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

Elevation Above Sea Level: 184 feet / 56 meters

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

GPS Coordinates: 38.97594346, -77.24581439

Nearby Water Temperatures

Heat Advisory issued June 24 at 8:43PM EDT until June 25 at 9:00PM EDT by NWS Baltimore MD/Washington DC

Effective: Tue June 24, 2025, 8:43 PM
Expires: Wed June 25, 2025, 4:45 AM

* WHAT...Heat index values up to 108 expected. * WHERE...Portions of DC, central, north central, northeast, northern, and southern Maryland, central, northern, and northwest Virginia, and panhandle West Virginia. * WHEN...From 11 AM to 9 PM EDT Wednesday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses.

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.

Extreme Heat Warning issued June 24 at 5:23PM EDT until June 24 at 9:00PM EDT by NWS Baltimore MD/Washington DC

Effective: Tue June 24, 2025, 5:23 PM
Expires: Wed June 25, 2025, 1:30 AM

* WHAT...For the Extreme Heat Warning, dangerously hot conditions with heat index values up to 111. For the Heat Advisory, heat index values up to 108 expected. * WHERE...Portions of DC, central, north central, northeast, northern, and southern Maryland, and central, northern, and northwest Virginia. * WHEN...For the Extreme Heat Warning, until 9 PM EDT this evening. For the Heat Advisory, from 11 AM to 9 PM EDT Wednesday. * IMPACTS...Heat related illnesses increase significantly during extreme heat and high humidity events. Hot temperatures and high humidity may cause heat illnesses.

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.

Heat Advisory issued June 24 at 5:23PM EDT until June 25 at 9:00PM EDT by NWS Baltimore MD/Washington DC

Effective: Tue June 24, 2025, 5:23 PM
Expires: Wed June 25, 2025, 1:30 AM

* WHAT...For the Extreme Heat Warning, dangerously hot conditions with heat index values up to 111. For the Heat Advisory, heat index values up to 108 expected. * WHERE...Portions of DC, central, north central, northeast, northern, and southern Maryland, and central, northern, and northwest Virginia. * WHEN...For the Extreme Heat Warning, until 9 PM EDT this evening. For the Heat Advisory, from 11 AM to 9 PM EDT Wednesday. * IMPACTS...Heat related illnesses increase significantly during extreme heat and high humidity events. Hot temperatures and high humidity may cause heat illnesses.

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.

Heat Advisory issued June 24 at 8:43PM EDT until June 25 at 9:00PM EDT by NWS Baltimore MD/Washington DC

Effective: Tue June 24, 2025, 8:43 PM
Expires: Wed June 25, 2025, 4:45 AM

* WHAT...Heat index values up to 108 expected. * WHERE...Portions of DC, central, north central, northeast, northern, and southern Maryland, central, northern, and northwest Virginia, and panhandle West Virginia. * WHEN...From 11 AM to 9 PM EDT Wednesday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses.

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.

Extreme Heat Warning issued June 24 at 5:23PM EDT until June 24 at 9:00PM EDT by NWS Baltimore MD/Washington DC

Effective: Tue June 24, 2025, 5:23 PM
Expires: Wed June 25, 2025, 1:30 AM

* WHAT...For the Extreme Heat Warning, dangerously hot conditions with heat index values up to 111. For the Heat Advisory, heat index values up to 108 expected. * WHERE...Portions of DC, central, north central, northeast, northern, and southern Maryland, and central, northern, and northwest Virginia. * WHEN...For the Extreme Heat Warning, until 9 PM EDT this evening. For the Heat Advisory, from 11 AM to 9 PM EDT Wednesday. * IMPACTS...Heat related illnesses increase significantly during extreme heat and high humidity events. Hot temperatures and high humidity may cause heat illnesses.

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.