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 27 at 11:39PM EST until January 28 at 11:00AM EST by NWS Baltimore MD/Washington DC

Effective: Tue January 27, 2026, 11:39 PM
Expires: Wed January 28, 2026, 7:45 AM

* WHAT...For the first Cold Weather Advisory, very cold wind chills as low as 8 below zero. For the second Cold Weather Advisory, very cold wind chills as low as 8 below zero expected. * WHERE...Portions of DC, central, northeast, northern, and southern Maryland, and northern and western Virginia. * WHEN...For the first Cold Weather Advisory, until 11 AM EST Wednesday. For the second Cold Weather Advisory, from 7 PM Wednesday to 11 AM EST Thursday. * IMPACTS...The cold wind chills as low as 8 below zero could result in hypothermia if precautions are not taken. Frostbite and hypothermia will occur if unprotected skin is exposed to these temperatures. Wind chill values can lead to hypothermia with prolonged exposure. Very cold temperatures can lead to hypothermia with prolonged exposure. * ADDITIONAL DETAILS...Additional Cold Weather Headlines are expected at times through the end of the week as the region remains in an Arctic airmass.

Use caution while traveling outside. Wear appropriate clothing, a hat, and gloves. 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 27 at 11:39PM EST until January 29 at 11:00AM EST by NWS Baltimore MD/Washington DC

Effective: Tue January 27, 2026, 11:39 PM
Expires: Wed January 28, 2026, 7:45 AM

* WHAT...For the first Cold Weather Advisory, very cold wind chills as low as 8 below zero. For the second Cold Weather Advisory, very cold wind chills as low as 8 below zero expected. * WHERE...Portions of DC, central, northeast, northern, and southern Maryland, and northern and western Virginia. * WHEN...For the first Cold Weather Advisory, until 11 AM EST Wednesday. For the second Cold Weather Advisory, from 7 PM Wednesday to 11 AM EST Thursday. * IMPACTS...The cold wind chills as low as 8 below zero could result in hypothermia if precautions are not taken. Frostbite and hypothermia will occur if unprotected skin is exposed to these temperatures. Wind chill values can lead to hypothermia with prolonged exposure. Very cold temperatures can lead to hypothermia with prolonged exposure. * ADDITIONAL DETAILS...Additional Cold Weather Headlines are expected at times through the end of the week as the region remains in an Arctic airmass.

Use caution while traveling outside. Wear appropriate clothing, a hat, and gloves. 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: Wed January 28, 2026, 1:22 AM
Expires: Wed January 28, 2026, 1:32 AM

Monitoring message only. Please disregard.

Monitoring message only. Please disregard.

Cold Weather Advisory issued January 27 at 11:39PM EST until January 28 at 11:00AM EST by NWS Baltimore MD/Washington DC

Effective: Tue January 27, 2026, 11:39 PM
Expires: Wed January 28, 2026, 7:45 AM

* WHAT...Very cold wind chills as low as 2 below. * WHERE...Albemarle, Greene, King George, Orange, Spotsylvania, Culpeper, Southern Fauquier, Stafford, Madison, and Rappahannock Counties. * WHEN...Until 11 AM EST Wednesday. * IMPACTS...Frostbite and hypothermia will occur if unprotected skin is exposed to these temperatures.

Use caution while traveling outside. Wear appropriate clothing, a hat, and gloves. Keep pets indoors as much as possible. Make sure outdoor animals have a warm, dry shelter, food, and unfrozen water.