonight into Mon AM. Patchy fog and low clouds are likely again overnight, as well. Additional showers and thunderstorms are possible Monday afternoon and evening and Tuesday afternoon, perhaps becoming more widespread later Tuesday night as the remnants of Ida approach. Please refer to the National Hurricane Center for details on Ida. Wednesday's forecast will depend on the remnants of Hurricane Ida, but heavy rain, thunderstorms, and low ceilings are all possible. Improving conditions should arrive by Thursday. && .MARINE... Generally light flow is expected through Tuesday, though periodic showers and thunderstorms could result in locally gusty winds, higher waves, and lightning strikes. Winds may increase Wednesday into Thursday as the remnants of Hurricane Ida pass through the region, but details remain uncertain at this time. Please refer to the National Hurricane Center for details on Ida. && .TIDES/COASTAL FLOODING... Slightly above normal tide levels persist, higher to the south due to north/northeast winds. By late this afternoon into tonight, the winds will relax and perhaps turn to the east or south. Anomalies of around a foot would put Annapolis and DC SW Waterfront close to, but not over, minor flood stage tonight. Overall, the forecast falls in between the flatter ETSS and aggressive (minor flooding at several locations) CBOFS and Stevens ensemble. Anomalies should decrease a little for the first part of the week, but increasing southerly winds ahead of the remnants of Ida could result in tidal flooding around midweek. && .LWX WATCHES/WARNINGS/ADVISORIES... DC...None. MD...None. VA...None. WV...None. MARINE...None. && SYNOPSIS...DHOF NEAR TERM...DHOF SHORT TERM...DHOF LONG TERM...KLW AVIATION...KLW/DHOF MARINE...KLW/DHOF TIDES/COASTAL FLOODING...ADS/DHOF
Hazardous Weather Outlook National Weather Service Baltimore MD/Washington DC 530 AM EDT Sun Aug 29 2021 ANZ530>543-DCZ001-MDZ008-011-013-014-016>018-504-506-508- VAZ052>057-300930- 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- 530 AM EDT Sun Aug 29 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...Today and Tonight No hazardous weather is expected at this time. .DAYS TWO THROUGH SEVEN...Monday through Saturday Scattered thunderstorms are expected on Monday, which may produce isolated instances of damaging winds and flash flooding during the afternoon. The remnants of Ida will impact the region on Wednesday. Showers and thunderstorms associated with this system could bring scattered severe thunderstorms and scattered instances of flash flooding. .SPOTTER INFORMATION STATEMENT... Spotter activation may be necessary on Wednesday. MDZ003>006-503-505-507-VAZ025>031-036>040-050-051-501-502-505>508- WVZ050>053-055-300930- 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- 530 AM EDT Sun Aug 29 2021 This Hazardous Weather Outlook is for portions of eastern West Virginia, northern and central Virginia, and central and western Maryland. .DAY ONE...Today and Tonight Isolated instances of flash flooding are possible across portions of the Shenandoah Valley and Central Virginia this afternoon and evening. An isolated severe thunderstorm with brief damaging wind gusts is also possible in the same area. .DAYS TWO THROUGH SEVEN...Monday through Saturday Scattered thunderstorms are expected on Monday, which may produce isolated instances of damaging winds and flash flooding during the afternoon. The remnants of Ida will impact the region on Wednesday. Showers and thunderstorms associated with this system could bring isolated severe thunderstorms and scattered instances of flash flooding. .SPOTTER INFORMATION STATEMENT... Spotter activation may be necessary on Wednesday. MDZ001-501-502-VAZ503-504-WVZ501>506-300930- Garrett-Extreme Western Allegany-Central and Eastern Allegany- Western Highland-Eastern Highland-Western Grant-Eastern Grant- Western Mineral-Eastern Mineral-Western Pendleton- Eastern Pendleton- 530 AM EDT Sun Aug 29 2021 This Hazardous Weather Outlook is for the Allegheny Front counties in western Maryland, eastern West Virginia, and Highland County Virginia. .DAY ONE...Today and Tonight Isolated instances of flash flooding are possible this afternoon and evening. An isolated severe thunderstorm with brief damaging wind gusts is also possible, mainly in Highland, Pendleton, and Grant Counties. .DAYS TWO THROUGH SEVEN...Monday through Saturday Scattered thunderstorms are expected on Monday, which may produce isolated instances of damaging winds and flash flooding during the afternoon. Locally heavy rain may begin Tuesday and Tuesday night, which could cause an isolated instance of flooding. The remnants of Ida will impact the region on Wednesday. Showers and thunderstorms associated with this system could bring isolated severe thunderstorms and scattered instances of flash flooding. .SPOTTER INFORMATION STATEMENT... Spotter activation may be necessary on Wednesday. CJL
The Sterling radar (KLWX), 146 km away, was scanning. The volume nearest the first event began at 22:31 UTC.
1 thunderstorm wind. Local standard time, as filed.
Two trees blew down in the Westernport and Luke area: one on wires on Riordan Road, and one on MD-135 Pratt Street.
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, August 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: 971064.