Station Name: DIFFICULT RUN NEAR GREAT FALLS, VA
Data Source: Water Data - usgc.gov

Elevation Above Sea Level: 184 feet

Nearest Address:
9200 Old Dominion Dr
McLean, VA 22102
Fairfax County

GPS Coordinates: 38.97594346, -77.24581439

Nearby Water Temperatures

Severe Thunderstorm Watch issued May 20 at 12:39PM EDT until May 20 at 8:00PM EDT by NWS Baltimore MD/Washington DC

Effective: Wed May 20, 2026, 12:39 PM
Expires: Wed May 20, 2026, 8:00 PM

THE NATIONAL WEATHER SERVICE HAS ISSUED SEVERE THUNDERSTORM WATCH 234 IN EFFECT 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 WASHINGTON IN NORTHEAST MARYLAND CECIL IN NORTHERN MARYLAND BALTIMORE BALTIMORE CITY HARFORD IN WESTERN MARYLAND ALLEGANY GARRETT IN VIRGINIA THIS WATCH INCLUDES 22 COUNTIES IN CENTRAL VIRGINIA GREENE 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 IN NORTHWEST VIRGINIA CITY OF WINCHESTER CLARKE FREDERICK MADISON PAGE RAPPAHANNOCK SHENANDOAH WARREN IN WESTERN VIRGINIA CITY OF HARRISONBURG 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, ANDORA, ANNANDALE, ANNAPOLIS, ANTIOCH, APPLETON, ARCO, 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, BUCKEYSTOWN, BUCKTON, BURKE, BYNUM, CABINS, CARDOVA, CATALPA, CATONSVILLE, CEDAR GROVE, CEDARVILLE, CHANTILLY, CHARLES TOWN, CHERRYDALE, CHESTER GAP, CLARKSVILLE, CLARY, CLINTON, COLLEGE PARK, COLUMBIA, COMPTON, COUNTRYSIDE, CULPEPER, CUMBERLAND, DALE CITY, DULLES INTERNATIONAL AIRPORT, DUNDALK, EDGEWOOD, ELDERSBURG, ELLERSLIE, ESSEX, FAIRFAX, FAIRFAX STATION, FAIRVIEW, FALLS CHURCH, FELLS POINT, FISHER, FIVE FORKS, FORDSVILLE, FORT ASHBY, FOUR CORNERS, FRANKLIN, FREDERICK, FRENCHBURG, FRONT ROYAL, FROSTBURG, GAINESBORO, GAITHERSBURG, GAMBER, GERMANTOWN, GLEEDSVILLE, GLEN BURNIE, GLEN ECHO, GLENMONT, GRANTSVILLE, GREENBELT, HAGERSTOWN, HALFWAY, HAMBURG, HANCOCK, HARFORD FURNACE, HARRISONBURG, HAWKINSTOWN, HEADSVILLE, HICKORY, HISTORIC ELLICOTT CITY, HOWELLSVILLE, INDEPENDENT HILL, KEYSER, KIMBALL, KLINE GAP, LAKE RIDGE, LANDES, LANGLEY, LEESBURG, LINVILLE, LUCKETTS, LURAY, MADISON MILLS, MAGNOLIA, MAGNOLIA, MANASSAS, MANASSAS PARK, MARTINSBURG, MASONVILLE, MCCOOLE, MCLEAN, MCNEILL, MIDDLEWAY, MILLVILLE, MONTCLAIR, MONTPELIER, MOOREFIELD, MOUNT CLIFTON, MOUNT JACKSON, MOUNTAIN LAKE PARK, NEW CREEK, OAK FLAT, OAK GROVE, OAKLAND, PARK HEIGHTS, PARK MILLS, PARKVILLE, PAW PAW, PETERSBURG, POINTS, PURGITSVILLE, RANDALLSTOWN, RANSON, RAPIDAN, RAWLINGS, REAGAN NATIONAL AIRPORT, RESTON, REVA, RIDGEVILLE, RIDGEWAY, RILEYVILLE, RIVERCREST, RIVERTON, ROMNEY, ROSSLYN, RUDDLE, RUSSELLDALE, SEVERN, SEVERNA PARK, SEYMOURVILLE, SHADY GROVE, SHADY GROVE, SHENANDOAH JUNCTION, SILVER SPRING, SIMPSONVILLE, SKYLAND, SMITH CROSSROADS, SOUTH GATE, SPRINGFIELD, STERLING PARK, STEVENSBURG, STRASBURG, STRINGTOWN, SUGAR GROVE, SUITLAND-SILVER HILL, TANTALLON, THREE CHURCHES, TOWSON, TURNBULL, TWYMANS MILL, WAPOCOMO, WARRENTON, WASHINGTON, WELTON, WESTMINSTER, WINCHESTER, WINSTON, WOODBRIDGE, WOODLAWN, WOODSTOCK, AND WOODSTOCK.

This is only a test for monitoring of vital dissemination systems.

Effective: Wed May 20, 2026, 2:30 PM
Expires: Wed May 20, 2026, 2:40 PM

Monitoring message only. Please disregard.

Monitoring message only. Please disregard.