Warm, moist air aloft overrunning cooler surface air combined with lingering low level moisture to produce low clouds and widespread dense fog across portions of the region.
Every event with a place to put it; 13 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.
Warm, moist air aloft overrunning cooler surface air combined with lingering low level moisture to produce low clouds and widespread dense fog across portions of the region.
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 May 2, 3:00 AM EST, 30 minutes earlier.
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</html>Hazardous Weather Outlook National Weather Service Baltimore MD/Washington DC 934 PM EDT Wed May 1 2019 ANZ530>543-DCZ001-MDZ011-013-014-016>018-508-VAZ052>057-030145- 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- 934 PM EDT Wed May 1 2019 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 No hazardous weather is expected at this time. .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>006-501>507-VAZ025>031-036>040-050-051-501>508-WVZ050>053- 055-501>506-030145- 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- 934 PM EDT Wed May 1 2019 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...Thursday through Tuesday 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.
13 dense fog. Local standard time, as filed.
Observations from around the area indicated that visibility was reduced to a quarter mile or less in dense fog.
Observations from around the area indicated that visibility was reduced to a quarter mile or less in dense fog.
Observations from around the area indicated that visibility was reduced to a quarter mile or less in dense fog.
Observations from around the area indicated that visibility was reduced to a quarter mile or less in dense fog.
Observations from around the area indicated that visibility was reduced to a quarter mile or less in dense fog.
Observations from around the area indicated that visibility was reduced to a quarter mile or less in dense fog.
Observations from around the area indicated that visibility was reduced to a quarter mile or less in dense fog.
Observations from around the area indicated that visibility was reduced to a quarter mile or less in dense fog.
Observations from around the area indicated that visibility was reduced to a quarter mile or less in dense fog.
Observations from around the area indicated that visibility was reduced to a quarter mile or less in dense fog.
Observations from around the area indicated that visibility was reduced to a quarter mile or less in dense fog.
Observations from around the area indicated that visibility was reduced to a quarter mile or less in dense fog.
Observations from around the area indicated that visibility was reduced to a quarter mile or less in dense fog.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Maryland in 2019Every state in 2019This day in weather historyWarnings in Maryland, May 2019
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 2026-10-01. Each event’s entry at NCEI: 825836, 825837, 825838, 825839, 825840, 825841, 825842, 825843, 825844, 825845, 825846, 825847, 825848.