High pressure over the Atlantic ushered in hot and humid conditions. Thunderstorms developed due to a surface trough and an upper-level disturbance, and there was enough instability for a few thunderstorms to become severe.
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.
High pressure over the Atlantic ushered in hot and humid conditions. Thunderstorms developed due to a surface trough and an upper-level disturbance, and there was enough instability for a few thunderstorms to become 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, 1:57 PM EST, 2 hours 19 minutes earlier.
Area Forecast Discussion National Weather Service Baltimore MD/Washington DC 257 PM EDT Mon Aug 1 2016 .SYNOPSIS...Weak low pressure will gradually move offshore today and tonight as a front drifts southward. High pressure will build in from the north during the middle of the week, then move offshore late in the week. A cold front is expected to cross the area Saturday. && .NEAR TERM /THROUGH TUESDAY NIGHT/...Sct showers and t-storms expected until evening as a cdfnt sags slowly swd. Storm motion will be relatively slow 10-15 kt which may pose an isolated flash flooding threat but mid-level dry air will likely reduce precip efficiency. Perhaps, an isolated wind damage threat, but most storms should remain sub-severe. Clearing expected overnight which may lead to patchy fog especially with moist soils from recent rainfall. Drier air will continue to filter in Tue but not dry enough to completely suppress shower development. A convergence line is expected to set up along the Chesapeake Bay which may trigger a few showers or t-storms. && .SHORT TERM /WEDNESDAY THROUGH WEDNESDAY NIGHT/...High pressure builds further southward Wed suppressing shower development and providing fair weather conditions. && .LONG TERM /THURSDAY THROUGH MONDAY/... Surface high moves away from our region allowing for southerly return flow to develop, so could see some showers and thunderstorms, mainly terrain induced. This continues into Friday and with a cold front approaching from the northwest, showers and thunderstorms are again possible. The front moves across on Saturday and slowly pushes south into the night, which could bring more widespread precipitation to our CWA. Drier conditions expected behind the front with possible showers and thunderstorms to our south. High temperatures will be in the upper 80s and low 90s. && .AVIATION /19Z MONDAY THROUGH SATURDAY/...T-storms likely at KBWI and KMTN until 00Z with brief MVFR conditions. Patchy MVFR fog overnight. Sct showers again possible tomorrow afternoon. Mainly VFR conditions expected for Thursday through Saturday, with some showers and thunderstorms possible, bringing periods of sub-VFR conditions. && .MARINE...Sct showers and t-storms through mid evening and again Tue and Wed. Possible SCA conditions Wed over the lower portions of the MD Chesapeake Bay. Sub-SCA conditions expected as winds will be below SCA criteria. Showers and thunderstorms possible over the waters during this period could bring gusty winds. && .LWX WATCHES/WARNINGS/ADVISORIES... DC...None. MD...None. VA...None. WV...None. MARINE...None. && SYNOPSIS...LFR NEAR TERM...LFR SHORT TERM...LFR LONG TERM...IMR AVIATION...IMR/LFR MARINE...IMR/LFR
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 459 PM EDT MON AUG 1 2016 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- 459 PM EDT MON AUG 1 2016 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 ISOLATED THUNDERSTORMS ARE EXPECTED THROUGH THIS EVENING. A COUPLE THUNDERSTORMS MAY BE CAPABLE OF PRODUCING LOCALLY DAMAGING WIND GUSTS AND HEAVY RAINFALL. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY 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>506-021000- 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- 459 PM EDT MON AUG 1 2016 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 NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.
The Sterling radar (KLWX), 89 km away, was scanning. The volume nearest the first event began at 21:17 UTC.
4 thunderstorm wind. Local standard time, as filed.
Large tree down near the intersection of Shore Acres Road and Bennett Road.
A wind gust of 63 mph was reported.
A tree fell on a house.
Large tree was down onto the road near the intersection of Queen Anne Bridge Road and West Central Avenue.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Maryland in 2016Every state in 2016This day in weather historyWarnings in Maryland, August 2016
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: 648502, 648506, 648503, 648504.