Since Friday, numerous locations along the tidal Potomac River and Chesapeake Bay have endured coastal flooding, due to the departure of Tropical Storm Melissa and the coming hunter’s full moon.
For example, water lapped up over Ohio Drive in the District, flooded streets in Old Town and, according to the Baltimore Sun, covered the brick promenade at the Inner Harbor. In Annapolis, floodwaters disrupted the U.S. Sailboat Show, and some roads were closed.
Tidal flooding in Annapolis today was nuts! This was about 45 minutes after the evening high tide. Walking by what’s usually the main entrance to the United States Sailboat Show. pic.twitter.com/cMpNGhiLQ4
— Rachel P (@aushutterbug) October 13, 2019
And the flood threat isn’t yet over.
Coastal flood advisories and warnings first posted Friday remain in effect through Sunday. High water, about two feet above normal, is a particular concern at high tide. Here are upcoming high tides at select locations:
- Old Town Alexandria: 8:56 a.m. Sunday and 9:12 p.m. Sunday
- District of Columbia shoreline: 8:38 a.m. Sunday and 8:54 p.m. Sunday
- Annapolis: 6:05 p.m. Sunday
The high water along the tidal Potomac and Chesapeake Bay is partly in response to departing Tropical Storm Melissa. When Melissa meandered close to coastal New England on Wednesday and Thursday, winds from the north on its backside pushed water in the Potomac River and Chesapeake Bay south, away from Washington and Baltimore. But since the storm has retreated to the east and those winds have relaxed, the water (previously displaced) is sloshing back up the river and bay.
Making matters worse, the moon is nearing its full phase, which it reaches Sunday, elevating tidal levels. This month’s full moon, called the hunter’s moon, is officially full at 5:07 p.m. eastern Sunday.
But it’s not just the offshore storm and the moon contributing to these anomalous tides. The frequency of high-tide flooding in the Mid-Atlantic has increased dramatically in recent decades due to sea level rise.
A 2018 report from the National Oceanic and Atmospheric Administration showed that in 15 years, the incidence of high-tide flooding in the Mid-Atlantic doubled from an average of three days per year in 2000 to six in 2015.
Given sea level rise projections, high-tide flooding could occur every other day by the end of the century, the NOAA report said.
Below are pictures of some of the flooding.
Photos
Potomac
LFlooding in Old Town Alexandria last night... @capitalweather @KevinMyattWx @wattsupbrent pic.twitter.com/4pI2KF0syd
— Cara Ellen Modisett (@CaraModisett) October 14, 2019
Tidal flooding in Old Town @capitalweather pic.twitter.com/dtdgvevHCg
— Gregory Zitelli (@gregory_zitelli) October 13, 2019
Scenes from flooding in Old Town Alexandria pic.twitter.com/OqKo2hhohU
— Darcy Spencer (@darcyspencer) October 13, 2019
Old town at 7:13pm. Front left is waterfront park and right is old dominion boat club pic.twitter.com/S18WuI0ira
— Larry Hsia (@FunBobby2000) October 13, 2019
Another day another #flood in @AlexandriaVA. #Alexandria #VA pic.twitter.com/2B0HSkZzrp
— Michelle Goldchain (@goldchainam) October 12, 2019
Drought? What drought? @capitalweather pic.twitter.com/OoI4Q5HwMT
— Sadie Dingfelder (@SadieDing) October 12, 2019
Chesapeake Bay
Never seen anything like this in person. No cars allowed in the downtown area pic.twitter.com/b7vynZTTEP
— Ryan Stauffer (@rms5539) October 12, 2019
Flooding caused an early closure of the United Stated Sailboat Show today! #annapolisboatshows #USsailboatshow #annapolissailboatshow #flooding #annapolis pic.twitter.com/2Vxtn01c9g
— molly riley (@mollyriley) October 13, 2019
Annapolis. No credit needed. pic.twitter.com/820us5azRZ
— Dave B. (@Baller21146) October 13, 2019
Wye Island Landing, Eastern Shore this afternoon. https://t.co/qRhynuZs55 pic.twitter.com/4AGZNq0ddw
— Mark B (@Maro2Bear) October 12, 2019
@capitalweather check out #HighTide #CoastalFlooding in #Oxford #MD #EasternShore a short time ago. This was the worst so far since Friday. #SubtropicalStormMelissa #FullMoon pic.twitter.com/UYeKG3GddZ
— Elaine Reyes (@ElaineReyesTV) October 12, 2019
Annapolis-adjacent? This was the boat ramp at Wye Landing around 3:30 today. Knee-high water throughout the parking lot. The people on the dock were wondering how they were going to get their boat out. pic.twitter.com/tyiHcVLfQL
— NanksH (@NanksH) October 13, 2019