Washington Dulles International to Piedmont Triad International IAD → GSO
208 nautical miles (239 statute miles) southwest on a straight line, true course 215°, about 225° magnetic at the departure end (variation 10W). At 120 knots that is 1 h 30 min at the quickest height in today's winds (8,500 ft, a 18-knot tailwind), arriving about 6:34 am EDT (10:34 UTC), after sunset at the destination. Right now IAD is marginal VFR, wind from the north-northwest (330°) at 11 knots; GSO is VFR, wind from the west (270°) at 6 knots. For planning, not a briefing: the legal preflight briefing comes from Flight Service (1-800-WX-BRIEF) or the FAA's own tools. Airlines fly this pair: 1,552 flights in the DOT's last twelve reported months, the route's page.
The route the straight line, the warnings crossed, restrictions, pilot reports and the airports along the way · click a mark for its words
Green, blue, red and purple airport dots are the flying conditions reported there now (VFR, marginal VFR, IFR, low IFR); grey means no report. Red areas are SIGMETs, orange areas AIRMETs, hatched red areas temporary flight restrictions. Map tiles: OpenFreeMap, data © OpenStreetMap contributors.
Warnings the route crosses SIGMETs and AIRMETs whose area the line passes through or comes within 25 nm of
- AIRMET SIERRA 3E: low cloud or poor visibility (IFR conditions) (due to ceilings below 1,000 ft, visibility below 3 miles, precipitation, mist, fog). Over the first 138 nm of the route.
- AIRMET TANGO 3W: moderate turbulence below 18,000 ft (due to mountain wave) up to 6,000 ft. Over the first 198 nm of the route.
A SIGMET warns of weather hazardous to all aircraft; an AIRMET of weather that matters to small aircraft and to flying without instruments. "From 60 to 180 nm out" is measured along the route from IAD.
Pilot reports along the route within 50 nm of the line, last three hours, the serious ones first
- B737 at 800 ft, 39 nm east, 3:30 am EDT (07:30 UTC): remarks: bases 800 ft. At the departure end, 39 nm east of the line.
as filed, and in English
BWI UA /OV BWI/TM 0730/FL008/TP B737/RM BASES 008
- Report
- a routine report filed through BWI
- Where
- over BWI
- Time
- 07:30 UTC
- Height
- at 800 ft
- Aircraft
- B737
- Remarks
- bases 800 ft
Winds aloft along the route, and the time en route the forecast for use 08:00–15:00 UTC · at 120 knots true airspeed
The westbound cruising heights for this course (VFR: even thousands plus 500 ft; above 18,000 ft the forecast levels), with the wind averaged along the line from the 3 forecast points nearest it (RIC, ROA, RDU). A plus sign is a headwind, a minus sign a tailwind.
| Height | Average wind | Head- or tailwind | Temperature | Ground speed | Time en route | Arrival |
|---|---|---|---|---|---|---|
| 4,500 ft | 340° at 30 kt | −15 kt | 135 kt | 1 h 32 min | 6:36 am EDT (10:36 UTC) | |
| 6,500 ft | 340° at 29 kt | −17 kt | 12 °C | 137 kt | 1 h 31 min | 6:35 am EDT (10:35 UTC) |
| 8,500 ft | 340° at 30 kt | −18 kt | 9 °C | 138 kt | 1 h 30 min | 6:34 am EDT (10:34 UTC) |
| 10,500 ft | 340° at 29 kt | −16 kt | 6 °C | 136 kt | 1 h 32 min | 6:36 am EDT (10:36 UTC) |
| 12,500 ft | 330° at 28 kt | −13 kt | 2 °C | 133 kt | 1 h 34 min | 6:38 am EDT (10:38 UTC) |
| 14,500 ft | 330° at 31 kt | −13 kt | -2 °C | 133 kt | 1 h 34 min | 6:38 am EDT (10:38 UTC) |
| 16,500 ft | 330° at 34 kt | −14 kt | -5 °C | 134 kt | 1 h 33 min | 6:37 am EDT (10:37 UTC) |
| 18,000 ft FL180 | 330° at 36 kt | −14 kt | -8 °C | 134 kt | 1 h 33 min | 6:37 am EDT (10:37 UTC) |
| 24,000 ft FL240 | 330° at 42 kt | −19 kt | -20 °C | 139 kt | 1 h 30 min | 6:34 am EDT (10:34 UTC) |
| 30,000 ft FL300 | 330° at 44 kt | −19 kt | -34 °C | 139 kt | 1 h 30 min | 6:34 am EDT (10:34 UTC) |
| 34,000 ft FL340 | 330° at 44 kt | −17 kt | -39 °C | 137 kt | 1 h 31 min | 6:35 am EDT (10:35 UTC) |
| 39,000 ft FL390 | 300° at 42 kt | +3 kt | -47 °C | 117 kt | 1 h 47 min | 6:51 am EDT (10:51 UTC) |
Based on data from the 12th at 06:00 UTC; valid on the 12th at 12:00 UTC for use 08:00 to 15:00 UTC; temperatures above 24,000 ft are below zero. Heights are above sea level; a height is left out when the forecast has no wind for it over most of the line (the ground is higher). Ground speed is the airspeed less the headwind; the time en route is for the straight line and ignores climb, descent and routing around weather.
The forecast points as issued
| Point | From | 3,000 | 6,000 | 9,000 | 12,000 | 18,000 | 24,000 | 30,000 | 34,000 | 39,000 |
|---|---|---|---|---|---|---|---|---|---|---|
| RIC | used from 0 nm out; 70 nm from the line | 350/34 | 340/27 12° | 340/36 8° | 330/31 3° | 310/32 -9° | 320/34 -21° | 300/37 -34° | 290/37 -39° | 290/42 -46° |
| ROA | used from 99 nm out; 49 nm from the line | 310/32 | 340/32 14° | 350/25 9° | 340/24 3° | 340/42 -8° | 340/52 -20° | 350/62 -34° | 350/64 -39° | 310/44 -48° |
| RDU | used from 198 nm out; 56 nm from the line | 330/30 | 340/24 12° | 330/26 7° | 320/30 3° | 330/39 -8° | 310/30 -20° | 300/33 -33° | 310/34 -39° | 310/41 -47° |
The weather now: both ends and the airports along the way public airports with a weather report within 25 nm of the line, one for each stretch
| Airport | Where | Conditions | Wind | Visibility | Ceiling | Elevation | Reported |
|---|---|---|---|---|---|---|---|
| IAD Washington, DC | departure | marginal VFR Sky: a broken layer at 1,000 feet, a broken layer at 1,500 feet, overcast at 3,000 feet Weather: mist | from the north-northwest (330°) at 11 knots | 6 mi | 1,000 ft | 312 ft | 4:52 am EDT (08:52 UTC) |
| CJR Culpeper, VA | 30 nm out, 2 nm southwest of the line | VFR Sky: scattered clouds at 4,000 feet, a broken layer at 11,000 feet | from the north-northeast (020°) at 3 knots | 10+ mi | 11,000 ft | 315 ft | 08:55 UTC |
| CHO Charlottesville, VA | 69 nm out, 11 nm northwest of the line, tower | marginal VFR Sky: a broken layer at 3,000 feet, a broken layer at 9,500 feet, a broken layer at 11,000 feet | calm | 10+ mi | 3,000 ft | 640 ft | 08:53 UTC |
| FVX Farmville, VA | 109 nm out, 18 nm east of the line | VFR | calm | 10+ mi | none | 415 ft | 08:55 UTC |
| LYH Lynchburg, VA | 129 nm out, 12 nm northwest of the line, tower | VFR | calm | 10+ mi | none | 938 ft | 08:54 UTC |
| SIF Reidsville, NC | 188 nm out, 8 nm northwest of the line | VFR | calm | 10+ mi | none | 693 ft | 08:55 UTC |
| GSO Greensboro, NC | destination | VFR Sky: a few clouds at 3,600 feet | from the west (270°) at 6 knots | 10+ mi | none | 925 ft | 4:54 am EDT (08:54 UTC) |
The highest airport on this list sits at 938 ft; the ground between airports is higher still. Check the sectional chart for the terrain and the minimum safe heights along the line.
At GSO when you get there the forecast at the estimated arrival, 6:34 am EDT (10:34 UTC)
Wind from the west at 9 knots, visibility more than 6 miles, scattered clouds at 4,000 feet, scattered clouds at 10,000 feet VFR
The whole forecast for GSO
- From Mon 2:00 am EDT (06:00 UTC): wind from the west at 9 knots, visibility more than 6 miles, scattered clouds at 4,000 feet, scattered clouds at 10,000 feet
- From Mon 10:00 am EDT (14:00 UTC): wind from the northwest at 11 knots, gusting to 19, visibility more than 6 miles, scattered clouds at 3,000 feet, a broken layer at 4,500 feet
- From Mon 5:30 pm EDT (21:30 UTC): wind from the northwest at 4 knots, visibility more than 6 miles, scattered clouds at 25,000 feet
The forecast for IAD, the departure
- From Mon 2:00 am EDT (06:00 UTC): wind from the north-northwest at 12 knots, visibility 5 miles, light rain, mist, overcast at 600 feet
- From Mon 8:00 am EDT (12:00 UTC): wind from the north-northwest at 10 knots, gusting to 18, visibility more than 6 miles, overcast at 1,000 feet
- From Mon 12:00 pm EDT (16:00 UTC): wind from the north-northwest at 13 knots, gusting to 21, visibility more than 6 miles, scattered clouds at 1,500 feet, overcast at 2,500 feet
- From Mon 2:00 pm EDT (18:00 UTC): wind from the north-northwest at 11 knots, gusting to 18, visibility more than 6 miles, scattered clouds at 2,500 feet, overcast at 3,500 feet
- From Mon 5:00 pm EDT (21:00 UTC): wind from the northwest at 7 knots, visibility more than 6 miles, a broken layer at 3,500 feet
- From Mon 8:00 pm EDT (00:00 UTC): wind from the west-northwest at 3 knots, visibility more than 6 miles, scattered clouds at 4,000 feet
Temporary flight restrictions on the line or within 25 nm of it
- 4/9383 WASHINGTON, DC., USA 8 nm from the route, at the departure end · security · ZDC
- 6/8600 Sterling, VA, Monday, October 12, 2026 through Monday, October 12, 2026 Local 4 nm from the route, at the departure end · a VIP movement · today · ZDC
Daylight
Sunset at IAD 6:36 pm EDT (22:36 UTC), at GSO 6:48 pm EDT (22:48 UTC) (civil twilight ends 7:13 pm EDT (23:13 UTC)). At 120 knots the arrival at GSO is before sunrise there (7:23 am EDT (11:23 UTC)).
Each restriction opens the FAA's own page with the exact area, heights and times. Ordinary notices to air missions (closed runways, lights out) are not shown: the FAA's notice search is not open to sites like this one at this time.
Radar and forecast charts for the regions crossed government pictures, the latest each time the page loads
Sources: the Aviation Weather Center's data service (SIGMETs, AIRMETs, graphical AIRMETs, pilot reports, winds and temperatures aloft, observations and terminal forecasts), the National Weather Service radar, the Weather Prediction Center's charts, the FAA's temporary flight restriction list and shapes, and the FAA's airport file for the positions, elevations and magnetic variation. Fetched when the page is viewed and kept a few minutes. Each leg is the straight line between its two airports; airways, terrain and airspace are not considered. The airports in detail: Washington Dulles International, Piedmont Triad International.