A cold front passed through the area on the 24th and it was accompanied by a potent upper-level trough. The upper-level trough caused stronger winds aloft, and storms that developed were able to drag these stronger winds down to the surface.
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 cold front passed through the area on the 24th and it was accompanied by a potent upper-level trough. The upper-level trough caused stronger winds aloft, and storms that developed were able to drag these stronger winds down to the surface.
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 24, 9:26 AM EST, 3 hours 30 minutes earlier.
Area Forecast Discussion National Weather Service Baltimore MD/Washington DC 1026 AM EDT Sun Jun 24 2018 .SYNOPSIS... Low pressure moving eastward across New England will send a cold front south across the Mid-Atlantic tonight. High pressure will build from southern Ontario across the eastern Great Lakes toward the region Monday into Tuesday, then move into the Atlantic Tuesday night as a developing warm front approaches from the south. The warm front should move north into Pennsylvania Wednesday as low pressure moves from the central Plains to the Great Lakes. A cold front will follow Thursday as the low moves across the northeastern U.S. The front will likely fall apart as it crosses. A Bermuda high will then establish itself over the western Atlantic next weekend. && .NEAR TERM /THROUGH TONIGHT/... Skies have cleared over some areas this morning with highest cloud cover over higher elevations, the I-95 corridor and central/southern MD. Patchy fog is no longer and issue and a few showers have been moving between DC and near Charlottesville early this morning but have been dissipating in the last hour. A front is stalled over our CWA this morning with light flow over our area. Low pressure will move offshore from New England today, which in conjunction with a mid-upper level trough axis, will drag a surface cold front across the region, mainly during the very late afternoon to evening hours. South of this boundary, it will be warm and unstable once again...especially across central Virginia and southern Maryland where there is a strong probability of SBCAPE greater than 1000 j/kg. (Some HiResW solutions suggest MUCAPE up to 2000 j/kg. However, there is considerable spread as well, as evidenced by 3-hour SREF MUCAPE and MLCAPE plumes. Sufficient bulk shear effective 30-40 kt) exists as well. However, lapse rates marginal (5.0-5.5 C/km), and westerly flow provides some inhibition, not to mention the lack of well-defined convergence. Recent RAP/HRRR runs remain the least robust solutions, with minimal thunderstorm development. Do believe that scattered thunderstorms will develop this afternoon, especially late in the day in vicinity of the subtle surface boundary and mid-level positive vorticity as they encounter the pool of unstable air. It is plausible that a strong storm or two could form. However, there are enough mitigating factors and spread in model output to preclude more than scattered coverage of thunderstorms, and no enhanced wording at this time. Any storms that do develop should move southeast of southern Maryland by early this evening as the cold front crosses the forecast area. Cool/dry advection will infiltrate overnight. && .SHORT TERM /MONDAY THROUGH TUESDAY NIGHT/... Lower dewpoints (lower-mid 60s) will truly be realized after mixing resumes Monday morning. Canadian high pressure will reside across the northeastern United States, providing northwest flow...becoming northeast by Monday evening. Certainly, more sun and lower temperatures than this weekend. Highs generally lower-mid 80s. Lows could drop into the 50s Monday night across northern Maryland and the Potomac Highlands; lower 60s elsewhere. High pressure will remain the dominating force into Tuesday. In the evening, low pressure/shortwave energy will be tracking across the Great Lakes. The forward speed of this system still in doubt. Have delayed the arrival of more rain in amplified flow, keeping Tuesday and Tuesday evening dry, and confining any chance of precip to the Blue Ridge west late Tuesday night. Have favored climo trends in identifying this precipitation as just showers. It does remain possible that some elevated instability may overspread the mountains after midnight, which can be included later if those trends hold. && .LONG TERM /WEDNESDAY THROUGH SATURDAY/... A developing warm front will approach from southern Virginia Wednesday morning as a surface high shifts off the New England coast. This front should approach the Mason-Dixon line during the afternoon as low pressure moves across the Great Lakes from the central Plains. The surface low will be occluding and weakening as the upper trough forcing it fills and gets reabsorbed into the larger scale westerly flow through the day, but a decent 850-500 mb wind field will result in substantial speed shear. The aforementioned warm front and the presence of a lee surface trough will likely result in scattered showers and thunderstorms Wednesday afternoon and evening. A few storms could be accompanied by gusty winds given 30-40 kts of mid level flow, but airmass recovery and destabilization as well as the magnitude of forcing brings into question how widespread stronger storms will be. The surface low will depart up the Saint Lawrence River Valley and through northeastern CONUS Thursday, with its attendant surface front dropping southward into the Mid-Atlantic. The upper forcing will be quickly departing, so the front should largely fall apart by Friday as it drifts south. Still, a few pop up showers or storms are possible Thursday afternoon as the front crosses. Long range operational and ensemble guidance is in unanimous agreement on the development of surface high pressure developing over the western Atlantic Friday into next weekend, with a 594+ DM ridge at 500 hPa overhead. This would result in very warm to hot and humid weather as 850 hPa temps rise to around 20 C. && .AVIATION /14Z SUNDAY THROUGH THURSDAY/... No restrictions are being observed at this moment over the terminals and am expecting conditions to remain that way until this afternoon with an increase in cloud cover and the chance of scattered showers/thunderstorms, however coverage is still uncertain at this time. Any storms should end by sunset, or very soon thereafter...from northwest (MRB) to southeast (CHO- DCA) A cold front will slowly turn winds more westerly early this evening. Humidity will be slow to erode though, so another night of patchy fog possible. At this point, kept vsby restrictions away from terminals aside from a couple of hours immediately before dawn. Building high pressure will provide tranquil flight conditions Monday into Tuesday. Winds will be northwest Monday, with return flow arriving Tuesday. Some patchy sub-VFR fog or lower ceilings are possible Wednesday AM before a weak warm front lifts north toward the PA border. Scattered showers and a few gusty thunderstorms are possible Wednesday PM which could result in brief restrictions. Winds will generally be southerly around 10 kts, gusting to 20 kts Wed afternoon outside of any convection. A weakening cold front will move south across the Mid-Atlantic Thu with patchy sub-VFR is possible again in the AM, d possibly a pop up shower/storm in the afternoon. Winds W AOB 10 kts. && .MARINE... Winds over the waters are less than 10 kt this morning. Scattered thunderstorms will develop late this afternoon...a few of which may contain locally strong winds. Any thunderstorms will end soon after sunset as a cold front crosses the waters. Winds will veer west, but mixing not likely to improve until after sunrise Monday. Guidance suggesting full mixing will support winds approaching by not reaching Small Craft criteria. Have capped winds just under at this time. The pressure gradient will weaken Monday night into Tuesday as high pressure builds across the waters. Despite warm air over relatively cooler air Wednesday, the gradient should be strong enough to result in some SCA level gusts on southerly flow. Scattered afternoon and evening storms are possible, more isolated Thursday with lighter winds. && .TIDES/COASTAL FLOODING... Anomalies should continue to decrease on westerly to northwesterly flow through Tuesday. Minor flooding is still possible through Monday morning on the upper tidal Potomac shoreline due to some added freshwater input, but overall the tidal flood threat should be very low. Onshore flow will cause anomalies to increase again during the middle of the week in tandem with a full moon (Thursday), resulting in a renewed potential of more widespread (minor) tidal flooding. && .LWX WATCHES/WARNINGS/ADVISORIES... DC...None. MD...None. VA...None. WV...None. MARINE...None. && SYNOPSIS...DHOF NEAR TERM...IMR/HTS SHORT TERM...HTS LONG TERM...DHOF AVIATION...IMR/HTS/DHOF MARINE...HTS/DHOF TIDES/COASTAL FLOODING...DHOF
Hazardous Weather Outlook National Weather Service Baltimore MD/Washington DC 508 AM EDT Sun Jun 24 2018 ANZ530>543-DCZ001-MDZ011-013-014-016>018-508-VAZ052>057-250915- 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-Southern Baltimore-Prince Georges- Anne Arundel-Charles-St. Marys-Calvert-Southeast Harford- Prince William/Manassas/Manassas Park-Fairfax- Arlington/Falls Church/Alexandria-Stafford-Spotsylvania- King George- 508 AM EDT Sun Jun 24 2018 This Hazardous Weather Outlook is for the Maryland portion of the Chesapeake Bay, Tidal Potomac River, and adjacent counties in central Maryland and northern Virginia as well as the District of Columbia. .DAY ONE...Today and Tonight Scattered showers and thunderstorms may produce gusty winds over the waters this afternoon and evening. .DAYS TWO THROUGH SEVEN...Monday through Saturday No hazardous weather is expected at this time. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time. MDZ003>006-501>507-VAZ025>031-036>040-050-051-501>508-WVZ050>053- 055-501>506-250915- Washington-Frederick MD-Carroll-Northern Baltimore- Extreme Western Allegany-Central and Eastern Allegany- Northwest Montgomery-Central and Southeast Montgomery- Northwest Howard-Central and Southeast Howard-Northwest Harford- Augusta-Rockingham-Shenandoah-Frederick VA-Page-Warren-Clarke- Nelson-Albemarle-Greene-Madison-Rappahannock-Orange-Culpeper- 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- 508 AM EDT Sun Jun 24 2018 This Hazardous Weather Outlook is for eastern West Virginia, northern and central Virginia, and central and western Maryland with the exception of Garrett County. .DAY ONE...Today and Tonight No hazardous weather is expected at this time. .DAYS TWO THROUGH SEVEN...Monday through Saturday No hazardous weather is expected at this time. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time. DHOF
The Roanoke radar (KFCX), 162 km away, was scanning. The volume nearest the first event began at 17:57 UTC.
19 thunderstorm wind. Local standard time, as filed.
A tree was down along the 4500 block of Morris Mill road.
A tree was down at the intersection of Springhill Road and Berry Farm Road.
A horse trailer was blown down a hill. About 30 to 40 trees were damaged or destroyed. Two out buildings with walls were dislodged by 1 to 2 feet from normal position.
A tree was down near the intersection of Pris Heights Lane and Blue Ridge Mountain Road.
A tree was down near the intersection of Pea Bridge Road and Dyke Road.
A tree was down on the 7000 block of Free Union Road.
A tree was down near the 1200 block of Middle River Road and powerlines were down near the 500 block of Redbud Drive.
A tree was down near the intersection of Snickersville Turnpike and Yellow Schoolhouse Road.
A tree was down near the intersection of Paxson Road and Airmont.
A tree was down near the intersection of Madison Road and Dundee Road. A tree was also down at the intersection of Seminole Trail and Fredericksburg Road.
A tree was down near the 7000 block of Amicus Road. A tree was also down at the intersection of Dairy road and Seminole Trail.
A tree was down near the intersection of Seville Road and Seminole Trail.
A tree was down at the 800 block of Hammocks Gap Road.
A tree was down on Lonnie Burke Road near north Seminole Trail.
A tree was down along the 1000 block of Preston Avenue.
A tree was down at the 6000 block of Louisa Road. A tree was also down at the intersection of Gordonsville Road and Stoney Point Pass as well as Riverbend Drive and Pantops Drive.
A tree was down on the 15000 block of Monrovia Road.
A tree was down on the 7000 block of Morris Road.
A tree was down on the 5000 block of Mudd Tavern Road.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Virginia in 2018Every state in 2018This day in weather historyWarnings in Virginia, June 2018
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: 756933, 756935, 756936, 756937, 756938, 756939, 756943, 756941, 756945, 756958, 756944, 756959, 756960, 756961, 756962, 756963, 756964, 756965, 756966.