Heavy rain developed in the morning of August 15th, as a warm front was forced northward into the region, ahead of Hurricane Gert. The heavy rain continued into early afternoon, producing both flooding and flash flooding in the Baltimore metropolitan area.
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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.
Heavy rain developed in the morning of August 15th, as a warm front was forced northward into the region, ahead of Hurricane Gert. The heavy rain continued into early afternoon, producing both flooding and flash flooding in the Baltimore metropolitan area.
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 15, 8:43 AM EST, 2 hours 17 minutes earlier.
Area Forecast Discussion National Weather Service Baltimore MD/Washington DC 943 AM EDT Tue Aug 15 2017 .SYNOPSIS... A series of disturbances will move across the region throughout today bringing a chance of showers or an isolated thunderstorm. High pressure will build into the region tonight through Wednesday night. A cold front will approach from the west late in the week. && .NEAR TERM /UNTIL 6 PM THIS EVENING/... Light to moderate rain will continue to move across the region the remainder of the today. There will be pockets of heavy rain moving across the Virginia Piedmont through Noon with a chance of a rumble of thunder in one or two places. A thunderstorm or two cannot be ruled out this afternoon as we have a few breaks in cloud cover and a disturbance moving along the area. Some clearing in the NW part of the forecast area in the latter stages of the afternoon. Given the cloud cover and fact that Monday was a rare day when the temperatures were cooler than guidance we'll stay on the lower end of guidance. Highs generally around 80. && .SHORT TERM /6 PM THIS EVENING THROUGH THURSDAY/... Tonight through Wednesday night area will be under the influence of high pressure. Lows tonight and Wednesday night in the upper 60s west of I-95, lower 70s east. Highs Wednesday around 90. Thursday morning should be dry. It appears that a warm front will approach the area during the day bringing a chance of showers and thunderstorms to the region during the aftenoon, although the models appear to be slowing down the approach of this system so PoPs may have to be pushed back with later forecast packages. && .LONG TERM /THURSDAY NIGHT THROUGH MONDAY/... Several chances for showers/thunderstorms exist for late this week and into the weekend, although no washout days are expected. We'll likely be sitting in the warm sector of a frontal system Thursday night as the primary low pushes through the Great Lakes and into southern Canada. Thus a mild and muggy night is likely in store with lows in the low to mid 70s. A cold front will progress towards the region on Friday with humid and very warm to hot conditions out ahead of it. This will lead to the development of instability and therefore chances for scattered showers and thunderstorms. High temperatures should peak in the neighborhood of 90F. Uncertainty then exists as to how far south/east the front will make it before stalling out. Model guidance has trended less progressive over the past several cycles and 00z/0815 suites of both the ECMWF/GFS keep the frontal boundary near or over the region. This would allow for continued chances of isolated-scattered showers/thunderstorms, especially as an upper trough traverses overhead. That being said, run to run consistency is still low, so will keep PoPs slight to low chance. Temperatures/humidity values are also dependent on the frontal evolution, but have trended them up. By Monday, both model suites are in good agreement with high pressure building in. && .AVIATION /14Z TUESDAY THROUGH SATURDAY/... Clouds and light to moderate rain moving across the terminals this morning have brought VFR conditions down to IFR and LIFR briefly. We will see this reduction at times through the afternoon. Entire region will go back to VFR conditions this evening and remain that way into Thursday. Predominantly VFR is expected Thursday night through Saturday with potential for brief periods of reductions in isolated to scattered showers/thunderstorms, especially afternoon/evening. && .MARINE... Winds expected to remain below SCA values this afternoon through Thursday. South winds will be on the increase Thursday night and Friday ahead of a frontal system, and Small Craft Advisory conditions are possible. Sub-SCA conditions should then return by Saturday. Isolated to scattered showers and thunderstorms are also possible each day, mainly afternoon/evening. && .LWX WATCHES/WARNINGS/ADVISORIES... DC...None. MD...None. VA...None. WV...None. MARINE...None. && SYNOPSIS...KLW NEAR TERM...KLW SHORT TERM...KLW LONG TERM...MM AVIATION...MM/KLW MARINE...MM/KLW
Hazardous Weather Outlook National Weather Service Baltimore MD/Washington DC 1136 AM EDT Tue Aug 15 2017 ANZ530>543-DCZ001-MDZ011-013-014-016>018-508-VAZ052>057-161545- 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- 1136 AM EDT Tue Aug 15 2017 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 A Flash Flood Warning is in effect until 215pm this afternoon for much of the northern half of the District of Columbia and surrounding suburbs in portions of Maryland and northeast Virginia. A swath of moderate to heavy rainfall moving across the District of Columbia and along the I-95 corridor. Additional warnings or statements may be warranted into the middle of this afternoon. .DAYS TWO THROUGH SEVEN...Wednesday through Monday 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>506-161545- 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- 1136 AM EDT Tue Aug 15 2017 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 A Flash Flood Warning is in effect until 215pm this afternoon for much of the northern half of the District of Columbia and surrounding suburbs in portions of Maryland and northeast Virginia. A swath of moderate to heavy rainfall moving across the District of Columbia and along the I-95 corridor. Additional warnings or statements may be warranted into the middle of this afternoon. .DAYS TWO THROUGH SEVEN...Wednesday through Monday No hazardous weather is expected at this time. .SPOTTER INFORMATION STATEMENT... Spotter Activation is not expected at this time.
The Sterling radar (KLWX), 110 km away, was scanning. The volume nearest the first event began at 16:00 UTC.
5 flash flood, 5 flood. Local standard time, as filed.
The hillside adjacent to Baldwin Mill Road washed out in a landslide, blocking the roadway in the 1800 block.
Water flowing over the roadway near the intersection of Thomas Run Road and Ruffs Mill Road.
Sandy Hook Road flooded at Deer Creek.
Henderson Road flooded at a stream crossing near the 900 block.
Water two feet deep reported near North Point Road and German Hill Road in Dundalk.
Edmonson Avenue flooded near Cooper Branch in the 3200 block.
Multiple vehicles trapped in multiple feet of water on Erdman Avenue under the railroad tracks just west of I-95.
Flooding due to torrential rain was reported near the intersection of North Point Boulevard and Interstate 695.
Flooding on Vale Road near the intersection with North Tollgate Road.
Carrs Mill Road flooded and closed adjacent to Winters Run, between the 1300 and 1600 blocks.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Maryland in 2017Every state in 2017This day in weather historyWarnings in Maryland, August 2017
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: 715684, 715686, 715688, 715689, 715691, 715692, 715694, 715695, 715696, 715700.