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

Winter Weather Advisory issued December 25 at 7:49PM EST until December 27 at 12:00AM EST by NWS Baltimore MD/Washington DC

Effective: Thu December 25, 2025, 7:49 PM
Expires: Fri December 26, 2025, 4:15 AM

...A MIXTURE OF FREEZING RAIN AND SLEET TO OVERSPREAD AREAS NORTH OF I-66/U.S. 50 ON FRIDAY... .As high pressure builds across Quebec, a steady stream of cold air will funnel southward into the Mid-Atlantic region. At the same time, moisture will overrun a frontal boundary across the central Appalachians down into the Carolinas. As milder air will settle above the sub-freezing surface layer, a wintry mix consisting of freezing rain and sleet is likely over portions of the area. Travel impacts are likely where the wintry mix falls. * WHAT...Mixed precipitation expected. Total snow and sleet accumulations up to one inch and ice accumulations around one tenth of an inch, with closer to a trace to a few hundredths of an inch to the south of I-70. * WHERE...Portions of central, north-central, and northern Maryland and northern Virginia. * WHEN...From noon Friday to midnight EST Friday Night. * IMPACTS...Plan on slippery road conditions. The hazardous conditions will impact the Friday evening commute. * ADDITIONAL DETAILS...Precipitation is likely to overspread the area by midday Friday in the form of sleet or freezing rain. Freezing rain with some sleet mixing in will continue through the afternoon and evening. A bit more sleet can be expected closer to the Maryland-Pennsylvania border. Through the day, temperatures are expected to remain close to 32 degrees. Precipitation exits off to the northeast with some light drizzle or freezing drizzle possibly lingering into the early overnight hours.

Slow down and use caution while traveling. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1.

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

Effective: Fri December 26, 2025, 7:26 AM
Expires: Fri December 26, 2025, 7:36 AM

Monitoring message only. Please disregard.

Monitoring message only. Please disregard.

Winter Weather Advisory issued December 26 at 3:04AM EST until December 27 at 12:00AM EST by NWS Baltimore MD/Washington DC

Effective: Fri December 26, 2025, 3:04 AM
Expires: Fri December 26, 2025, 11:15 AM

* WHAT...Mixed precipitation expected. Total ice accumulations between a trace and one tenth of an inch, with locally higher amounts possible closer to the Pennsylvania border. Sleet accumulations less than one half inch. * WHERE...Portions of central, north central, and northern Maryland and northern Virginia. * WHEN...From noon today to midnight EST tonight. * IMPACTS...Plan on slippery road conditions. The hazardous conditions could impact the Friday evening commute. * ADDITIONAL DETAILS...Precipitation is likely to overspread the area this afternoon in the form of sleet or freezing rain. Freezing rain with some sleet mixing in will continue through the afternoon and evening, although some lower elevations may just be plain rain. Temperatures will continue rising above freezing from south to north into the evening, allowing more places to change to rain, although some locations may hover near the freezing mark through tonight. Precipitation exits off to the northeast with some light drizzle or freezing drizzle possibly lingering into the early overnight hours.

Slow down and use caution while traveling. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1.

Winter Weather Advisory issued December 25 at 7:49PM EST until December 26 at 11:00PM EST by NWS Baltimore MD/Washington DC

Effective: Thu December 25, 2025, 7:49 PM
Expires: Fri December 26, 2025, 4:15 AM

...A MIXTURE OF FREEZING RAIN AND SLEET TO OVERSPREAD AREAS NORTH OF I-66/U.S. 50 ON FRIDAY... .As high pressure builds across Quebec, a steady stream of cold air will funnel southward into the Mid-Atlantic region. At the same time, moisture will overrun a frontal boundary across the central Appalachians down into the Carolinas. As milder air will settle above the sub-freezing surface layer, a wintry mix consisting of freezing rain and sleet is likely over portions of the area. Travel impacts are likely where the wintry mix falls. * WHAT...Mixed precipitation expected. Total snow and sleet accumulations up to one inch and ice accumulations around one tenth of an inch, with closer to a trace to a few hundredths of an inch near U.S. 50. * WHERE...Portions of north-central and western Maryland, northwest Virginia, and eastern West Virginia. * WHEN...From 10 AM to 11 PM EST Friday. * IMPACTS...Plan on slippery road conditions. The hazardous conditions will impact the Friday evening commute. * ADDITIONAL DETAILS...Precipitation is likely to overspread the area late Friday morning in the form of sleet or freezing rain. Freezing rain with some sleet mixing in will continue through the afternoon and evening. Through the day, temperatures are expected to remain close to 32 degrees before warming above freezing during the overnight hours.

Slow down and use caution while traveling. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1.

Winter Weather Advisory issued December 26 at 3:04AM EST until December 26 at 11:00PM EST by NWS Baltimore MD/Washington DC

Effective: Fri December 26, 2025, 3:04 AM
Expires: Fri December 26, 2025, 11:15 AM

* WHAT...Mixed precipitation expected. Total ice accumulations between a trace and tenth of an inch, with locally higher amounts possible near the Pennsylvania border. Sleet accumulations less than one half inch. * WHERE...Portions of north central and western Maryland, northwest Virginia, and eastern West Virginia. * WHEN...From 10 AM this morning to 11 PM EST this evening. * IMPACTS...Plan on slippery road conditions. The hazardous conditions could impact the Friday evening commute. * ADDITIONAL DETAILS...Precipitation is likely to overspread the area between late morning and mid afternoon in the form of sleet or freezing rain. Freezing rain with some sleet mixing in will continue through the afternoon and evening, although some locations near and south of Route 50 may be plain rain. Temperatures will continue rising above freezing from south to north into the evening, allowing more places to change to rain, although some locations may hover near the freezing mark through tonight.

Slow down and use caution while traveling. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1.