SMWLWX The National Weather Service in Sterling Virginia has issued a * Special Marine Warning for. Chesapeake Bay from Pooles Island to Sandy Point MD. Chesapeake Bay from Sandy Point to North Beach MD. Chester River to Queenstown MD. Eastern Bay. * Until 445 PM EDT. * At 345 PM EDT, a strong thunderstorm was located over Annapolis, moving east 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. Parsons Island, Kent Narrows Bridge, Magothy River, Chester River, Eastern Bay, Greenbury Point, Miles River, Love Point, Naval Academy, Highland Beach, Sandy Point State Park, Baltimore Light, Severn River, Romancoke, Bloody Point Light, Matapeake, Chesapeake Bay Bridge, Thomas Point Light, Mayo, and Annapolis.

* WHAT. Heat index values up to 107 expected. * WHERE. Portions of central, northeast, northern and southern Maryland, The District of Columbia and central and northern Virginia. * WHEN. From noon to 8 PM EDT Thursday. * IMPACTS. Hot temperatures and high humidity may cause heat illnesses to occur.

The areas affected include. Chesapeake Bay from North Beach to Drum Point MD. Chesapeake Bay from Pooles Island to Sandy Point MD. Chesapeake Bay from Sandy Point to North Beach MD. Chester River to Queenstown MD. Choptank River to Cambridge MD and the Little Choptank River. Eastern Bay. Patapsco River including Baltimore Harbor. At 320 PM EDT, Doppler radar indicated a group of showers, capable of producing winds to around 30 knots. These showers were located near Annapolis, moving east at 20 knots.

* WHAT. Heat index values 100 to 104 expected. * WHERE. Adams, Cumberland, Dauphin, Franklin, Lancaster, Lebanon, Perry, and York Counties. * WHEN. From noon Thursday to 8 PM EDT Friday. * IMPACTS. Hot temperatures and high humidity may cause heat illnesses. Heat-related impacts are likely in some health systems, heat-sensitive industries and infrastructure.

SVRLWX The National Weather Service in Sterling Virginia has issued a * Severe Thunderstorm Warning for. The northeastern District of Columbia. Southeastern Montgomery County in central Maryland. Northwestern Prince Georges County in central Maryland. * Until 530 PM EDT. * At 429 PM EDT, a severe thunderstorm was located over Fort Totten, moving east at 10 mph. HAZARD. 60 mph wind gusts and quarter size hail. SOURCE. Radar indicated. IMPACT. Damaging winds will cause some trees and large branches to fall. This could injure those outdoors, as well as damage homes and vehicles. Roadways may become blocked by downed trees. Localized power outages are possible. Unsecured light objects may become projectiles. * Locations impacted include. College Park, Greenbelt, Langley Park, Beltsville, Bladensburg, Fort Totten, University of Maryland, Howard University, Landover, Hyattsville, Takoma Park, East Riverdale, Adelphi, New Carrollton, Mitchellville, Lake Arbor, Chevy Chase, Riverdale Park, Cheverly, and Woodmore.

SVRPHI The National Weather Service in Mount Holly NJ has issued a * Severe Thunderstorm Warning for. Northeastern Talbot County in eastern Maryland. Southwestern Queen Anne's County in northeastern Maryland. * Until 515 PM EDT. * At 429 PM EDT, a severe thunderstorm was located over Chester, or 10 miles east of Severn River, moving southeast at 20 mph. HAZARD. 60 mph wind gusts and penny size hail. SOURCE. Radar indicated. IMPACT. Damage to roofs, siding, trees, and power lines is possible. * Locations impacted include. Easton, Romancoke, Queen Anne, Grasonville, Stevensville, Skipton, Copperville, Chester, Matthews, Wye Mills, Cordova, Queenstown, Hillsboro, Stevensville South, and Dominion.