Weather Alerts For Clarksburg, MD

# HEADLINE -------------------- EXTREME HEAT WARNING REMAINS IN EFFECT UNTIL 9 PM EDT THIS EVENING # DETAILS -------------------- WHAT Dangerously hot conditions with heat index values of 110 to 115. WHERE Portions of DC, central, north central, northeast, northern, and southern Maryland, and central, northern, and northwest Virginia. WHEN Until 9 PM EDT this evening. IMPACTS Heat related illnesses increase significantly during extreme heat and high humidity events. ADDITIONAL DETAILS Prolonged excessive heat may impact power, water, and transportation systems. Heat index values around 100 to 105 are possible again Sunday afternoon. ISSUED AT Saturday, July 4, 2026 at 5:02 PM EDT ISSUED BY National Weather Service Baltimore MD/Washington DC HEADER URGENT - WEATHER MESSAGE # 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. Do not leave young children and pets in unattended vehicles. Car interiors will reach lethal temperatures in a matter of minutes. 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. # AREAS AFFECTED -------------------- Calvert, Central and Southeast Prince William/Manassas/Manassas Park, Northwest Howard, Orange, Southeast Harford, Southern Baltimore, Stafford, Albemarle, Anne Arundel, Arlington/Falls Church/Alexandria, Carroll, Cecil, Central and Southeast Howard, Central and Southeast Montgomery, Charles, Culpeper, District of Columbia, Eastern Loudoun, Fairfax, Frederick, Greene, King George, Madison, Nelson, Northern Baltimore, Northern Fauquier, Northwest Harford, Northwest Montgomery, Northwest Prince William, Prince Georges, Rappahannock, Southern Fauquier, Spotsylvania, St. Marys, Western Loudoun

# SUMMARY -------------------- THE NATIONAL WEATHER SERVICE HAS ISSUED SEVERE THUNDERSTORM WATCH 457 IN EFFECT UNTIL 10 PM EDT THIS EVENING FOR THE FOLLOWING AREAS THE DISTRICT OF COLUMBIA IN MARYLAND THIS WATCH INCLUDES 16 COUNTIES IN CENTRAL MARYLAND ANNE ARUNDEL HOWARD MONTGOMERY PRINCE GEORGES IN NORTH CENTRAL MARYLAND CARROLL FREDERICK WASHINGTON IN NORTHEAST MARYLAND CECIL IN NORTHERN MARYLAND BALTIMORE BALTIMORE CITY HARFORD IN SOUTHERN MARYLAND CALVERT CHARLES ST. MARYS IN WESTERN MARYLAND ALLEGANY GARRETT IN VIRGINIA THIS WATCH INCLUDES 34 COUNTIES IN CENTRAL VIRGINIA ALBEMARLE CITY OF CHARLOTTESVILLE CITY OF FREDERICKSBURG GREENE KING GEORGE NELSON ORANGE SPOTSYLVANIA IN NORTHERN VIRGINIA ARLINGTON CITY OF ALEXANDRIA CITY OF FAIRFAX CITY OF FALLS CHURCH CITY OF MANASSAS CITY OF MANASSAS PARK CULPEPER FAIRFAX FAUQUIER LOUDOUN PRINCE WILLIAM STAFFORD IN NORTHWEST VIRGINIA CITY OF WINCHESTER CLARKE FREDERICK MADISON PAGE RAPPAHANNOCK SHENANDOAH WARREN IN WESTERN VIRGINIA AUGUSTA CITY OF HARRISONBURG CITY OF STAUNTON CITY OF WAYNESBORO HIGHLAND ROCKINGHAM IN WEST VIRGINIA THIS WATCH INCLUDES 8 COUNTIES IN EASTERN WEST VIRGINIA GRANT HAMPSHIRE HARDY MINERAL PENDLETON IN PANHANDLE WEST VIRGINIA BERKELEY JEFFERSON MORGAN THIS INCLUDES THE CITIES OF ABERDEEN, ABINGDON, ADAMS MORGAN, ADEN, AIRLIE, ALBIN, ALEXANDRIA, ALONZAVILLE, ALSOP, ANDORA, ANNANDALE, ANNAPOLIS, ANTIOCH, APPLETON, ARCO, ARKENDALE, ARLINGTON, ARNOLD, BAKERTON, BALLENGER CREEK, BALLSTON, BALTIMORE, BARCROFT, BARKSDALE, BAY VIEW, BEAN SETTLEMENT, BENTONVILLE, BERKELEY SPGS, BERRYVILLE, BERRYVILLE, BETHEL, BETHESDA, BLAKE, BLOOMERY, BOHEMIAS MILLS, BOWIE, BOYDS, BRADY, BRAKE, BRANDYWINE, BRANTWOOD, BROKENBURG, BROOKFIELD, BROOMES ISLAND, BUCKEYSTOWN, BUCKTON, BURKE, BURR HILL, BYNUM, CABINS, CALIFORNIA, CALLAWAY, CARDOVA, CATALPA, CATONSVILLE, CEDAR GROVE, CEDARVILLE, CHANTILLY, CHARLES TOWN, CHARLOTTESVILLE, CHERRYDALE, CHESAPEAKE BEACH, CHESTER GAP, CHRISTIAN, CHURCHVILLE, CLARKSVILLE, CLARY, CLINTON, CLOVER CREEK, COLLEGE PARK, COLUMBIA, COMPTON, COUNTRYSIDE, COVE POINT, CULPEPER, CUMBERLAND, DAHLGREN, DALE CITY, DAMERON, DRUM POINT, DULLES INTERNATIONAL AIRPORT, DUNDALK, DUNKIRK, EDGEWOOD, ELDERSBURG, ELLERSLIE, ESSEX, EVERONA, FAIRFAX, FAIRFAX STATION, FAIRVIEW, FALLS CHURCH, FALMOUTH, FELLS POINT, FISHER, FIVE FORKS, FORDSVILLE, FORT ASHBY, FOUR CORNERS, FRANKLIN, FREDERICK, FREDERICKSBURG, FRENCHBURG, FRONT ROYAL, FROSTBURG, GAINESBORO, GAITHERSBURG, GAMBER, GARRISONVILLE, GATEWOOD, GERMANTOWN, GLEEDSVILLE, GLEN BURNIE, GLEN ECHO, GLENDIE, GLENMONT, GRANTSVILLE, GREENBELT, GREENFIELD, HAGERSTOWN, HALFWAY, HAMBURG, HANCOCK, HARFORD FURNACE, HARRISONBURG, HAWKINSTOWN, HEADSVILLE, HICKORY, HIGHTOWN, HISTORIC ELLICOTT CITY, HOWELLSVILLE, INDEPENDENT HILL, KEYSER, KIMBALL, KLINE GAP, LAHORE, LAKE RIDGE, LANDES, LANGLEY, LEESBURG, LEXINGTON PARK, LIBERTY, LINVILLE, LONG BEACH, LUCKETTS, LURAY, MADISON MILLS, MADISON RUN, MAGNOLIA, MAGNOLIA, MANASSAS, MANASSAS PARK, MARTINSBURG, MASONVILLE, MASSAPONAX, MCCOOLE, MCDOWELL, MCLEAN, MCNEILL, MIDDLEWAY, MILL GAP, MILLVILLE, MONTCLAIR, MONTEBELLO, MONTEREY, MONTPELIER, MOOREFIELD, MOUNT CLIFTON, MOUNT HARMONY, MOUNT JACKSON, MOUNTAIN LAKE PARK, MUSTOE, NASONS, NEW CREEK, OAK FLAT, OAK GROVE, OAKLAND, ORANGE, OVERTON, PARK HEIGHTS, PARK MILLS, PARKVILLE, PARTLOW, PAW PAW, PETERSBURG, PINEY POINT, POINTS, POST OAK, PURGITSVILLE, RANDALLSTOWN, RANSON, RAPIDAN, RAWLINGS, REAGAN NATIONAL AIRPORT, RESTON, REVA, RIDGE, RIDGEVILLE, RIDGEWAY, RILEYVILLE, RIVERCREST, RIVERTON, ROLLINS FORK, ROMNEY, ROSSLYN, RUDDLE, RUSSELLDALE, SEVERN, SEVERNA PARK, SEYMOURVILLE, SHADY GROVE, SHADY GROVE, SHENANDOAH JUNCTION, SHILOH, SILVER SPRING, SIMPSONVILLE, SKYLAND, SMITH CROSSROADS, SOTTERLEY, SOUTH GATE, SPOTSYLVANIA COURT, SPOTTSWOOD, SPRINGFIELD, ST. CHARLES, STAUNTON, STERLING PARK, STEVENSBURG, STRASBURG, STRINGTOWN, STUARTS DRAFT, SUGAR GROVE, SUITLAND-SILVER HILL, TANTALLON, THREE CHURCHES, TOWSON, TURNBULL, TWYMANS MILL, UNIONVILLE, WALDORF, WAPOCOMO, WARRENTON, WASHINGTON, WAYNESBORO, WELTON, WESTMINSTER, WIDEWATER, WINCHESTER, WINSTON, WOODBRIDGE, WOODLAWN, WOODSTOCK, AND WOODSTOCK. # DETAILS -------------------- ISSUED AT Saturday, July 4, 2026 at 2:16 PM EDT ISSUED BY NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC HEADER WATCH COUNTY NOTIFICATION FOR WATCH 457

Closest strike: 12.79 miles Storms Approaching Stay alert and frequently check WeatherBug to see if storms are moving toward you. Be mindful that new storms can also form with little notice.

There is a Enhanced Severe Storm Risk for your location. Continue reading for today's outlook from the National Weather Service's Storm Prediction Center. -------------------- National Severe Storm Outlook THERE IS AN ENHANCED RISK OF SEVERE THUNDERSTORMS OVER PARTS OF THE SOUTHERN PLAINS AND MID ATLANTIC THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS OVER PORTIONS OF THE CENTRAL HIGH PLAINS AND FROM THE SOUTHERN HIGH PLAINS TO SOUTHERN NEW ENGLAND SUMMARY Clusters of storms will continue to move across parts of the Allegheny Plateau into the Mid-Atlantic, with potential for numerous damaging wind gusts. Additional severe thunderstorms are still expected across the Great Plains this afternoon and evening, posing a risk for severe wind gusts and large hail. 20Z Update A cold-pool-driven MCS, with a history of measured 50+ kt gusts and wind damage, continues to rapidly propagate eastward across central MO. While deep-layer shear is quite modest over the Ozarks, a pronounced baroclinic boundary is draped across central MO into the St. Louis Metropolitan area. The MCS has likely maintained its intensity thus far by riding this boundary and ingesting some vorticity for bookend vortex and rear-inflow jet maintenance. It is unclear how long this MCS will remain strong/organized given the lack of ambient deep-layer shear. However. surface temperatures on the warm side of the boundary exceeding 90 F, amid mid 70s F dewpoints, is yielding a gradient of 2500-4500 J/kg SBCAPE, which should support some severe gust threat for this MCS for at least the next few hours. As such, 30 percent wind probabilities have been added ahead of the MCS. Guidance consensus, including early depictions from WoFS output, suggests that an MCS will quickly surge southeastward across portions of the southern Plains after initiating along the KS/OK border late this afternoon. The farther southeast initiation (given the current position of the surface outflow boundary left behind from the previous MCS), and southeastward surging potential, it appears that the greatest wind threat will exist into east-central OK. 30 percent/CIG1 wind probabilities have been extended into this region. Five percent hail probabilities have been added across portions of the lower Hudson Valley. Here, MRMS mosaic MESH data suggests that marginally severe hail may already be falling with the more robust storms over northern PA. Furthermore, stronger mid-level flow is grazing the lower Hudson Valley, contributing to 30-40 kts of effective bulk shear amid 1000+ J/kg MLCAPE, which should be adequate to support a continued hail threat. Otherwise, the previous forecast remains on track, including the potential for numerous damaging to occasionally severe gusts expected across portions of the Mid Atlantic into southern New England through the afternoon and evening hours. Mostly minor adjustments have been made to the remainder of the outlook to account for guidance consensus and observations.