Radiational cooling along with high amounts of low-level moisture resulted in areas of dense fog during the early morning hours.
Every event with a place to put it; 6 filed by county or forecast zone are drawn at its center, in a lighter ring. 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.
Radiational cooling along with high amounts of low-level moisture resulted in areas of dense fog during the early morning hours.
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 Sep 19, 11:31 PM EST, 4 minutes earlier.
Area Forecast Discussion National Weather Service Baltimore MD/Washington DC 1231 AM EDT Tue Sep 20 2016 .SYNOPSIS... High pressure will build over the region tonight through Thursday. A dry cold front will move through the area Saturday afternoon bringing fall like weather. && .NEAR TERM /THROUGH TODAY/... Tidal section below updated. Mostly dry conditions expected across the Mid-Atlantic region tonight. Isolated showers are possible overnight as an upper level low moves off the southeast coast. Rainfall amounts will be light. Clearing has occurred across the Appalachians...Potomac Highlands and Shenandoah Valley this evening. Due to recent rain...fog is expected to form overnight. There has been some clearing east of the Blue Ridge as well and some fog has formed across the Central Foothills. This will continue tonight however northeast flow in the low levels will keep a constant moisture feed into the Mid- Atlantic overnight and low clouds are expected to form east of the Blue Ridge mountains as well as portions of the Potomac Highlands overnight into Tuesday morning. The upper level low will continue to rotate over the southeast U.S Tuesday. A stationary front will be along the coast and showers are possible across the Central Foothills and south of Washington DC mainly in the afternoon. Winds will stay out of the northeast with temps reaching around 80 deg. && .SHORT TERM /TONIGHT THROUGH WEDNESDAY NIGHT/... High pressure will gradually build over the mid-Atlc through Thu leading to drying conditions. The only exception is over St. Marys county where showers could persist along weak confluence zone. Model soundings suggest potential for widespread fog Tue and Wed nights as mid- level subsidence builds in and ground remains moist from today's rains. && .LONG TERM /THURSDAY THROUGH MONDAY/... Fairly benign weather pattern late this week and into the weekend as high pressure lingers nearby and precipitation chances remain minimal. Above normal temperatures (with some humidity) forecast through Saturday. Cold front expected this weekend...which will help to lower temperatures and dewpoints as high pressure builds into the area from the north. Limited moisture with frontal boundary looks to keep precip chances rather low. && .AVIATION /06Z TUESDAY THROUGH SATURDAY/... Fog and low stratus expected tonight. VFR conditions will become MVFR/IFR overnight and into Tuesday morning at all terminals. Low confidence at the exact time of MVFR/IFR tonight however it should stay around until 13-15z Tuesday. Fog appears likely at KMRB and KCHO overnight where skies are likely to clear out at some point during the night. Over eastern terminals, low clouds/cigs with no VSBY restrictions appear more likely where mid and high level clouds are expected to be hang on. Potential for more widespread fog Tue and Wed nights. VFR conditions expected Thursday through early this weekend. && .MARINE... NEly flow then through Tuesday generally 10 kt. High pressure builds in from eastern Great Lakes Tuesday and Wednesday with north winds. Winds expected to remain below SCA values Thursday and Friday. && .TIDES/COASTAL FLOODING... No coastal flood headlines as of now. Northeast winds continue on the waters through Tuesday as low pressure remains along the Carolina coast. However, anomalies will stay elevated and near action stages into Wednesday. Water levels will continue to be closely monitored. && .LWX WATCHES/WARNINGS/ADVISORIES... DC...None. MD...None. VA...None. WV...None. MARINE...None. && SYNOPSIS...LFR NEAR TERM...HAS/LFR SHORT TERM...LFR LONG TERM...MSE AVIATION...HAS/MSE/LFR MARINE...HAS/MSE/LFR TIDES/COASTAL FLOODING...BAJ
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 137 PM EDT MON SEP 19 2016 ANZ530>543-DCZ001-MDZ011-013-014-016>018-508-VAZ052>057-201000- 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- 137 PM EDT MON SEP 19 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...THIS AFTERNOON AND 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. MDZ003>006-501>507-VAZ025>031-036>040-050-051-501>508-WVZ050>053- 055-501>506-201000- 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- 137 PM EDT MON SEP 19 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...THIS AFTERNOON AND 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 national radar mosaic for the moment the first event began.
6 dense fog. Local standard time, as filed.
Visibility was reported to be around one-quarter mile at Luray.
Visibility was reported to be around one-quarter mile at Front Royal.
Visibility was estimated to be around one-quarter mile based on observations nearby.
Visibility was reported to be around one-quarter mile at New Market Airport.
Visibility was reported to be around one-quarter mile at New Market Airport.
Visibility was estimated to be around one-quarter mile based on observations nearby.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Virginia in 2016Every state in 2016This day in weather historyWarnings in Virginia, September 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: 659719, 659721, 659722, 659716, 659718, 659723.