Seattle-Tacoma International to Yampa Valley Airport SEA → HDN
773 nautical miles (889 statute miles) southeast on a straight line, true course 117°, about 101° magnetic at the departure end (variation 16E). At 120 knots that is 5 h 36 min at the quickest height in today's winds (39,000 ft, a 18-knot tailwind), arriving about 12:41 am MDT (06:41 UTC), after sunset at the destination. 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: 85 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 119 to 307 nm out.
- AIRMET SIERRA 1E: mountains obscured by cloud (due to mountains obscured by clouds, precipitation, mist). Over the last 604 nm of the route.
- AIRMET TANGO 4W: moderate turbulence above 18,000 ft from 18,000 ft to 36,000 ft. Over the last 515 nm of the route.
- 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 347 to 545 nm out.
- AIRMET ZULU 3C: moderate icing up to 22,000 ft. Over the route from 377 to 654 nm out.
- AIRMET TANGO 4W: moderate turbulence below 18,000 ft up to 18,000 ft. Over the last 258 nm of the route.
- 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 last 238 nm of the route.
- AIRMET TANGO 5W: strong surface winds (30 knots or more) (due to sustained surface winds greater than 30 knots). Over the route from 674 to 733 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 6 forecast points nearest it (SEA, YKM, LWS, BOI, PIH, RKS). 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 | 350° at 8 kt | −5 kt | 4 °C | 125 kt | 6 h 11 min | 1:16 am MDT (07:16 UTC) |
| 7,500 ft | 210° at 5 kt | +1 kt | -3 °C | 119 kt | 6 h 30 min | 1:35 am MDT (07:35 UTC) |
| 9,500 ft | 210° at 7 kt | +2 kt | -4 °C | 118 kt | 6 h 33 min | 1:38 am MDT (07:38 UTC) |
| 11,500 ft | 210° at 16 kt | +3 kt | -7 °C | 117 kt | 6 h 36 min | 1:41 am MDT (07:41 UTC) |
| 13,500 ft | 210° at 21 kt | +4 kt | -8 °C | 116 kt | 6 h 40 min | 1:45 am MDT (07:45 UTC) |
| 15,500 ft | 210° at 24 kt | +5 kt | -11 °C | 115 kt | 6 h 43 min | 1:48 am MDT (07:48 UTC) |
| 17,500 ft | 200° at 28 kt | +6 kt | -15 °C | 114 kt | 6 h 47 min | 1:52 am MDT (07:52 UTC) |
| 18,000 ft FL180 | 200° at 29 kt | +6 kt | -16 °C | 114 kt | 6 h 47 min | 1:52 am MDT (07:52 UTC) |
| 24,000 ft FL240 | 210° at 30 kt | +3 kt | -25 °C | 117 kt | 6 h 36 min | 1:41 am MDT (07:41 UTC) |
| 30,000 ft FL300 | 210° at 34 kt | +4 kt | -34 °C | 116 kt | 6 h 40 min | 1:45 am MDT (07:45 UTC) |
| 34,000 ft FL340 | 230° at 44 kt | −8 kt | -37 °C | 128 kt | 6 h 02 min | 1:07 am MDT (07:07 UTC) |
| 39,000 ft FL390 | 240° at 49 kt | −18 kt | -43 °C | 138 kt | 5 h 36 min | 12:41 am MDT (06:41 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; 19 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; 69 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 297 nm out; 78 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 396 nm out; 75 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° | |
| RKS | used from 595 nm out; 47 nm from the line | 190/43 | 210/65 3° | 210/57 -9° | 210/56 -21° | 210/47 -33° | 230/63 -37° | 240/77 -46° |
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 | ||||
| ESW Easton, WA | 50 nm out, 11 nm north of the line | no report just now | 2,226 ft | ||||
| PSC Pasco, WA | 149 nm out, 1 nm southeast of the line, tower | no report just now | 410 ft | ||||
| ALW Walla Walla, WA | 188 nm out, 9 nm north of the line, tower | no report just now | 1,194 ft | ||||
| MYL Mc Call, ID | 297 nm out, 7 nm south of the line | no report just now | 5,024 ft | ||||
| LLJ Challis, ID | 377 nm out, 18 nm northeast of the line | no report just now | 5,075 ft | ||||
| AOC Arco, ID | 446 nm out, 8 nm southwest of the line | no report just now | 5,334 ft | ||||
| IDA Idaho Falls, ID | 495 nm out, 20 nm north of the line, tower | no report just now | 4,743 ft | ||||
| AFO Afton, WY | 555 nm out, 9 nm northeast of the line | no report just now | 6,220 ft | ||||
| RKS Rock Springs, WY | 664 nm out, 3 nm east of the line | no report just now | 6,764 ft | ||||
| DWX Dixon, WY | 743 nm out, 19 nm northeast of the line | no report just now | 6,548 ft | ||||
| HDN Hayden, CO | destination | no report just now | 6,606 ft |
The highest airport on this list sits at 6,764 ft; the ground between airports is higher still. Check the sectional chart for the terrain and the minimum safe heights along the line.
At HDN when you get there the forecast at the estimated arrival, 12:41 am MDT (06:41 UTC)
HDN 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 6:27 pm PDT (01:27 UTC), at HDN 6:33 pm MDT (00:33 UTC) (civil twilight ends 7:01 pm MDT (01:01 UTC)). At 120 knots the arrival at HDN is before sunrise there (7:16 am MDT (13:16 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, Yampa Valley Airport.