5 inches. This resulted in a few road closures.
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.
An area of low pressure moved along the Atlantic seaboard bringing widespread rainfall amounts of 1.5 to 2.5 inches. This resulted in a few road closures.
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 Dec 27, 9:28 PM EST, 9 minutes earlier.
Area Forecast Discussion National Weather Service Baltimore MD/Washington DC 928 PM EST Wed Dec 27 2023 .SYNOPSIS... A coastal low pressure system near the Outer Banks will drift northward towards the Virginia Capes overnight. A lingering upper level low over the Tennessee Valley will keep unsettled weather through the end of the week. && .NEAR TERM /THROUGH THURSDAY/... The radar at 9pm showed a V-shaped band of moderate to heavy rain extending from Northeast Maryland southwest along the Metro corridor of Baltimore to just east of Washington D.C. and across much of the Chesapeake Bay. Hourly rainfall rates have averaged one half to three quarters inch per hour across the core of Northeast Maryland. Total rain amounts in this vary area are one and a quarter to two and a quarter inches, so far, with more expected to accumulate over the next 2 to 4 hours. The rain band will continue to move eastward with patches of drizzle, an occasional shower or two, and/or patchy fog expected behind it and as far back as the Shenandoah Valley. Temperatures will follow a somewhat non-diurnal curve tonight and not decrease until after the front comes through - which may not be until 4/5 AM across the metros. As the low pressure system moves northeast into New England Thursday morning, the day will start out mostly dry. Through the day and especially overnight, the associated ULL will move into the Tennessee Valley. Guidance has continued to trend slightly drier for the Thursday period though a few isolated showers cannot be ruled out. A warmer air mass will push into the region Thursday with highs reaching the mid to upper 50s, perhaps even pushing 60. && .SHORT TERM /THURSDAY NIGHT THROUGH FRIDAY NIGHT/... As the ULL works further east Friday into Friday night over the region, several lobes of vorticity/energy will rotate around the low and interact with the Allegheny Mountains. Colder air arrives in our western zones throughout the day. This will result in a period of snow. There remains some uncertainty wrt where the energy and better forcing is located along with any potential banding as indicated by the higher percentiles in the ensemble suites. While a generaly 1-4" is currently forecast across the Allegheny Front, the 90th Percentile is around 6". Will continue to monitor. The majority of snow would fall overnight Friday. The vast majority of this will fall in an 18-24 hour period, so some headlines are possible as we get closer to the event. The primary upper low then swings through on Friday, pushing a somewhat weak cold front through the region by Friday night. This could result in a few showers once again. However, the primary weather threat will be mountain snow showers in upslope flow. Colder air arrives in our western zones throughout the day. The majority of snow would fall overnight Friday. Initial forecast for snow totals is anywhere between 2 to 4 inches along/west of the Allegheny Front, with some isolated higher amounts possible. The vast majority of this will fall in an 18-24 hour period, so some headlines are possible as we get closer to the event. && .LONG TERM /SATURDAY THROUGH WEDNESDAY/... To start the weekend, low pressure will continue exiting the area and will be located south of Nova Scotia. Tight pressure gradients will lead to breezy westerly winds on Saturday with gusts up to 25 mph possible over higher elevations. Cold temperatures will filter in behind the departing low leading to high temperatures topping out in the mid to upper 40s for most. Those along the Alleghenies will stay in the low 30s with snow showers continuing throughout the day. Slight chance of precipitation along the I-95 corridor will dry out by Saturday night as the low further moves away. Conditions dry out east of the mountains for Sunday with a chance of snow showers continuing along and west of the Alleghenies through New Year's Day. Conditions dry out areawide as high pressure builds in from the west on Tuesday into Wednesday. Temperatures each day will be in the 40s for most with higher elevations staying in the 30s. Overnight low temperatures will drop into the 20s to low 30s. && .AVIATION /02Z THURSDAY THROUGH MONDAY/... MTN and BWI will continue to endure moderate to heavy rainfall through the next hour or two before tapering and coming to an end overnight. At these terminals, as well as the others, visibility and ceilings will be primarily IFR or LIFR overnight due to lingering showers and drizzle, as well as patchy dense fog. As dry air pushes into the region Thursday, we should see some improvement after around 12z or so. Could still see some reductions in CIGs/VSBYs with a lingering upper low to our west Thursday and Friday, but should be much better than previous days. Sub-VFR conditions are possible at eastern terminals on Saturday with lingering precipitation. Gusty westerly winds are possible as well with gusts up to 25mph possible. VFR conditions return for Sunday with winds diminishing areawide. && .MARINE... Light to moderate rainfall and patchy dense fog overnight could hinder visibility to boaters. Low pressure near the Outer Banks will lift northeast overnight into early Thursday before pushing offshore Thursday afternoon. Sub-SCA level northwesterly winds are expected during the day Thursday and Friday. Winds increase Friday as the pressure gradient tightens. This could result in SCA gusts in northwesterly flow Friday into Friday night. Gusty westerly winds on Saturday will lead to SCA conditions across all waters. Winds diminish to sub-SCA criteria on Sunday and will shift to southwesterly. && .TIDES/COASTAL FLOODING... Sensitive locations like SW Waterfront are still in Minor Stage of Coastal Flooding but should soon end as north to northwest winds develop overnight with low pressure pulling north then to the northeast. && .LWX WATCHES/WARNINGS/ADVISORIES... DC...Coastal Flood Advisory until 11 PM EST this evening for DCZ001. MD...None. VA...None. WV...None. MARINE...None. && SYNOPSIS...CJL NEAR TERM...KLW/CPB SHORT TERM...CPB LONG TERM...AVS AVIATION...AVS/KLW MARINE...AVS/KLW TIDES/COASTAL FLOODING...KLW
Hazardous Weather Outlook National Weather Service Baltimore MD/Washington DC 414 PM EST Wed Dec 27 2023 ANZ530>543-DCZ001-MDZ008-011-013-014-016>018-504-506-508- VAZ053>057-527-281000- 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-Cecil-Southern Baltimore- Prince Georges-Anne Arundel-Charles-St. Marys-Calvert- Central and Southeast Montgomery-Central and Southeast Howard- Southeast Harford-Fairfax-Arlington/Falls Church/Alexandria- Stafford-Spotsylvania-King George- Central and Southeast Prince William/Manassas/Manassas Park- 414 PM EST Wed Dec 27 2023 This Hazardous Weather Outlook is for the Maryland portion of the Chesapeake Bay, Tidal Potomac River, and I-95 corridor through central Maryland, northern Virginia, and District of Columbia. .DAY ONE...Tonight Locally heavy rain could lead to isolated instances of flooding tonight. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday No hazardous weather is expected at this time. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time. MDZ003>006-503-505-507-VAZ025>031-036>040-050-051-501-502-505>508- 526-WVZ050>053-055-281000- Washington-Frederick MD-Carroll-Northern Baltimore- Northwest Montgomery-Northwest Howard-Northwest Harford-Augusta- Rockingham-Shenandoah-Frederick VA-Page-Warren-Clarke-Nelson- Albemarle-Greene-Madison-Rappahannock-Orange-Culpeper- Northern Fauquier-Southern Fauquier-Western Loudoun- Eastern Loudoun-Northern Virginia Blue Ridge- Central Virginia Blue Ridge-Northwest Prince William-Hampshire- Morgan-Berkeley-Jefferson-Hardy- 414 PM EST Wed Dec 27 2023 This Hazardous Weather Outlook is for portions of eastern West Virginia, northern and central Virginia, and central and western Maryland. .DAY ONE...Tonight Locally heavy rain could lead to isolated instances of flooding tonight along and east of the Blue Ridge. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday No hazardous weather is expected at this time. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time. MDZ001-501-502-VAZ503-504-WVZ501>506-281000- Garrett-Extreme Western Allegany-Central and Eastern Allegany- Western Highland-Eastern Highland-Western Grant-Eastern Grant- Western Mineral-Eastern Mineral-Western Pendleton- Eastern Pendleton- 414 PM EST Wed Dec 27 2023 This Hazardous Weather Outlook is for the Allegheny Front counties in western Maryland, eastern West Virginia, and Highland County Virginia. .DAY ONE...Tonight No hazardous weather is expected at this time. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday There is a slight winter storm threat Friday through Friday night for locations along and west of the Allegheny Front. If the threat materializes, it may lead to travel disruptions. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time.
The national radar mosaic for the moment the first event began.
4 flood. Local standard time, as filed.
Numerous roads reported closed due to high water in the Elkton and Chesapeake City areas.
Numerous roads reported closed due to high water in the Conowingo area.
Vehicle stuck in floodwaters on Winters Run Road. Road has also been closed due to high water.
The stream gauge on the Western Branch near Upper Marlboro reached a gauge height of 12 feet. At 12 feet, large parts of Marlboro Race Track Road is flooded with a few feet of water between Marlboro Pike and the Community Center. A water rescue was reported on this road due to a stalled car in flood waters.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Maryland in 2023Every state in 2023This day in weather historyWarnings in Maryland, December 2023
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: 1145939, 1145940, 1145942, 1145944.