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.
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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.
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, 1:54 PM EST, 3 hours 36 minutes earlier.
Area Forecast Discussion National Weather Service Baltimore MD/Washington DC 254 PM EDT Sun Jun 24 2018 .SYNOPSIS... Slow moving cold front stalled over our area will be south of our region tonight. High pressure will build over us Monday into Tuesday. A low pressure system moving across the Great Lakes will bring a warm front Wednesday followed by a cold front Thursday. High pressure will build behind the front by the end of the week and into the weekend. && .NEAR TERM /THROUGH TONIGHT/... A low pressure system will move off of the New England coast tonight and along with the upper levels a trough axis, will push south the cold front that has been stalling over our area today. The front should be out of our region this evening into the early night. SBCAPE is between 1000 to 2000 J/kg, Effective Bulk Shear between 30 and 40 knots with Lapse Rates around 5.5 C/km and westerly flow. Instability south of this boundary has allowed for the development of showers and thunderstorms, some of them severe. Most High-Res guidance is suggesting that the main thunderstorm action will remain in Central Virginia and Southern Maryland. Expect showers and thunderstorms to continue to develop across the area this afternoon and evening with conditions becoming drier and cooler behind the cold front overnight. && .SHORT TERM /MONDAY THROUGH TUESDAY NIGHT/... Canadian high pressure will build from the north on Monday allowing for northwesterly flow and lower dew points over our area. High temperatures will be in the low to mid 80s on Monday, and low 80s on Tuesday, meanwhile high temperatures will reach the 70s at higher elevations. High pressure will remain in control on Tuesday and will be centered off of the New England coast on Tuesday. Flow will become easterly to southeasterly. Upper level energy may enhance some showers but guidance is suggesting it will be more in the overnight hours. && .LONG TERM /WEDNESDAY THROUGH SUNDAY/... A weakening surface low will be moving along the US/Canada border throughout the day on Wednesday. At the same time, a surface high pressure will be shifting off the east coast. Southerly flow will push the warm front associated with the aforementioned low through through the region on Wednesday morning. This, along with the formation of a lee surface trough, should result in scattered showers and thunderstorms in the afternoon, with the best chances occurring in northern MD and northern VA. Given 30-40 kt flow at the mid levels, some storms could be accompanied by gusty winds. However, given the residual cloud cover from the warm frontal passage in the morning, the amount of instability available will be in question by the afternoon. With the southerly flow out ahead of the cold front, temperatures will begin to increase, with max temperatures into the mid 80s. The surface low departs to the northeast early on Thursday, which will drag a cold front through the region. This will bring another chance for some pop up showers and storms Thursday afternoon, especially given max temperatures in the low to mid 90s and dew points in the low 70s. Forcing seems to be relatively weak with the frontal passage, but enough instability should exist for at least some scattered development. A strong upper level ridge looks to move into the area on Friday through the weekend, bringing dry conditions back to the region. High temperatures will be very warm, with max temperatures expected to be in the mid 90s. && .AVIATION /SUNDAY THROUGH THURSDAY/... No restrictions are being observed over the terminals at this moment but showers and thunderstorms have started to develop early this afternoon and may affect the terminals this afternoon/evening. Coverage is still uncertain so have kept some VCTS. Storms are expected to end by sunset or shortly thereafter. A front will move through this evening and winds will turn more westerly behind it. With still some humidity left, patchy fog is still possible tonight. A high pressure will build over us on Monday and remain in control through Tuesday allowing for mainly VFR condtions. Sub VFR ceilings are possible on Wednesday morning with the passage of a warm front. Later in the afternoon, scattered thunderstorms should develop across the region, bringing another chance for some sub-VFR conditions. Thursday will be very similar, as a weak cold front moves through the region. && .MARINE... Winds over the waters have remained below Small Craft criteria today. Mixing will allow for some breezy conditions today but expecting gusts to remain below criteria. However scattered thunderstorms may produced locally strong winds this afternoon/evening. The pressure gradient will weaken Monday night into Tuesday as high pressure builds over the area, therefore not anticipating any Small Craft Advisory during this time. SCA criteria winds will be possible on Wednesday, given a strong gradient across the region, and southerly flow. Scattered showers and thunderstorms on Wednesday and isolated showers and storms Thursday afternoon could result in additional gusty winds on the waters. && .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...IMR NEAR TERM...IMR SHORT TERM...IMR LONG TERM...CJL AVIATION...IMR/CJL MARINE...IMR/CJL TIDES/COASTAL FLOODING...DHOF
Hazardous Weather Outlook National Weather Service Baltimore MD/Washington DC 539 PM EDT Sun Jun 24 2018 ANZ530>543-DCZ001-MDZ011-013-014-016>018-508-VAZ052>057-252145- 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- 539 PM 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...Tonight Scattered showers and thunderstorms may produce isolated instances of severe weather this 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>506-252145- 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- 539 PM 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...Tonight Scattered showers and thunderstorms may produce isolated instances of severe weather this 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.
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
455 PM EDT SUN JUN 24 2018
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0235 PM TSTM WND DMG 2 NNE PARIS 39.03N 77.94W
06/24/2018 CLARKE VA 911 CALL CENTER
TREE DOWN NEAR THE INTERSECTION OF PARIS HEIGHTS LANE
AND BLUE RIDGE MOUNTAIN ROAD.
&&
EVENT NUMBER LWX1800841
JMGPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
506 PM EDT SUN JUN 24 2018
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0414 PM TSTM WND DMG 3 WNW THORNBURG 38.14N 77.57W
06/24/2018 SPOTSYLVANIA VA 911 CALL CENTER
TREE DOWN ON THE 7000 BLOCK OF MORRIS ROAD.
&&
EVENT NUMBER LWX1800842
JMGPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
509 PM EDT SUN JUN 24 2018
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0456 PM MARINE TSTM WIND 5 S SWAN POINT 38.23N 76.95W
06/24/2018 M45 MPH ANZ536 VA BUOY
&&
EVENT NUMBER LWX1800843
LFRPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
511 PM EDT SUN JUN 24 2018
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0418 PM TSTM WND DMG 1 E THORNBURG 38.13N 77.51W
06/24/2018 SPOTSYLVANIA VA 911 CALL CENTER
TREE DOWN ON THE 5000 BLOCK OF MUDD TAVERN ROAD.
&&
EVENT NUMBER LWX1800844
JMGPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
514 PM EDT SUN JUN 24 2018
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0348 PM TSTM WND DMG 2 SSW BELMONT 38.12N 77.89W
06/24/2018 SPOTSYLVANIA VA 911 CALL CENTER
TREE DOWN ON THE 15000 BLOCK OF MONROVIA ROAD.
&&
EVENT NUMBER LWX1800845
JMGPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
522 PM EDT SUN JUN 24 2018
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0230 PM TSTM WND DMG 1 WNW BETHEL 39.03N 78.05W
06/24/2018 CLARKE VA 911 CALL CENTER
HORSE TRAILER BLOWN DOWN A HILL ABOUT 30-40 FEET, MANY
TREES DAMAGED OR DESTROYED, TWO BUILDINGS WITH WALLS
DISLODGED BY 1 TO 2 FEET FROM NORMAL POSITION
&&
EVENT NUMBER LWX1800846
RCMThe Sterling radar (KLWX), 47 km away, was scanning. The volume nearest the first event began at 22:30 UTC.
2 thunderstorm wind. Local standard time, as filed.
A tree was down on the 5000 block of Mussetter Road.
A large tree was down. Roots ripped up a portion of the roadway.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Maryland in 2018Every state in 2018This day in weather historyWarnings in Maryland, 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: 756967, 756968.