Active Weather Alerts
Severe Thunderstorm Watch
Issued: 9:51 PM Jul. 31, 2025 – National Weather Service
SEVERE THUNDERSTORM WATCH 562 REMAINS VALID UNTIL 8 PM EDT THIS EVENING FOR THE FOLLOWING AREAS THE DISTRICT OF COLUMBIA IN MARYLAND THIS WATCH INCLUDES 13 COUNTIES IN CENTRAL MARYLAND ANNE ARUNDEL HOWARD MONTGOMERY PRINCE GEORGES IN NORTH CENTRAL MARYLAND CARROLL FREDERICK IN NORTHEAST MARYLAND CECIL IN NORTHERN MARYLAND BALTIMORE BALTIMORE CITY HARFORD IN SOUTHERN MARYLAND CALVERT CHARLES ST. MARYS IN VIRGINIA THIS WATCH INCLUDES 13 COUNTIES IN CENTRAL VIRGINIA CITY OF FREDERICKSBURG KING GEORGE IN NORTHERN VIRGINIA ARLINGTON CITY OF ALEXANDRIA CITY OF FAIRFAX CITY OF FALLS CHURCH CITY OF MANASSAS CITY OF MANASSAS PARK FAIRFAX FAUQUIER LOUDOUN PRINCE WILLIAM STAFFORD THIS INCLUDES THE CITIES OF ABERDEEN, ALEXANDRIA, ANNAPOLIS, ARLINGTON, ARNOLD, ASPEN HILL, BALLENGER CREEK, BALTIMORE, BEL AIR, BETHESDA, BOWIE, CALIFORNIA, CAMP SPRINGS, CATONSVILLE, CHANTILLY, CHESAPEAKE BEACH, CLINTON, COLLEGE PARK, COLUMBIA, DAHLGREN, DUNDALK, DUNKIRK, EDGEWOOD, ELDERSBURG, ELKTON, ELLICOTT CITY, ESSEX, FAIRFAX, FALLS CHURCH, FALLSTON, FALMOUTH, FREDERICK, FREDERICKSBURG, GAITHERSBURG, GERMANTOWN, GLEN BURNIE, GREENBELT, HAVRE DE GRACE, HERNDON, HUNTINGTOWN, JOPPATOWNE, LAUREL, LEESBURG, LEXINGTON PARK, LUSBY, MANASSAS, MANASSAS PARK, MCLEAN, NORTH BEACH, ODENTON, PARKVILLE, PIKESVILLE, POTOMAC, PRINCE FREDERICK, RANDALLSTOWN, RESTON, ROCKVILLE, SEVERN, SEVERNA PARK, SILVER SPRING, SOUTH GATE, ST. CHARLES, STERLING, SUITLAND-SILVER HILL, TOWSON, WALDORF, WARRENTON, WASHINGTON, WESTMINSTER, AND WOODBRIDGE.
Severe Thunderstorm Watch
Issued: 9:51 PM Jul. 31, 2025 – National Weather Service
SEVERE THUNDERSTORM WATCH 562 REMAINS VALID UNTIL 8 PM EDT THIS EVENING FOR THE FOLLOWING AREAS THIS WATCH INCLUDES THE FOLLOWING ADJACENT COASTAL WATERS 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
Special Marine Warning
Issued: 9:11 PM Jul. 31, 2025 – National Weather Service
The National Weather Service in Sterling Virginia has issued a * Special Marine Warning for... Chesapeake Bay from Pooles Island to Sandy Point MD... Chester River to Queenstown MD... Patapsco River including Baltimore Harbor... * Until 615 PM EDT. * At 511 PM EDT, a strong thunderstorm was located 8 nm west of Back River, moving southeast at 20 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... Fort Smallwood State Park, Bodkin Point, North Point State Park, and Sevenfoot Knoll. PRECAUTIONARY/PREPAREDNESS ACTIONS... Move to safe harbor until hazardous weather passes. && HAIL...0.00IN; WIND...>34KTS
Flash Flood Warning
Issued: 8:35 PM Jul. 31, 2025 – National Weather Service
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 730 PM EDT THIS EVENING FOR NORTHERN HOWARD AND NORTH CENTRAL MONTGOMERY COUNTIES IN CENTRAL MARYLAND, SOUTHEASTERN CARROLL AND SOUTHEASTERN FREDERICK COUNTIES IN NORTH CENTRAL MARYLAND, SOUTHWESTERN BALTIMORE COUNTY IN NORTHERN MARYLAND AND BALTIMORE CITY IN NORTHERN MARYLAND... At 435 PM EDT, Doppler radar and automated rain gauges indicated thunderstorms producing heavy rain across the warned area. Between 1 and 2 inches of rain have fallen. The expected rainfall rate is 2 to 4 inches in 1 hour. Additional rainfall amounts of 2 to 4 inches are possible in the warned area. Flash flooding is ongoing or expected to begin shortly. HAZARD...Life threatening flash flooding. Thunderstorms producing flash flooding. SOURCE...Radar and automated gauges. IMPACT...Life threatening flash flooding of creeks and streams, urban areas, highways, streets and underpasses. Some locations that will experience flash flooding include... Baltimore... Pikesville... Damascus... Ellicott City... Towson... Woodlawn... Randallstown... Parkville... Owings Mills... Eldersburg... Carney... Milford Mill... Lochearn... Mays Chapel... Timonium... White Marsh... Mount Airy... Hampton... Sykesville... Oakland... PRECAUTIONARY/PREPAREDNESS ACTIONS... Turn around, don't drown when encountering flooded roads. Most flood deaths occur in vehicles. Be aware of your surroundings and do not drive on flooded roads. In hilly terrain there are hundreds of low water crossings which are potentially dangerous in heavy rain. Do not attempt to cross flooded roads. Find an alternate route. && FLASH FLOOD...RADAR AND GAUGE INDICATED; FLASH FLOOD DAMAGE THREAT...CONSIDERABLE; EXPECTED RAINFALL RATE...2-4 INCHES IN 1 HOUR
Flash Flood Warning
Issued: 8:23 PM Jul. 31, 2025 – National Weather Service
The National Weather Service in Sterling Virginia has issued a * Flash Flood Warning for... East Central Baltimore County in northern Maryland... Southwestern Harford County in northern Maryland... * Until 730 PM EDT. * At 423 PM EDT, local law enforcement reported thunderstorms producing heavy rain across the warned area. Between 3 and 5 inches of rain have fallen. The expected rainfall rate is 1 to 2 inches in 1 hour. Additional rainfall amounts up to 2 inches are possible in the warned area. Flash flooding is already occurring. HAZARD...Life threatening flash flooding. Thunderstorms producing flash flooding. SOURCE...Law enforcement reported. IMPACT...Life threatening flash flooding of creeks and streams, urban areas, highways, streets and underpasses. * Some locations that will experience flash flooding include... Bel Air South... Carney... Perry Hall... Rossville... White Marsh... Fallston... Kingsville... Pleasant Hills... Edgewood... Joppatowne... Bradshaw... Upper Falls... Gunpowder... Joppa... Fork... Magnolia... Benson... Nottingham... Baldwin... Abingdon... This includes the following Flood Prone Roads... Philadelphia Road at Gunpowder Falls, Bel Air Road at Little Gunpowder Falls and Route 7 at Hall Street. There are numerous roads closed in the Joppatowne and Gunpowder area due to earlier rainfall, and likely will have more flooding due to additional heavy rain in the next two hours. Honeygo Run and Whitemarsh Run could see rapid rises with additional rainfall. PRECAUTIONARY/PREPAREDNESS ACTIONS... Turn around, don't drown when encountering flooded roads. Most flood deaths occur in vehicles. Be aware of your surroundings and do not drive on flooded roads. && FLASH FLOOD...OBSERVED; FLASH FLOOD DAMAGE THREAT...CONSIDERABLE; EXPECTED RAINFALL RATE...1-2 INCHES IN 1 HOUR
Flash Flood Warning
Issued: 8:00 PM Jul. 31, 2025 – National Weather Service
The National Weather Service in Sterling Virginia has issued a * Flash Flood Warning for... West Central Baltimore County in northern Maryland... * Until 700 PM EDT. * At 400 PM EDT, Doppler radar and automated rain gauges indicated thunderstorms producing heavy rain across the warned area. Between 1.5 and 2.5 inches of rain have fallen. The expected rainfall rate is 2 to 3 inches in 1 hour. 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... Cockeysville... Owings Mills... Eldersburg... Reisterstown... Mays Chapel... Timonium... Lutherville-Timonium... Garrison... Butler... Glyndon... Boring... Sparks... Hunt Valley... Glencoe... Upperco... Phoenix... Monkton... This includes the following Flood Prone Roads... Beaver Dam Road at Goodwin Run, Reisterstown Road at Gwynns Falls near Groff Lane, Gwynnbrook Aveue at Gwynns Falls, York Road at Beaverdam Run near Beaver Run Lane, Beaver Dam Road at Beaverdam Run near Cockeysville, Phoenix Road at Gunpowder Falls near Carroll Road, Lower Glencoe Road at Gunpowder Falls near Glencoe, Cold Bottom Road near Buffalo Creek, York Road North of Piney Hill Road and Reisterstown Road near Hammershire Road. PRECAUTIONARY/PREPAREDNESS ACTIONS... Turn around, don't drown when encountering flooded roads. Most flood deaths occur in vehicles. In hilly terrain there are hundreds of low water crossings which are potentially dangerous in heavy rain. Do not attempt to cross flooded roads. Find an alternate route. && FLASH FLOOD...RADAR AND GAUGE INDICATED; EXPECTED RAINFALL RATE...2-3 INCHES IN 1 HOUR
Flash Flood Warning
Issued: 7:17 PM Jul. 31, 2025 – National Weather Service
The National Weather Service in Sterling Virginia has issued a * Flash Flood Warning for... Western Cecil County in northeastern Maryland... North Central Baltimore County in northern Maryland... Northeastern Harford County in northern Maryland... * Until 615 PM EDT. * At 317 PM EDT, Doppler radar and automated rain gauges indicated thunderstorms producing heavy rain across the warned area. Up to 2 inches of rain have fallen. The expected rainfall rate is 1.5 to 2.5 inches in 30 minutes. Additional rainfall amounts of 2 to 3 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... Jarrettsville... Rising Sun... Conowingo... Octoraro... Rock Springs... Richardsmere... West Nottingham... Pylesville... Port Deposit... Darlington... Rocks... Street... Chrome Hill... Forest Hill... Whiteford... Cardiff... Scarboro... Norrisville... Parkton... Maryland Line... PRECAUTIONARY/PREPAREDNESS ACTIONS... Turn around, don't drown when encountering flooded roads. Most flood deaths occur in vehicles. Be aware of your surroundings and do not drive on flooded roads. && FLASH FLOOD...RADAR AND GAUGE INDICATED; EXPECTED RAINFALL RATE...1.5-2.5 INCHES IN 30 MINUTES
Marine Weather Statement
Issued: 5:14 PM Jul. 31, 2025 – National Weather Service
...GUSTY SOUTH WINDS AND DEVELOPING THUNDERSTORMS... Occasional southerly wind gusts to near 20 knots are possible this afternoon. In addition, thunderstorms will develop and produce gusty winds, heavy downpours and lightning strikes. Mariners should prepare to seek safe harbor.
Flood Watch
Issued: 4:25 PM Jul. 31, 2025 – National Weather Service
...FLOOD WATCH REMAINS IN EFFECT THROUGH LATE TONIGHT... * WHAT...Flash flooding caused by excessive rainfall continues to be possible. * WHERE...The District of Columbia, portions of Maryland, including the following areas, Anne Arundel, Calvert, Carroll, Cecil, Central and Southeast Howard, Central and Southeast Montgomery, Charles, Frederick MD, Northern Baltimore, Northwest Harford, Northwest Howard, Northwest Montgomery, Prince Georges, Southeast Harford, Southern Baltimore and St. Marys, and northern Virginia, including the following areas, Arlington/Falls Church/Alexandria, Central and Southeast Prince William/Manassas/Manassas Park, Eastern Loudoun, Fairfax, Northern Fauquier, Northwest Prince William, Southern Fauquier and Western Loudoun. * WHEN...Through late 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. Extensive street flooding and flooding of creeks and rivers are possible. * ADDITIONAL DETAILS... - Significant flash flooding is possible. Numerous showers and thunderstorms will develop and move across the area this afternoon into this evening. Thunderstorms will be capable of producing very heavy rain, with rainfall rates of 1 to 2 inches in 30 minutes. Widespread rainfall amounts of 1 to 2 inches are expected. Some areas could experience multiple rounds of thunderstorms, with higher rainfall amounts of 4 to 6 inches possible. This could result in numerous instances of flash flooding. Showers and thunderstorms will begin early this afternoon, and the heaviest rainfall is most likely from 3 PM to 8 PM. - 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. &&
Small Craft Advisory
Issued: 4:08 PM Jul. 31, 2025 – National Weather Service
...SMALL CRAFT ADVISORY IN EFFECT FROM MIDNIGHT TONIGHT TO MIDNIGHT EDT FRIDAY NIGHT... * WHAT...Northeast winds 10 to 15 kt with gusts up to 20 kt expected. * WHERE...Chesapeake Bay north of Sandy Point MD, Patapsco River including Baltimore Harbor, and Chester River to Queenstown MD. * WHEN...From midnight tonight to midnight EDT Friday night. * IMPACTS...Conditions will be hazardous to small craft. PRECAUTIONARY/PREPAREDNESS ACTIONS... Inexperienced mariners, especially those operating smaller vessels, should avoid navigating in hazardous conditions. &&
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