Lead
Preliminary data from the National Weather Service Sunday afternoon show Fairfax County, particularly Vienna, received the heaviest snowfall from this weekend’s winter storm, with Vienna measuring 8 inches. Most of Northern Virginia recorded between 4 and 8 inches of combined snow and sleet Saturday night into Sunday. The NWS kept a winter-storm warning in effect for the entire Washington, D.C., region through 4 a.m. Monday, and preliminary reports were still being compiled as of 4:30 p.m. Sunday. Local agencies warned of hazardous travel and patchy power impacts as crews worked to assess conditions.
Key Takeaways
- Vienna (Fairfax County) measured the highest preliminary total at 8.0 inches, according to NWS reports submitted by 4:30 p.m. Sunday.
- Ashburn (Loudoun County) reported 7.8 inches and Herndon (Fairfax County) 7.6 inches, among the next-highest totals in the region.
- Several Northern Virginia locations recorded midrange totals: most sites reported between 4 and 7.5 inches of snow and sleet.
- Specific airport and corridor reports include Reagan National Airport at 5.3 inches and Dulles International at 6.2 inches, which can affect flight operations and ground handling.
- The National Weather Service kept a winter-storm warning active for the D.C. region through 4 a.m. Monday; travel advisories and road treatments were ongoing.
- Preliminary submissions contain duplicates and minor discrepancies (see Unconfirmed); final verified totals may differ after quality checks.
Background
Late Saturday into Sunday a coastal-inland precipitation gradient developed as a low-pressure system moved near the mid-Atlantic, producing a mix of snow and sleet across Northern Virginia. The storm brought widespread accumulation to both suburban and urban locations; colder inland pockets generally saw higher snow-to-sleet ratios. Local emergency management offices and transportation agencies had been preparing since the forecast models began indicating a wintry event several days earlier.
National Weather Service offices collect preliminary spot reports from trained spotters, automated stations and local governments; those early numbers are distributed to the public while technicians perform validation. Winter-storm warnings are issued when hazardous winter weather is expected to pose significant impacts to travel and safety. The D.C.-area warning covered the full metropolitan footprint and remained in place through the pre-dawn hours of Monday.
Main Event
The precipitation began late Saturday and intensified overnight, with most accumulation occurring between late Saturday evening and Sunday afternoon. Measurements reported to the NWS by 4:30 p.m. Sunday showed the largest single reading in Vienna at 8.0 inches. Surrounding Fairfax County locations also ranked near the top, with Herndon and several I-395/I-495 corridor reports above 6 inches.
Loudoun and Prince William counties recorded some of the higher totals outside Fairfax: Ashburn posted 7.8 inches while Dumfries reported 7.3 inches. Alexandria and Leesburg recorded amounts near 7 inches, and several interior and suburban stations reported totals in the mid-5 to mid-6 inch range. Dulles International and Reagan National airports were both measured in the 5–6 inch range, a level that typically requires runway clearing and operational adjustments.
Road crews applied salt and traction materials where conditions allowed, but sleet mixed with snow created compacted and glazed surfaces in many spots. Local authorities urged residents to avoid nonessential travel until primary routes were treated and cleared; municipal crews prioritized major arteries and transit-critical routes first.
Analysis & Implications
The 4–8 inch range across most of Northern Virginia is significant for a single event because sleet mixed with snow increases road-surface compaction and early icing risk, often leading to prolonged hazardous travel even after snowfall tapers. Municipal budgets and public works schedules can be strained by consecutive storm responses; crews must balance plowing, sanding and damage assessments. Power outages in isolated areas are possible where sleet adds weight to tree limbs and infrastructure, though there were no widespread outage reports in preliminary data.
Airport reports in the 5–6 inch range (Reagan National and Dulles) typically prompt runway clearing, schedule disruptions and cascading delays; airlines and ground handlers frequently operate with reduced throughput during and immediately after such events. Transit agencies may impose speed restrictions on commuter rail and bus routes where overhead wires or slick rails are a concern, affecting peak travel the following morning.
From a forecasting and risk perspective, storms that produce mixed precipitation present verification challenges: radar and surface observations can differ, and preliminary totals rely on rapid field reports. Emergency managers therefore calibrate public messaging to emphasize evolving conditions, and agencies may adjust restrictions or reopenings as final totals are verified and road conditions improve.
Comparison & Data
| Location | Preliminary Total (in.) |
|---|---|
| Vienna (Fairfax County) | 8.0 |
| Ashburn (Loudoun County) | 7.8 |
| Herndon (Fairfax County) | 7.6 |
| Dumfries (Prince William County) | 7.3 |
| Alexandria | 7.0 |
| Dulles International Airport | 6.2 |
| Reagan National Airport | 5.3 |
The table highlights selected high and representative totals from the NWS preliminary submissions. These figures show a clear clustering of higher totals in western and central Fairfax and Loudoun counties, with generally lower amounts nearer the Potomac and coastal plain. Final validated totals may adjust some values after quality control of submitted observations.
Reactions & Quotes
“A winter-storm warning remains in effect for the region through 4 a.m. Monday; hazardous travel is expected.”
National Weather Service (official advisory)
“Crews are prioritizing major arterials and transit routes; residents should delay travel where possible until surfaces are treated.”
Local transportation official (agency advisory)
Unconfirmed
- Some entries in the preliminary list appear duplicated or inconsistent (for example, Leesburg appears with 7.1 and 6.9 inches; Herndon appears twice with different values). These will be reconciled during NWS verification.
- Localized power outage counts and exact roadway closure durations were not available in the preliminary NWS submission window and remain subject to local utility and transportation agency follow-up.
Bottom Line
This weekend’s storm left most of Northern Virginia with measurable snow and sleet, with Vienna recording the highest preliminary total at 8.0 inches. The mix of sleet and snow increased travel hazards and complicated response efforts, meaning road and flight disruptions were likely to continue into the morning after the event.
Residents should refer to official NWS updates and local transportation advisories for final totals and safety guidance; preliminary reports give an early picture but are often adjusted after thorough verification. Planning for lingering icy spots, potential localized outages and delayed commutes remains prudent as cleanup continues.
Sources
- InsideNoVa — Local news outlet (initial compilation of NWS-reported preliminary totals)
- National Weather Service — NWS Baltimore/Washington office (official advisories and preliminary reports)