Piedmont Triad International to Harrisburg International GSO → MDT
288 nautical miles (331 statute miles) northeast on a straight line, true course 030°, about 038° magnetic at the departure end (variation 8W). At 120 knots that is 1 h 47 min at the quickest height in today's winds (34,000 ft, a 42-knot tailwind), arriving about 3:45 am EDT (07:45 UTC), after sunset at the destination. Right now GSO is VFR, wind from the west-southwest (250°) at 8 knots; MDT is marginal VFR, wind variable at 3 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: 7 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 TANGO 5W: moderate turbulence below 18,000 ft (due to mountain wave) up to 10,000 ft. Over the first 109 nm of the route.
- AIRMET SIERRA 3E: low cloud or poor visibility (IFR conditions) (due to ceilings below 1,000 ft, visibility below 3 miles, precipitation, mist). Over the last 208 nm of the route.
- AIRMET TANGO 3W: moderate turbulence above 18,000 ft from 21,000 ft to 33,000 ft. Over the last 208 nm of the route.
- AIRMET SIERRA 4E: mountains obscured by cloud (due to mountains obscured by clouds, precipitation, mist). Near the route, at the destination end.
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 GSO.
Pilot reports along the route within 50 nm of the line, last three hours, the serious ones first
- B38M at 20,000 ft, 8 nm northwest, 11:11 pm EDT (03:11 UTC): moderate clear-air turbulence from 20,000 ft to 25,000 ft. 199 nm along the route, 8 nm northwest of the line.
as filed, and in English
IAD UA /OV AML300020/TM 0311/FL200/TP B38M/TB MOD CAT 200-250
- Report
- a routine report filed through IAD
- Where
- 20 nm northwest (300°) of AML
- Time
- 03:11 UTC
- Height
- at 20,000 ft
- Aircraft
- B38M
- Turbulence
- moderate clear-air turbulence from 20,000 ft to 25,000 ft
- B712 descending, 36 nm southeast, 11:10 pm EDT (03:10 UTC): remarks: light rain light chop bases 50,000 ft ft. 238 nm along the route, 36 nm southeast of the line.
as filed, and in English
BWI UA /OV RWY 15R/TM 0310/FLDURD/TP B712/RM LIGHT RAIN. LIGHT CHOP. BASES 500 FT
- Report
- a routine report filed through BWI
- Where
- runway 15R
- Time
- 03:10 UTC
- Height
- during the descent
- Aircraft
- B712
- Remarks
- light rain light chop bases 50,000 ft ft
- E145 at 600 ft, 0 nm northeast, 11:20 pm EDT (03:20 UTC): overcast above 600 ft. At the destination end, 0 nm northeast of the line.
as filed, and in English
MDT UA /OV MDT/TM 0320/FL006/TP E145/SK OVC 006
- Report
- a routine report filed through MDT
- Where
- over MDT
- Time
- 03:20 UTC
- Height
- at 600 ft
- Aircraft
- E145
- Sky
- overcast from 600 ft
Winds aloft along the route, and the time en route the forecast for use 02:00–09:00 UTC · at 120 knots true airspeed
The eastbound cruising heights for this course (VFR: odd 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 (ROA, RIC, PSB). A plus sign is a headwind, a minus sign a tailwind.
| Height | Average wind | Head- or tailwind | Temperature | Ground speed | Time en route | Arrival |
|---|---|---|---|---|---|---|
| 3,500 ft | 300° at 24 kt | −2 kt | 122 kt | 2 h 22 min | 4:20 am EDT (08:20 UTC) | |
| 5,500 ft | 320° at 19 kt | +5 kt | 13 °C | 115 kt | 2 h 30 min | 4:28 am EDT (08:28 UTC) |
| 7,500 ft | 320° at 18 kt | +6 kt | 10 °C | 114 kt | 2 h 32 min | 4:30 am EDT (08:30 UTC) |
| 9,500 ft | 310° at 17 kt | +4 kt | 6 °C | 116 kt | 2 h 29 min | 4:27 am EDT (08:27 UTC) |
| 11,500 ft | 300° at 15 kt | −1 kt | 4 °C | 121 kt | 2 h 23 min | 4:21 am EDT (08:21 UTC) |
| 13,500 ft | 280° at 16 kt | −5 kt | 0 °C | 125 kt | 2 h 18 min | 4:16 am EDT (08:16 UTC) |
| 15,500 ft | 280° at 19 kt | −8 kt | -3 °C | 128 kt | 2 h 15 min | 4:13 am EDT (08:13 UTC) |
| 17,500 ft | 270° at 22 kt | −11 kt | -8 °C | 131 kt | 2 h 12 min | 4:10 am EDT (08:10 UTC) |
| 18,000 ft FL180 | 270° at 22 kt | −12 kt | -9 °C | 132 kt | 2 h 11 min | 4:09 am EDT (08:09 UTC) |
| 24,000 ft FL240 | 250° at 31 kt | −25 kt | -21 °C | 145 kt | 1 h 59 min | 3:57 am EDT (07:57 UTC) |
| 30,000 ft FL300 | 250° at 38 kt | −32 kt | -32 °C | 152 kt | 1 h 54 min | 3:52 am EDT (07:52 UTC) |
| 34,000 ft FL340 | 240° at 49 kt | −42 kt | -39 °C | 162 kt | 1 h 47 min | 3:45 am EDT (07:45 UTC) |
| 39,000 ft FL390 | 250° at 45 kt | −38 kt | -48 °C | 158 kt | 1 h 49 min | 3:47 am EDT (07:47 UTC) |
Based on data from the 12th at 00:00 UTC; valid on the 12th at 06:00 UTC for use 02:00 to 09:00 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 |
|---|---|---|---|---|---|---|---|---|---|---|
| ROA | used from 0 nm out; 54 nm from the line | 310/29 | 330/31 13° | 340/28 7° | 330/25 3° | 310/32 -8° | 300/32 -22° | 290/32 -31° | 270/35 -38° | 270/32 -47° |
| RIC | used from 99 nm out; 65 nm from the line | 270/23 | 280/19 11° | 270/18 8° | 240/22 4° | 230/39 -7° | 220/55 -18° | 220/75 -30° | 230/83 -39° | 230/64 -50° |
| PSB | used from 199 nm out; 100 nm from the line | 360/13 13° | 330/14 7° | 300/11 3° | 290/12 -11° | 240/23 -23° | 270/25 -36° | 250/34 -40° | 250/45 -48° |
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 |
|---|---|---|---|---|---|---|---|
| GSO Greensboro, NC | departure | VFR Sky: a few clouds at 4,000 feet, a few clouds at 7,000 feet | from the west-southwest (250°) at 8 knots | 10+ mi | none | 925 ft | 1:54 am EDT (05:54 UTC) |
| SIF Reidsville, NC | 20 nm out, 6 nm northwest of the line | VFR Sky: scattered clouds at 3,800 feet | from the southwest (220°) at 3 knots | 10+ mi | none | 693 ft | 05:35 UTC |
| LYH Lynchburg, VA | 79 nm out, 7 nm northwest of the line, tower | VFR Sky: a few clouds at 4,000 feet, a broken layer at 9,500 feet, a broken layer at 12,000 feet | from the south-southwest (200°) at 4 knots | 10+ mi | 9,500 ft | 938 ft | 05:54 UTC |
| FVX Farmville, VA | 99 nm out, 23 nm southeast of the line | IFR Sky: a broken layer at 700 feet, overcast at 3,200 feet | calm | 10+ mi | 700 ft | 415 ft | 05:35 UTC |
| CHO Charlottesville, VA | 139 nm out, 3 nm north of the line, tower | VFR Sky: overcast at 3,300 feet Weather: light rain | calm | 10+ mi | 3,300 ft | 640 ft | 05:53 UTC |
| HEF Washington, DC | 199 nm out, 18 nm southeast of the line, tower | IFR Sky: overcast at 700 feet | from the northwest (310°) at 8 knots | 3 mi | 700 ft | 192 ft | 04:56 UTC |
| FDK Frederick, MD | 238 nm out, 5 nm south of the line, tower | IFR Sky: overcast at 800 feet Weather: light rain | from the north (010°) at 8 knots | 10+ mi | 800 ft | 308 ft | 05:35 UTC |
| THV York, PA | 268 nm out, 6 nm east of the line | IFR Sky: overcast at 500 feet Weather: mist | from the northeast (040°) at 6 knots | 5 mi | 500 ft | 494 ft | 05:32 UTC |
| MDT Harrisburg, PA | destination | marginal VFR Sky: overcast at 1,000 feet | variable at 3 knots | 10+ mi | 1,000 ft | 310 ft | 1:08 am EDT (05:08 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 MDT when you get there the forecast at the estimated arrival, 3:45 am EDT (07:45 UTC)
Wind light and variable, visibility more than 6 miles, scattered clouds at 700 feet, overcast at 1,000 feet marginal VFR
The whole forecast for MDT
- From Mon 2:00 am EDT (06:00 UTC): wind light and variable, visibility more than 6 miles, scattered clouds at 700 feet, overcast at 1,000 feet
- From Mon 8:00 am EDT (12:00 UTC): wind from the north-northwest at 10 knots, visibility 6 miles, mist, scattered clouds at 1,500 feet, overcast at 4,000 feet
- From Mon 10:00 am EDT (14:00 UTC): wind from the northwest at 10 knots, visibility more than 6 miles, a broken layer at 2,500 feet, overcast at 4,000 feet
- From Mon 2:00 pm EDT (18:00 UTC): wind from the northwest at 8 knots, visibility more than 6 miles, a broken layer at 4,000 feet
- From Mon 5:00 pm EDT (21:00 UTC): wind from the west-northwest at 4 knots, visibility more than 6 miles, a broken layer at 25,000 feet
The forecast for GSO, the departure
- 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
Temporary flight restrictions on the line or within 25 nm of it
- 4/9383 WASHINGTON, DC., USA 18 nm from the route, 218 nm along the route · security · ZDC
- 6/8600 Sterling, VA, Monday, October 12, 2026 through Monday, October 12, 2026 Local 9 nm from the route, 218 nm along the route · a VIP movement · today · ZDC
Daylight
Sunset at GSO 6:48 pm EDT (22:48 UTC), at MDT 6:32 pm EDT (22:32 UTC) (civil twilight ends 6:59 pm EDT (22:59 UTC)). At 120 knots the arrival at MDT is before sunrise there (7:14 am EDT (11:14 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: Piedmont Triad International, Harrisburg International.