Station Name: DEAD RUN AT WHANN AVENUE NEAR MCLEAN, VA
Data Source: Water Data - usgc.gov

Elevation Above Sea Level: 226 feet / 69 meters

Nearest Address:
800 Whann Ave
McLean, VA 22101
Fairfax County

GPS Coordinates: 38.95977716, -77.1756743

Nearby Water Temperatures

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

Effective: Thu October 23, 2025, 8:24 AM
Expires: Thu October 23, 2025, 8:34 AM

Monitoring message only. Please disregard.

Monitoring message only. Please disregard.

Frost Advisory issued October 23 at 2:04AM EDT until October 24 at 9:00AM EDT by NWS Baltimore MD/Washington DC

Effective: Thu October 23, 2025, 2:04 AM
Expires: Thu October 23, 2025, 10:15 AM

* WHAT...Temperatures as low as 33 will result in frost formation. * WHERE...Portions of north central Maryland, central, northern, and northwest Virginia, and panhandle West Virginia. * WHEN...From 2 AM to 9 AM EDT Friday. * IMPACTS...Frost could harm sensitive outdoor vegetation. Sensitive outdoor plants may be killed if left uncovered.

Take steps now to protect tender plants from the cold.

Frost Advisory issued October 23 at 8:02AM EDT until October 24 at 9:00AM EDT by NWS Baltimore MD/Washington DC

Effective: Thu October 23, 2025, 8:02 AM
Expires: Thu October 23, 2025, 4:15 PM

* WHAT...Temperatures as low as 33 will result in frost formation. * WHERE...Portions of north central Maryland, central, northern, and northwest Virginia, and the eastern panhandle of West Virginia. * WHEN...From 2 AM to 9 AM EDT Friday. * IMPACTS...Frost could harm sensitive outdoor vegetation. Sensitive outdoor plants may be killed if left uncovered.

Take steps now to protect tender plants from the cold.

Special Weather Statement issued October 23 at 8:10AM EDT by NWS Baltimore MD/Washington DC

Effective: Thu October 23, 2025, 8:10 AM
Expires: Thu October 23, 2025, 7:00 PM

The combination of recent dry conditions, relative humidity falling to 15 to 30 percent, and sustained west winds 10 to 15 mph with gusts of 20 to 30 mph will likely result in an elevated threat for the rapid spread of fires today, particularly from late morning through late afternoon. Please refer to your local burn permitting authorities on whether you may burn outdoors. If you do burn, use extreme caution since fires can quickly grow out of control under these conditions.

Freeze Warning issued October 23 at 2:04AM EDT until October 24 at 9:00AM EDT by NWS Baltimore MD/Washington DC

Effective: Thu October 23, 2025, 2:04 AM
Expires: Thu October 23, 2025, 10:15 AM

* WHAT...Sub-freezing temperatures as low as 29 expected. * WHERE...Culpeper, Northern Fauquier, Southern Fauquier, Clarke, Frederick VA, Madison, Page, Rappahannock, and Warren Counties. * WHEN...From 2 AM to 9 AM EDT Friday. * IMPACTS...Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing.

Take steps now to protect tender plants from the cold. To prevent water pipes from freezing, wrap or drain or allow them to drip slowly.

Freeze Warning issued October 23 at 8:02AM EDT until October 24 at 9:00AM EDT by NWS Baltimore MD/Washington DC

Effective: Thu October 23, 2025, 8:02 AM
Expires: Thu October 23, 2025, 4:15 PM

* WHAT...Sub-freezing temperatures as low as 29 expected. * WHERE...Culpeper, Northern Fauquier, Southern Fauquier, Clarke, Frederick VA, Madison, Page, Rappahannock, and Warren Counties. * WHEN...From 2 AM to 9 AM EDT Friday. * IMPACTS...Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing.

Take steps now to protect tender plants from the cold. To prevent water pipes from freezing, wrap or drain or allow them to drip slowly.

Special Weather Statement issued October 23 at 3:26AM EDT by NWS Baltimore MD/Washington DC

Effective: Thu October 23, 2025, 3:26 AM
Expires: Thu October 23, 2025, 9:30 AM

The combination of recent dry conditions, relative humidity falling to 25 to 30 percent, and sustained west winds 10 to 15 mph with gusts of 20 to 25 mph will likely result in an elevated threat for the rapid spread of fires today, particularly from late morning through late afternoon. Please refer to your local burn permitting authorities on whether you may burn outdoors. If you do burn, use extreme caution since fires can quickly grow out of control under these conditions.