A couple of isolated severe thunderstorms produced very localized wind damage near Baltimore, and in eastern West 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.
A couple of isolated severe thunderstorms produced very localized wind damage near Baltimore, and in eastern West 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 Aug 6, 2:47 PM EST, 4 hours 11 minutes earlier.
Area Forecast Discussion National Weather Service Baltimore MD/Washington DC 347 PM EDT Tue Aug 6 2024 .SYNOPSIS... A initially stationary boundary will slowly drop southward through the area as a cold front later tonight into the day tomorrow. The remnants of Debby will approach from the south Thursday night into Friday, before passing to our northeast on Saturday. && .NEAR TERM /THROUGH TONIGHT/... Current regional mosaic radar imagery shows four areas of ongoing convection. The first area of convection is a single storm that formed along a low-level convergence line (potentially locally strengthened by the Bay Breeze circulation) which stretches from just northeast of Baltimore to near Leesburg. The single storm just to the northeast of Baltimore has already produced localized damaging winds and instances of flooding. An additional storm or two can't be ruled out along this convergence line this afternoon, but activity is expected to remain rather isolated in nature. A second area of convection is located across southeastern PA. This activity is expected to slowly lift off toward the east- northeast, and shouldn't directly impact the area. The third and fourth areas of convection are located off to our northwest across western PA, and then well to our northwest across northwestern OH. These will be the two areas of storms that could potentially impact the area later this evening and into the overnight. The ongoing storms across southwestern PA have produced numerous instances of wind damage and severe hail. These initially isolated storms are in the process of developing a conglomerate outflow, and should shortly develop into an MCS and start progressing off to the south and east. The storms in Ohio are also in the process of growing upscale into an MCS, and will also eventually track off toward the south and east. Most CAM guidance isn't handling either of these ongoing areas of convection well, as they're located a bit further south and east than originally expected. Both of these complexes of storms should dive southeastward toward the area heading into this evening. As the storms in western PA build southward into western and central MD and the WV Panhandle, they will encounter an environment characterized by lesser instability (around 500-1000 J/kg) and lesser deep layer shear, so questions remain about how well they will hold together. However, if they're able to develop a strong enough cold pool, damaging wind gusts may be possible. If storms are able to make it into northeast MD, greater instability is present (MLCAPE around 2000 J/kg), which may help to maintain the storms a bit more. Both damaging wind gusts and instances of flash flooding may be possible across northeast Maryland this evening as these storms move through. The activity currently in OH may potentially move through during the overnight. A Flood Watch has been issued for Cecil, Harford, and Baltimore Counties through 4 AM as a result of the potential for flash flooding from these multiple rounds of storms. Chances for storms gradually decrease with southward progression across the forecast area. Some storms may potentially make it as far south as the I-66/US-50 corridor tonight, but should be weakening as they do so. Storms aren't expected to make into central VA or southern MD. && .SHORT TERM /WEDNESDAY THROUGH THURSDAY NIGHT/... The remnants of Debby will remain well to our south tomorrow as high pressure builds to our north over Quebec. This will encourage the frontal boundary to our north today to drop southward into our area. Additional showers and thunderstorms will be possible throughout the day within moist easterly flow. Outside of any precipitation, cloudy skies and cooler temperatures are expected, with high temperatures in the 80s. Showery and overcast conditions are expected on Thursday within a low-level warm advection regime ahead of Debby's remnants. Temperatures will be notably cooler, with highs only in the upper 70s and lower 80s. By Thursday night, Debby's remnants will begin to feel the influence of large scale troughing to our northwest over the Great Lakes. This will draw the remnant circulation northward, potentially allowing heavier rainfall to make it into southern portions of the forecast area prior to daybreak on Friday. && .LONG TERM /FRIDAY THROUGH TUESDAY/... The remnant low pressure system of TC Debby is likely to move across the area sometime Friday into Friday night. Aloft, an approaching upper trough begins to pull northward the mid-level vorticity signature of Debby, while also interacting with a stalled frontal boundary over the area. Deep tropical moisture, with PWATs well over 2.2-2.4", surge into the area on strengthening low-level southerly flow. The area is going to be near the favorable right-entrance region of an upper level jet streak over the far easter Great Lakes. In addition, strong divergence is noted upstream of the mid-level vort max of remnant TC Debby. These conditions should cause the remnant surface to low to deepens as it moves northeast through the area, which in turn is likely to increase the potential for locally heavy rainfall and gale force winds over the waters. Stable temperatures in this deeply saturated environment will be mostly in the upper 70s to low 80s, with small diurnal variability. Heavy Rainfall / Flash Flooding Threat: At the very least, the remnants of TC Debby are likely to bring beneficial rainfall to most of the area, especially those west of the Blue Ridge where an Extreme Drought is ongoing. Most of this rain is expected to fall over a 36-48 hour period starting Thursday morning. Widespread rainfall amounts of 2-4" are likely, with isolated higher amounts of 6" possible. This does not take into account any localized heavy rain that may occur Wednesday as the stalled front sags south into our area. A Flood Watch is likely to be issued for most of the area over the next 24 hours as it becomes more clear where the heaviest rain will occur. This rain is likely to produce scattered instances of flash flooding, mainly in urban centers. Repeated rounds of heavy rain and/or a training band of heavy rain could result in significant flash flooding if it occurs over an urban area. Continue to monitor the weather as the forecast becomes more certain in the days ahead. Tornado Threat: A tornado threat could develop over parts of the area sometime on Friday, most likely during peak heating in the afternoon to early evening. The greatest threat looks to be along and east of US-15. Now this threat is very conditional, and based on where the exact track of the surface low. Aloft, a LLJ on the eastern side of the surface low brings in 40-50KT of SSE/S flow above steady ESE/SE winds at the surface. Long, curved hodographs are possible, with very high low-level SRH values progged in some of the model guidance. The remnants of TC Debby are absorbed by a large upper trough to our north and quickly speed away from the area. Lingering showers and thunderstorms on the backside of the system quickly move out from west to east Saturday morning. Most of the area should be dry come Saturday afternoon. Surface high pressure builds in Saturday night into the start of next week. Upper troughing continues across much of the Great Lakes to Northeast CONUS into next week. Dry conditions expected Sunday and Monday, with below normal highs in the low to mid 80s. Overnight lows in the 60s. && .AVIATION /18Z TUESDAY THROUGH SUNDAY/... Prevailing VFR conditions are expected through the remainder of the afternoon. A few thunderstorms have popped up in the vicinity of MTN and BWI, and a few additional storms may be possible through late afternoon. Additional thunderstorms are ongoing across western PA, and may drop toward the terminals late this afternoon into this evening. Showers and thunderstorms may linger into the overnight. MVFR ceilings are expected to develop overnight and continue into the day tomorrow. Additional thunderstorms may be possible during the day tomorrow. Sub-VFR conditions and rainfall will continue into Thursday as the remnants of Debby approach from the south. Widespread moderate to heavy rainfall is likely Friday into Friday night as the remnants of TC Debby move across the region. Periods of sub-VFR conditions are likely, with gusty winds in the strongest bands. East winds shift to west, then southwest as the low pressure center moves through, then becomes northwest Saturday afternoon as high pressure builds into the region. Lingering showers and thunderstorms possible through Saturday morning, then conditions quickly dry out in the afternoon. VFR and conditions expected Saturday night through Monday. && .MARINE... SCAs are in effect for all waters today within southerly flow. SMWs may be needed for any storms that move over the waters this afternoon into tonight. Additional SCAs will be possible in southeasterly flow tomorrow. SCAs appear likely within easterly flow on Thursday. The remnants of TC Debby are likely to move across the area sometime Friday into Friday night. This brings widespread moderate to heavy rainfall, as well as SCA conditions that continue through at least Saturday night. There is also an increasing likelihood of gale-force winds in the waters of the Chesapeake Bay south of North Beach and across the Lower Tidal Potomac sometime Friday into Saturday morning. However, it should be noted this will be highly dependent on where the surface low pressure tracks. Continue to monitor the forecast for updates in the coming days. As the remnants of TC Debby pull away from the area Saturday morning into Saturday afternoon, winds turn northwest and slowly weaken through the day. Sub-SCA winds return Saturday night. && .TIDES/COASTAL FLOODING... Onshore flow is expected to increase Thu night and peak Friday afternoon. With the more westward and faster trend on the fcst track of Debby, expect water levels to rise earlier than anticipated. Minor coastal flooding is expected with stronger srly flow resulting in higher water levels. Low end moderate coastal flooding is possible, but not likely. Water levels should start decreasing rapidly late Fri night and early Saturday. && .LWX WATCHES/WARNINGS/ADVISORIES... DC...None. MD...Small Craft Advisory until 5 AM EDT Wednesday for MDZ008. VA...None. WV...None. MARINE...Small Craft Advisory until 5 AM EDT Wednesday for ANZ530>543. && SYNOPSIS...KJP NEAR TERM...KJP SHORT TERM...KJP LONG TERM...KRR AVIATION...KJP/KRR MARINE...KJP/KRR TIDES/COASTAL FLOODING...LFR
Hazardous Weather Outlook National Weather Service Baltimore MD/Washington DC 439 PM EDT Tue Aug 6 2024 ANZ530>543-DCZ001-MDZ008-011-013-014-016>018-504-506-508- VAZ053>057-527-072045- 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-Fairfax-Arlington/Falls Church/Alexandria- Stafford-Spotsylvania-King George- Central and Southeast Prince William/Manassas/Manassas Park- 439 PM EDT Tue Aug 6 2024 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...Tonight Isolated severe thunderstorms are possible this afternoon and evening, mainly along and north of US Route 50. The primary threat with these storms is damaging wind gusts. A Flood Watch is in effect across northeastern Maryland for the threat of flash flooding due to heavy rainfall until 4 AM Wednesday morning. Flash flooding is also possible down into the Washington, D.C. metro area, though confidence is not as high. .DAYS TWO THROUGH SEVEN...Wednesday through Monday Tropical Cyclone Debby will approach the region later this week, potentially bringing impacts Thursday night through Saturday morning. Potential impacts include flooding due to heavy rainfall, tornadoes, gusty winds, tidal flooding, and Gale force winds over the waters. For the latest information on the track and potential impacts from Debby, please consult forecasts from the National Hurricane Center at hurricanes.gov. .SPOTTER INFORMATION STATEMENT... Spotter activation may be needed Thursday and Friday. MDZ003>006-503-505-507-VAZ025>031-036>040-050-051-501-502-505>508- 526-WVZ050>053-055-072045- 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-Northwest Prince William-Hampshire- Morgan-Berkeley-Jefferson-Hardy- 439 PM EDT Tue Aug 6 2024 This Hazardous Weather Outlook is for portions of eastern West Virginia, northern and central Virginia, and central and western Maryland. .DAY ONE...Tonight Isolated severe thunderstorms are possible this afternoon and evening, mainly along and north of US Route 50. The primary threat with these storms is damaging wind gusts. Training thunderstorms may result in scattered instances of flash flooding this evening through the night, particularly across central Maryland. Flash flooding is also possible into portions of northern Virginia, though confidence is not as high. .DAYS TWO THROUGH SEVEN...Wednesday through Monday Tropical Cyclone Debby will approach the region later this week, potentially bringing impacts Thursday night through Saturday morning. Potential impacts include flooding due to heavy rainfall, tornadoes, and gusty winds. For the latest information on the track and potential impacts from Debby, please consult forecasts from the National Hurricane Center at hurricanes.gov. .SPOTTER INFORMATION STATEMENT... Spotter activation may be needed Thursday and Friday. MDZ001-501-502-VAZ503-504-WVZ501>506-072045- Garrett-Extreme Western Allegany-Central and Eastern Allegany- Western Highland-Eastern Highland-Western Grant-Eastern Grant- Western Mineral-Eastern Mineral-Western Pendleton- Eastern Pendleton- 439 PM EDT Tue Aug 6 2024 This Hazardous Weather Outlook is for the Allegheny Front counties in western Maryland, eastern West Virginia, and Highland County Virginia. .DAY ONE...Tonight Isolated severe thunderstorms are possible this afternoon and evening, mainly from Grant County northward. The primary threat with these storms is damaging wind gusts. .DAYS TWO THROUGH SEVEN...Wednesday through Monday Tropical Cyclone Debby will approach the region later this week, potentially bringing impacts Thursday night through Saturday morning. Potential impacts include flooding due to heavy rainfall, tornadoes, and gusty winds. For the latest information on the track and potential impacts from Debby, please consult forecasts from the National Hurricane Center at hurricanes.gov. .SPOTTER INFORMATION STATEMENT... Spotter activation may be needed Thursday and Friday.
Preliminary Local Storm Report
National Weather Service Baltimore MD/Washington DC
313 PM EDT Tue Aug 06 2024
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0237 PM Tstm Wnd Dmg 1 S Perry Hall 39.40N 76.48W
08/06/2024 Baltimore MD Trained Spotter
Tree down at the 8000 block of Babikow Rd
&&
Event Number LWX2403793
LFRPreliminary Local Storm Report
National Weather Service Baltimore MD/Washington DC
439 PM EDT Tue Aug 06 2024
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0339 PM Flash Flood 1 NE Fullerton 39.38N 76.50W
08/06/2024 Baltimore MD Dept of Highways
White Marsh Blvd closed due to high water flowing
across the road.
&&
Event Number LWX2403794
CPBThe Sterling radar (KLWX), 117 km away, was scanning. The volume nearest the first event began at 23:59 UTC.
1 thunderstorm wind. Local standard time, as filed.
Numerous trees blew down around Crystal Valley Estates.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in West Virginia in 2024Every state in 2024This day in weather historyWarnings in West Virginia, August 2024
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: 1207671.