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

Cold Weather Advisory issued January 31 at 3:12PM EST until February 1 at 1:00PM EST by NWS Baltimore MD/Washington DC

Effective: Sat January 31, 2026, 3:12 PM
Expires: Sat January 31, 2026, 11:30 PM

* WHAT...Very cold wind chills of 0 to 12 below. * WHERE...Washington DC, and portions of central, northeast, northern, and southern Maryland, and central, northern, and northwest Virginia. * WHEN...From 10 PM this evening to 1 PM EST Sunday. * IMPACTS...The cold weather could result in hypothermia or frostbite if precautions are not taken.

Dress in layers including a hat, face mask, and gloves if you must go outside. Keep pets indoors as much as possible. Make sure outdoor animals have a warm, dry shelter, food, and unfrozen water. Make frequent checks on older family, friends, and neighbors. Ensure portable heaters are used correctly. Do not use generators or grills inside.

Cold Weather Advisory issued January 31 at 11:24PM EST until February 1 at 1:00PM EST by NWS Baltimore MD/Washington DC

Effective: Sat January 31, 2026, 11:24 PM
Expires: Sun February 1, 2026, 7:30 AM

* WHAT...Very cold wind chills as low as 10 below. * WHERE...Portions of DC, central, northeast, northern, and southern Maryland, and central, northern, and northwest Virginia. * WHEN...Until 1 PM EST Sunday. * IMPACTS...The cold weather could result in hypothermia or frostbite if precautions are not taken.

Dress in layers including a hat, face mask, and gloves if you must go outside. Keep pets indoors as much as possible. Make sure outdoor animals have a warm, dry shelter, food, and unfrozen water. Make frequent checks on older family, friends, and neighbors. Ensure portable heaters are used correctly. Do not use generators or grills inside.

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

Effective: Sun February 1, 2026, 1:22 AM
Expires: Sun February 1, 2026, 1:32 AM

Monitoring message only. Please disregard.

Monitoring message only. Please disregard.

Cold Weather Advisory issued January 31 at 3:12PM EST until February 1 at 1:00PM EST by NWS Baltimore MD/Washington DC

Effective: Sat January 31, 2026, 3:12 PM
Expires: Sat January 31, 2026, 11:30 PM

* WHAT...Very cold wind chills of 8 below to 16 below in the valleys, and 10 below to 20 below on the ridges. * WHERE...Portions of north-central and western Maryland, northwest Virginia, and eastern West Virginia. * WHEN...From 10 PM this evening to 1 PM EST Sunday. * IMPACTS...The cold weather could result in hypothermia or frostbite if precautions are not taken.

Dress in layers including a hat, face mask, and gloves if you must go outside. Keep pets indoors as much as possible. Make sure outdoor animals have a warm, dry shelter, food, and unfrozen water. Make frequent checks on older family, friends, and neighbors. Ensure portable heaters are used correctly. Do not use generators or grills inside.

Cold Weather Advisory issued January 31 at 11:24PM EST until February 1 at 1:00PM EST by NWS Baltimore MD/Washington DC

Effective: Sat January 31, 2026, 11:24 PM
Expires: Sun February 1, 2026, 7:30 AM

* WHAT...Very cold wind chills of 8 below to 16 below in the valleys, and 10 below to 20 below on the ridges. * WHERE...Portions of north central and western Maryland, northwest Virginia, and eastern and panhandle West Virginia. * WHEN...Until 1 PM EST Sunday. * IMPACTS...The cold weather could result in hypothermia or frostbite if precautions are not taken.

Dress in layers including a hat, face mask, and gloves if you must go outside. Keep pets indoors as much as possible. Make sure outdoor animals have a warm, dry shelter, food, and unfrozen water. Make frequent checks on older family, friends, and neighbors. Ensure portable heaters are used correctly. Do not use generators or grills inside.