Seattle-Tacoma International to Robert Gray Army Airfield SEA → GRK
1,493 nautical miles (1,718 statute miles) southeast on a straight line, true course 122°, about 106° magnetic at the departure end (variation 16E). At 120 knots that is 10 h 49 min at the quickest height in today's winds (39,000 ft, a 18-knot tailwind), arriving about 6:54 am CDT (11:54 UTC), after sunset at the destination. Right now SEA is VFR, wind from the north (350°) at 11 knots; GRK is VFR, wind from the south-southeast (160°) at 4 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 ZULU 2C: moderate icing up to 14,000 ft. Over the route from 109 to 289 nm out.
- AIRMET SIERRA 1E: mountains obscured by cloud (due to mountains obscured by clouds, precipitation, mist). Over the route from 169 to 886 nm out.
- AIRMET TANGO 4W: moderate turbulence above 18,000 ft from 18,000 ft to 36,000 ft. Over the route from 279 to 935 nm out.
- AIRMET ZULU 3C: moderate icing up to 22,000 ft. Over the route from 358 to 697 nm out.
- AIRMET SIERRA 4E: low cloud or poor visibility (IFR conditions) (due to ceilings below 1,000 ft, visibility below 3 miles, precipitation, mist). Over the route from 368 to 557 nm out.
- AIRMET TANGO 4W: moderate turbulence below 18,000 ft up to 18,000 ft. Over the route from 527 to 1045 nm out.
- AIRMET TANGO 1W: 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 route from 547 to 866 nm out.
- AIRMET TANGO 5W: strong surface winds (30 knots or more) (due to sustained surface winds greater than 30 knots). Over the route from 726 to 746 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 SEA.
Pilot reports along the route within 50 nm of the line, last three hours, the serious ones first
Not fetched just now.
Winds aloft along the route, and the time en route the forecast for use 20:00–03:00 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 13 forecast points nearest it (SEA, YKM, LWS, BOI, PIH, SLC, RKS, GJT, ALS, TCC, AMA, LBB, ABI). A plus sign is a headwind, a minus sign a tailwind.
| Height | Average wind | Head- or tailwind | Temperature | Ground speed | Time en route | Arrival |
|---|---|---|---|---|---|---|
| 5,500 ft | 200° at 7 kt | +3 kt | 13 °C | 117 kt | 12 h 46 min | 8:51 am CDT (13:51 UTC) |
| 7,500 ft | 210° at 13 kt | +4 kt | 6 °C | 116 kt | 12 h 52 min | 8:57 am CDT (13:57 UTC) |
| 9,500 ft | 220° at 16 kt | +3 kt | 4 °C | 117 kt | 12 h 46 min | 8:51 am CDT (13:51 UTC) |
| 11,500 ft | 220° at 22 kt | +3 kt | 1 °C | 117 kt | 12 h 46 min | 8:51 am CDT (13:51 UTC) |
| 13,500 ft | 220° at 25 kt | +3 kt | -2 °C | 117 kt | 12 h 46 min | 8:51 am CDT (13:51 UTC) |
| 15,500 ft | 220° at 28 kt | +3 kt | -7 °C | 117 kt | 12 h 46 min | 8:51 am CDT (13:51 UTC) |
| 17,500 ft | 220° at 31 kt | +3 kt | -10 °C | 117 kt | 12 h 46 min | 8:51 am CDT (13:51 UTC) |
| 18,000 ft FL180 | 220° at 31 kt | +3 kt | -11 °C | 117 kt | 12 h 46 min | 8:51 am CDT (13:51 UTC) |
| 24,000 ft FL240 | 220° at 35 kt | +1 kt | -21 °C | 119 kt | 12 h 33 min | 8:38 am CDT (13:38 UTC) |
| 30,000 ft FL300 | 230° at 45 kt | −3 kt | -31 °C | 123 kt | 12 h 08 min | 8:13 am CDT (13:13 UTC) |
| 34,000 ft FL340 | 240° at 49 kt | −13 kt | -37 °C | 133 kt | 11 h 14 min | 7:19 am CDT (12:19 UTC) |
| 39,000 ft FL390 | 240° at 48 kt | −18 kt | -46 °C | 138 kt | 10 h 49 min | 6:54 am CDT (11:54 UTC) |
Based on data from the 11th at 18:00 UTC; valid on the 12th at 00:00 UTC for use 20:00 to 03:00 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 |
|---|---|---|---|---|---|---|---|---|---|---|
| SEA | used from 0 nm out; 25 nm from the line | 360/9 | 350/10 1° | 010/10 -5° | 030/20 -11° | 020/60 -17° | 010/86 -26° | 360/90 -40° | 010/68 -42° | 360/31 -43° |
| YKM | used from 50 nm out; 16 nm from the line | 030/16 | 020/18 0° | 030/30 -8° | 030/23 -13° | 020/40 -23° | 010/73 -29° | 010/54 -36° | 360/29 -37° | 330/16 -40° |
| LWS | used from 149 nm out; 81 nm from the line | 010/5 | 050/14 -2° | 040/12 -6° | 160/7 -10° | 190/30 -22° | 200/54 -27° | 200/48 -35° | 210/40 -37° | 230/32 -41° |
| BOI | used from 249 nm out; 84 nm from the line | 330/14 4° | 230/5 -2° | 220/20 -7° | 210/37 -20° | 200/59 -26° | 200/67 -34° | 210/73 -35° | 220/62 -41° | |
| PIH | used from 398 nm out; 72 nm from the line | 270/10 | 270/13 1° | 210/16 -2° | 200/56 -11° | 200/51 -23° | 200/68 -33° | 220/77 -37° | 230/73 -44° | |
| SLC | used from 547 nm out; 64 nm from the line | 280/8 | 210/39 5° | 210/52 -1° | 200/50 -11° | 200/56 -23° | 220/61 -28° | 230/73 -37° | 230/73 -45° | |
| RKS | used from 647 nm out; 63 nm from the line | 190/43 | 210/65 3° | 210/57 -9° | 210/56 -21° | 210/47 -33° | 230/63 -37° | 240/77 -46° | ||
| GJT | used from 697 nm out; 67 nm from the line | 210/40 11° | 210/46 3° | 210/61 -10° | 210/68 -22° | 220/57 -29° | 230/59 -36° | 240/66 -46° | ||
| ALS | used from 846 nm out; 73 nm from the line | 210/32 5° | 230/48 -8° | 230/49 -20° | 230/78 -30° | 240/74 -36° | 240/61 -47° | |||
| TCC | used from 1045 nm out; 60 nm from the line | 200/26 | 200/28 14° | 220/25 7° | 230/28 -7° | 240/41 -19° | 240/62 -28° | 250/61 -37° | 250/49 -49° | |
| AMA | used from 1144 nm out; 28 nm from the line | 190/28 | 220/26 14° | 230/27 7° | 250/24 -6° | 250/32 -16° | 240/51 -28° | 250/52 -38° | 250/51 -50° | |
| LBB | used from 1194 nm out; 48 nm from the line | 180/26 20° | 210/21 13° | 230/21 7° | 250/25 -5° | 250/34 -16° | 250/52 -28° | 260/47 -38° | 260/49 -50° | |
| ABI | used from 1294 nm out; 53 nm from the line | 180/26 17° | 220/18 12° | 230/25 8° | 230/28 -5° | 240/29 -14° | 250/35 -28° | 270/37 -39° | 280/37 -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 |
|---|---|---|---|---|---|---|---|
| SEA Seattle, WA | departure | VFR Sky: a few clouds at 5,000 feet | from the north (350°) at 11 knots | 10+ mi | none | 432 ft | 5:53 pm PDT (00:53 UTC) |
| YKM Yakima, WA | 90 nm out, 5 nm southwest of the line, tower | VFR Sky: overcast at 9,000 feet | calm | 10+ mi | 9,000 ft | 1,098 ft | 00:53 UTC |
| PDT Pendleton, OR | 179 nm out, 8 nm southwest of the line, tower | VFR Sky: overcast at 6,000 feet | from the north-northeast (030°) at 3 knots | 10+ mi | 6,000 ft | 1,494 ft | 00:53 UTC |
| SUN Hailey, ID | 408 nm out, 4 nm east of the line, tower | marginal VFR Sky: scattered clouds at 300 feet, a broken layer at 1,300 feet, overcast at 2,200 feet Weather: light rain | from the east-southeast (120°) at 5 knots | 3 mi | 1,300 ft | 5,319 ft | 00:50 UTC |
| PIH Pocatello, ID | 488 nm out, 21 nm northeast of the line, tower | VFR Sky: scattered clouds at 1,200 feet, a broken layer at 6,000 feet, overcast at 8,500 feet Weather: light rain | from the southwest (230°) at 9 knots | 10+ mi | 6,000 ft | 4,451 ft | 00:53 UTC |
| VEL Vernal, UT | 697 nm out, 4 nm west of the line | VFR Sky: a broken layer at 8,000 feet, overcast at 11,000 feet Weather: light rain | from the southwest (220°) at 19 knots, gusting to 27 | 10+ mi | 8,000 ft | 5,274 ft | 00:53 UTC |
| ASE Aspen, CO | 836 nm out, 25 nm northeast of the line, tower | VFR Sky: a broken layer at 7,500 feet, overcast at 9,000 feet Weather: light rain | from the west-northwest (300°) at 12 knots, gusting to 15 | 10+ mi | 7,500 ft | 7,837 ft | 00:53 UTC |
| RTN Raton, NM | 1015 nm out, 6 nm southwest of the line | VFR Sky: a broken layer at 9,000 feet | from the south-southwest (210°) at 12 knots | 10+ mi | 9,000 ft | 6,352 ft | 00:53 UTC |
| HRX Hereford, TX | 1174 nm out, 11 nm southwest of the line | reported, no category | from the south (190°) at 14 knots, gusting to 17 | 10+ mi | none | 3,787 ft | 00:50 UTC |
| PVW Plainview, TX | 1224 nm out, 18 nm southwest of the line | VFR | from the south (180°) at 11 knots | 10+ mi | none | 3,374 ft | 00:55 UTC |
| ABI Abilene, TX | 1373 nm out, 16 nm southwest of the line, tower | VFR | from the south-southeast (160°) at 15 knots, gusting to 23 | 10+ mi | none | 1,790 ft | 00:52 UTC |
| GRK Fort Hood (Killeen), TX | destination | VFR | from the south-southeast (160°) at 4 knots | 10+ mi | none | 1,015 ft | 7:55 pm CDT (00:55 UTC) |
The highest airport on this list sits at 7,837 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, 6:54 am CDT (11:54 UTC)
Wind from the south-southeast at 9 knots, scattered clouds at 6,000 feet
The whole forecast for GRK
- From Sun 7:00 pm CDT (00:00 UTC): wind from the south-southeast at 9 knots, scattered clouds at 6,000 feet
- Changing between Mon 3:00 am CDT (08:00 UTC) and 4:00 am CDT (09:00 UTC) to: wind from the southeast at 6 knots, a broken layer at 1,500 feet
- Changing between Mon 4:00 pm CDT (21:00 UTC) and 5:00 pm CDT (22:00 UTC) to: wind from the south-southeast at 12 knots, a broken layer at 5,000 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 1,500 feet
The forecast for SEA, the departure
- From Sun 5:00 pm PDT (00:00 UTC): wind from the north at 12 knots, gusting to 20, visibility more than 6 miles, a few clouds at 2,000 feet, a few clouds at 5,000 feet
- From Sun 8:00 pm PDT (03:00 UTC): wind from the northeast at 6 knots, visibility more than 6 miles, clear skies
- From Mon 3:00 am PDT (10:00 UTC): wind from the southeast at 4 knots, visibility more than 6 miles, patches of fog, clear skies
- From Mon 9:00 am PDT (16:00 UTC): wind from the south-southeast at 4 knots, visibility more than 6 miles, clear skies
- From Mon 11:00 am PDT (18:00 UTC): wind from the west at 6 knots, visibility more than 6 miles, clear skies
- From Mon 8:00 pm PDT (03:00 UTC): wind from the northwest at 5 knots, visibility more than 6 miles, scattered clouds at 25,000 feet
Temporary flight restrictions on the line or within 25 nm of it
No temporary flight restriction on or near this route right now.
Daylight
Sunset at SEA 6:27 pm PDT (01:27 UTC), at GRK 7:03 pm CDT (00:03 UTC) (civil twilight ends 7:27 pm CDT (00:27 UTC)). At 120 knots the arrival at GRK is before sunrise there (7:31 am CDT (12:31 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: Seattle-Tacoma International, Robert Gray Army Airfield.