Robert Gray Army Airfield to Seattle-Tacoma International GRK → SEA
1,493 nautical miles (1,718 statute miles) northwest on a straight line, true course 318°, about 314° magnetic at the departure end (variation 4E). At 120 knots that is 11 h 51 min at the quickest height in today's winds (4,500 ft, a 6-knot tailwind), arriving about 7:32 am PDT (14:32 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 6W: thunderstorms (a convective SIGMET) up to 34,000 ft, moving from the southwest at 40 knots, until 10:55 pm CDT (03:55 UTC). Over the route from 438 to 627 nm out.
as issued
WSUS33 KKCI 120155 MKCW WST 120155 CONVECTIVE SIGMET 6W VALID UNTIL 0355Z CO NM FROM 50SSW DEN-30NNE TBE-50SSW CME-50E SJN-20NE DVC-50SSW DEN AREA TS MOV FROM 23040KT. TOPS TO FL340.
- AIRMET TANGO 4W: moderate turbulence below 18,000 ft up to 18,000 ft. Over the route from 408 to 935 nm out.
- AIRMET TANGO 2W: moderate turbulence above 18,000 ft from 35,000 ft to 45,000 ft. Near the route, 448 nm along the route.
- AIRMET TANGO 4W: moderate turbulence above 18,000 ft from 18,000 ft to 36,000 ft. Over the route from 478 to 1184 nm out.
- AIRMET SIERRA 1E: mountains obscured by cloud (due to mountains obscured by clouds, precipitation, mist). Over the route from 527 to 657 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 557 to 856 nm out.
- AIRMET ZULU 3C: moderate icing up to 22,000 ft. Over the route from 736 to 1164 nm out.
- AIRMET SIERRA 1E: mountains obscured by cloud (due to mountains obscured by clouds, precipitation, mist). Over the route from 746 to 1324 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 756 to 806 nm out.
- AIRMET SIERRA 2E: low cloud or poor visibility (IFR conditions) (due to ceilings below 1,000 ft, visibility below 3 miles, precipitation, mist). Over the route from 816 to 846 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 935 to 1115 nm out.
- AIRMET ZULU 2C: moderate icing up to 16,000 ft. Over the route from 1244 to 1393 nm out.
- AIRMET TANGO 1W: moderate turbulence above 18,000 ft from 18,000 ft to 39,000 ft. Over the last 139 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 GRK.
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 02:00–09:00 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 13 forecast points nearest it (ABI, LBB, AMA, TCC, ALS, GJT, RKS, SLC, PIH, BOI, LWS, YKM, SEA). 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 | 200° at 13 kt | −6 kt | 12 °C | 126 kt | 11 h 51 min | 7:32 am PDT (14:32 UTC) |
| 6,500 ft | 210° at 12 kt | −5 kt | 7 °C | 125 kt | 11 h 57 min | 7:38 am PDT (14:38 UTC) |
| 8,500 ft | 220° at 14 kt | −2 kt | 4 °C | 122 kt | 12 h 14 min | 7:55 am PDT (14:55 UTC) |
| 10,500 ft | 230° at 18 kt | +1 kt | 2 °C | 119 kt | 12 h 33 min | 8:14 am PDT (15:14 UTC) |
| 12,500 ft | 230° at 19 kt | +2 kt | -1 °C | 118 kt | 12 h 39 min | 8:20 am PDT (15:20 UTC) |
| 14,500 ft | 230° at 23 kt | 0 | -5 °C | 120 kt | 12 h 26 min | 8:07 am PDT (15:07 UTC) |
| 16,500 ft | 220° at 26 kt | −1 kt | -9 °C | 121 kt | 12 h 20 min | 8:01 am PDT (15:01 UTC) |
| 18,000 ft FL180 | 220° at 29 kt | −2 kt | -12 °C | 122 kt | 12 h 14 min | 7:55 am PDT (14:55 UTC) |
| 24,000 ft FL240 | 220° at 37 kt | −1 kt | -23 °C | 121 kt | 12 h 20 min | 8:01 am PDT (15:01 UTC) |
| 30,000 ft FL300 | 230° at 46 kt | +9 kt | -30 °C | 111 kt | 13 h 27 min | 9:08 am PDT (16:08 UTC) |
| 34,000 ft FL340 | 240° at 46 kt | +13 kt | -36 °C | 107 kt | 13 h 57 min | 9:38 am PDT (16:38 UTC) |
| 39,000 ft FL390 | 240° at 42 kt | +12 kt | -45 °C | 108 kt | 13 h 49 min | 9:30 am PDT (16:30 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 |
|---|---|---|---|---|---|---|---|---|---|---|
| ABI | used from 0 nm out; 100 nm from the line | 200/31 17° | 210/21 15° | 240/15 9° | 250/14 -4° | 250/24 -14° | 250/36 -28° | 270/35 -38° | 290/41 -50° | |
| LBB | used from 199 nm out; 51 nm from the line | 200/36 18° | 220/19 15° | 240/20 8° | 230/24 -4° | 240/37 -16° | 250/57 -28° | 250/51 -38° | 270/47 -50° | |
| AMA | used from 299 nm out; 28 nm from the line | 210/38 | 230/29 14° | 240/29 7° | 220/27 -5° | 240/37 -18° | 240/66 -28° | 250/59 -37° | 260/47 -49° | |
| TCC | used from 348 nm out; 42 nm from the line | 210/42 | 230/33 14° | 230/32 6° | 220/35 -6° | 230/49 -19° | 240/72 -27° | 250/62 -36° | 250/52 -48° | |
| ALS | used from 448 nm out; 82 nm from the line | 230/37 4° | 220/54 -9° | 230/62 -22° | 240/77 -26° | 240/74 -33° | 230/59 -45° | |||
| GJT | used from 647 nm out; 52 nm from the line | 210/43 7° | 230/45 1° | 220/49 -12° | 220/62 -22° | 220/59 -28° | 230/60 -33° | 220/55 -45° | ||
| RKS | used from 796 nm out; 63 nm from the line | 200/41 | 220/44 1° | 220/35 -11° | 220/46 -24° | 210/53 -27° | 220/62 -35° | 230/61 -44° | ||
| SLC | used from 846 nm out; 66 nm from the line | 200/5 | 230/8 2° | 220/20 -2° | 210/40 -12° | 190/53 -25° | 210/62 -30° | 220/69 -34° | 220/64 -43° | |
| PIH | used from 945 nm out; 36 nm from the line | L/V | 240/13 1° | 240/15 -3° | 210/42 -15° | 200/70 -25° | 220/74 -29° | 220/71 -36° | 220/62 -43° | |
| BOI | used from 1095 nm out; 55 nm from the line | 300/7 2° | 280/5 -4° | 210/16 -9° | 210/60 -20° | 210/75 -29° | 210/63 -32° | 220/64 -32° | 220/54 -39° | |
| LWS | used from 1244 nm out; 70 nm from the line | 070/10 | 080/12 -2° | 030/12 -6° | 080/7 -10° | 170/34 -21° | 160/46 -32° | 200/33 -35° | 220/22 -35° | 230/18 -38° |
| YKM | used from 1343 nm out; 35 nm from the line | 070/10 | 040/15 -1° | 020/27 -8° | 030/25 -13° | 020/48 -20° | 010/83 -27° | 010/77 -37° | 010/49 -40° | 350/14 -41° |
| SEA | used from 1443 nm out; 25 nm from the line | 050/7 | 050/11 1° | 050/12 -5° | 030/31 -7° | 010/61 -15° | 010/69 -26° | 360/73 -40° | 360/62 -47° | 330/21 -43° |
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 |
|---|---|---|---|---|---|---|---|
| GRK Fort Hood (Killeen), TX | departure | no report just now | 1,015 ft | ||||
| ABI Abilene, TX | 119 nm out, 16 nm southwest of the line, tower | no report just now | 1,790 ft | ||||
| PVW Plainview, TX | 269 nm out, 18 nm southwest of the line | no report just now | 3,374 ft | ||||
| HRX Hereford, TX | 318 nm out, 11 nm southwest of the line | no report just now | 3,787 ft | ||||
| RTN Raton, NM | 478 nm out, 6 nm southwest of the line | no report just now | 6,352 ft | ||||
| ASE Aspen, CO | 657 nm out, 25 nm northeast of the line, tower | no report just now | 7,837 ft | ||||
| VEL Vernal, UT | 796 nm out, 4 nm west of the line | no report just now | 5,274 ft | ||||
| PIH Pocatello, ID | 1005 nm out, 21 nm northeast of the line, tower | no report just now | 4,451 ft | ||||
| SUN Hailey, ID | 1085 nm out, 4 nm east of the line, tower | no report just now | 5,319 ft | ||||
| PDT Pendleton, OR | 1314 nm out, 8 nm southwest of the line, tower | no report just now | 1,494 ft | ||||
| YKM Yakima, WA | 1403 nm out, 5 nm southwest of the line, tower | no report just now | 1,098 ft | ||||
| SEA Seattle, WA | destination | no report just now | 432 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 SEA when you get there the forecast at the estimated arrival, 7:32 am PDT (14:32 UTC)
SEA 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 GRK 7:03 pm CDT (00:03 UTC), at SEA 6:27 pm PDT (01:27 UTC) (civil twilight ends 6:58 pm PDT (01:58 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: Robert Gray Army Airfield, Seattle-Tacoma International.