Piedmont Triad International to Robert Gray Army Airfield GSO → GRK
943 nautical miles (1,085 statute miles) west on a straight line, true course 256°, about 264° magnetic at the departure end (variation 8W). At 120 knots that is 8 h 30 min at the quickest height in today's winds (6,500 ft, a 9-knot headwind), arriving about 2:33 pm CDT (19:33 UTC). Right now GSO is VFR, wind from the west-southwest (250°) at 8 knots; GRK is marginal VFR, wind from the southeast (140°) 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 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 3W: low-level wind shear (due to air speed loss or gain of 20 knots or more below 2,000 ft above the ground). Over the first 89 nm of the route.
- AIRMET TANGO 5W: moderate turbulence above 18,000 ft (due to mountain wave) from 29,000 ft to 40,000 ft. Over the route from 40 to 198 nm out.
- AIRMET TANGO 3W: moderate turbulence below 18,000 ft (due to mountain wave) up to 6,000 ft. Over the route from 40 to 189 nm out.
- AIRMET SIERRA 4E: mountains obscured by cloud (due to mountains obscured by clouds, mist). Over the route from 99 to 248 nm out.
- 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 route from 139 to 268 nm out.
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
- CRJ9 at 6,000 ft, 48 nm north, 6:10 am EDT (10:10 UTC): a broken layer from 4,600 ft to 5,800 ft. 119 nm along the route, 48 nm north of the line.
as filed, and in English
TRI UA /OV BOOIE/TM 1010/FL060/TP CRJ9/SK BKN046-TOP058
- Report
- a routine report filed through TRI
- Where
- booie
- Time
- 10:10 UTC
- Height
- at 6,000 ft
- Aircraft
- CRJ9
- Sky
- a broken layer from 4,600 ft, tops 5,800 ft
- A319 at 19,000 ft, 41 nm south, 6:42 am EDT (10:42 UTC): no turbulence, remarks: ztlfd 49. 179 nm along the route, 41 nm south of the line.
as filed, and in English
ATL UA /OV ODF/TM 1042/FL190/TP A319/TB NEG/RM ZTLFD 49
- Report
- a routine report filed through ATL
- Where
- over ODF
- Time
- 10:42 UTC
- Height
- at 19,000 ft
- Aircraft
- A319
- Turbulence
- none
- Remarks
- ztlfd 49
- B38M at 35,000 ft, 16 nm southeast, 6:04 am EDT (10:04 UTC): light turbulence, remarks: ztlfd 39. 248 nm along the route, 16 nm southeast of the line.
as filed, and in English
ATL UA /OV GQO110025/TM 1004/FL350/TP B38M/TB LGT/RM ZTLFD 39
- Report
- a routine report filed through ATL
- Where
- 25 nm east (110°) of GQO
- Time
- 10:04 UTC
- Height
- at 35,000 ft
- Aircraft
- B38M
- Turbulence
- light
- Remarks
- ztlfd 39
- CRJ9 at 1,000 ft, 6 nm north, 6:15 am EDT (10:15 UTC): remarks: during the climb runway 20 departure. 268 nm along the route, 6 nm north of the line.
as filed, and in English
CHA UA /OV CHA/TM 1015/FL010/TP CRJ9/SK TOP010/RM DURC. RY 20 DEPARTURE
- Report
- a routine report filed through CHA
- Where
- over CHA
- Time
- 10:15 UTC
- Height
- at 1,000 ft
- Aircraft
- CRJ9
- Sky
- TOP010
- Remarks
- during the climb runway 20 departure
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 11 forecast points nearest it (RDU, TRI, GSP, TYS, HSV, MEM, JAN, LIT, SHV, DAL, CLL). 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 | 270° at 10 kt | +10 kt | 11 °C | 110 kt | 8 h 34 min | 2:37 pm CDT (19:37 UTC) |
| 6,500 ft | 280° at 10 kt | +9 kt | 15 °C | 111 kt | 8 h 30 min | 2:33 pm CDT (19:33 UTC) |
| 8,500 ft | 300° at 12 kt | +9 kt | 12 °C | 111 kt | 8 h 30 min | 2:33 pm CDT (19:33 UTC) |
| 10,500 ft | 300° at 13 kt | +9 kt | 8 °C | 111 kt | 8 h 30 min | 2:33 pm CDT (19:33 UTC) |
| 12,500 ft | 300° at 14 kt | +9 kt | 5 °C | 111 kt | 8 h 30 min | 2:33 pm CDT (19:33 UTC) |
| 14,500 ft | 300° at 15 kt | +10 kt | 1 °C | 110 kt | 8 h 34 min | 2:37 pm CDT (19:37 UTC) |
| 16,500 ft | 300° at 17 kt | +11 kt | -3 °C | 109 kt | 8 h 39 min | 2:42 pm CDT (19:42 UTC) |
| 18,000 ft FL180 | 300° at 18 kt | +12 kt | -6 °C | 108 kt | 8 h 44 min | 2:47 pm CDT (19:47 UTC) |
| 24,000 ft FL240 | 300° at 19 kt | +12 kt | -17 °C | 108 kt | 8 h 44 min | 2:47 pm CDT (19:47 UTC) |
| 30,000 ft FL300 | 310° at 35 kt | +17 kt | -31 °C | 103 kt | 9 h 09 min | 3:12 pm CDT (20:12 UTC) |
| 34,000 ft FL340 | 320° at 40 kt | +16 kt | -40 °C | 104 kt | 9 h 04 min | 3:07 pm CDT (20:07 UTC) |
| 39,000 ft FL390 | 320° at 38 kt | +12 kt | -50 °C | 108 kt | 8 h 44 min | 2:47 pm CDT (19:47 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 |
|---|---|---|---|---|---|---|---|---|---|---|
| RDU | used from 0 nm out; 81 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° |
| TRI | used from 50 nm out; 62 nm from the line | 340/25 11° | 350/37 9° | 350/34 6° | 340/39 -7° | 340/43 -19° | 340/55 -32° | 330/58 -42° | 320/37 -50° | |
| GSP | used from 99 nm out; 43 nm from the line | 340/30 | 360/24 13° | 350/29 10° | 340/33 6° | 340/40 -7° | 350/44 -19° | 340/59 -31° | 350/55 -41° | 300/29 -50° |
| TYS | used from 149 nm out; 40 nm from the line | 330/16 | 350/32 14° | 350/37 9° | 340/30 5° | 330/28 -6° | 340/36 -19° | 330/40 -33° | 330/51 -41° | 330/36 -51° |
| HSV | used from 248 nm out; 73 nm from the line | 300/20 | 310/14 16° | 310/18 10° | 310/15 4° | 320/19 -5° | 290/16 -18° | 320/36 -32° | 320/47 -41° | 330/42 -50° |
| MEM | used from 447 nm out; 80 nm from the line | 250/19 | 260/19 17° | 270/20 12° | 270/16 6° | 270/21 -6° | 290/27 -17° | 300/37 -30° | 300/49 -40° | 310/40 -51° |
| JAN | used from 496 nm out; 80 nm from the line | 240/10 | 260/15 18° | 280/10 11° | 290/6 6° | 290/15 -5° | 300/15 -17° | 320/35 -30° | 330/38 -40° | 330/39 -51° |
| LIT | used from 595 nm out; 100 nm from the line | 250/22 | 250/25 18° | 240/23 12° | 240/20 7° | 250/17 -6° | 260/25 -17° | 300/45 -29° | 300/49 -40° | 310/43 -51° |
| SHV | used from 645 nm out; 52 nm from the line | 210/20 | 210/20 18° | 230/20 11° | 240/16 7° | 270/17 -7° | 250/11 -15° | 300/34 -30° | 310/34 -40° | 320/36 -51° |
| DAL | used from 794 nm out; 86 nm from the line | 190/30 | 200/28 18° | 220/18 13° | 250/13 8° | 240/24 -6° | 270/20 -14° | 270/35 -29° | 290/34 -39° | 310/41 -51° |
| CLL | used from 843 nm out; 58 nm from the line | 180/24 | 170/21 19° | 180/10 14° | 230/7 8° | 230/16 -6° | 260/20 -13° | 290/23 -29° | 320/21 -39° | 340/35 -51° |
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 3,400 feet, a few clouds at 12,000 feet | from the west-southwest (250°) at 8 knots | 10+ mi | none | 925 ft | 6:54 am EDT (10:54 UTC) |
| HKY Hickory, NC | 69 nm out, 6 nm southwest of the line, tower | VFR | from the west (280°) at 3 knots | 10+ mi | none | 1,189 ft | 10:53 UTC |
| AVL Asheville, NC | 129 nm out, 8 nm south of the line, tower | marginal VFR Sky: a broken layer at 1,300 feet, overcast at 1,700 feet | variable at 4 knots | 10+ mi | 1,300 ft | 2,163 ft | 10:54 UTC |
| CHA Chattanooga, TN | 268 nm out, 6 nm north of the line, tower | low IFR Sky: sky obscured at 200 feet Weather: fog | calm | 0.13 mi | 200 ft | 682 ft | 10:53 UTC |
| HSV Huntsville, AL | 347 nm out, 5 nm north of the line, tower | VFR Sky: a few clouds at 15,000 feet | calm | 10+ mi | none | 628 ft | 10:53 UTC |
| TUP Tupelo, MS | 447 nm out, 15 nm north of the line, tower | VFR Weather: mist | calm | 6 mi | none | 346 ft | 10:53 UTC |
| GWO Greenwood, MS | 526 nm out, 8 nm southeast of the line, tower | VFR | from the south (190°) at 3 knots | 10+ mi | none | 162 ft | 10:53 UTC |
| GLH Greenville, MS | 566 nm out, 6 nm northwest of the line, tower | VFR | from the southwest (230°) at 5 knots | 10+ mi | none | 130 ft | 10:53 UTC |
| SHV Shreveport, LA | 724 nm out, 3 nm east of the line, tower | VFR | from the south-southeast (160°) at 5 knots | 10+ mi | none | 257 ft | 10:56 UTC |
| GGG Longview, TX | 764 nm out, 12 nm northwest of the line, tower | VFR | from the south (180°) at 5 knots | 10+ mi | none | 365 ft | 10:53 UTC |
| CNW Waco, TX | 893 nm out, 16 nm northwest of the line, tower | VFR | from the southeast (140°) at 5 knots | 10+ mi | none | 470 ft | 10:55 UTC |
| GRK Fort Hood (Killeen), TX | destination | marginal VFR Sky: a broken layer at 2,400 feet | from the southeast (140°) at 6 knots | 9 mi | 2,400 ft | 1,015 ft | 5:55 am CDT (10:55 UTC) |
The highest airport on this list sits at 2,163 ft; the ground between airports is higher still. Check the sectional chart for the terrain and the minimum safe heights along the line.
At GRK when you get there the forecast at the estimated arrival, 2:33 pm CDT (19:33 UTC)
Wind from the south-southeast at 9 knots, a broken layer at 1,500 feet marginal VFR
The whole forecast for GRK
- From Mon 3:00 am CDT (08:00 UTC): wind from the south-southeast at 9 knots, a broken layer at 1,500 feet
- Changing between Mon 11:00 am CDT (16:00 UTC) and 12:00 pm CDT (17:00 UTC) to: wind from the south-southeast at 9 knots, a broken layer at 5,000 feet
- Changing between Mon 5:00 pm CDT (22:00 UTC) and 6:00 pm CDT (23:00 UTC) to: wind from the south-southeast at 9 knots, a broken layer at 10,000 feet
- Changing between Mon 10:00 pm CDT (03:00 UTC) and 11:00 pm CDT (04:00 UTC) to: wind from the south-southeast at 9 knots, a broken layer at 1,000 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
- 6/8926 Tyler, TX, Tuesday, October 13, 2026 Local 18 nm from the route, 794 nm along the route · a VIP movement · starts tomorrow · ZFW
- 6/0543 MCGREGOR, TX 10 nm from the route, at the destination end · security · ZFW
Daylight
Sunset at GSO 6:48 pm EDT (22:48 UTC), at GRK 7:02 pm CDT (00:02 UTC) (civil twilight ends 7:26 pm CDT (00:26 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, Robert Gray Army Airfield.