An upper level trough and its associated energy approached and crossed the region during the late afternoon and evening hours of August 1st. At the surface, a frontal boundary remained stalled across central Virginia and into eastern Maryland.
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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 upper level trough and its associated energy approached and crossed the region during the late afternoon and evening hours of August 1st. At the surface, a frontal boundary remained stalled across central Virginia and into eastern Maryland. Temperatures in the 80s to around 90F combined with dew points in the 60s to near 70F and led to the development of moderate instability across the area during the afternoon hours.|Scattered showers and thunderstorms then formed in the afternoon and evening, and some of them became locally severe.
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 1, 1:52 PM EST, 2 hours 28 minutes earlier.
Area Forecast Discussion National Weather Service Baltimore MD/Washington DC 252 PM EDT Thu Aug 1 2019 .SYNOPSIS... A stalled front and upper level trough will remain in our vicinity for the remainder of the week and into the weekend. The front may push southward Sunday and then lift back northward early next week. && .NEAR TERM /THROUGH TONIGHT/... Mostly sunny skies are observed across the majority of the region this afternoon. Weak default shortwave upper level ridge is currently crossing the region, however a shortwave trough and associated upper level energy will approach the region from West Virginia this evening. At the surface, a frontal boundary will remain stalled across central VA over to eastern Maryland. Temperatures have risen through the 80s to around 90F and that combined with dew points in the 60s to near 70F has led to the development of between 1000-2000 J/KG MLCAPE, with a current maximum in excess of 2000 J/KG over the Baltimore metro area. Thus expecting another day of isolated to scattered showers/thunderstorms across the region. Convection likely to be focused in two areas, one across portions of central/western VA and eastern WV near the Potomac Highlands/Shenandoah Valley this afternoon and evening near the frontal boundary and approaching shortwave trough. A secondary area of focus has also taken shape across central/northeastern Maryland where an area of convergence has developed due to northeasterly flow and the bay breeze interaction, in combination with the higher CAPE values mentioned above thanks to higher dew points from marine influence. While organized severe/flood activity is not anticipated, an isolated pulse severe storm in addition to an isolated incident of flooding is possible due to higher instability and slow flow aloft. Diurnal convection will generally wane this evening, however, with the shortwave trough moving into the area, additional shower/thunderstorm development is possible. There is currently uncertainty regarding the extent and intensity of the development overnight and into the early morning hours, but a general ensemble of guidance depicts increasing chances of showers/thunderstorms towards morning. The threat for isolated flooding is possible with these storms as well. Otherwise, patchy fog possible, with lows in the 60s to low 70s. && .SHORT TERM /FRIDAY THROUGH SATURDAY NIGHT/... The upper level shortwave will be overhead Friday morning and will slowly push eastward Friday afternoon. As mentioned above, a period of morning showers/thunderstorms with heavy rain is possible, but coverage/intensity remains uncertain at this time. Additional shower/thunderstorm development is possible Friday afternoon as instability increases. An isolated pulse severe and flooding incident is possible with this activity as well. Highs in the low 80s. Shower and thunderstorm activity will wane Friday night. Patchy fog will be possible again. Lows in the 60s to around 70F. Upper level forcing will weaken Saturday although a stalled front will still be lingering near the region, so scattered showers and thunderstorms will continue to be possible, although coverage should be less than previous days. Highs in the mid 80s. Lows Saturday night in the 60s to around 70F. && .LONG TERM /SUNDAY THROUGH THURSDAY/... The long-term pattern looks very stagnant, with a mid-upper level trough settled along the Appalachains, and a mid-upper level ridge stuck over the western CONUS. Not seeing any strong surface features progged to push through the area through the middle of next week. However, given the warm and moist air mass in place thanks to a consistent southwesterly flow into the region, showers and thunderstorms will be possible each day. The coverage of storms will be heavily dependent on the placement of the trough axis, as well as any mesoscale features that models can't resolve several days out. So, will maintain daily chances for showers and storms in the afternoon/evening for most of the area throughout the long term period. && .AVIATION /19Z THURSDAY THROUGH TUESDAY/... Mainly VFR at the terminals expected through Saturday night, with intervals of reduced cigs/vis in any showers/storms, and after any rain that falls due to fog development. Highest chances of showers/storms are this afternoon/evening, late tonight into Friday, and Saturday afternoon, but they could occur at nearly any time. Generally expecting VFR conditions across the region through the long-term period. However, with daily chances for showers and thunderstorms in the afternoon/evening, some flight restrictions are possible at all terminals with any passing showers or storms. && .MARINE... Sub-SCA winds through Saturday night as a front remains over the region. Main concern will be thunderstorms, primarily in the afternoon and evening hours, which could produce gusty winds and require special marine warnings. Winds will generally remain below SCA criteria across the region throughout the long term period. However, there will be a chance for showers and thunderstorms each afternoon/evening Sunday through Wednesday, so if any of these make it to the waters, could see some brief gusty winds. && .LWX WATCHES/WARNINGS/ADVISORIES... DC...None. MD...None. VA...None. WV...None. MARINE...None. && SYNOPSIS...MM NEAR TERM...MM SHORT TERM...MM LONG TERM...CJL AVIATION...MM/CJL MARINE...MM/CJL
Hazardous Weather Outlook National Weather Service Baltimore MD/Washington DC 214 PM EDT Thu Aug 1 2019 ANZ530>543-DCZ001-MDZ011-013-014-016>018-508-VAZ052>057-021000- 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- 214 PM EDT Thu Aug 1 2019 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...This Afternoon and Tonight Thunderstorms producing heavy rainfall are possible this afternoon and into tonight which may result in isolated instances of flooding. An isolated severe thunderstorm with damaging winds and large hail is also possible, mainly across central and northeastern Maryland this afternoon and evening. .DAYS TWO THROUGH SEVEN...Friday through Wednesday Thunderstorms may produce heavy rainfall which may result in isolated instances of flooding Friday and Saturday. The highest risk is south of the US 50 corridor. .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>506-021000- 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- 214 PM EDT Thu Aug 1 2019 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...This Afternoon and Tonight Thunderstorms producing heavy rainfall are possible this afternoon and into tonight which may result in isolated instances of flooding. The highest risk is south of the US 50 corridor. An isolated severe thunderstorm with damaging winds and large hail is also possible, mainly across the Potomac Highlands and Shenandoah Valley this afternoon and evening. .DAYS TWO THROUGH SEVEN...Friday through Wednesday Thunderstorms may produce heavy rainfall which may result in isolated instances of flooding Friday and Saturday. The highest risk is south of the US 50 corridor. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time.
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
303 PM EDT THU AUG 01 2019
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0301 PM HAIL 2 E SEVERN 39.14N 76.66W
08/01/2019 M1.00 INCH ANNE ARUNDEL MD TRAINED SPOTTER
&&
EVENT NUMBER LWX1905549
JMGPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
332 PM EDT THU AUG 01 2019
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0245 PM HAIL 1 ENE FERNDALE 39.19N 76.62W
08/01/2019 E1.75 INCH ANNE ARUNDEL MD PUBLIC
HAIL UP TO GOLF BALL SIZE OFF FURNACE BRANCH ROAD IN
GLEN BURNIE.
&&
EVENT NUMBER LWX1905550
DHPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
348 PM EDT THU AUG 01 2019
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0243 PM TSTM WND DMG 1 S GLEN BURNIE 39.16N 76.60W
08/01/2019 ANNE ARUNDEL MD LAW ENFORCEMENT
TREE DOWN ONTO HOUSE IN THE 100 BLOCK OF RAPLH ROAD.
&&
EVENT NUMBER LWX1905551
DHPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
435 PM EDT THU AUG 01 2019
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0345 PM LIGHTNING 1 NNE RIVA 38.95N 76.59W
08/01/2019 ANNE ARUNDEL MD LAW ENFORCEMENT
LIGHTNING STRUCK A HOUSE CAUSING A FIRE IN THE 3000
BLOCK OF PIKE DRIVE.
&&
EVENT NUMBER LWX1905552
DHPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
453 PM EDT THU AUG 01 2019
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0256 PM TSTM WND DMG 1 NNW ODENTON 39.08N 76.70W
08/01/2019 ANNE ARUNDEL MD PUBLIC
TREE DOWN ON A CAR PARTIALLY BLOCKING RITA DRIVE.
&&
EVENT NUMBER LWX1905553
DHPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
516 PM EDT THU AUG 01 2019
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0415 PM TSTM WND DMG 4 NE SCARBORO 39.69N 76.24W
08/01/2019 HARFORD MD 911 CALL CENTER
WIRES DOWN NEAR THE INTERSECTION OF PADDRICK ROAD AND
HUNEKE LANE.
0425 PM TSTM WND DMG 2 N HARFORD 39.52N 76.27W
08/01/2019 HARFORD MD 911 CALL CENTER
TREE DOWN NEAR THE INTERSECTION OF MD-136 CALVARY ROAD
AND SCHUCKS ROAD.
0449 PM TSTM WND DMG 2 NNW CHURCHVILLE 39.60N 76.26W
08/01/2019 HARFORD MD 911 CALL CENTER
TREE DOWN IN THE 700 BLOCK OF MD-136 PRIESTFORD ROAD.
&&
EVENT NUMBER LWX1905554
EVENT NUMBER LWX1905555
EVENT NUMBER LWX1905556
DHThe Sterling radar (KLWX), 164 km away, was scanning. The volume nearest the first event began at 21:21 UTC.
9 thunderstorm wind, 3 hail. Local standard time, as filed.
Numerous large tree limbs were blown down blocking roads in Staunton.
Quarter-sized hail (1.0) was reported on Barterbrook Road.
Multiple trees and wires were blown down in the Stuarts Draft area.
Hail up to the size of quarters (1.0) was reported in Charlottesville.
A tree was blown down near the intersection of Independence Road and Daffodil Lane.
Trees were blown down near the intersection of VA-650 Independence Road and Magnolia Drive.
Two large trees were blown down near the intersection of VA-612 Monrovia Road and Brick Church Road.
Trees were blown down near the intersection of VA-669 Marquis Road and VA-629 Lahore Road.
A large tree, 3 feet in diameter, was blown down across the 19400 block of Lahore Road.
A tree was blown down on Ivy Lane near Morgantown Road.
A tree was blown down on Richmond Road near Peter Jefferson Parkway.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Virginia in 2019Every state in 2019This day in weather historyWarnings in Virginia, August 2019
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: 849342, 849339, 849340, 849343, 849341, 849345, 849346, 849350, 849347, 849348, 849344, 849349.