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 11 h 04 min at the quickest height in today's winds (34,000 ft, a 15-knot tailwind), arriving about 5:41 pm CDT (22:41 UTC). 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
- SIGMET W21W: thunderstorms (a convective SIGMET) up to 27,000 ft, moving from the southwest at 20 knots, until 5:55 am PDT (12:55 UTC). Over the route from 498 to 508 nm out.
as issued
WSUS33 KKCI 121055 MKCW WST 121055 CONVECTIVE SIGMET 21W VALID UNTIL 1255Z UT ID NV FROM 40ENE TWF-20SSE PIH-40E BVL-20WNW BVL-40ENE TWF AREA TS MOV FROM 24020KT. TOPS TO FL270.
- AIRMET TANGO 1W: moderate turbulence above 18,000 ft from 18,000 ft to 39,000 ft. Over the route from 30 to 318 nm out.
- AIRMET SIERRA 1E: mountains obscured by cloud (due to mountains obscured by clouds, precipitation, mist). Over the route from 169 to 846 nm out.
- AIRMET ZULU 2C: moderate icing up to 18,000 ft. Over the route from 199 to 299 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 309 to 508 nm out.
- AIRMET ZULU 2C: moderate icing up to 23,000 ft. Over the route from 338 to 806 nm out.
- AIRMET TANGO 1W: moderate turbulence below 18,000 ft (due to mountain wave) up to 12,000 ft. Over the route from 607 to 766 nm out.
- AIRMET TANGO 4W: moderate turbulence above 18,000 ft (due to mountain wave) from 34,000 ft to 43,000 ft. Over the route from 637 to 1055 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 736 to 806 nm out.
- AIRMET TANGO 2W: moderate turbulence below 18,000 ft (due to mountain wave) up to 22,000 ft. Over the route from 776 to 995 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 926 to 1025 nm out.
- AIRMET TANGO 2W: 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 1264 to 1343 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 08:00–15:00 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 | 220° at 10 kt | +1 kt | 13 °C | 119 kt | 12 h 33 min | 7:10 pm CDT (00:10 UTC) |
| 7,500 ft | 220° at 11 kt | +1 kt | 6 °C | 119 kt | 12 h 33 min | 7:10 pm CDT (00:10 UTC) |
| 9,500 ft | 220° at 11 kt | +1 kt | 4 °C | 119 kt | 12 h 33 min | 7:10 pm CDT (00:10 UTC) |
| 11,500 ft | 220° at 17 kt | 0 | 0 °C | 120 kt | 12 h 26 min | 7:03 pm CDT (00:03 UTC) |
| 13,500 ft | 220° at 21 kt | 0 | -3 °C | 120 kt | 12 h 26 min | 7:03 pm CDT (00:03 UTC) |
| 15,500 ft | 220° at 24 kt | +1 kt | -8 °C | 119 kt | 12 h 33 min | 7:10 pm CDT (00:10 UTC) |
| 17,500 ft | 220° at 28 kt | +2 kt | -12 °C | 118 kt | 12 h 39 min | 7:16 pm CDT (00:16 UTC) |
| 18,000 ft FL180 | 220° at 29 kt | +2 kt | -13 °C | 118 kt | 12 h 39 min | 7:16 pm CDT (00:16 UTC) |
| 24,000 ft FL240 | 230° at 37 kt | −5 kt | -22 °C | 125 kt | 11 h 57 min | 6:34 pm CDT (23:34 UTC) |
| 30,000 ft FL300 | 230° at 48 kt | −9 kt | -31 °C | 129 kt | 11 h 34 min | 6:11 pm CDT (23:11 UTC) |
| 34,000 ft FL340 | 240° at 48 kt | −15 kt | -36 °C | 135 kt | 11 h 04 min | 5:41 pm CDT (22:41 UTC) |
| 39,000 ft FL390 | 240° at 44 kt | −14 kt | -45 °C | 134 kt | 11 h 09 min | 5:46 pm CDT (22:46 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 |
|---|---|---|---|---|---|---|---|---|---|---|
| SEA | used from 0 nm out; 25 nm from the line | 350/5 | 010/6 0° | 010/9 -4° | 010/27 -6° | 010/51 -15° | 360/58 -26° | 360/60 -41° | 350/55 -48° | 340/30 -45° |
| YKM | used from 50 nm out; 16 nm from the line | 360/6 | 360/11 -1° | 030/20 -7° | 040/21 -11° | 020/55 -18° | 010/84 -26° | 010/79 -40° | 010/45 -42° | 350/23 -42° |
| LWS | used from 149 nm out; 81 nm from the line | L/V | 340/5 -3° | L/V -6° | 040/7 -10° | 100/23 -22° | 180/30 -31° | 190/11 -34° | 200/11 -36° | 220/23 -40° |
| BOI | used from 249 nm out; 84 nm from the line | 320/11 1° | 280/8 -5° | 220/14 -11° | 200/60 -19° | 190/66 -31° | 210/46 -32° | 220/50 -33° | 220/43 -39° | |
| PIH | used from 398 nm out; 72 nm from the line | 070/8 | 150/19 1° | 180/32 -4° | 210/44 -17° | 210/37 -28° | 210/74 -31° | 220/68 -35° | 220/60 -43° | |
| SLC | used from 547 nm out; 64 nm from the line | 200/16 | 210/23 4° | 220/34 -3° | 210/40 -16° | 220/66 -23° | 220/64 -31° | 220/57 -36° | 220/50 -43° | |
| RKS | used from 647 nm out; 63 nm from the line | 250/9 | 230/21 -1° | 210/43 -14° | 220/59 -23° | 220/55 -32° | 220/53 -35° | 220/48 -44° | ||
| GJT | used from 697 nm out; 67 nm from the line | 220/26 6° | 230/39 0° | 220/55 -13° | 230/60 -23° | 230/78 -31° | 230/80 -35° | 230/74 -44° | ||
| ALS | used from 846 nm out; 73 nm from the line | 240/35 3° | 230/54 -9° | 240/66 -19° | 230/85 -26° | 240/87 -34° | 240/70 -47° | |||
| TCC | used from 1045 nm out; 60 nm from the line | 240/20 | 230/22 13° | 230/27 6° | 230/40 -7° | 240/55 -18° | 240/74 -27° | 240/68 -37° | 250/64 -49° | |
| AMA | used from 1144 nm out; 28 nm from the line | 230/32 | 230/28 14° | 230/27 7° | 230/38 -6° | 230/50 -17° | 250/69 -28° | 260/62 -37° | 270/65 -49° | |
| LBB | used from 1194 nm out; 48 nm from the line | 220/25 21° | 230/20 15° | 220/20 7° | 230/36 -6° | 240/50 -15° | 240/59 -28° | 260/52 -37° | 260/45 -50° | |
| ABI | used from 1294 nm out; 53 nm from the line | 200/30 19° | 220/12 16° | 220/11 9° | 230/15 -5° | 250/26 -15° | 250/39 -28° | 270/36 -38° | 280/30 -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 | no report just now | 432 ft | ||||
| YKM Yakima, WA | 90 nm out, 5 nm southwest of the line, tower | no report just now | 1,098 ft | ||||
| PDT Pendleton, OR | 179 nm out, 8 nm southwest of the line, tower | no report just now | 1,494 ft | ||||
| SUN Hailey, ID | 408 nm out, 4 nm east of the line, tower | no report just now | 5,319 ft | ||||
| PIH Pocatello, ID | 488 nm out, 21 nm northeast of the line, tower | no report just now | 4,451 ft | ||||
| VEL Vernal, UT | 697 nm out, 4 nm west of the line | no report just now | 5,274 ft | ||||
| ASE Aspen, CO | 836 nm out, 25 nm northeast of the line, tower | no report just now | 7,837 ft | ||||
| RTN Raton, NM | 1015 nm out, 6 nm southwest of the line | no report just now | 6,352 ft | ||||
| HRX Hereford, TX | 1174 nm out, 11 nm southwest of the line | no report just now | 3,787 ft | ||||
| PVW Plainview, TX | 1224 nm out, 18 nm southwest of the line | no report just now | 3,374 ft | ||||
| ABI Abilene, TX | 1373 nm out, 16 nm southwest of the line, tower | no report just now | 1,790 ft | ||||
| GRK Fort Hood (Killeen), TX | destination | no report just now | 1,015 ft |
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, 5:41 pm CDT (22:41 UTC)
GRK has no terminal forecast; use the nearest airport that does.
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 6:25 pm PDT (01:25 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: Seattle-Tacoma International, Robert Gray Army Airfield.