Active Weather Alerts
Flash Flood Warning
Issued: 1:17 AM Jul. 17, 2025 – National Weather Service
The National Weather Service in Sterling Virginia has issued a * Flash Flood Warning for... Fairfax County in northern Virginia... Southeastern Fauquier County in northern Virginia... Prince William County in northern Virginia... North Central Stafford County in northern Virginia... The Southeastern City of Manassas Park in northern Virginia... * Until 1230 AM EDT. * At 917 PM EDT, Doppler radar and automated rain gauges indicated thunderstorms producing heavy rain across the warned area. Between 1 and 3 inches of rain have fallen. The expected rainfall rate is 1 to 2 inches in 30 minutes. Additional rainfall amounts of 1 to 2 inches are possible in the warned area. Flash flooding is ongoing or expected to begin shortly. HAZARD...Flash flooding caused by thunderstorms. SOURCE...Radar and automated gauges. IMPACT...Flash flooding of small creeks and streams, urban areas, highways, streets and underpasses as well as other poor drainage and low-lying areas. * Some locations that will experience flash flooding include... Dale City... Lake Ridge... Montclair... Bealeton... Manassas... Manassas Park... Independent Hill... Nokesville... Opal... Catlett... Calverton... Midland... Bristersburg... Aden... Somerville... Casanova... Lois... PRECAUTIONARY/PREPAREDNESS ACTIONS... Turn around, don't drown when encountering flooded roads. Most flood deaths occur in vehicles. Be especially cautious at night when it is harder to recognize the dangers of flooding. && FLASH FLOOD...RADAR AND GAUGE INDICATED; EXPECTED RAINFALL RATE...1-2 INCHES IN 30 MINUTES
Special Marine Warning
Issued: 1:14 AM Jul. 17, 2025 – National Weather Service
The National Weather Service in Sterling Virginia has issued a * Special Marine Warning for... Tidal Potomac from Indian Head to Cobb Island MD... Tidal Potomac from Key Bridge to Indian Head MD... * Until 1000 PM EDT. * At 913 PM EDT, strong thunderstorms were located along a line extending from near Key Bridge to Occoquan Bay to 10 nm northwest of Aquia Creek, moving east at 15 knots. HAZARD...Wind gusts 34 knots or greater. SOURCE...Radar indicated. IMPACT...Boaters in small craft could be thrown overboard by suddenly higher winds and waves capsizing their vessel. * Locations impacted include... Widewater, Leesylvania State Park, Smallwood State Park, National Harbor, Quantico, Fort Washington, Tidal Basin, Reagan National Airport, Gunston Hall, Mason Neck State Park, Woodrow Wilson Bridge, Indian Head, Key Bridge, Occoquan Bay, Fort Hunt, and Alexandria. PRECAUTIONARY/PREPAREDNESS ACTIONS... Move to safe harbor until hazardous weather passes. && HAIL...0.00IN; WIND...>34KTS
Small Craft Advisory
Issued: 10:31 PM Jul. 16, 2025 – National Weather Service
...SMALL CRAFT ADVISORY REMAINS IN EFFECT FROM 10 AM TO 6 PM EDT THURSDAY... * WHAT...Southwest winds around 10 kt with gusts up to 20 kt expected. * WHERE...Tidal Potomac River from Key Bridge to Cobb Island MD, Chesapeake Bay north of Pooles Island MD, Patapsco River including Baltimore Harbor, Chester River to Queenstown MD, and Patuxent River to Broomes Island MD. * WHEN...From 10 AM to 6 PM EDT Thursday. * IMPACTS...Conditions will be hazardous to small craft. PRECAUTIONARY/PREPAREDNESS ACTIONS... Inexperienced mariners, especially those operating smaller vessels, should avoid navigating in hazardous conditions. &&
Flood Watch
Issued: 9:19 PM Jul. 16, 2025 – National Weather Service
...FLOOD WATCH REMAINS IN EFFECT UNTIL MIDNIGHT EDT TONIGHT... * WHAT...Flash flooding caused by excessive rainfall continues to be possible. * WHERE...Washington DC, and portions of Maryland, including the following areas, Anne Arundel, Carroll, Cecil, Central and Southeast Howard, Central and Southeast Montgomery, Frederick MD, Northern Baltimore, Northwest Harford, Northwest Howard, Northwest Montgomery, Prince Georges, Southeast Harford and Southern Baltimore, and Virginia, including the following areas, Albemarle, Arlington/Falls Church/Alexandria, Central and Southeast Prince William/Manassas/Manassas Park, Culpeper, Eastern Loudoun, Fairfax, Greene, Madison, Nelson, Northern Fauquier, Northwest Prince William, Rappahannock, Southern Fauquier and Western Loudoun. * WHEN...Until midnight EDT tonight. * IMPACTS...Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. Flooding may occur in poor drainage and urban areas. * ADDITIONAL DETAILS... - Showers and thunderstorms will move across the area this evening. Storms will be capable of producing very heavy rainfall, with 1 to 3 inches possible in an hour where stationary cells or multiple rounds occur. Localized maximum rainfall of 2 to 4 inches is possible. - Please visit www.weather.gov/safety/flood for flood safety and preparedness information. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. &&
Heat Advisory
Issued: 8:39 PM Jul. 16, 2025 – National Weather Service
...HEAT ADVISORY IN EFFECT FROM 11 AM TO 8 PM EDT THURSDAY... * WHAT...Heat index values around 105 expected. * WHERE...Washington DC, and portions of central, northern, and southern Maryland, and central and northern Virginia. * WHEN...From 11 AM to 8 PM EDT Thursday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Take extra precautions when outside. Wear lightweight and loose fitting clothing. Try to limit strenuous activities to early morning or evening. Take action when you see symptoms of heat exhaustion and heat stroke. &&
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